Last
setting with
day:22/03/2008
Creation date: 28/01/2003
Source of this page:
http://yves.maguer.free.fr/WiFi/page_wifi_yves.html
With
translation to any language is
possible young stag
Year English translation one 22/03/2008
I make studies of radio
links
(mesh
possible) or of
covers WiFi or WiMax.to Voir
my CV.
My rural partner: Numevia
My
town partner (hotspots): Coffeespot
Me consulter:
(to remove
_POURIEL of the email).
If one day, you succeeded in reading
all this
page (cheer!),
capitalize your effort, and read then only them
differences!
Software exists:
HTMLDiff
(google is my friend, “keygen” also)(I want to pay 1
euro by utility, not more).
HTMLCompare
My page seems to be censured in China.
Pour Toulousains
it is by here with a proposal of réseau
with a grid.
Description of the problem to be
solved,
resulting from the true life, I quote:
“Madam, Sir,
I live in a small hamlet (place says
Mouillecrotte) which
depends on the commune of BRESTOT in the Eure.
I also live to 9 km of the DSLAM of
which I
depend
and with 80dB I am not eligible with the ADSL.
I live to 11 km of an antennaWIMAXet
I thus made make on
site a test of eligibility with the WIMAX (currently
deployed in the Eure by Altitude TELECOM for
“to cover”
white areas of the ADSL)… which is
revealed
negative (I live in skirt of forest
and am not
thus not in visu direct with this antenna WIMAX).
In short I live where high banc
is not available!
Please help me!
Cordially "
Here “Gruyere of
high banc” ADSL
(for Loiret) and I place in lower part the establishment of WiMax byMedialys
Interesting, not? WiFi, it, go there or people want it.
Message
for the happy holders of licensesWiMaxà
1
euro (les
areas: Aquitaine, Alsace,
Bourgogne,
Brittany,
Corsica, Poitou-Charentes
I
invite you
to stipulate
obligation with the owner of the license, with
to authorize
its customers to resell their access, according to a price
defined by them, the customers.
Pourquoi?
Ben, au
case or WiMax would disappoint, one can play the chart
(!) complementarity
(include/understand WiMax+WiFi).
Why I say that? Because a pylone WiMax is sold 90.000
euros. I speak just about
installation, not of refunding
recurring of the licenses, which will fix, in the long term, it
price of
the subscription for the final customer.
The known as areas
will be able to take part,
admittedly, but how long?
«Nous
suffered from a deficit of the suppliers ADSL who did not cover
sufficient our rural areas, they was satisfied with the big cities.
The Wi-Fi/WiMAX couple really was essential like the technical solution
best adapted »,
explain
Dominique Randon.
Prudence is of setting:
“Them
misant WiMax operators
on the rural areas of the markets
developed will expose themselves to
low registers
difficulties as services DSL
will take a lead in these territories. “
Will FT
“encircle” the WiMAX pylons?
"We knew
that would fall to water. But
nobody could
to allow not
to follow the doctrinaire approach"
All goes
very well, madâÂâme
Marchioness….it was in 2002!!!!
WiMax France
(2007): “Le
parcelling out of the licences does not allow one
operator
to reach a sufficient critical mass to be profitable."
Le
WiMax functions well (3Km of range downtown) with 2.5GHz
...... forgiveness, but I glousse!!! (that
resembles too much of WiFi, Mort Of Laughing).
“Even if it is
initially used for
the installation of
territory,le
principal market of Wimax is the cities", a
however
estimated Jean-Paul Rivière (Altitude Telecom). Indeed, Jean-Paul: “A
to start from this pivotal year [2010], incomes
will cease growing bigger, to reach 23 billion dollars in 2013".
Lastly, they are only
forecasts (12/2007).
L'
intervention
des
local government agencies in
telecommunications.
Report of work of the Committee of the Networks
of Public Initiative. March 15, 2007.
WiFi against WiMAX according to Intel
And
to say
that there is (still) qui
of it
croient in WiMAX as rural solution!! They will have
perhaps reasonen
2013, if Altitude Telecom poses
indeed
3500 WiMax stations
Tiens! one
tells me ici (minute 52) qu'
one needs 10.000 stations to cover France….I can in
to conclude that Altitude Telecom
will not solve
digital divide with WiMax???
En Ukraine: " [] shows the
viability of
the use of BreezeMAX 3500 in the service road ofzones
urban very
populated"
En
Germany, Les purchasing [of licenses
WiMAX] engaged
to ensurecouverture
of 25 _ of the communesde their zones
from here
with2011
I put myself a question about mobile
WiMAX (802.16e); how
not vider
quickly la batteriede
the mobile device (considering the power of emission
necessary)?
La
radio coverage is better of 20 _ into 2,5 GHz than into 3,5 GHzInclude/understand 20 _ better in WiFi than in
WiMAX, for France.Couvrir
of the zones of not very dense habitat in
Mobile WiMAX with 3,5 GHz will be thusplutôt
expensive.
Pessimistic vision of Pierre Beaufils
[Greenwich Consulting] on l'
future of WiMax
“When well even the flow of
the 3G would not be enough, simplest
remain to connect itself to a Wi-Fi network whose access is in general
free or integrated into the mobile offers of the operators. Moreover, Wimax
still involve big problems as regards consumption
electric, which reduces the autonomy of a portable. A problem that
does not know the 3G which proposes a better management of the battery.
“
WiMAX:
assessment of an experimentation in rural area (Country of the Valleys
of Saintonge) in January 2006.
If WiMax does not go, there will be
always WiFi:
La
France puts itself at the “mesh”.
“What one less knows about
Wi-Fi, [...], it is that it
allows point-to-point connections in line of sight bordering
les10 kilometers
thanks to the antennas with profit " (source
Pierre-Antoine Baubion)
(I confirm, I did it. With
100mW (in
the air), 10Km is the high limit.). The
configuration which I have
used was: An access point (AP)
normal
with the emission and a large antenna with
la
reception.
This means that it becomes possible to
collect a AP well
beyond its coverage area for portable PC or
PDA.
They is the Parisian ones which will be
content, grace
with400
hotspots installed from here the end of June 2007!
The world records are of 200Km
with 300mW in the cable (=25dBm) (it is not thus pas
3 times more than 100mW in the air, but much more), which
fact a power in the air (WORSE) of 48Watts!! in France us
naps limited to….100mW,
i.e. 480
time less. (source
Le
record passes to382Km(18/05/2007)
with large antennas:
And with304Km
in 5GHz (802.11a) ., between Sardinia and Italy.
Voici des vidéos
ofFrance3on
WiFi installations for
to serve “isolated” villages.
To bring Internet to those
which do not have the ADSL:
The large ones
networks…
A company (Alsatis)
vous
allows
to equip in WiFi.
Nomotech
équipe
la
Normandy in WiFi, by using fiberoptic and
beams herziens.
Un mariage
fibre and WiFi (rather than WiMax) in the Rhone.
And of small
networks…
Rural WiFi is in evolution, here
solutions which
function:
A Viviers-lès-LavaurFrançois
Laperruque used one
mesh network withOLSR(comparable
withOSPF)
and freifunksite
in
Germanbinaires
A Saint
CerninSylvain
Lacaze used the infrastructure mode withWDS
A Vaours
Didier Lebrun
diffuse Internet in WiFi, via
the satellite
since 2003. Didier uses 4 ADSL bonds today,
since it coupled its network with that
duplateau
Cordais, as one can see it on this
splendid chart, in time
reality.
In Villeneuve-Tolosanne, Marc Quinton
with used
OLSR and soundpropre
firmware here a vue
satellite with the bonds
A VerdonPatrice
Valade
cross the valley of the Dordogne to bring it
high-flow (in
WDS) in a zone “whiter than white”.
Au Mayet
of Montagne,
Dominique proposes the subscription with20
euros/monthLa
chart of cover of its network.
A Tamniès,
Richard Bonnaffoux, propagates his networkde
relay out of relay
A Plougonven,
Marc replaced his satellite connection by oneligne
Symmetrical France Telecom with
flow guarantees. (SDSL,
2Mb/s).
A let us Trébons
on the fatty one, Jean
and Robertont makes their network which serves 25
hearths (07/2006).
With Catllar and Los Masos, l'
association
WiFi Conflenttraverse the valley of the Small fireclay cup
to deliver
Internet free, with a mesh network
composed of “Locusworld
“house”.
A Saint
Bresson, a chart of the network, provided byPascal
from Montpellier(Quand
the townsmen give the hand to the rural ones
Mode WDS is used to make pass the bytes
of
network of a point
WiFi access to another.
One can thus relay the WiFi network on
the long ones
distances
and to benefit from the WiFi network at each point
access.
Voici un
access point the commercial, which allows this function WDS.
(80euros,
06/2006)
The difference with a repeater, is
that the repeater
allows to relay that only one apparatus WiFi (only one channel,
the distant MAC address is repeated).
La list
RAN (Rural Area
Network) gathers this kind of initiatives.
One has sympathetic meetings:Rencontre
of spring RAN 27
and May 28, 2006
with TAMNIES
To
put faces on
names, voici
a photograph of
group
Among the last meetings, there was:Rencontres
wifi
23 and September 24, 2006 in the Verdon
The last meeting was it
samedi
March 31 and Sunday April 1, 2007 with the Printemps
Wi-Fi 2007in Auvergne
Here
< C 0 > Report de these enriching and sympathetic nerves
days.
Creation
S.O.L:LE
TRADE UNION
LOCAUX OPERATORS
Panorama
solutions [CPL, WiFi, WiMAX, 3G (GSM), satellite] by
01net.
Solutions carried out by professionals:
In
Ardeche
Du WiFi
with a grid in Gordes in Luberon.
A Borce
and Etsaut, they use a mixture of CPL (30MHz
max) and
WiFi to prolong a satellite solution.
Le CPL
" outdoor "
(of the meter towards EDF) and “indoor”
(of the comptor
towards the catches sectorest
in the course of normalisation (10/2005).
However the CPL could scramble the band
AM as that seems
to be the case with the U.S. (vidéo
of 18Mo, in English).
On parle de EDFbox
and edfbox.fr
Typically, on a zone or there are 350
NRA (connection ADSL), it
is necessary to equip 10.000 transformers EDF (à
3000 euro each one), for distribuer
CPLaux same subscribers. Moreover, it is necessary to place one
repeater CPL at the end of a few hundreds of
meters to preserve a flow
raised.
In addition, it would seem
that the steps
administrative
are long;1 an,
before the implementation (03/2007).
If France Telecom (FT) wants to makecernage (to install
not-profitable high-flow to kill competition) on
each
network, they will have to spend of the thousands
euros for each more quoted WiFi network
high… pffff….: -)
“France telecom wants to make
of Wi-Fi on the commune of 300
inhabitants orj'
have
deployed
my transmitters!!!! “known as Dominique.
When I see that FT establishes
concurrent solutions (in WiFi)
precisely there or of the microphone-operators (see list
RAN) try
to survive, whereas there is place with
side to désservir
those which do not have an access Internet high banc,
I am only
fairly astonished by the absence of FT in Wimax
on the metropolis.
The ARCEP me surprised
ace!.ouiap, does it of it
is FT
who is not interested in this market…
officially… for
to make good figure.
Saint Cernin and Viviers are already
encircled. FT even
encircles
maintaining communesavant
que the material is operational.
Example:
Wifi-quercy-south. Ca
wants to say that you only have
very
little money to spend to make you encircle
(to declare one
association aiming at installing of WiFi
mutualized) (more you
you make known, more you will be encircled quickly).
Super
not? :-)
During this time, FT puts WiFi
more
rentable in the cities. They
are not only… “Visiblement,
Sprint intends to aim at the market of the nomadism".
FT sold a contract withcertains
departments so that the distributors of their communes are
equipped in
high-flow before 2006.
It is the charter of the departmentsisolants
innovating.
One is there; made the assessment.
But what some did not
include/understand, it is that it acts
to only equipceux
which to peuventavoir the ADSL, therefore is
excluded, the private individuals (or companies) who are too far from
distributor
!! (environ
8 _ of the population) Then in the statistics, guess
how one counts? and well on
count the communes equipped, and of
ceux blow which is too
moved away from the distributor, pass tooubliettes
At the end of 2007, it will remain 620
000 Net surfers on the edge of the motorway of information (99_
covered population)
Me would have been lied? according to this source
(HDRR) who relates to 11 areas there would be 800
thousand
people concerned (in 2006!), which would make 1.600.000
people for France (22 areas).
The deficiency relates to also
the TPE
(Very Small companies) “un millionne is evenpas connectedà
Internet " (12/2007).
Still a detail concerningdébit WiFi
in shift:
If you wait until new materials
(bringing more
of flow)
appear to equip you, I think that you
mislead
a little, here why:
There are 2 types of connections
The first are done at short
distances,
thus for
theoretical outputs
raised. But because of
reflexions,
these flows are less. Evolutions
technological
current tend to erase this handicap (see MIMO,
increase
number of antennas). "Les débits
realitiesoscillent between 40 and 50 Mbit/s
inside the buildings and
they exceed briskly100
Mbit/s in space
opened"(04/2007)
The seconds will thus not benefit from
technologies aiming
with
to mitigate the effect of the echoes.
In addition, it seems rather difficult
to me to install 3 (or 7)
antennas, there or there is one of them today.
The current flows obtained in shift, are
likely to return
le
current material perennial than that of the cities.
In conclusion, it is maintenant
qu' it is necessary to invest on
installations of countryside.
Quand le débit
cities (FTTB or FTTH) will be larger,
it will be enough to change - not antennas - but the boitiers
(connected to the antennas) to convey the flows
futures.
The cost of the evolution
will be thus minor.
Le FTTA
(100Mb/s in 42GHz) is an abuse language, its
range (3Km) is very reduced by
report/ratio in WiFi.
I seek to know if one can make
a waiter
of authentification which is not centralized; if you have
des
brief replies,vous can
to write to me
(to remove _POURIEL email).
to Voir
the bonds which leave this page
Or are my readers:
Testez
your débit
in the 2 directions
Presentation
Why
this page?
That is
it
what it is WiFi?
Why
one speaks about it now?
Why
gradually legal in France?
WiFi
for what
to make?
Which
are the competitors of WiFi (2.4GHz/11Mbit/s)?
Swelled,
Is MHz, Mb/s it what?
Which
is the bond between flow in bit/s and bytes
transferred?
Which
are the various standards of WiFi?
Waves
Y' has
what has to take that which goes most quickly?
Why
y' has 2 antennas on the AP?
Yes,
but all that they is assumptions?
How
to take the control of its material via Ethernet (RJ45 or
WiFi)
since a PC?
With
what is used for to take the control of its material?
How
to know if a WiFi connection will go, without material?
How
to implement the software “Radio operator Mobile”?
Y
does it have ancestors of WiFi in France?
Which
is the price of the material to date?
How
a link long distance is established?
How
one takes omnidirectional a step expensive?
That is
what can scramble us and which scrambles one?
How
to do without the electric cable until the AP?
Then
what to make? 4 solutions
Which
solution to choose?
Network
C' is
what a hub (repeater),
a switch, a bridge (bridge),
a router?
How
to choose between fixed or re-used address IP?
Who
buy
IP addresses?
Addresses
MAC, addresses IP re-used, how that
goes?
Not
of waiter DHCP on a bit?
The address
Can IP, it be unspecified?
It is
what a mask of sub-network (“subnet mask”)?
How
to identify the computer which is connected to Internet?
To have
is an address IP, that enough?
Les
Can AP go on the roofs without problem?
Technique
Les
is waves they bad for health?
How
to detect the radio waves?
How
to put a mini-NCV in a satellite toshiba?
How
to add a connector on D-LINK DWL-650+?
With
WiFi is what I would be
pirated?
How
to improve a WiFi connection?
One can
to make a bad antenna “ricoré”?
It
there T it has reflectors on the antennas grids SD27?
Why
my compass does not work
well?
But
the lightning?
My
antennas are well
granted?
Le
Does WiFi, that grow bigger well?
How to
find itself there in
connectors?
How
to choose the cables?
End of
a myth on WiFi, them
walls, them
doors and windows?
Who
will gain, the pair
coppered (the wire of the telephone)
or the radio?
Which
is the form of
radiation
of an antenna?
How
to circumvent
an obstacle?
Pourquoi this page? to synthesize and solidify information data by forums, the press, the Web, my courses, my experiments, it good direction.
WiFi is means of communication by radio waves enters computers (in the broad sense). From a software point of view, it is the equivalent of a LAN (network) of company.
The protocol used is pressed on Ethernet and allows to make to pass protocol IP (Internet Protocol).
Because that becomes gradually
legal in France. It
was necessary initially that Jospin authorizes the radio communications
encrypted (with 40 bits with
the time) above the public domain.
It was then necessary to
legislate (withARTou
ARCEP) on the authorized power, for not
to obstruct the Army
Frenchwoman (the ministry for
defense), former owner
frequency.
And then in the USA and in the other
countries of Europe, it is
already legal,
and the sales progress.
Why gradually legal in France?
Because this technology can concurrencer
Telecom France, at the time or this one would occur (sentence
from there
timeless).
ART defends France Telecom:
“One gives
satisfaction with
France Telecom immediately with
detriment of the subscribers and one
push back with later the decisions in favour of
competition "selon
Jacques Veyrat
The limit in power relates to the sortie
antennes,
what is still très
restrictive for point-to-point bonds (by
opposition to bonds makes with an antenna
omnidirectional).
By definition the
point-to-point bonds cannot
to scramble that
very little world since the waves are
focused towards
the other point. Legislation
U.S. (or Canadian) holds some
count, it is more tolerant for the bonds not
at point.
ART wishes to study themliaisons
point-to-point (thus supérieures
with 100mW) on a case-by-case basis:
“The operator who wishes to
deploy connections
not with
not, withportées
noncompatible with the limitations of
powerindiquées in the tables, must
to solicit with this
effect near the Authorityune
autorisationd' use of frequencies "
It should be noted that liaisons
point-to-point WiFi, with less
100mW of PIRE,
can be made on6
with 8Km, contrary
with the assertions of the ART, which envisaged 1Km. Voir comment ici .
On the other hand, if you modifiez
the antenne (to put one of them more
powerful) of your WiFi material, without modifying
(to program)
power of the apparatus (to lower it),votre
installation becomes illegal. Ne
do not count on the scruples or competences of
salesmen of
material, for you to prevent some.
In March 2005, and to my knowledge
(which is
limited), itminimum
of programmable power is of approximately 0dBm. For information, 0dBm
corresponds to1mWThe dBm can be negative, not Watts.
The limitations of power are
of 0.01
Watt with 0.1 Watt (according to the channels) exit antenna
for the 2.4
GHz in France.
In Canada, these limitations are of 4
Watts,
in
Germany of 500mWatts.Les
English (Ofcom),
evoke the possibility of authorizing10W,
it
who nuierait doubtless in Wimax!!! Me,
my opinion,
it is
that it is Paris which fixes the powers and which they is the rural
ones
who suffer from it….who spoke about
delocalizations???
Our English friends se
pose questions (robotized translation):
Thank you Dominique for
information.
In short, not of additional power in
2.4GHz because
interferences, to pass to 4W radiated in 5.8GHz
and limitation in the cable when Europe requires it.
The 5GHz (802.11a) is to dateinterditen
France for one
external use,mais
that could change.
Ben yes, that changed (02/2006), to see
thempuissances
authorized in fonction
of
frequencies.
Then I put myself the question: why the
ARCEP authorizes the 5GHz
with 1Watt or WiMax with 20Watts and WiFi
with 0.1Watt?
I am not the only one to ask me this
question:
" the needs for frequencies
increase. If us
let us continue to distribute them in an ineffective way,purement
administrative and on a base nationale,
the industry of the télécoms
will not take its take-off. One needs an approach which is inspired
more operation of the market ", souligne
with the daily newspaper Vivian Reding(police chief of the Commission
European as regards
télécoms)
I would even say “local
market”, ViVian, in
thinking
in Wifistes rural!
The study
of SagaTel for the ARCEP (2006)
Good, then let us positivons!!:
With
1W in 5GHz, which
range do we have?
...11Km,
by
report/ratio in WiFi 2.4GHz under the same conditions (8.55Kmnous let us have
gained….3Km!!
How that is it done? (if little?) Ben yes, with the increase in
frequency, the loss in the air passed from
-124dB
with -134dB.
We lost 10dB because of the frequency
and
gained 10dB with the power.
With antennas well in height (half
fresnel=0,12m of
release) one would have 24Km
Under these conditions (dégagement
of 23m), WiFi 2.4GHz would carry to17Km
<>Et then,
sometimes I do not resist
emulously of you
to make divide what makes me die laughter (MDR), like
this labsus inpharse
phrases concerning WiFi5 (802.11a, 5GHz):
“The Wimax material will be
intended foropératueurstélécoms
professional ". thank
you Dominique.
One speaks to me here
of WiFi with
60GHzto have
one
flow of 150Gb/s, super!
But which is its range by
improving them
antennas?
By considering that the sight is
direct (Fresnel with
0dB) one arrives at…500meters!!
thus unsuited to rural WiFi.
To use mon
utilitaireil is necessary to recoverle
run-time enginqui made 20méga.
If you seek “WiFi”
on the site of ART (ARCEP),
you find with the 05/08/2004, 47
articles,
no the synthèse
up to date.
Message personal for
the Prime Minister
Would be necessary to limit the power
of WiFi (100mW) at exit of
cable
of antenna rather than at exit of the antenna (WORSE).
Ca would enable us to use légalement
des
unidirectionnelles antennas
Sinon, la France
of in bottom
flow,
eh quite elle
will remain in bottom
In my opinion, it is better that work
is done in the Creuse
one
(nearshore) rather than in China or inInde
(offshore oil rig).
And now, that bears a name: homeshoring(telecommuting
in residence)(less
transport, less oil taxes… zut!).
I did not find in “small Larousse” of definition equivalent Radiated Isotropic Power (WORSE).
Then you known as “y' with the ADSL”, except that:
Dominique Bordered,
communications director of France
Telecom
for the Limousin, insists on profitability
necessary of
installations (DSLAM): “We should reach 80 to 100 customers
to hope to deaden over three years, the equipment
of a telephone centre
in ADSL. “ Knowing
that in rural area 8 _ subscribers
only are likely to take out a high subscription
flow,
calculations are quickly made:pas of connection for
communes of less than 2.000 inhabitantsIt is
moreover the threshold that the operator fixed itself
public. They were
32.079 with the last census " (on 36.000 communes in
France).
A colleague did not understand that
with 250 signatures, FT does not install a DSLAM. It is necessary to consider100 signatures in a ray of 3Km(as
the crow flies, which corresponds to 5Km of wire
telephone) so that the DSLAM of FT is profitable.
My remark with me, it is that one should not take des figures on the practices of yesterday, to predict the use technologies of tomorrow.
I point out les European texts:
"
Texts of the European commission- The recommendation of the European commission from March 20, 2003 inviting the Member States withfaciliter the utilisationdes hertzian lans (R-LAN, also called w-LAN andWi-Fi) for accéder at the public services
"
I do not invite you to read
them, because they are
fact for
to be read by those which write them, only.
For people
normal (like me), it is incomprehensible. Idem for the Constitition
European.
You attendez
Wimax(me I wait
to see the price of Wimax: 125
million euros(hold,
precisely, ART wants
to nauseate them
peasants (and telecommuters) because themlicenses
will be sold with the biddings (as for the UMTS)
thus only
the cities will be profitable).
Tiens, ils
opinions changed! :-)
Ô you, living deep France,
you does not expect
with it
that the operators of WiMax start with
to equip the zones
lesmoins
profitable in premier(you saw what it is
passed for
the ADSL, not?). "99
_ of the population " it is the objective, deep France
it is the 1 _ remaining. After
all, that only makes
600.000 voters… with
less than the townsmen appreciate the holidays with
the countryside?
Les
forgotten amount with nearly 4
million individuals
Let us note that on the 70
projetsde
communities
referred by Arcep,
that proposed bydépartement
the English Channel is le seulà
to have filled
the reduction objective of the digital divide.
“But even with Wimax,il will remain to reabsorb a residue of zone white " according to Jean-Daniel Poisson with TDF.
"WiMAX
is the true alternative to the last kilometer"...Ha!!!
It is for that they start
by equipping them
godforsaken holes (8000
inhabitants) kind .......Genève,
ouarf, mdr, forgiveness… it is not
funny. Finally, one can
prolong me by of WiFi…
"bénéficier
of a service
access to Wireless Internet in the large ones
metropolitan cities,
CQFD.
"85_
places of access [Internet] come from a local initiative"
For the moment, only Altitude
Telecom
(Iliad/Free) has a license, and can sell " Pre-WiMax "
at a reasonable price. Especially
if one
consider that one
can cancel soundabonnement
France
Telecom with 15euros/mois. Le
total grouping attracts world!
If ART is obstinated to sell themlicenses
WiMax with the biddings, without remettre
in question that d'Altitude
Telecom, this one will be in
situation of monopoly, and
will thus be able, in the long term to increase its tariffs. With less
that Altitude Telecom
be interested only in the companies…
D'autre part, si
too
little
of licenses are vendues, it will risk se
to produce an agreement between WiMax operators (with 2 or 3,
that
should not be too hard…il
remain only Maxtel, Bolloré Télécom,
HDRRet the license
main road of Free), like that at summer
the case for the operators
GSM (see price of the SMS and the intervention of the government).
Hold, what I said to you: “Doit
one
to expect a concentration of the WiMax offer?"
“Last March [03/2007], the
operator [Free] did not speak
more than of one “experimentation"
for 2007 [en white area
Freeentend
to propose the nomadism (high banc without
wiredans cities
It is odd, one had learned to me with a
course
of economy that if
one was less than 5 competitors,on
could
to agree to cancel the effect of competition(With 10_
of fine on the sales turnover, that is worth
perhaps the blow of
to continue like that?).
Ca makes too a long time that we pay l' tax
telecom:
2003-1997= 6ans. 6ans * 3 euros * 12 months = 216 euros
C'est à
us them users, who should be returned this money, not
in the State.
216 euros * 15 million users = 3240
million euros.
The fine will sera
of 534 million euros.
Profit of the operators: 3240 - 534 =
2706 million euros. Not
beautiful life for them??
Merci qui?? thank you the ARCEP.
(Calculation is false because there
was not 15 million
users in 1997, but good… on another side,
you
saw lowering the price of telecom frankly
mobile of 2003
with today??? me, not)(operators
continuele
racket on the international oneLe
benefit for
the operators flirte thus with the 500_!Le
roaming has the NOZZLE in water!
(source1source2
Citizen, is you ready to vote
a tax with
monopôle, which would consist
to pay with
the State for each company, X_ of the turnover
market divided by the square of
number
companies of this market? The
goal being of
to return
intolerable economically a monopôle, all in
leaving
to live the start-up.
There is more than 20 operators ADSL
(in 2005). That is to
say them
owners
who will sell of WiMax are animals (I doubt it) that is to say ART
preach
not for many users citizens. I
do not have
dreamed,
it is well the government which indicated it
chair
ART?
Why the operators would not get along
for not
to go up
biddings? Because it
takes them time for
to know.
Thus mutualisation of the pylons or
points high, for
GSM
was not possible (economy of
20_). Damage, it is
the user who pays.
WiFi, that feels good! especially since
that themlicenses is free,
finally for the small operators! (05/2007)
Heu….unless one should not
pay?? (Exemple
of
calculation for the operators of radio local loop)
Yearly rental of provision: R = A *
(DF/F) * (DS/S)
S = 550.000 Km² , F =
2450 MHz, DF = 13 * 20 MHz = 260
, DF/F = 0.1, has = 31709395,59
with DS = 1Km² for
example, that madeR=
5,76 euros
Yearly rental of management: R =
533.572 € * (DS/S)
R = 0,97 euro
I cannot read the site of the ARCEP, que
this texte means (20/02/2006)? qui
is operator?
With my Freebox WiFi close to the
window, I am
an operator?
And then there is the problem
ofcyber-terrorism
To choose a FAI in ADSL
according to the number of customers who it quittent (churn).
1) for one mobile access Internet
with the travail,
it is less expensive than of
to cable and
to maintain wire and catches in the walls. Ca does not make
to work a person to declare a computer on one
catch (that is called mixing) each time
that one changes
catch. One passes from a
part to another (or one
limit to one
other) without losing connection Internet (that is called it
“roaming”).
Les travailleurs
nomads or mobiles are 15 _ more rentables that the others.
withmaison,
one can profit
balcony,
terrace without trainer a wire. As
soon as one has more one
computer,
one avoids cables between those. The
walls are
obstacles,
but le
WiFi is propagated through the doors and them
windows, and
follows the corridors and the stair-wells. WiFi is propagated
also by reflexion on the houses of opposite.
No the computer in the living room!. that the TV.
Yes but
source of media (Internet) is the modem and the computer, it
is necessary
then to send information (music/films) towards
TV.
To avoid wire in the
corridor, there is WiFi. Here
why the FAI propose 2 boitiers: a WiFi modem + a boitier
“decoder” (WiFi towards TV/chaine Hi-fi). Boitiers
of video offset are incompatible with WiFi
(even frequency).
in the bus
(experiments
in Paris in progress), in
l'avionLufthansa/Boeing
with a satellite connection (arrêt
operation in 2006) or ratherpour
a380 AIRBUS) (AIRBUS continues in GSM) (reprise
service with $10 per flight)(mais
with security issues for BOEING,
since the WiFi access is related to the system plane), in the
voiture (Ca is called “war
driving” when one seeks just
to find WiFi terminals), inmétrole train, withla FAC
A test took place on the TGV
Paris/Bordeaux in
November 2003.
The availability is planned for 09/2007dans
52 trains TGVAvailable to the 12/2007 sur
line TGV Is
Aux stations
d'essence des autoroutes (A10). Chez
Carrefour (A62).
With the terrace of one café, in public places very attended (they are called “hotspot”) such as lesgares, aéroportslist with the 09/2006), the restaurants rapides, in the camping
in the hôtels
(chez
B&B
it is free (“service
B&B is true
success! We receive
regularly
returns
users explaining us that they do not go any more but to
B&B because WiFi is free there! “dit
Alexander Casassovici, President de WaveStorm),
Dans les cuisines
restaurants, for gérer
customer orders.
in the rue.
Yes, then I say “in
the street” but it is for
to make “well”.
Hein? Ben yes, customers of the thing-BOXES
(ADSL+WiFi modem)
are not formed to place their thing-BOX of such kind
that it diffuses in the street (so still it is the intention of these
customers) (yes, there are money or service to be gained).
If such is your case, will know that placer is needed
your thing-BOX behind a window
for
that it diffuses in the street.
This message also concerns and
especially the users of FON, which
risk être
disappointed
by the range of their Fonéra (Fon-BOX).
But FON received the message and
proposes an antenna patch
to fix on a pane, by means ofventouses
Une
description of the fontenna, version to be stuck.
The fontenna (antenna FON) increases
the range of
will fonéra. Demonstration
of fabcool
basic antenna:
and with the fontenna:
Despite everything, onewardriving
in Toulouse,
during 1:30, with an antenna of 7dBi on the roof of the car, gives
4000 access points (04/2007). Here
points
outlines
(thank you Stephan):
I consider it regrettable that there
does not exist site to index and
to factorize this kind of initiatives!!
Ca would be used for better
telephoning in
WiFi or with surfer free more easily…
WiFi
free for 8 million habitants (in Mexico City).
On 50.000 hotspots (WiFi access) there
are 6 of them _ which are
free
(at the beginning of 2005). But
ça
could
to change, because the operators seek with
to approach
final customer. Eh yes,
that which reads a publicity pays!
(statistically).
Imagine that Google puts
publicities in the pages
of acceuil of its hotspots (one calls that a captive gate).Ca
there is, it is fait.
Rrrhhaa, the FAI do not
have there
thought ..... it is
bundle!! ouf! :-)
As for the GSM, the
multiplicity of the hotspots
could
to allowgeolocalisation
by
WiFi.
Big
Brother in company
Summers you
“Bill”, “Linus” or
“alien”
?? The projet
Mobile FONd' Internet starts in Spain…
Avec tomizone,
they have
competitors (sourcecarte
Uneinterview
of the persons in charge of Ozonne and FON, on
LCI in February 2006.
2) pour to equip the campaigns
That it is for the telephones
portables or for the access
Internet high banc, policies (mêmes
Europeans) does not envisage to force
private operators
or public to cover 100 _ territory. N
the other hand, l'
State
authorize WiFi to extend the bonds high
flow towards
isolated communes. A
typical solution is
to install one
relatively expensive satellite connection, which ispartagée
with 15 userspar WiFi to deaden the unit on
a few years.
Another solution is of relayer with of Wimax and/or of
WiFi,
the fiberoptics which pass on the motorways or les access
ADSL (NRA) of the close villages. There exists
possibilities ofaggregation
band-widthde several suppliers
access
Internet (FAI). But it is
possible to make the same thing
“manually” for less expensive, while declaring
plusieures footbridges (worms of the different FAI) on one
even network.
The objective is more
reliability, than the profit of
flow.
le
report/ratio at the National Assembly
un bon
exemple by Didier Lebrun (attention at the prices, they drop)
Some personnes
activesont developed RAN (Rural
Area Network), they are reachable sur
one
mailing-list
The idea is to bring high banc until
thatched cottages, by
any means (WiFi long distance (several
kilometers) to prolong existing accesses Internet:
satellite, ADSL, CPL, fibre, etc…).
Precedent | ![]() |
Web boxing ring |
According to |
Randomly | List |
3) pour to pay moins
An access unlimited to the quarter of the price of market.
For 4 users with WiFi
material, if it there
in ONE has which
have a connection towards Internet,il
can
to divide with the autres and to be made rembourser
them
3/4
of what it pays. For the
3 others, they ne pay that 1/4 of
prix of a connection Internet. (This is normally
illegal,
one needs a license operator telecom,
but good…)
N the other hand, if the 4 users use en
even
time Internet for télécharger,
each one
will have only 1/4 of the flow.
Telegraphic connections (if it of a)
take there precedence over
WiFi connections. This
can be prevented in
putting a software
who distributes the flows in way
homogeneous (seeQOS,
Quality Of Service, NetLimiter
(Windows), wondershaper
(Linux)(explications
The remote loading (of large files)
uses
connection
Internet has 100_, therefore in this case the flow is
divided.
But in the other cases: - consultation
of pages Internet, -
remote loading
only one among the 4 users, one will not feel
difference
compared to a solution without division.
Software exists to program the hours
to which one
prefer to download (in
the night for example).
Into WiFi, the flow of the AP
is divided by
the number
users connected above.
In WiMax also, ADSL too. The number of users by
sold flow, is called ittaux
of application
In ADSL, a nice operator will sell the
flow
maximum,
to divide itself between 20 users, less nice, will sell it with
30
users.
The access Internet in France, costs 5 computers
Soit
30euros the access
ADSL (ou 35 euros the ADSL nu), in one
year that made 360euros. Today for this price,
there is one
normal computer. If one changes computer every 5 years,
that
fact that access Internet costs 5 computers. Le
price of the access
is onefactor determining for the users.
La
numerical fracture
companiesextrait of this article (08/2005):
Tariff
means noted for a flow of 1 Mbits/s
per month
A- Paris, great zones of businesses,
equipped with
deblocking with
xSDL or BLR:610euros
HT/mois
B- Communes of the first 10 urban areas
in province:660euros
HT /mois
C- Common peripherals of the 10
first urban areas métropolitainres
and zones not dégroupées but with BLR:710euros
HT /mois
D- Other
dégroupées zones of the territory:800euros
HT /mois
E- Territories having a single offer
ADSL, generally via
France Telecom:930euros
HT/month
F- Other territories without cover
xDSL: 2.000
euros HT /mois.
I point out that there is only a seul
owner of the pair
coppered, onesociété
deprived: France
Telecom…
4)
pour
to telephone
With the voice on WiFi (VoWi-Fi),
prolongation of the téléphonie
on Internet (ToIP)
Linksys and PhoneSystems.net announce
a solution
of VoIP. Panorama VoIP
in
March
2006
PDA GSM/GPRS and WiFi
with Skype in March 2005.
Le
development ofVoIP
fact fear with the mobile operators,(perte
incomes on the roaming)… especially if one can to program
its own telephone.
“The telephones
Dual-mode [GSM and WiFi]sont
already manufactured by Motorola Nokia,
Fujitsu, HP and NEC."
Voir aussi Milkfish
(solution SIP).
Attention with listeningspirates
on SIP with “SIPtap”.
Mariage WiMAX
and MIMO for telephony. One
speaks about “smart
beamformingpour to imitate the MIMO of
WiFi.
sociétésdont
employees
needs have forinternal mobility
deploy the voice on
Wi-Fi with
small scales
"50
_
mobile calls passed through the employees of
companies are
carried out at the office, although
less expensive fixed telephones are
at their disposal"
Project FON will use to telephone
thanks topartenariats
with operators GSM. (good
fear
adviser?) :-)
Voici une carte
geographical
de la
FON/Neuf cover.
Another with Ozone,
Meteor Networks, Fon or the restaurants Mc Donald' s
And with Boingo.
Ca
always did me
frankly to laugh, drawn radio ranges
with the compass (Ozone/Paris)…
"Ce
network does not belong to anybody, “
explained Rafi Haladjian
during the launching of the start-up Ozonne
If it were true, nobody would have
sold it with
Last nine cegetel!!!
To kill competition, the secrecy to
bleed the consumer.
La Freebox
V5
left, and the WiFi telephone which goes
with also… (on
can put besides full with things inside.Linux core 2.6
Wi-Fi Alliance®and
the CTIA mettent
in place a programmepour to test the range of
telephones
WiFi.
(In French,program
ne se
translated not always by software
François and all those of
his WiFi network cantéléphoner
for 1centime of euro the minute, towards
fixed telephones
in France, but without passing by subscriptions Internet (offers
triple play: freebox, 9box, livebox, etc.)(~30 euros) and
subscription FT (14 euros).
Transform an old cellphone into
footbridge towardsVoIP
with
Skype and IPdrum (and benefit from the prices
“SkypeOut”
on your calls of portable, in the coverage area of the old man
portable).
One can call that onemobile
WiFi,
who added to the offer “triples play”,
fact one
offer… “quadruple
play".
Triple play it is telephony,
Internet, TV.Le
débit for
to have the TV drops, if one uses the MPEG-4 instead of
Mpeg-2.
Inventel allows téléphoner
with Internet, without computer,et with one very
good
quality of sound.
And to say that there are some who
telephone 6 hours
for $29, withskype
in the avions [English]! (source
For the train, one would need catches
sector in the oars
(to monopolize
the catch “razor” in the toilets, as I have it
made in the TGV, it is not well!)
Ca is likely to be socially
interesting, if one can use
resources provided by private individuals (WiFi terminals) for
to telephone…
(until or the altruism will go?)(that points out time or one to me
went
in the neighbor who had the telephone, for
télépnoner. One
he gave money or one proposed some at least: -)
courtesy? …)
There are then preoccupations with a
posting, an outline of solution
with
“craiefiti
I am not the only one to think thus,to voir
Ozone
Bientôt
the festival ofUMA
The UMA has the aim of promoting the
roaming enters
networks
of mobile telephony and WiFi network
servants or access points
public with the wireless networkings. The roaming,
that please say that one
passes from one network to the otherdans
the same one
communication.
While waiting for the UMA you can combiner advantages of mobile (GSM) and skype while calling your proper number (skypeIN) which will be redirected towards your corresponding (skypeOUT).
Here a firstmise
in work, at Nortel Networks
Another at LG, a téléphone
Dual-mode 3G/WiFi.
Téléphones
WiFi,premiers
testschez Free and Last nines
Telecom.
(June 2006). Détails
implementation.
Favours for France Telecom which
envisages to make UMA,
with its “LivePhone” (= " Unik”?).
The question that I am posed, it is:
Which will be the maitrise of
the user on changement
of tarif in the course of
conversation?
C'
is
well what I craignais….(06/2006)
Compete with between the PocketOne
of Internet Club (become Neuf Cegetel) and
Twin?
prix VoIP calls (since a machin_BOX) from France
VoIP functions better if all packages IP borrow it even way, a solution withMPLS
A company, or a small rural
network (in WiFi)
can use oneservor
Asterisk to connect telephones
traditional (analogical, FAX) oubien of the téléphones
IP.
5)
to make
house automation
The product presented is only
oneinterface
towards
a connection series (RS232), but this field
could extend
with the management of a house (maison
numerical)
(power station of alarm (already in “without
wire”), shutters
and
electric doors, video monitoring (them
WiFi cameras
already exist), simulation of
presence, energy management,
etc…).
projets more ambitieuxconsistent to connect plusieures technologies of transmission. Personally, that itches me since to discuss a long time on the telephone with my corresponding by listening to it on hatred Hi-fi, with a microphone in the middle of the part ;-)
6)
to meet
Certain software on mobile
devices allows prendre
contact with the people connected on the same access point.
Me, I await the version which will make
it possible to do without the point
access to connect itself with its close relations (with the clean
direction) (I
speak about the close relations; -) I.e.
in ad hoc mode. One
could
then to point its apparatus towards a person and while apputant on one
button, to exchange coordinates…
Which are the competitors of WiFi (2.4GHz/11Mbit/s)?
WiFi to the standard 802.11g
made 2.4GHz/54Mbits/s.
WiFi to the standard802.11
pre-N fact 2.4GHz/450Mbits/s
The values of flow are theoretical, in
practice
that made
less (count
half).
The terminals relay of WiFi are the
AP, their price is accessible
with the private individual.
HiSwan (
Bluetooth (12Mbit/s)(range
10m) (2.4GHz) (protocol L2CAP,
not native IP),
Wavelan (to 800 MHz) (disparu
HomeRF (2 Mbit/s) (disparu
ZigBee
(250 Kbps) (2.4GHz)
objective low consumption and small
range
(à to come)
Like telephone GSM, technologies
following require
terminals relay on pylones (expensive), thereforepas of GRATUITES
connectionspoint-to-point en between private individuals
Hiperlan2 (5 GHz) (à
to come) (I
do not know the price
terminals relay),
UMTS (384Kbit/s) (à
to come) en
test
with
Toulouse102
euros (10 hours) or 15
euros of
the heure (3 operators thus not of competition) (voici
of
what
to have an idea of the tariffs)(la
Visio
with 20euros/heure)
UMTS R5 (1Mbit/s) (à
to come) (you have 100
billion euros to be refunded,
finally if you
use!!) pauvres
operators (suite
Flash
OFDM (10 times the UMTS) (à
to come)
will Ultra
Wide-band (UWB/WUSB) (400
Mbit/s) (à
to come)
(range
10m) be likely to replace Bluetooth
Wimax (à to come),
it is like WiFi,
but with
Watts, of the pylons and the licenses moreover, public price and
technological effervescence in less. But
that seems to change
with l'utilisation
technologies OFDM+MIMO
WiBroà
to come) (for June
2006) (30Mbps) (2,3Ghz) (Wireless
Broadband, standard 802.16e) it is of Wimax for
South Korean.
If you move with 250km/h (or less), it
there
will have in 2006 (still not seen in 2007)
leMBWA
BluWan
(40,5-43,5 GHz) (12Gbits/stheoric)
HSDPAà
to come) (3Mbit/s)La
standard envisages to reach 14 Mbit/s,
with a bond going up going up to 320 kbit/s
802.16mà to come,
not before 2009) (1Gbit/s
into fixed and 100Mbit/s in mobile) with MIMO.
Le LTELong Term Evolutionà to come) in 2009/2010 should make 100Mb/s. Oui, it makes already 173Mb/s in 2008.
One day, of the radio connections with 2Gbps (56GHz) withle Gi-Fi(spectral effectiveness of 0.035 (28Hz by bit))?
source
01net
Versions owners (compatible with
11Mbit/s with
other manufacturers) allow of WiFi 802.11b 22 or
44Mbit/s.
Idem with the 802.11g with 54Mbit/s,
there exist versions
owners
faster: 108Mbit/s and125Mbit/sBut I believed to understand that certain
technologies used
channel 6 “to dribble” on those of with
side…
Une
comparison of the costs in energy
electric emphasizes that WiFi is 25 times
less greedy than WiMAX, which, is to him 2 times less than the 3G
WCDMA.
Swelled, MHz, Mb/s it is what?
Hz:
is the unit of the hertz.
Ca measures a frequency,
i.e. the number
variations
in one second.
Electricity, in
France, is delivered with
50Hz.
b/s,
bps, bit/s:
mean
all the same thing: bits a second. Ca
measures one
flow
numerical informations (or data processing)
exchanged. A flow
measure a quantity for a given time.
bit:
it is the unit of
computers, that is worth 1 or 0. .
B/s:
attention, there is a trap!
It is about byte (English
word) a second. byte
means byte.
A byte is a whole of 8
bits.
bps:
attention, still a trap.
Ca can be bauds a second.
baud (or
bd
Ca becomes complicated.
The computer
knows that the bits which are worth 0 or 1, therefore a bit has 2
states
possible (perhaps a day onewill codera
5
bitsdonc 32 possible states). Connections between computers
can
to handle tricks which have 4 states
possible. Thus one
trick can transport 2 bits.
The number of states is called the
valence. The valence of a
bit
is worth
2. The valence of the
trick of my example is worth 4.
And bauds then? The bauds are the tricks of my example.
To convert bauds into bits it is
necessary to know how much
bits are coded in a baud for the connection in question.
How one makes? Ben for example if one varies
frequency
(like the frequency modulation, the FM of the radio), one
can decide
that a variation of +1 code state 1 of the bit and that “not
of
variation " codes state 0 of the bit. In this case the valence
equal
2.
But if one adds the two bits to code
them in only one
variation, one could have:
“not of variation”
if the two bits are to 0,
variation of +1 so only bit 1 is to 1,
variation of +2 so only bit 2 is to 1,
variation of +3 if the two bits are to
1.
K,
(k):
Ca please say kilo,
thus 1000 (if one speaks about Hz).
M:
that please say méga, therefore
1000 times one kilo (if one speaks about Hz).
G:
that please say giga, therefore
1000 times a méga (if one speaks about Hz).
if one speaks about Hz?
Ben yes, for the data processing
specialists who measure bits, 1 kilo
1024 are worth (2^10). It
is insane not? But like
one is mistaken that of 2_,
one lets make confusion.
Thus in my example one can code 2 bits
during one time
of
the frequency (one period corresponds to
one Hz).
The way of coding the bits makes it
possible today to place
until
256 states (= 8 bits) per period (0.125Hz by
bit). But these
systems are more sensitive to the disturbances and by
consequentle
flow
reality goes down again in conditions of ground (practical
flow
different from theoretical output).
This is true so much so that one prefer to change system of coding when the connection is bad. It is what explains various possible flows of WiFi according to outdistance.
When a WiFi material tries to change system of coding, not badly of bits are lost. It is thus preferable to select (manually) flow right in lower part.
The spectral effectiveness
(bit/sec/Hz/cellule) is
division
flow (in b/s) by the carrier frequency
(2.4GHz for
WiFi) and by the number of cells. A
cell is one
equipment
WiFi, there is as much as connected users.
WiFi 802.11b has a maximum spectral
effectiveness of: 5.500
000
(b/s)/2.450.000 000 (Hz)/1 = 0.00224
Ca wants to say that one transmits 445
times the same bit (445Hz by
bit).
It is much, and it is
improvable perhaps
with802.11n(theoretical
output 320 Mb/s for 2.4 or 5 GHz)(7.6
Hz by bit)
The spectral effectiveness gives an
idea of
“output”
system of coding.
All this is true only in the condition
of comparing
system
codings which have samebande
passante
(BP).
Kézako? (that is what it is?): It is the diameter
(of) pipe (X)
used in parallèlle multiplied by
(ur) the number. The
band
busy is
then the equivalent of the sum of the sections of the pipes
used.
There you understand that
more I have pipes in
parallèlle, more
the aggregate rate will be high.
A pipe is a channel. A canal has une
width of bande (difference between
frequency more
high of the channel and the lowest frequency) which corresponds
with
the section of my pipe.
For information, the 802.11b has 3 (or
4, to see low)
disjoined channels (on 13 available in France), whereas the 802.11a
have 8 disjoined channels.
One cannot thus compare spectral
effectiveness,que for the
same BP.
l'
effectiveness should not be compared
spectral of fiberoptic,
who has “I do not know how much width of channel”
time the number
channels (160), with the spectral effectiveness of WiFi 802.11g
who
have ONLY 13 channels with 20MHz by channel…
To compare one would need a
measurement which divides the effectiveness
spectral by BP.
When one arrives at a spectral
effectiveness
near to
1, it will be necessary to worry about the antennas used. Indeed,
les
antennas with whorls (the omnidirectional ones) superimpose them
adjacent waves (periods of the signal, the Hz, for one
even bit). The antennas
which have one
dipole,
will not have this problem (example; the family of the SD27).
Which is the bond between flow in bit/s and bytes transferred?
One takes as assumption that
none
system of transmission
is not reliable. Thus
one sends a whole of bits (a byte, or one
package of bytes) and one checks that they are well
arrived. For
that one applies before the emission a calculation which gives one
key
and one sends also the key. With
the reception, one
still calculate
key, it must be equal to
the received key. If the
bits have
summer abimés during transport
(different keys), one in
inform the shipper and one them
reforward. Information
of
checking and the abimés bits occupy one
part of the flow,
what explains the difference between the flow
theoretical and flow
measured.
The more the bits are
abimés, the more the flow decreases.
There exist protocols which do not
check the good one
reception
bytes: UDP (which has the same role as TCP).
One can check a byte with a bit
additional, that
apelle the bit of parity.
One can check a package of bytes with
bytes
additional,
that apelle CRC or check sum.
Count 10 at least _ flow for
control bits (for
a protocol worthy of this name),
what makes un
byte for 10 roughly speaking
bits
Which are the various standards of WiFi?
The 802.11 is
nomalisé by the IEEE.
Le a,
le b
and nconcernent
it
electronics, the others are layers rather
software.
type | comment | carrier frequency (MHz) | theoretical output (Mbits/s) | range with antenna (S)omnidirectionnelle (S) (meters) | range with antenna (S)unidirectionnelle (S) (meters) | treatment of the signal | No. of channels |
802.11a | good for the city | 5700 | 54 | 50 | ofdm | 12 | |
802.11b | most widespread. good for the countryside | 2400 | 11 | 100 | 8.000 (legally, if not more) | dsss | 13 |
802.11c | functions “bridge”. becomes 11d | ||||||
802.11d | limitations France and Japan | 13 | |||||
802.11e | quality of service (ping and flow minimal) | ||||||
802.11f | roaming (change of access point without disconnection) | ||||||
802.11g | B version “city” | 2400 | 54 | 100 without obstacles |
8.000 (legally, if not more) | ofdm | |
802.11h | management of power against mutual jamming | 5700 | ofdm | ||||
802.11i | safety, replacement ofWEPThe WPA is not retained (with TKIP). Le WPA2 is retenu, based on an encoding AES. |
||||||
802.11j | as (legislation has it different) | 4900 | |||||
802.11k | routing according to the quality of service,geolocalisation | ||||||
802.11ma | Amelioration definitionsau level of the physical layers (PHY) and access to the media (MAC) | ||||||
802.11n | pas before 2006 (use of technology MIMO). | 2400 or 5700 | 320, 600
in 2007? rather 450 |
higher than the 802.11g
with
reflexions |
??? depends on the number of antennas (3
to 7) |
||
802.11p | Wireless Access in Vehicular Environments (WAVE). roaming fast | ||||||
802.11r | roaming rapid directed continuous flows, streaming kind video, VoIP etc… | ||||||
802.11s | réseaux
with a grid ;-) assessment in March 2006 |
||||||
802.11t | Wireless Performance Prediction (WPP) methods of test, QoS. | ||||||
802.11u | harmonise the communicationentre WiFi and networks external (telephony) | ||||||
802.11v | gestion networksWiFi: monitoring, configuration and update (centralized) | ||||||
802.1x | authentification on waiter |
Comments on the table:
range: with an one-way antenna (only
one
direction,
5° approximately) or omnidirectional (on 360°)
the number of channels depends on the
laws on each country. Japan
is
passed from 3 to 14, others 8 or more. France
passed from
3 to 13, but by keeping a WORSE limitation,
i.e. one
can legally use only the antennas
omnidirectional
of origin if one does not separate the emission from
reception.
More there are channels less one has
chances to be scrambled
mutually in the same geographical area.
Parmis the 13 channels available in
France, it would be possible
to use 4 of them disjoints (which does not interfere
between them; channels 1,4,8 and 11), if one takes into account
filtering. (Passe-bande
(in pi) constituted of 3 components before the exit
antenna?)
The usual disjoined channels are: 1,6
and 11.
The more one is scrambled, the more the
flow drops
(automatically).
Treatment OFDM is more suited than DSSS
to
to eliminate it
mutual jamming.
With the WiMAX, other standards arrive.
source
wireless-fr.org/b002_norme80211b
Marc Olanie
source
wireless-fr.org/b002_norme80211a
Marc Olanie
source hsc.fr
… securisation_802.11b.pdf
source 80211-planet.com
source
http://www.01net.com/
source
http://blog.netpartoo.com/
Y' has what has to take that which goes most quickly?
The increase in the carrier
frequency has 4 effects
who us
interest:
1) the course of the radio waves
approaches a line (like
the light). Disadvantage:
one does not circumvent any more
obstacles.
Diffraction becomes
weaker. Diffraction it
is when
the object which receives the wave becomes small
transmitter.
2) the waves reflected on walls are
more
strong. (phenomenon
of echo: advantageous inside
buildings, becomes
scrambling if one receives the principal wave and sound
echo.
3) it authorizes a flow (in
méga bits by
seconds (Mb/s))
higher.
4) the way traversed by the waves in
the air, for same
received power, is lower. Diffraction
in the air,
rain, snow.
It is for that which I say that of WiFi with one high frequency is better for the city or the interior of the batiments, then that WiFi with more low frequency is better for countryside.
I do not know what it is of
capacity
to cross
walls. A priori, I would
say that with the increase in
frequency,
the waves cross better (x-rays to do radios of
human body). More the
matter contains water or
metal,
more it stops the waves. One
needs holes larger than
la
wavelength for letting well pass the waves.
The wavelength is calculated as
follows: lambda = speed of
light
/frequency.
Example: 12cm = 300.000 km/2450 MHz.
Théorie source radio and calculations , la theory of the antennas summarized a little (in English)
I simulated comparisons
(large a mercy
in Bent Roger
and its software “Radio
Mobile
144
MHz (frequencies of the radio operator amateurs),2400
MHz5700
MHz
Why y' has 2 antennas on the AP?
Everyone agrees to say that electronics selected the antenna which receives best, but…
A AP is an Access Not (Access
point),
i.e. one
electronic boitier able to receive packages of bits
of a shipper has and to send them to one
recipient B, then
that has is not in connection with B. One calls that the mode
“infrastructure”,
in opposition to the “ad hoc” mode which does not
allow
to make relay.
The antennas in question are
omnidirectional.
That is to say the problem which
consists in making an antenna
who does not collect
that a transmitter, at a given place,
with an aim of being it
less scrambled by the others.
The principle is “to work” these differences to reveal only the wave which comes from a direction data (our transmitter).
That is to say a part or there
are a musical bottom, and two
people
in the corners.
I place a microphone (A) close to that
which speaks, and one
other
microphone (B) with the mileu of the part. By
electronics, I
calculate the signal resulting from has less B. This signal gives me
le
speech of has without the musical bottom. It is like that one
fact
one-way microphones. Finally
almost.
As the sound is propagated with
300m/s, it is necessary that I delay
(for
to superimpose) the signal of the microphone has before withdrawing to
him
the signal B. For 1m
between has and B, I must delay has of 1/300 S,
equalize 3.3 milli second (3.3ms).
With our two antennas it is
the same thing, except that
les
waves move with 300.000Km/s. I
suppose that
it is that it
mode “diversity”.
10cm => 0.33 10th-9s = 0.33
nano second =>3GHz
Antennas with 8 branches existent, but not yet for WiFi (though). It d'antennes acts adaptatives (intelligent). In this case one does one species oftriangulation (by treatment of the signal) between the antennas and the point distantpour to filter the signals which are intended to him. Antennas must be isolated of a half wavelength (6cm for WiFi) (dephasing of 180°), this relates to only the omnidirectional aerials to make them equivalent to an antenna one-way at one moment T (see ZoneFlex from Ruckus Wireless). It would seem that the UMTS will not benefit from this system, already operational in other countries (Asian).
One from of thus deduced, that in urban environment (there or there is many echoes), modes “right antenna only” (or left), give less good performances that the mode diversity.
The treatment of the echo on
walls is
similar, put at
leaves that the wave is shifted much in
time,
since it course of the larger distances. Thus one
difference
of way of 15 meters corresponds to one
difference in time of
50 NS (20MHz).
One can also exploit the
travel time
wave
to determine the distance to the AP, and thuslutter against the hacking
Products with 7
antennes is in project at Netgear, with the “BeamFlex
technologyThe
competitors Linksys (Cisco) and US
Robotics await standardization 802.11n. Belkin proposes (March
2006) materialincompatible
with the future standard 802.11n
Telephony3G
should use MIMOEspecially
that there exist puces
dedicated to the MIMO (11/2007).
If technology is mixedMIMO
and non-MIMO, one gains nevertheless in
flow, but not as much
that with all the apparatuses in MIMO.
tas.spirentcom.com
source
… pdf
source
wifi-vitry.net/article
Marc Olanie
Yes, but all that they is assumptions?
Ben non,
not since j' have
checked!
and fake.
Initially it is necessary to move away
the thingummies wifi parce sufficiently
whether they “sprinkle” or
“radiate” with a little
everywhere (I checked with paper aluminum
to make mask),
all is not armoured inside.
I suspect them
to sprinkle (also) by the cable of food (considering that the part
transmitting is right with dimensions of
food part, finally
on my USR2249).
My AP continued to function whereas I
had
disconnected
2 antennas, the guy. I
moved away them (one
on the 2nd floor,
the other with the DRC), once separated from 2 times 25cm
of concrete, that
calmed. I gave the antennas to carry out the tests
Then, “it” is said
to me that the selected diversity mode
better antenna?? Thus if
I in suprime one, then that I
gives and that I remove the other, (by keeping all
environment identical (position, orientation, polarization,
natural person in the beam of waves, etc.)) then mode
diversity must function at least as well as one of the modes
only one antenna?
Ben they is FALSE, it walks more
badly, ya
not photoWhether
it is the right-hand side or the left which I connect
only.
Moreover you can test yourselves! (be
methodical,
rigorous and patient)(one
draws the conclusions only on what
is répétable).
Attention, the diversity mode
is a mode of training, it
fact of the tests. I
thus made an average slipping on 8
measurements (several tens of seconds), and I concluded when
measurement is stabilized. Contrary
the modes only one
antenna
are stable as of the first measurements.
Ca seems logical, since it has many
treatments
(described
above) to many measures, to make in mode
diversity.
The diversity mode seems very
“intelligent” since if
I put an one-way antenna (on the right exit) in
more of the 2 basic omnidirectional aerials, it is left there
very
well! Ca please say that
it does not suppose the spacing enters
les
antennas like constant, but which it has an algorithm
more
complicated. By analogy
with the microphones, it is a little
like
if the one-way one collected the signal of that which speaks (A)
and the 2 omnidiectionnelles ones collected the background noise (B).
But the manufacturers, they say ......
Manufacturers
protect
their secrecies of fabriquation.
Moreover the tendency is to be
protected moreover in
more. At the beginning,
the materials could be programmed
(example of those which
contain PRISM II) whereas my USR2249 (more
recent)
who contains a ACX100, is protected. The
kit of
development
is communicated only to the partners of Texas
Instruments.
These partners engage (by
contract) with not
to diffuse
the kit. unixiens
write
pilots, thank you with them!
But good, the last chips are
credits, and allow
“to treat” also network GSM. When it is known that
certain solutions of payment (“protected”;))
)
on Internet, are based on codes communicated by GSM,
you
see what I want to say…
And then when a manufacturer (Agere) arrives atrésultats (technic MIMO: 162Mbps in 5GHz) , it releases a little knowledge.
How
to take the control of its material via Ethernet (RJ45 or
WiFi)
since a PC?
http://www.sputnik.com/products/gatewaydownload.html
http://www.wifi-vitry.net/imprimersans.php3?id_article=4
http://wiki.personaltelco.net/index.cgi/Prism2Card
charts PCMCIA with a chip
PRISM II
[PrismII based cards:
limited functionality]
Addtron AWP-100
Ambicom WL1100 PC
Belkin F5D6020
Compaq WL100
Dell TrueMobile 1150
Series
D-Link DWL-650, DRC-650,
DCF-650W
Farallon SkyLINE
HyperLink Wireless
LA4111 Spectrum24
Wireless LAN
Urgent Linksys WPC11
Wireless
Netgear MA401
SMC2632W
Efficient SpeedStream
SS1021
ZCOMAX AirRunner/XI=300
source pcmcia-cs.sourceforge.net/début
2003.
To choose its material, herelist
of
materials
compatible with NetStumbler,
a tool for scanner/to seek access points.
The WRT54G
(Linksys/Cisco) turns under Linux (y' in has which very
included/understood!),
and thus can for this reason,être
charged with what one wants inside. For example SveaSoft or OpenWRT.
USRobotics
their emboite the pas,
but with only one antenna: - (
Here are others:
Sveasoft
(17 euros), DD-WRT
ProjecHyperWRTWifi-box
projectOpenWRT
(for the pro of Linux).
source
des URL above.
The version
5 of WRT54G, did not make it possible to change the software
(firmware),
but maintenant
it is possible, without modification of the material.
The customer is right always, thus,
Linksys/Cisco having included/understood
what made the success of the WRT54G, it leavesWRT54GL
(L like Free?)
With the case or the WRT54G a rare food
product, the RAN devriendrait
group,
and more particularly François Laperruque,
propose one
alternative (for the moment in 802.11a with 5GHz); the chart “WRAP
"
and its software (voyage
Linux) and the charts WiFi (miniPCI) which go inside.
And as the RAN group is very active, Marc Dilasser, it Breton, gives usune description of the Buffalo WHR G54S which is an alternative to WRT54G.
Une
another solutionis
the FRITZ!
Boxqui has in more one modem ADSL and the voice on IP
(VOIP)(SIP)(Fonisée).
It is a
“box” multi-operators, if you want.
The problem it is thatl'
antenna is not
detachable!!
aïe! damage, not good for the RAN.
166 euros/unit oupss!
For a portable PC, best is to
have a connector
external on the chart PCMCIA, exemple
With
what is used for to take the control of its material?
It would seem that the electronics of
the AP or the WiFi charts
that is to say
the same one. On the
other hand the prices differ, and them
functions too!
In short, there are two types of
material: the 802.11a and the 802.11b.
The 802.11c types, D, E, F, G, H, I,
1x, are only software
who can be placed in microcomputers
dedicated to these
tasks (microcontroleurs are said) and consequently
locked up
in a boitier.
Another solution consists in
programming it
material since
your computer (the PC). When
the logiciciels are available
AND that the material allows this programming, one can
to choose
the functions which one wants to make with WiFi.
Par exemple:
- to adjust the power of the emission
part (to minimize
les
interferences) [; -) with FT&ART],
- to post the force (dBm) signal
received (that
avoid being equipped
of a portable PC with pcmcia and netstumbler),
- to connect WiFi to the LAN (network
filiare) (with a catch
(RJ45)
and a cable which joined the charts network of
others
computers),
- repeater (to be used just as relay
to connect 2
others
wifists),
- router (to choose towards whom to
send a package received which
ne
is not intended to me),
- waiter of IP addresses (to allocate
these addresses dynamically
(DHCP)),
- cryptage,
- waiter of authentification.
The problem is that if one
wants
to move away the antenna from the PC,
to put it on the roof for example, the power sent
and
received by the material WiFi will be
lost in the cable (one
“pigtail calls”). And on does not put the PC
on the roof
How
to know if a WiFi connection will go, without material?
For outside, the software
“Radio operator Mobile” allows
to simulate:
- emitted power,
- losses due to the cables and
connectors with the emission,
- profit of the sending antenna (plain
or omni directional),
- losses due to the relief (and other
characteristics) of
ground,
- losses due to the distance in the
air,
- profit of the reception antenna
(linked or omni
directional),
- losses due to the cables and
connectors to
reception,
- the threshold of sensitivity of the
receiver.
Alas, I did not find information on the buildings and the trees (information “sensitive” for soldiers). Thus an impossible connection according to this simulation, will be really impossible. On the other hand a possible connection ne will be really that if there is no obstruction by buildings or trees. In this case, only the tests will be able to answer with the question. If one sees (with the eyes) the distant point, it is inevitably not the best case, but ya the strong ones chances so that it goes.
Here what can produce the software “Radio operator Mobile”:
The green bonds authorize a flow of
11Mb/s
theoretical (or 54Mb/s),
the yellow bonds authorize 1Mb/s.
For the interior of a building, the
Wiplan software
of atSygmum(the
company
do not exist any more), allowed to simulate the cover of each AP:
But this software is not
available any more because it belongs
henceforth
to the INSA of Lyon, as Guillaume explains it to me Of
La
Rock, a programmer of Wiplan
On the other hand, other software
exists:
- "SITE PLANNER " of wireless valleynetorange.comairwave.com) with The USA which has just been bought (2006) by Motorola,
- "WINPROP " of Awe-communications in Germany. Example of result:
There are some which treats
the wave propagation into 3
dimensions: SimuEM
3D
How
to implement the software “Radio operator Mobile”?
Le logiciel "Radio
Mobile "
use data of altitude to simulate connections
radio.
A partir de maporamaet
of one
postal address, you will find the coordinates in
degrees/minutes/seconds,
to locate a WiFi station in the software.
You will find the data of altitude for
your need ongeoengine.nima.mil
I used the formatdted0avec
the precision “Military Specification”:
Desired Product Level = DTED
level 0 (30 arc second)
Navigate using = Starting Center Not
Starting Center Not, to seize the
coordinates
to click “roam DMS”
=> new page, to go in bottom,
to correct the coordinates to have multiples of
degrees,
to click “raster to
export” => new page, to click
on the file ZIP, which makes 80Ko by zone of 1 degree
square.
To decompress by keeping the
repertories.
Y
it has
ancestors of WiFi in France?
Yes, of the networks radio operator
amateurs already
in place (144MHz for 9.6Kb/s),
we give the example:
f1te.org/numerique
“Within the
framework of excavations in the Russian basement
until
100m of depth, the Russian scientists found
vestiges of copper wire which went back to approximately 1000 years. Les
Russians concluded from it that their ancestors laid out
already it there
is 1000 years old of a network of copper wire.
The Americans, to make good measure,
have
also proceeded
with excavations in their basement until one
depth of
2000m. They found glass
fibre remainders there.
It proved that they were approximately
2000 years old.
The Americans concluded from it that
their ancestors
laid out already
2000 years ago of a glass fibre network
numerical. And
that, 1000 years before the Russians!
One week later, in Belgium one
published it
official statement
according to: Following excavations in the Belgian basement
until
a depth of 5000m, the Belgian scientists do not have anything
found whole.
They concluded from it that the Former
Belgians laid out
already it there
is 5000 years old of a Wifi network. “: -)
Which
is
the price of the material to date?
there are many sites!
http://www.mhzshop.com
http://www.fwt.fr
http://www.instantbyte.com/wireless.htm
http://www.dlink.com/products/wireless/index.asp
http://www.hflan.com/
How
a link long distance is established?
On remplace
the antenna of origine by - is an antenna the commercial (SD27
24dBi, with 65euros), - is an antenna
manufactured oneself (limps
of ricorée 11dBi) (antenne
strainerOne can
also put a keyUSB
in one limps of ricoré, but on
ne
does not know the profit
Des clés
USB (which makes 15dBm instead of 17dBm for the AP) exists
with external connector, to connect an antenna at fort there
profit:
If you have chance, your key USB
contains
perhaps one
connector U.FL (inside), Comme
that one:
and here with a pigtail U.FL (towards
RP-SMA undoubtedly)
connected
above:
This connector seems to be a MS156,
rather than one
U.FL (need for a point of adhesive).
Attention with the mechanical
brittleness of
assembly!!
The WiFi material of origin is
delivered with one
(of) antenna
omnidirectional (right stem which “radiates” all
around it, with 360 degrees), to respect them
laws on
power output in an unspecified direction.
By replacing this antenna by one-way
(which
only in only one direction) one emits increases (one concentrates)
power since the wave is not sent any more on
360°, but
on 18° (approximately) only, therefore 20 times more.
The P.I.R.E is the radiated isotropic power equivalent. It is the maximum of what is measured around (360°) of one antenna. Thus for the same power sent by the cable (pigtail), an one-way antenna will have WORSE 20 times higher with omnidirectional. Precisely dBimesurent this faculty to pass the waves in air.
Hold, for example here are some photographs of my antenna ricoré, connected to my AP (a USR 2249):
and when I would like to put 3 ricorées (to make a network with a grid), I would use onecouplor 3 voies, oubien I would manufacture it myself (considering price of $60).
One uses a coupler to have a adaptation
of impedance (50 ohms) and not too many losses.
After being itself occupied antennas,
it
is necessary (to try) to regulate
certain parameters related to the travel time
(longer)
waves, to obtain good flows
For the moment (09/2006) it is not
possible that by changing it
firmware (software) of the WRT54G and en
carrying out UNIX orders
(thank you Didier).
If one does not fear the illegality, one can also put one WiFi amplifier on each side of the connection.
How
one takes omnidirectional a step expensive?
avec du gros
cable hyper frequency bidouillé.
With a little more work, on
can make 10dBi with 7 whorls, oubien a 14dBi
(9 whorls) at a cost of almost 10euros (without
to count
madeleine and the end of chocolate; -)).
That is
what can scramble us and which scrambles one?
The apparatuses which are on the same
frequency or
at frequencies
harmonics. A harmonic is
a multiple frequency of one
another frequency (of which the division of largest by
more
small an entirety gives).
with 2.4GHz, there is (I always do not
have
checked these
information):
the microwawe ovens (I have
checked),
the missiles crotales or radars of the
Army
Frenchwoman,
transmitters (or cameras) for
to off-set it video
(television),
Bluetooth,
certains radars
automobilesqui, in WiFi, close to the road,theirs envoient
information with the police officers hidden further.
The tool to observe if the
frequency is free
be called one
analyzer of spectrum, but it costs an arm and a leg! By
against there exist equivalents not expensive (150 euros when
even,
09/2006), to seeWi-SpyOne
version
antenna
external of Wi-Spy
A beautiful morning the network of
Sylvain did not function any more,
afterwards
investigations, it determined that sound
network was scrambled.
Stephan, Sylvain and myself let us have
decided to seek it
culprit, with a WiSpy key which was
made directional
thanks to one limps of ricoré. Here
thing: Then we checked
directivity by putting a AP on channel 2 with one
“beacon
interval " of 1ms (at bottom thus):
Variation of the width (of the
intensity in fact) of
gross
column on the left must with the fact that I turned
the antenna in
another direction that of a. On
channels 8 with
11, one
a normal use of WiFi (beacon interval of 100ms) sees.
Then we left to
fish… and we found one
beautiful LINE: -) a frequency with 2434MHz which
sprinkled until
bell-tower of the church:
After a psychological pressure exerted
by
Sylvain on
owner of the hovel, it is
proven that our jammer
consisted of a camera with
video offset, which is not
perhaps not approved in France, if it comes
the USA (200mW).
The apparatus génait also a
WiFi printer at another
neighbor.
As an information, my
“wavemeter” does not have anything
found,
since the power was not enough
raised for him, then
that this same power scrambles WiFi which works with
of
low powers (- 60dBm).
A solution (temporary?)
consisted with
to change channel on
the network of Sylvain. If
the parasitor persists, it will remain
to determine
if it exceeds the French standards (with
to see with the ANF, 1500euros
of fine). If it is not
the case it does not remain any more which has to pass in
802.11a oubien to put fine netting to make obstacle. La
bandage 2.4GHz is free with all that implies!!
To have an idea of the
quantity
of use of the waves
radio, look byexemple
among Belgians
How to do without the electric cable until the AP?
The POEconsist
has to use unutilised wire of a cable
network (connector
RJ45) to bring the food to a. Wire
unutilised (Bi-directional
dated) correspond to a use for
telephony (ISDN). If
you directly connect the AP to the PC it is necessary to use a cable
crossed (also called “modem cable”) which connects:
connections
“tranceive” of with dimensions has with the
“receive one”
with dimensions B,
connections
“receive” of with dimensions has with the
“tranceive one”
with dimensions B.
It is thus judicious to use the twisted pair (7-8) for to bring the food. “Returns of measurement” (judicious) can be used with terminals 4 and 5, for to check that the tension with the good value at the boundaries of a.
Caution!!! I was made have, when I have cabled that, that did not go. The indicator “power” ignited but the AP did not function (the indicator dated does not ignite).
Explanation: my Ethernet
cable made 25m (one has right
with 60m).
When I put the food of an
end (with dimensions PC), other
boils
(with dimensions AP) I lost 1.2volt. Like the food
deliver 4.7v
(in load), there remain nothing any more but 4.7 - 1.2 = 3.5v, and
there,l' AP
go more
Alors what to make? 4 solutions
1 - to put the computer in the attic, with one cable Ethernet of 5m: Ben let us see!!! it is owl as solution (them owls live in the attics, not me).
2 - to use the 2nd twisted pair to put it in parallel with the first, as that I would lose 1.2/2 = 0.6v, therefore the AP will be fed into 4.7 - 0.6 = 4.1v, I do not have tested, that perhaps go (for 25m).
3 - to change the food for another which deliver 4.7 (or 5) + 1.2 = 5.9 (or 6.2) volts. Like the consumed current do not vary, it is not the sorrow to seek to control tension with 4.7v with the 2nd twisted pair.
4 - to use the POE only at one minimal distance. If the goal is not to put a 220v under the rain, the useful part of POE can be summarized at distance AP/attic. In this case length POE is equal to: length of mast + 1m (to go to the shelter of the rain). For a mast of 4m, made Ca (25/(4+1))= 5 time less voltage drop, i.e. 1.2/5 = 0.24volt. There,c' is sure that it goes, since there remain 4.7 - 0.24 = 4.46volts. To 4.2v it goes, to 3.8v it goes more.
One can notice that there remain 25 - 5 = 20m of pair twisted who can be used to bring the 220v until the food (it is more aesthetic to have 1 wire which traine, rather than 2 (according to my wife). The risk is to bring parasites (50Hz) on wire of data, but like the current is weak there is chances that it goes.
Calculation of the current on the 220v: puissance= 5volts * 0.8 amps = 4watts. A bad food should have (with the conk) one output of 0.7, therefore power absorptive on the 220v will be of 4/0.7 = 5.7watts. For 220v, that made a current of: 5.7w/ 220v = 26mA (milli Ampères) which does not induce parasites on wire of data.
The cablage
10/100Base-T and the cablage
100Base-T4
It is you which see!! Personally, I chose the numéro
4 (minimal distance = 5m); elle
functionThe
terminal voltage of the AP is (in load) of 4.2v. For
parasites, y' does not have any, according to my measurements which are
(with it
day)
duration of the “ping”. I have values on average with3msThe players in network will appreciate!!
The “ping” is an
order which I type on line,
i.e.
- in a window “terminal” for the unixiens, - in
a window DOS for the windosiens. Syntax
is:
ping xxx.xxx.xxx.xxx
with X to give address IP
of the material
wifi
distant.
The order ping is used to know if a
machine is
present on
Internet network.
Caution: the firewall
(avoid-fires) can stop
les
orders “ping” (ICMP echo)
For the continuation, @ wants to say address.
C' is what a hub (repeater), a switch, a bridge (bridge), a router?
All this equipment provides the function “modem cable " or cables cross.
the hub connects all
electrically,
the bridge filters the @ip according
to @ mac,
the switch is a bridge which moreover
separates the types from
networks
materials (concept of bit),
the router separates the fields d'@ IP.
The router must
to be
configured to function.
The MAC addresses it is of Ethernet, IP addresses it is of the Internet.
The MAC address is closely related to serial number of the material Ethernet network. I point out that WiFi is initially of Ethernet. For certain materials, it is possible of to change l'@MAC, therefore mistrust on safety based on filtering @MAC!!
L' addresses IP (xx.xx.xx.xx) can be fixed or re-used (y' does not have any enough for everyone on Internet). L'@ IP is coded on 4 bytes, that made 2^ (4*8) = 4.294.967 296 (4 billion) addresses possible, but that is not enough.
source practicallynetworked.com/networking/bridge_types
How
to choose between fixed or re-used address IP?
If you bought one @ fixes, it
is single with
world. By
against those which one not bought fixed d'@ IP, and which in
choose one randomly, can take of them one which has
summer
bought by someone else, and can, one day, to enter in
conflict with this one. Of
or interest to ask one of them
re-used.
For example, the supplier of access
Internet (FAI) gives some
one
different to each time one connects oneself with
a modem 56K,
or connection ADSL crosses every 24:00 to force
reallocation
of one @ IP.
The FAI, the companies, that avoid to them to have time of calculation and of the flow network dedicated to part of re-use.
Addresses
MAC, addresses IP re-used, how that
goes?
The MAC address is coded on 6
bytes, that
fact 48bits. 2^48 =
281.474.976 710.656 (280 thousand billion) possible addresses.
This makes it possible to
allot a single number to each
material network.
One indicates by “brin
"
the whole of
computers which are electrically connected (with
a cable modem
(2 ordi) or a hub (several ordi)) by Ethernet.
When one puts this material
in the computer,
this one goes
to charge with finding one @ IP corresponding to the @MAC (
opposite correspondence (stored in a table) is made
by
protocol ARP). For that,
it will ask all them
computers
same bit, by a request which speaks
with everyone (broadcast
in English). The
computer with which one programmed
this function
will answer (in broadcast) the computer which has
fact the request,
by a value d'@IP. This fonction
be called DHCP
When a material wants to speak with a
@IP, it
will use
count ARP to find l'@MAC, and to send information to him.
The computer which answers provides
the function waiter DHCP,
the ordi
who request is customer DHCP.
Attention, if there are several
computers which answer,
it is
fastest which gives l'@IP!!
The normal configuration is: Only one
waiter DHCP by bit, or
at all.
Function DHCP is
hierarchical. Ca please
say
that one can
to propagate this request (on different bits)
(it is said that
the protocol is “routable”) until finding one
waiter DHCP.
The equipment which sees 2 bits must
have 2 @MAC? bingo!
it is one
switch or a router.
Today the AP can make customer
DHCP and waiter DHCP,
or to have a fixed @IP. The
AP sees 2 bits, the telegraphic network
(with
the catch RJ45) and the wireless networking (WiFi).
I observed that with the DHCP,
I haddéconnexions
WiFi, which was
solved when I passed in IP
statics (@IP allotted manually). This
solution is not
certainly not the good one. My
material: WRT54G and DWL520G,
éventellement
with a USR2249 out of repeater.
"ex_machina
"
provided an explanation which plait me well:
“For the
disconnection every 10 minutes: it is
in general
with the fact that the PC
is in “automatic”
address IP, in other words the PC goes
to ask an address IP
with waiter DHCP of the modem.
This waiter “lends to
him” an address IP for a lease of
10 minutes.
Beyond that, the PC must Re-ask a new
address IP.
To do that ports 67 should be left
& 68 open in
UDP (that is regulated in
your firewall) because if not the PC
cannot require/receive sound
addresses IP
and thus it cannot be connected any
more to Internet =>
disconnection.
"
Under Win98, duration of the
lease obtained
post yourself with
“winipcfg”.
The address Can IP, it be unspecified?
It @ held there:
127.0.0.1
(“localhost”, which wants to say
“myself”)
10.0.0.1 with 10.255.255.254
172.16.0.1 with 172.31.255.254
192.168.0.1 with 192.168.255.254
who are interpreted by
materials network to ensure
function particular. For
example, by convention, one
give 192.168.0.254 for one @ IP of a router.
@ the IP are selected in ranges of values, which are programmed in waiter DHCP.
@ the IP are sold by an organization (internic). To make economies, those which achété @ IP make use of it for to be identified on Internet, and, “mask” one sub-network behind these @ IP. Thus the sub-network can accèder with Internet. Ca is called the NAT. I would speak again about it.
Yes, but I did not buy d'@IP
me! , then?
Ben the supplier of access to Internet
(FAI), him,
bought
@ IP.
It is what a mask of sub-network (“subnet mask”)?
It is something which
expresses the size of under
network and
which is the range of its @ IP. Bytes
(or bits) of the mask
who are to 0, correspond to @ possible of under
network, them
bytes (or bits) to 1 correspond to what is not
not under network
(outside, Internet). The
1 is on the left, them
0 on the right
Example: the 255.255.255.0 mask,
expresses that under network
can possèder 254 computers (the 0 and the 255 are
reserved,
thus 256-2=254)
There exists another notation
of the mask, added
with @ the IP: ww.xx.yy.zz/NHere, NR means the number of bits with 1.
For the 255.255.255.0 mask, NR is
worth 24.
One applies the mask to l'@
destination, for
to determine
towards or to send the packages of bits.
The interest of the mask is to
identify if one @ IP of destination
is under network or not. If
the destination is
in
under network (even bit), one sends it
directly with the ordi
recipient, if not one sends the request towards the ordi which is
connected
with Internet (footbridge).
How to identify the computer which is connected to Internet?
One affects one to him @ IP reserved which is made for that, this ordi is called footbridge or “gateway”. For example 192.168.0.1.
To have one addresses IP, that is enough?
Not, to post this page, you
did not type d'@
IP (well
that functions), but “HTTP: //yves.maguer ......”,
there is thus a correspondence which is made. This function
be called DNS, it is ensured by a waiter DNS. Le
waiter
DHCP can also configure the values of DNS.
If a machine is present
(reachable) on
network with
the order ping (said “pinguer”) by its @IP but
not by its name, then there is a problem of DNS.
There are more qualified
people whoexpliquent
all
that better
that me.
Explications
with captures of screen (Windows 2000).
Les routers between FAI are localised in Paris. This increases the ping in province and limit unnecessarily it flow with Paris and especially the flow province-province.
Les Can AP go on the roofs without problem?
NOT, the AP are conceived to
be
used in interior (with
this day). There are 2
problems with
to solve: the bad weather (rain,
wind) and the temperature. With
the temperature, my
AP, a USR2249,
broke down, there was in the history: “AP card
die ".
After placehaving placed it in front
of a ventilator, it
east went back to
to function. I thus
realizedune
turn of refroidissementplacée on the roof, for
he. Ca it
also protect from the rain. I
do not have fear for
cold,
because it consumes 4W and that is enough with
to protect from
cold when it functions.
The short period of omnidirectional
aerial which exceeds
large
tube, is enough to sprinkle all the house (2 stages).
With this installation, the heat wave
does not have it
géné!
Good, and then I have a second
USR2249, much
more
apprehensive, which goes badly even to 30°.
I explain:
While launching navigator Internet to
go to
config. of
the AP, in the mitre “status”, it sometimes posted
there
Wireless MAC:
00-00-00-00-00-00
And there, it does not make any more connection with another material wifi. (the luminous witness of the medium does not flicker of way variable).
Solution: (do not laugh), you disconnect it to you put with the regrigerator during half an hour, you replug and it remarche until one cuts to him the 220v.
The AP WRT54Gsemblent wet
cold being sensitive. Locked
up
in a box seals of electrician (example:
Boitier PLEXO
Legrand 920 62, 220 X 170 X 86 cm, approximately 20
euros),
with at side or below the AP, one
heating, regulating system
of temperature (between 10 and 20°C) (thermo plunger
of aquarium in
driving position with a diode in series on
food
220V (1N4003 with 1N4007), lamp of terrarium with one
thermostat,
heating cord with thermostat), it seems to me that
would have
to go. Attention
external cables (especially
in 220v)
do not have to move under the influence of the wind.
According to the thermo isolation of
the box, I think that a heating
from 10 controlled Watt with 10°C
would be enough. The AP
heat already
of 4 Watts constantly.
If not, certain AP conceived to
function in
outsidecommencent
to appear at DLink. D'
others
ici.
Les
waves
they is bad for health?
OUI, it is clear! On the other hand it should be known that it vient
some
du
cosmos since the ground (and the human one) exist.
Thus all is question of quantity.
Quantity
received (power) isinversement
proportional to the square of the distance
(surface
of a sphere according to the ray: S=4*PI*r²). With
equal surface,
the more one is near, the more one collects waves.
I applied following
calculation: radiation
receipt =
Power of the source/(4 * pi * distance * distance). For
powers considered following:
relay television: 1000Watts,
transmitters FM: 1000Watts,
satellite: 1000Watts,
relais GSM: 100Watts
telephone GSM: 2Watts,
microwawe oven (power which escapes):
0,2Watt
WiFi apparatus: 0,1Watt,
WiMax: 20Watts.
The fichier
is disponible,
if you want to test values.
Before criticizing WiFi, suivez
these recommandationsconcernant the cellphones.
For me the essential one is: To
always use the pedestrian kit delivered with your telephone.
Thus, you will pass under
the red bar of the graph above.
I regret time or the cellphones had a
connector for external antenna…
For the weekend of Easter,
here smallexpérience
to be tried with an egg and 2 cellphones.
As je
do not know if it is a blague,
if you made the experiment (far from a transmitter (power
maximum of the telephone) and with a background music to force
the emission), tell me…!
With the case or it would be true, one
can understand that our brain
“cooked” not when one telephones, thanks to the
blood which
control its temperature.
Followingl'
business of the 40 employees out of 100 of town hall who have a headachedepuis
that there are WiFi terminals in the public libraries of Paris, I
indicated inrougela
limit corresponding todégats
irremediableproduits by the waves (zone delimited by one
chain yellow and black, to prevent the access
physicsderrière
antennas GSM (with less 50cm)).
Then, why the cellphone with 1cm, is
not
not declared dangerous, whereas it is above
bars red?
Because it does not sprinkle all the
human body, like does it relay GSM with 50cm.
On the other hand, it was confirmed
(seen on France2,
20h00) that it had effects on parotid gland, placed
behind the ear which is used to telephone.
Indeed, one sees that for
the other ear (other
side of the brain, with 17cm) the radiation is
relatively weak (below the red bar).
"Le
brain, the parotid gland and the auditive nerve are, indeed, among
fabrics the most exposed to the radio frequencies during
the use of a cellphone."
"Pour
what is brain tumours nothing is still proven
however it is noted that: at people reached of tumour with
brain, among those which have a portable,la tumour is more often located
2,5 times on the side of the ear which was used.
" CQFD.
Does
psychiatrist cause??
My freebox is posed on my cathode
screen, since
years, therefore with 80cm of my head, and I am well,
thank you.
Is necessary it to apply the
precaution principle BEFORE having made
a study placébo?? B2Lanoë
sliced; it is
not.
For me, it is YES, considering the
existing studies before the facts and
the massive use of the wifi. (good,
for 40 people one can make
an exception, that made pleasure and that costs anything
(political principle?))
I met 2 employees of town hall which
one says to me to have a
headache, all 2,
at the end of 10mmnderrière of the antennas,
and I have believed them, without problem.
Circumstances: on a tower
water, truffé of antennasGSM,
with panels and a chaine (yellow and black) which indicates
limit (50cm) with whose the waves cause
dégats irremediable.
Then the 40 employees of Paris are, in
my eyes, of
..... large
communicating. Let us
await (12/2007) the result of
the study nevertheless.
It is interest of the operators of GSM
(which are
intended on their respective market shares) to maintain
confusion between harmful effects of telephones GSM
and effects of WiFi. Do
not play their game!!
Still quite good which makes me well
laugh: the installation of brouilleurs
GSMdans hospitals.
Then one prohibits the portables in the
hospitals for
to preserve the use of the medical device (and
perhaps patients, know). For
that one places one
apparatus which emits more extremely (principle of jamming). CQFD.
You have a headache with the cinema??
Consequently, I do not
believe invalidity
of
this study which would like to reassure us. Because
I doubt
that this one measured with 1cm (distance
antenna/brain) it
radiation of each one of our telephones
portables.Manque
of independence? (Of
the testers of
cellphones have
have problems of memory (memory
in the short run; or I have
parked my car?)).
Téléchargez
the passage TV of Richard Forget at Laurent Ruquier
(“It
black file of the portable ", that made 32méga, but
that
the blow is worth!! that
makes me think of the share
media which disputed the warming (
half) whereas no scientific study it
disputed. (See
“Une
truth which disturbs", Al
Gore).
When adorable Virginia asks Richard
Forget if it
WiFi
it is similar, it answers “yes”. I him
rétorquerais that one
is not stuck the access point to the brain… (see
table
comparative above).
Harmfulness comes especiallydes
telephones
themselves, less of the antennas which are on
roofs.
The proof, this study which shows thatça
break them
bits of DNA.
the WiMax terminals make 20
Watts of WORSE,
the transmitters FM make 1000 Watts,
relays GSM make 100 Watts (and there
are people with whom one has
nothing asked -étude
in Marseilles, qui
live just opposite
Les relais GSM
become relays UMTSsans respect of
procedures.
the satellites make 1000 Watts (but
they are loins, with
36000km),
telephones GSM make 1 to 2 Watts (et
one them
stick to
cerveau) (use the auricles or the textos). More it
telephone
is far from relay GSM (en
campagne) more it emits extremely (
power is adjusted).
the wifi makes 0,1 Watt,
my microwawe oven (with same
frequency) disturbs my
connections wifi in the house, therefore the furnace
“sprinkles”
also the house, in spite of its shielding. Old man or nine, it is
similar. Therefore I have
him affected a power
(0,2Watt for the escapes)
higher than WiFi.
I do not have information on the téléphones
without wireque one
place systematically with the ear. However,
consider that
the terminal (bases) with which they dialogue, is close (10m).
Thus the need for puissance
to join the terminal (bases) is
faible (compared to the telephone
GSM, for which the terminal (relay
GSM) is with 100m or 1Km or more).
So that a WiFi connection functions, it is enough that received power is of -60dBm, i.e. 0.000001 MW (1E-09 on the graph), or thousandths of micro Watt.
The ARCEP with ordered a study
in Supelec onpuissance
of WiFi; result WiFi isbien
in dessousdes
authorized powers (decree n° 2002-775
from May 3, 2002).Voici
the study (12/2006).
A cellphone under continuous operation
posed on
eggs out of incubator, produces 6 times more death
at
chicks (considering on TV).
This stronger sensitivity for the
organizations in the course of
development
(our children),semble
to be confirmed here.
A chicken stockbreeder, saw his mortality to increase suddenly with the appearance of an antenna GSM with proximity of sound breeding.
It is notoire
that
children of
people who work in the medium of the hyperfréquences,
are often FILLES
Influence
on the eyes of the waves emitted by
cellphones:
"
- The cornea exposed during a time
prolonged with this
radiation presents macroscopic damage affecting
quality of the vision. The
damage increases with
accumulation
exposures and reached a culminating point at the end of some
days (192 cycles of exposure). As
of suspension of
the exposure,
the damage tends to regress.
- On the microscopic level, other
types of damage are
noted. Small bubbles are
created
on the surface of the cornea.
They are directly related
to the beam microwaves and
are
not the consequence of heat
generated in the cornea. However,
contrary to those caused by the increase in
heat, these
damage is irreversible.
"
In any case, as long as one will not
have, in France, ofinformations
exhaustive on healthdes individuals, one
will not be able
to extrapolate what occurs for 62 million people in some
month or years, with consequences
more serious for
thousands of people 40 years afterwards. See asbestos (100 000
died to come), radioactivity, etc…
Un
beginning of statistics with Cmap.
Unless the statistiques
ones
do not come from the individuseux-mêmes? (
http://electrosensibles-victimes.be/
Une
tenant who
known as to suffer from electro-over-sensitiveness
bound to the antenna-relays,
in justice its financial backer attacks
And the role of the frequency? Ben, more one
bring closer to the frequency
of resonance of water (70 _ of our body) more one heats
our body. This is typic
WiFi telephones.
Dilemma, one is today with50V/mpour mobile
phones. According
to
Denis Zmirou, (ex
scientific director of the AFSSE) with0.6V/mon
could more
to have modern communications (include/understand with a flow
bytes of disont (that engages only me)… 1méga
bits by
second). comparatif
of the powers of the cellphones (11/2007).
I benefit from it to recall that the réseaux ones
with a grid use
less power (to voir
Femtocell) that “dorsal” structures,
since one does not state that with closest (more
easy to join).
And I give a layer from there: antennes
directionnelles,
precisely, sprinkle only that towards which they point.
Thus each one is not pas
sprinkled by its own material, but
by
that of the other. I
exaggerate a little because there are lobes
parasites, but in the principle it is that!
Une proposition
of loi (several parties) is in hand (09/2005).
There is WiFi
in the hospitals...
How to detect the radio waves?
For 20 eurosje
am to me
bought a multimeter
who makes measurement of capacity. On
gauge PF (pico Farad),
in
placing a wire of 3cm on an entry, I
detect it
radiation with1cm
I have say “I
detect”, I do not have say”je
measure
Here the field intensity measuring
device (or field-meter, or
wavemeter) that
I manufactured (thank you F1SXO to have provided me the diode1N21C
The value read is of 100mV to a few
centimetres
antenna
omni of my USR2249 or my WRT54G (with a “beacon
interval " of 1ms).
A un
meter,
at equal distance from the 2 antennas (the maximum), it
remain10mV
Last weekend (12/2007), I was invited
at a personen ville,
to detect the background radiation.
I found (with this same apparatus)
points with 15 or30mV on
the balcon, and of the values of 3mV in all the apartment
At home, and people whom I know, there
is, inside the
dwelling, 0mV, zero milli volt, in normal conditions.
How
to put the mini-NCV of D-LINK DWL520+ in a toshiba
satellite?
D-LINK DWL520+:
The same open one:
One tears off (or one
déssoude) the cable
side mini-NCV. Under
PC, one finds 2 wire (white and black) with connectors. These wire
make will 800microns diameter, and they are the coaxial ones which
go
on a connector U.FL:
The white wire is cut and one welds it
in the place of that which
one removed. Heuu…
it is not with
carried everyone,
parkinsonian, to abstain from!! (I
acknowledge being with
limit of what
I can make in the field) I
point out that it is necessary to weld it
shielding (with the mass, one of the 4 holes in square) and
the heart of
coaxial (with the central hole).
Here what that gives:
One will take care to fix the black
wire (with adhesive tape)
to avoid risks. This
white wire is
connected to an antenna
inserted in the chassis of the PC. It
gives
very good performances,
better than a pcmcia.
I very did not
include/understand but there are charts which have
already
connectors U.FL, all is then simpler!
How
to add a connector on D-LINK DWL-650+?
D-LINK DWL-650+ seen of top and lower
part:
The chart opens while cutting the
plastic with the cutter, on the edges.
Then, 2 metal stems on
sides slide slightly
and the 2 hulls release.
I placed connector (female SMA at
to weld) (more running
is the female RP-SMA) with horse on the circuit
printed, in manner
to use the plan of mass to connect the mass and to ensure
la
mechanical rigidity of the connector. I have
connected the central stud
connector (on other side of the circuit
printed) with the hole which
is in the middle of the formed antenna of 2 spirals.
To weld the mass, it is necessary to
scrape green varnish on 1cm
square
so that all the length of the 2 studs of the connector, is
welded
(better mechanical resistance). Here
it
detail side
welding of the central stud, I used a leg of component
like wire:
The same principle wasappliqué
on a DWL-G650, except that they welded
directly the cable
on the chart.
Others put petites
omnidirectional directly on the chart
Me I would advise rather, for
reasons of
resistance
mechanics, to do that:
by putting a wire for the red feature,
by welding the connector
at the blue points and while crossing, possibly, with the feature
purple.
With WiFi is what I would be pirated?
"Le only case where you can break
the key
pre-divided, is if it belongs to a dictionary or if it is relatively
short.Réciproquement,
if you want to haveun
unbreakable wireless networking at the house,
the use ofWPA/WPA2
and a password of 63
characterscomposé of
charactersaléatoires
including/understanding special symbolesest
necessary."
I consider that a key which needsdix ans(with the
computers of today, out of grid) to be broken, isincassable
You can calculate yourself here the
time necessary:
http://lastbit.com/pswcalc.asp
We
are 6 billion on
ground, some
pourcents has a computer on Internet, among these, 1 out of 10
thousand is malicious pirate which want you evil. This made
that there are a few tens of attacks per day on your
computer if it is always connected to Internet.
Good.
You put of WiFi in your computer, to
date, you
go
to find some other computers on WiFi. Ben me I you
say that there are few chances that your “neighbor”
is one
unpleasant, malicious pirate. Thus
to connect itself to
Internet is
much more dangerous than to make a WiFi network.
And risks it for the attacker is not
the same one, if it is
to 10
minutes with foot, that if it is at 10 hours of plane.
For
information, if you have one
repertory
divided under Windows, you give the means to
the attacker (given)
to erase your hard drive, via Internet. A fire wall (firewall)
is a protection. You can
put the fire wall for you
to protect
WiFi network.
I use “tiny personal
firewall 2.0.13”.
In addition, if you use antennas unidirectionnelles, will piratedevra is to betrès near you (because of the parasitic radiation around your antenna), is to be in the beam of the waves (which will be with plusieures tens of meters height and which fact some meters of ray), is to betrès close to the point distant.
D' another side,
those which are interested in
new technologies are of a curious spirit. And with it
titrate,
those which could make a connection wifi with you, have one
atypical profile…
Software (EtherPEG
(MAC)
Driftnet
(LINUX/SOLARIS)
) allow to voir
directly with the screen, the images which
pass on a bond
WiFi (if it is not protected). Other
possibilities
under
Windows.
There exist CD
bootables (Knoopix/Unix) which contiennent
tools for testervous-même
secutity of your network.
A total solution atImmunity(08/2006)
The pirates (or
apprentice-pirates) attack the maillon
le
more faibled' one system. Today
it is it
WiFi (not
for technical reason, but by ignorance
utilisateurs, because majority of the points
access
does not have or little protection).
There exist also failles
WiFi in MAC (Apple)… not? … if,
if… (correction
Extreme Airport
Le pilote Linux
MadWiFi is vulnerable to the attacks (04/2007)
The filtrage of
MAC addresses does not protect you, since
that one can simulate (one “spoofer says”) any
addresses MAC with certain materials. And like in addition,
the address MAC of your AP (and those of the computers which
connect above) is diffused by the AP, the pirate lays out
of
all elements to be made pass for one
computer of
your network.
Le WEP
is not worth any more
large chose today, because it is enough
the quelques
ones
minutes of listening (secondesau
08/2006) to break a key of 128bits, with one
flow of
data sufficient. Tools of
attack (wardriving)
name kismet, airsnort, aircrack weplab, wepattack, and
some combine a rough attack and an attack by
dictionary. Voici
a list of logiciels.
"au
not to deserve the nickname sometimes ofWeak Encryption Protocol
Certain people believe
themselves in the shelter
pirates inne
not diffusing (broadcast) the name of their network (the SSID).
It is
a weak protection, since it is enough to attaque by
dictionary on SSID to find it.
In the same way, the fact of not
diffusing the SSID,ne
mask not your
network of the pirates. The
pirate sees that you
emit, and he sees
that you hide your SSID. (provocation?)
attaques the passives
(mode
monitoring)
do nothing but listen to your AP, it thus does not have therestrictement none
trace your side, of these attacks.
I personally capté
a APnormal (without modification of the antennas)
placed on one
balcony,à 10Km.
By definition, these attacks do not do
anything on your machine,
they aim only tocapturer
your
data.
Les attaques activeobligent
le
pirate to be emitted (for example for
to make allot one @
IP according to its @ MAC). Thus,
DHCP can help the pirate.
These attacks can corrupt your data or
your
system,
but they are detectable.
I know people, whose pleasure
is to go to see in
repertories shared (by Windows) of
Net surfers (thus even
without WiFi) which does not put any protection.
And then a key of 8 bits (a
character)
breaks into 255
tests (attacks rough), therefore if you put a password too much
short, it will be always fragile.
In the same way, if you choose a word
of
passes made up
current words, an attack “by dictionary”
will findfacilement
this word of passe, some is your mechanism
of encryption.
Against this, use characters
generated by chance.La
difficulty
is to memorize them!!
KeysRSA
of 1024
bits should be used until 2010et keys RSA of 2048 bits until
2030, to preserve
a good protection.
To my knowledge, encoding (in
2008) is based on the fact that if
I multiple 2 great prime numbers P and Q which give NR, it am
very difficult to find them, if only NR is known.
Let me be delirious a little.: I
calculate a value
N=P*Q (P and Q two prime numbers of at least 150 digits)
If a key (NR) is that which I
calculated, I
know P and Q instantaneously (the time of a research in an ordered
continuation).
Probability that an unspecified key, is
that
that I calculated is weak, but it exists.
Now, with a large machine (or several
distributed)
and
a large base of data, I calculate
des
billion values NR and I memorize P and Q.
Probability that I find a key
instantaneously (research in my data base on criterion
length
or figures of left of NR) increases…
Especially if it is known that one
should not use P or Q with less
150 digits under penalty of brittleness with
methods
traditional…
My database will be consultable on line
for one
moderate
… hein summons?? that
made fear? not, I am
delirious!!
(05/2007)
Microsoft found a solution for to memorize the large keys: (WCN) key USB. It is why ZyXel propose material with a catch USB.
The Wi-Fi
Alliancepropose
(at the beginning of 2007) itWPS,
for simplifier the setting in
work of
encoding in Wi-Fi
For that which can touch the material
physically, seizure
of a simple code PINE or even support on a button.
For that which has access only by the
waves, gross
key of the WPA2.
Another solution, with the test
(03/2007),avec
SIM chart, at SFR with Defense.
I quote (in 2003):
All in all, per hour of today, a wireless networking in 802.11b presents only little of safety and little to be easily pirated, this is why networks without wire are still a danger to the companies. Of course, it is possible to add a safety higher around with in particular the use of VPN/Ipsec, of the standard 802.1x, Firewall, but well little companies are aware of the dangers that they take by installing this kind of material and do not take thus not these precautions.
Fortunately a “substitute” of the WEP is being studied, it acts of the WPA (WiFi Protected Access). Its operation is based on one system of exchange of keys dynamic, renewed every 10 KB of data, this process is called TKIP¨ (Temporal Key Integrity Protocol). According to the manufacturers, it will be possible of upgrader Firmware of your material 802.11b to integrate the WPA. This new process should improve appreciably the safety of the wireless networkings, only flat, the algorithm used remains unchanged.
isecurelabs.com
source,
to see 802.11ipour
evolution of the WPA.
Various apparatuses supportants
le
WPA2
Une mise
up to date of the WPA2 for Windows XP (the patch: KB893357
The WPA2
is aujourd'hui
(03/2005) meilleure
protection in WiFi, good. L'Alliance
Wi-Fi makes compulsory the WPA2
A la grand' mass of the pirates and
hackers,
(22nd European Hacker Conference at the end of 2005 with
Berlin, 22C3,
Chaos Communication Congress) 3845 attacks did not come
with
boils of the WiFi network ofAruba,
and that during 4 hours. A
first!!Idem
in mesh.
WPA2
= 802.11i = protocol CCMP + authentification 802.1x (or key
divided) + coding AES
WPA = protocol TKIP + authentification
802.1x (or
divided key) + coding RC4
WEP = protocol WEP + optional
authentification + coding RC4
It would seem that protocols
(WPA/WPA2) not using not
of divided key
are more
difficult to break
(09/2007).
Voici ma source
of information, and translation
French automatic.
But, it would come you to the idea
from you
to connect to Internet
without fire wall or antivirus?? not
(I hope for it).
You know that today a
“contaminated” computer
by a virus, spyware, (and other tricks in “.ware ")
can diffuse (without WiFi) with its author what you have
typed with
keyboard, for example? (the
worm is in apple)(les
banks
react).
Thus for WiFi, as Internet, meilleure
safety
is that which you mettez
in place yourselvesWiFiRadis
Do not offer to the pirates WiFi, the
protected part
(LAN)(by
fire wall) of Internet.
I thus share the point of view of
ozone, which crypt not sound
network
WiFi in the big cities. However,
their access Internet
is
constituted of a dorsal which does not seem accessible to
private individual (5GHz). See
attack “man-in-the-middle”,
le
pirate is made pass for equipment which normally
you
connect to Internet.
To avoid that, CISCO, put in its AP
and theirs
customers of
functions of monitoring (WLSE)
who listen to and defer the arrival again
WiFi material
in the coverage area of those. This
function
of listening
also allows to locate (with a minimum of apparatuses
equipped)
the materials non-WiFi, with an aim of removing them
interferences.
Thanks to a centralized
administration,
one can then adjust
powers and to affect the channels to optimize
radio coverage.
Attention with the traps, when you
surfez with
your PC
WiFi portable in the street, of badly intentioneds people
install
“hotspots
hooliganspoints
pirate accesses) which immitent them
truths, but which enables them to collect your data
confidential of connection.
Thus do not give your Bleue card
number for you
to connect to a hotspot, buy a chart rather
prepaid.
To hide its data,il
there the VPN hascroissance
of 23 _ ventes in 2004) (idem
in 2006
Le point
of sight of the Befti
(Brigade of
investigations into the frauds
with
information technologies)(05/2006)
the VPN, la solution for the safety of WiFi?
the VPN
it is what
Google
propose
VPN for its hotspots
WiFi
a page of entreprise on WiFi.
a réseau semi-public, conveyed by Internet; completely hermetic Internet has
a “upgrade”
for IPSec on OS W9x and NT4
With OAPI,
Trapezoid wants to centralize the management of the access points.
According to
me, if safety is not with go,
it is the door
opened withvirus
WiFi (WCS) . And now (01/2008) that bears a name, it
“WiFi
Flu
Failles
and patchs at Wintel (Windows+Intel) on the wireless
telegraphy. (charts PRO/Wireless 2100,
2200BG, 2915ABG and 3945ABG) and their software of administration
PROsetSee the software Bad_Seed
La
safety gives reason to the purists,
thus OpenBSD
(UNIX), which does not use
pilots whose only binary ones are available, is not
concerned with this kind of fault.
If
you want trier
gentils
users of your WiFi terminal, bad, it is enough for you to
their donner means
to join to you
You can do it while giving as nom on your WiFi terminal(field
SSID) ,
your email
Thus,
any user
of your terminal which will not have sought with
you to join, will be equipped with bad intentions.
It
is necessary for you to activate
the option which consists in diffusing this name (broadcast
SSID = yes).
The frequency to which is diffused
this name (beacon interval)
is programmable (of 1ms at one minute, in
general).
A too low value will collapse your
flow.
A too high value will return to you
statistically less visible
occasional users, while being visible by
your
neighbor, who is to him longer with the listening of
your terminal.
Under these conditions vous
can observer, with AirSnare
(downloadable here) (which uses if
necessary Ethereal) les
users who
connect themselves to your access point (some
that is to say their OS (Operating System)),et
their to send
messages (if you and they, use Windows NT, 2000 and XP
(order
“Net send”)), oubien to prevent the guards, vigils,
by
email automatically.
To go further, vous
can locate the pirate (by
triangulation) .
You must be equipped with an antenna
directional and to collect it since 2 geographical points. With
each point, you raise the azimuth ofla
WiFi connection of the pirate and
coordonées GPS of your position. By chart
geographical or
by software, you deduce the coordinates from them
GPS of the pirate.
The 2 points should not be
in the same axis
that it
pirate, ideally the 2 azimuths are perpendicular.
If the pirate uses an one-way antenna,
it you
will be necessary to approach you him until you find one
azimuth from which the angle is suffisament different compared to
first. Indeed, a
directional antenna always emits
one
little around, one calls it that of the parasitic lobes. If it
is
in a building, you can change the polarization of
the antenna, to locate the stage more easily.
The more directional your antenna is,
the more the localization is
easy.
A manufacturer (Intel) exploited the
travel time
of
the radio wave fordéterminer
the distance to one or more AP.
In the case of an only AP, one can
thus thus use the distance
with the AP to prohibit the access to a.
In the case of several fixed AP, one
can inform each AP
on its own physical coordinates
(coordinates GPS).
When a mobile computer is connected to
the AP, it will be able
to deduce
its physical coordinates by triangulation. According to
la
precision of the system, it becomes possible then
for the system
of security management, not to authorizeconnexion of
mobile, that for certain geographical areas
data.
Source
Un
article on the safety of WiMAX
(01/2007)
How to improve a WiFi connection?
A
WiFi bond is a bond bidirectionnel (by
opposition for example, with a radio operator bond between one
transmitter
TV and your TV).
One thus needs that the link between
you and the other are made, ET,
the connection in the other direction too.
Here a diagram of a connection in only
one direction:
The units in MW and dBm are absolute, them units in dB and dBi is relative. One can add uneunity indBm, with plusieures units in dBi or dB together.
An antenna has strictementles
same properties inémission
that in réception.
Only one measurement
characterizes amplification with
the emission (profit)
as with the reception (profit or
“sensitivity” according to
some) it is about measurement of the dB or dBi (profit in dBi =
profit in dB + the 2.15) (salesmen pushed us with
to use
the highest unit; -)
What I call a “large
antenna” has a profit
raised,
a “small antenna” has a weak profit.
The legality of the installation is measured in “AIR”, on the public highway.
In this diagram,1est the transmitter,2le receiving. The profits are green, the losses oranges.
PUI1: power (in MW or dBm) of
the material WiFi (AP
~50mW,
chart NCV, PCMCIA ~30 with 200mW, key USB, boitier
USB, etc…),
AMP1: power of a possible amplifier
(dB),
CON1, CON2: losses (in dB) in the
connectors of each
side,
CAB1, CAB2: losses (in dB) in the
cables of each
side,
ANT1, ANT2: profits (in dBi or dB) of
the antennas,
AIR: they is the losses (in dB) in the
air or the obstacles,
SEU2: threshold (in dBm) of the
receiving material, varies
according to
quality (disont -94dBm for a flow of 1Mb/s
for material
running),
MAR1>2: it is the margin of remaining power. If it is positive, the connection goes in the direction 1 towards 2
There, one made half of the
way. For
that the Wifi bond
function, it that connection 2 towards 1 walk too.
One realizes that there is a part
common to the 2 connections.
It
acts of: CON1, CON2, CAB1, CAB2, ANT1, ANT2, AIR.
Ca please say that while acting on
these elements one
acts onDEUX
radio connections (1 towards 2 and 2 towards 1).
Ca please as say, as while acting on
elements PUI1, PUI2,
AMP1, AMP2, SEU1, SEU2, one acts that on half of
problem.
In the same way, the use of
onepreamplificator WiFi
allows to remove the losses in CAB2.
Operation is the same one as that of
préamplis for
TV or the satellite, one raises the signal there or it is it
more
extremely, therefore close to the antenna.
The difference (and the price) between
a préampli WiFi
and those caused,
is that the préampli WiFi mustcommuter very
quickly for
to let pass the signal vers
the antennequand the receiver
becomes transmitting.
When the receiver becomes
transmitting, losses
in CAB2 (which
become CAB1) can be compensated in
increasing
power of transmitter PUI2.
To decide use of a
préampli,
compare its price
with the price difference of the cable (good or less
good) for
length which you envisage to use.
In short, if you want to put one
cable very long, put
a préampli. You
will be able, then, to allow you to use
a cable
of ordinary quality, i.e. with more
dB with the meter,
thus less expensive.
Attention with the abuses
language, certains
call amplificateur, an amplifier of
WiFi range.
These apparatuses make
simply repeater.
One makes twice
more distance with 3 apparatuses (that of the medium makes relay (DWL-G710)
)
that with two. It is all.
Many of other AP have already this
function
for a long time…
In short, the assessment is:
XX = PUI1 + AMP1 + SEU2,
YY = PUI2 + AMP2 + SEU1,
ZZ = minimum
of XX and YY,
Total MARGIN = ZZ + CON1 + CON2 + CAB1
+ CAB2 + ANT1 + ANT2 + AIR
According to the value of
“total margin”, there will be a flow
of 1Mb/s, 2Mb/s, 5Mb/s, etc…
It is this minimum which does
not seem to be
assimilated by the WiMax operators,comme
says it
Stephan, without tweezers; -)
Now that you very included/understood,
I muddle you!
Joker!!! For the materials which have 2
exits
of antenna:
If one has access to the low layers of
software which controls the hardware, one can use an exit
for the transmission and the other for the reception. And
there, you
known as “why make me”?
And there I answer you to try to respect the law (current). Explanation:
If I emit slightly (ANT1)
(limit of 100mW), but
that I have
a large reception antenna (ANT2), I would collect better
that with (small) the antennas of origin (ANT1 and ANT2).
Thus on each side of the bond, if I
have an antenna
small for the emission
(the antenna of origin) and large for the reception, I
could further carry that with the antennas (small)
of origin, while respecting the law: -)
Of course, one will carry
less far than if there is one
antenna
large in emission and large in reception.
But I have when
even made10km (see page
Toulouse) with
antennas of origin of my AP usr2249.
The disadvantage, it is that costs 2
large antennas with the place
of one, to make the same range.
Sylvain implemented this solution on 6Km http://www.wifiquercy.net/
Second joker!!!
For
materials on which one
can program the power of exit:
This idea (of_SebFLebrun) is
so good that I have swell not to have found it.
To respect the law and to use only one
antenna in
emission
and in reception, it is enough to program a power
of emission
weak.
Example: my material has a
power (PUI1) of
17dBm, with
the antenna of origin (3dBi) I emit with 17 + 3 = 20dBi (=100mW
of
WORSE).
I put there an antenna SD27 of 24dBi
instead of the antenna of origin
from 3 dBi.
To return to 20dBm, I must remove the
surplus of puisance
of
the antenna (24 - 3 = 21) with my power of emission
17dBm.
Thus I must emit to 17 - 21 = -4dBm
= 0.4mW.
Here some examples of range
theoretical for 2 antennas
identical:
One can to make a bad antenna “ricoré”?
Yes, of course! It is very easy, it is enough to consult certain Internet sites (Paris-Without-Wire for example) to find bad councils which will allow to manufacture the bad ones “ricoré”: - (
Ricorés of
Paris-Without-Wire make8dBi,
one
good ricoré makes11dBi.
To measure the dBi, one compares (with
netstumbler for example)
measurements with those carried out on an antenna
trade,
whose profit is known. In
Toulouse one compared in
a SD15 (13dBi). See also
it video "l'
antenna
ricoré for the null ones" ;-)
Ok, let us see rather how to
make good:
For one
ricoré, Lg/4 = 44mm and Lo/4 = 31 Misters.
A
to leave
of these diagramsil is necessary to interpret
outdistance “Lo/4”
(31mm) as being
defined betweenbout
antenne and:
- is itbord
(in bottom) de
the boite (if the connector does not exceed)
(see
photograph of my ricoré in the paragraphComment
a link long distance is established?
- is itblindage
metal of
connector (if the connector exceeds
inside
limps) (photo below).
The 31mm correspond to the central part
of the driver
(the heart)qui is not surrounded by metal,
and which, by
consequent, lets escape the radio waves.
It is the partie
radiant
The dimension of 31mm is critical, it
must be
realized with +-0.5mm.
This east coast related to the selected
channel. 31mm
correspond to
channel of the medium.
This coast also makes it possible to
adjust the impedance of
the antenna.
The impedance must make
50 ohm so that the antenna propagates
all
the energy sent by the WiFi material
(of which impedance of
exit makes also 50 ohm, it is standardized).
Regardez l'explication
in small “the Antennas - lines of transmission”,
“the ROS”. (This
site is a bible for me!).
For the same reason, you must usecâble
50
ohm (the green cables make 75 ohm).
The impedance of the cables is
determined by 1) the report/ratio enters
- the diameter external of the cable
exchange, and - the diameter
interior of the cable which surrounds it (shielding,
braid), and 2) it
coefficient of swiftness of material
insulator.
“Lg” is directly
related to D, it
diameter of
limp.Pour
one ricoré, D = 100mm and Lg = 175mm.
Also note that the distance
“Lg/4” (44mm)
is defined compared to the bottom (à
interior)
limps.
One can also cross limps it
to respect the distance
“3/4 Lg” (131mm) but it is less serious.
“It” was also said
to me that 1dB was gained if one removed (with
one open-limps) the small interior disc with dimensions
lid.
There is no problem to leave the lid,
it
do not heat if one even puts it at the microwaves (
frequency with 2.4GHz).
One can check the coasts (31mm and
44mm) with
fabulous
instrument below, which I named it
" gabaricoré "
The “caroparty”
consists in meeting around
beers,
music and limp of “caro” or
“ricoré” for
to manufacture antennas.
Thus not of
“caroparty” without
“gabaricoré”!!
Il has there T it reflectors onantennes grids SD27?
Certain antennas grids (SD27)
are delivered without
reflectors,
3dB then is lost. This
one has as dimensions 105 X 77mm.
This sheet contains 2 foldings. There are thus 3 parts of 105 X
27,
105 X 23,105 X 27. The
angle made 30° approximately.
Once folded the coast of 77mm becomes
65mm.
There are slits of 4mm broad to thread
the ends of
figure of the SD27 envisaged for this purpose.
Holes with 13mm and 76mm of the edge
are at the end of the slits,
for
to make pass the plastic ends before threading them in
slits.
An end of zinc goutière, cut
with
scissors, bored with
the drilling machine, folded with a board, kitchen table and
one
screw clamp.
And here is the trick:
Why
my compass does not work
well?
The needle of the compass is aligned
with the magnetic field
terrestrial. Thus in full
nature ya not of problem.
We use the compass beside one
mast of antenna, one
antenna. Those are out of
metal and they deviate them
magnetic fields
and distort the indication of the compass.
To
solve it
problem, there is a method:
I place myself at least a meter of the
mast
(and of any metal part)
between the point that I aim and the mast of antenna.
I point the required angle and I
locate
at the horizon what
is in the corresponding angle.
I arrange my compass and I place
myself behind
mast. I turn
my antenna in direction of the visual reference mark with
the horizon.
Et voila!
If you do not believe me, you check: you places behind the mast with 1 measure, you aim at the visual reference mark and you approach the mast. With 10cm of the mast, the indication of the angle moved of 10°. Perhaps that that does not make it if one aim at north, I checked for an angle of 45°.
<>Mais
the lightning?
What, the lightning? It is already
fallen on your
antenna TV? Not, Ben on
mine either ..... good
day! ;-)
Easy to say when one lives downtown.
The lightning makes more
dégats in the countryside that in
city, perhaps
because of the cables which are more
exposed, or perhaps parce
that there are more lightning conductors downtown than in
shift… I
do not know.
There exists lightning protector (or surge
protectors)
for WiFi which semblent
to be effective in the absence of impact
direct (when the lightning falls on the WiFi antenna).
I quote Didier Lebrun:
“Has Vaour, I
observed that the addition of
lightning protectors
fact of losing about 1 dB in summer. In winter,
I remove them
lightning protectors, because I noticed that they block
completely
the signal when it freezes and accentuate the losses per time
cold and wet. “
One
disconnects
the computer to avoid them
overpressures on the sector. Ca
it is the radical solution, but
the onduleurs seem
to be effective against which had overpressures
with the lightning.
In shift one disconnects also the wire
of
telephone.
I await experience feedbacks
on
the use
antennas incourt-circuit
continu (like the SD27 (0.7 ohm)),
compared to the antennas in circuit
opened continu (ricoré and
the omnidirectional ones (infinite continuous impedance)).
My subjacent idea is thatles
antennas in
short-circuit
continu has more chances of protéger
the WiFi material,
since the power due to the lightning can be on
directly in
mass.
Following the meeting (very
sympathetic) atJeanle
28/07/2006, it was to me
confirmed that antennas “short-circuit”
protect
the WiFi apparatuses which are behind (in
general of the WRT54).
The day consisted with, in one
the first time, to repair WRT54, by removing the component (the
diversity switch) which has
roasted by the lightning or the loads
electrostatic (ESD).
In the second time, one protected
WRT54 while placing one
coil (22 nanoHenry) on the exit. The
coil causes of
court-circuiter
low frequency currents and thus with
fortiori, loads
electrostatic which could accumulate.
Les manipulations
sont delicate, but accessible to the people
meticulous persons.
To this occasion I placed onecourt-circuit
on
an antenna
omnidirectionnelle (of chez
IRISAGRI), so that it is protected
like SDxx.
Since I had brought my
TOSmètre, it
was easy to check
conservation of the impédence with 2.4GHz!
Here thus the result
Of course, we confirmed that its
performances
initial were
preserved, by a comparative measurement in dBm (netstumbler).
Here interior of the head of
the SD27,
thank you Julien for
Grenoble.
Yes, I know that appears strange it
short-circuit… there is even
that prevents from sleeping; -)
, Make you with the idea go that the
signal high
frequency
propagate on the surface of the drivers…
Il is enough to look at the lightning venir to make its provisions!
En
measuring (software WLANexpert,
thank you “black Milan”) the provided
current
by the exit of the material wifi, one can deduce
the Rate of Waves
Stationary (TOS or ROS (Report/ratio of Standing waves) or VSWR).
This relates to only the materials
which measure this current.
Les
materials containing PRISM2 allow it (usr
2450)
Another implementation of WLANexpert
Another
way of
to measure the ROS, it is of
to make a tosmeter WiFi (ROS-meter wifi, tosmetre
wifi) (band
SHF).
J'ai carried out this
one (thank you
Erwin), the BAT62-03W is available at Radiospares.
From the PCB, I printed and stuck on
copper. I have
then marked with a screw and a hammer points
remarkable (corners). Then
I took off it
paper, it me
remained the marks then on copper. I
crossed to
cutter
to remove copper.
I welded components CMS (Component
Assembled
on the Surface):
You will notice the 100 Ohm (marked
101,10 with 1
zero
multiplicateur=100) welded in parallel for
to make 50 Ohm. One
all that in one puts limps, and here:
My wrt54g emits according to a variable
power.
A first solution consists in putting it
parameter “SSID
broadcast " with ONE, and the parameter “beacon
interval "
to 1 (ms) (minimum).
A second solution consists with
to transfer a large file
to force the emission to the maximum.
I validated the operation of the
tosmeter, in
placing in front
ricoré iron plate, then by removing it:
that influences
indeed on the ROS (normal, one re-examines the waves with
the shipper) (value
of 16 master key with 30mV and value of 400 master key with
900mV). The court
circuit on the exit gives a maximum value of 1.7volt then
that under normal functioning one with 400mV (with my
ricoré).
It now remains to me to calibrate it
with - is
antennas of
trade, - is references standard
ROS in 50 Ohm.
Hard,
hard calibration!!
Thank you in Laurent Mennecart (the
purist of HF) to have me
provides standards 50 Ohm Radiall.
Initially I twisted the wire which go
to
voltmeter (that avoids
to distort measurements when one puts the hand on wire).
With the standard, the value must make
0mV, it
was not the case.
With 2 resistances 100
Ohm CMS in parallel
(welded in
a standard connector NR), I had something well near to 0.
Morality? the CMS in parallel do not make 50 Ohm
with 2.4GHz!!
J'ai donc essayé
to have 0mVavec the standard.
For
that, I welded
a leg of component
on a point medium (the branch of reference)
to which I welded
a disc. I then folded
back the disc to bring it closer
of a plan of mass. Super,
I approached the 0mV, but
without
to reach. I arrived at13mV minimum
I
thus measured;
- the reference gives 13mV,
- a SD27 gives 40mV,
- my ricoré 50mV gives,
- my 50 Ohm CMS give 60mV,
- adapters of the type NR towards BNC
with nothing with the end give
100mV,
- same adapters with a stopper 50 Ohm
of
network éthernet
coaxial, 60 give mV,
- an open circuit gives 220mV,
- a short-circuit gives 240mV,
<>Attention them
“stoppers BNC”
well-known of (old man?) administrators network do not make
50
Ohm with 2.4GHz!! (see
above)
Also think that in diversity mode, if
an antenna (that which one
measure) walk badly, the apparatus will make use of the other (finally
it is
what I noted while disconnecting
second).
I can thus assemble the values of the
ROS according to the tension
read with the millivoltmeter:
Good, then one should not panic,
considering the percentages of
losses of power correspondents to the values of ROS:
4 _ lost for ROS= 1,5,
10 _ lost for ROS= 2,
25 _ lost for ROS= 3,
50 _ lost for ROS=6.
Un ROS
of 1,5est limit that fix themselves, in general, them
manufacturers of antennas. (VSWR
<1.5 for all the channels)
By principle (bridge of Wien, I
believe) only 1 quarter of
power of entry, passed to
exit (loss of 6dB).
Le Does WiFi, that grow bigger well?
Ben that depends, the anarchistic wifi grows bigger badly (with the OJ of Athens, “Il is then necessary to transmit the image to the newspapers… ", they drew from the cables in the night for to circumvent the saturation of the waves).
D'
another
side, it802.11s,
or 802.15permettent
it to extend the cover of the network
with
each arrival of a new user. It is what one
envisages
offaire in Toulouse, but with
a mixture of fixed stations and stations mobile.
Nos
intuitions seems
to beconfirmées by this articlede
Jim Thompson, followingce debate.
Then I put myself the
question of the bond between
number of
jumps and the number of connected nodes. As I do not have
found
the formula to calculate it, I started with
hand, for a network
with a grid with3
bonds by nodeCa
makes a standard structure “nest
of bee ". I colored with
3 colors, on the basis of
point central, black:
Attention,
put aside the unrealistic case or the ground is
dish,
that there is no obstacle and or the nodes are distributed
geometrically,ce drawing
is not one
geographical representation, but one
schémades
bonds, similar toceux
that I dessinaispour Toulouse, when one was not
not
many.
According to the number of
jumps, the number of nodes
evolve/move
as follows: (série1)
0, 3, 9, 18, 30, etc..
Sometimes one falls down on a point
already
colored. The number of
already colored points evolves/moves
as follows: (série2)
0,0,0,3,3,6,6,9,9,12,12,15,…,
after I have
decree!
Good, then I found that the difference
enters
values of série1,
increased as follows: (série3)
3,6,9,12,15,18, etc…, it is
nevertheless more
sympathetic nerve! ,
there are +3 between each!
I thus coded a program which enabled
me to continue (I
am
large lazy), here is the result:
I coded (red curve) X with the square
(X ** 2) just
to compare.
The white curve (of the number of
connected nodes)
evolve/move more
quickly that the square.
It corresponds (with a margin of few
things)
withy = 1.51 * x**2
Following an email of Jean-Jacques
Gaudoz, the exact formula
is: there
= 3/2x² + 3/2x isy
= 1.5* X * (X +
1)
Which become les then
limits of a mesh network of it
type?
The number of jumps, will determine the
travel time
of one
not with the other of the network (lasted of
“ping”).
If it is considered that the WiFi
networks which
distribute one
geostationary connection of satellite, have a ping
with Internet of
500ms minimum, and that for the play, or the voice on line, it is
a limit, then I will take the same value, 500ms.
Ca will change when constellations of
48 satellites are launched
in low orbit with 400Km of altitude (instead of 36.000Km),
but
one is not there yet…
In addition, the AP (of today) bring a
delay of
disont… 5ms
by node.
Before calculating, it should be seen
that to join “with dimensions”
network with the other, the double should be traversed,
number of
jumps necessary to go from the medium (black spot)
until one
“with dimensions”.
Thus 500ms divided by 5ms makes 100. One divides by 2 for
to go
from one end to another of the network, which makes 50
jumps.
One sees (!) on the curve that for 50
jumps, one can connect 3825
nodes
It is of course onelimite
haute, since a structure was taken
of network almost ideal and a maximum ping.
Obviously, it would be ridiculous to
give a connection Internet
single at the central point, because:
- the first three bonds would be
saturated,
- the flows available by user too
would be
weak.
On the other hand, to distribute
Internet in several points of it
network
seem to me to be a good project.
In addition, one could connect the
central points (black spot)
by a “dorsal” (makes a second network of it
(with a grid?))
to constitute a network
of networks
with a grid. The dorsal
then inevitably would consist of bonds more
long (goégraphiquement)
that those of the basic mesh network.
Bonds geographically longer, can
to be obtained,
for example, by the connections towards Internet (footbridges).
It is the solution
adopted by “Linux
PC
Services " (LPS). One
can then choose the way more
short (of many jumps) between the mesh network
only,
or, the mesh network/footbridge Internet 1/
footbridge
Internet 2/the mesh network. LPS
did it
choice to pass
systematically by Internet if the way in
mesh network
fact more than 4 jumps. I
call this solution of “pseudo-mesh”,
since one does not pass by the network mesh in ALL the cases,
to join 2 elements of the network mesh.
LPS uses AODV which
“innonde” its entourage; it is
thus logical to seek to leave the network
with a grid (by
footbridges) as soon as possible, not to saturate it.
M@dBox of LPS is equipped (04/2005)
with antennas
omnidirectional, which slows down its use with
countryside.
I do not know the detail ofsolution
of Luceor which it, uses OLSR.
Thomas, in Pomeys, provides us the
duration of
" ping "
in real-time, on its network.
How to find itself there in connectors?
Voici
a correspondanceentre the WiFi material (your
router (AP)
or chart NCV or PCMCIA) and its connector of antenna.
To indicate a connector there is in
first ittype
type N,
SMA
type,
TNC
type,
type F,
MCX
type,
MMCX
type,
UHF
typetype BNC
(not
of threading but 2 pins), et it
there
in has
others (photo exit of http://www.wimo.de ):.
Some are connectors (to be welded)
dedicated to the test of end
of chaine, example, it Hirose ms 156.
It is not conceived to be
handled
more than 100 times.
It
contains a contact which
cut the bond
towards the antenna, when it is connected.
It does not have machine element
allowing to maintain
connection, in short, it is not a true connector.
To indicate a connector there is then the sex:
If threading is interior, it is one male(M), if not it is a female (F)
Yes, I know, it is odd!
Then, it is necessary to
determine if it is “normal” or
“reversed” (RP,
for “reverse polarity” in English)
Pour un male,
if the center of the connector
is une
pointe, it is a normal
Pour un femelle,
if the center of
connector is un
trou, it is a normal
Pour un male,
if the center of the connector
is un
trou, it one is inversé
Pour un femelle,
if the center of
connector is une
pointe, it one is inversé
To complicate, when it is normal, rien is not said
Then, there are connectors which are assembled at the end of one cable (à to cable), others which fix on a sheet (à to weld, chassis), others which are welded onto printed circuit (à to weld onto circuit printed).
For the same connector with to cable, there can be several possible diameters of cables, it then is giventype of cable compatible.
Certain connectors have a pas of vis opposite of the time direction (Reverse ThreadedRT
Here, to indicate a
connector, it is necessary
to know all it
who is in red.
Some examples follow:
Connector
U.FL
to weld:
male type NR (to be cabled)
type NR female (to be welded)
male type BNC (to be cabled)
female type BNC (adapter)
male type RP-TNC
female type RP-TNC
female type TNC (adapter)
male type RP-SMA (to be
cabled)
female type RP-SMA
A pigtail it is a cable with a
connector of
each end.
For the cables, the RG58 is recommended
for
400MHzmaxi(thus not good for WiFi), the RG142 (until
15GHz) has
summer
retained by itfabricant
pigtails
What counts, it is the number of dB per
meter of
cable, with
2400MHz.
When I see all these pigtails proposed
without it being
indicated
their loss in dB at the WiFi frequency,
that irritates me….
Example the RG58= 1dB/m, LMR400=0.2dB/m.
Here some équivalencesde
diameters of cables:
diameter 10mm: RG8/213
‚
WBC400 ‚LMR400 ‚
Altelicon CA-400,
Belden 9913,7810
diameter 6mm:RG58/141/142
‚
Hyperlink CA195RW ‚WBC195 ‚LMR195 ‚Belden
8240/8219
diameter?: WBC200 ‚LMR200,
Altelicon CA-200,
Belden 7807
diameter 2.6mm:RG316/174/188
‚
WBC100 ‚LMR100A, Belden 7805
A table of correspondence between connector
and cables compatible.
End
of a myth on WiFi, them
walls, them
doors and windows?
Then
here, at home I have a AP
with one
WiFi antenna of origin on the roof (2 antennas in diversity mode,
one is coupled with one-way).
I have one
house with a stage. The
ceilings of the DRC and the first are
composed of concrete 25cm (massive).
With the DRC, I equipped my AP (as a
customer mode) with one
antenna
one-way (one ricoré). I
sought by
or passed
waves.
While
directing ricoré
towards the AP of the roof (with
through the ceilings, in straight line), I have a bad signal.
While directing ricoré
towards the door of the corridor, I have a good
signal, idem towards the windows.
When natural persons put themselves in
encadrure of
carry, the signal is less good.
Donc
le WiFi
do not cross the murs (or ceilings). WiFi follows the
doors, the corridors, them
stair-wells, is reflected on the houses
of with side, them
trees in summer. See “Affaiblissement (attenuation) relative of
radio signal
WiFi according to the nature of the obstacles (materials)".
The sitechronomicro
we gives values:
Material | Level of attenuation |
Not smoked thick pane | 1-2 dB |
Plating/carries out of wood | 2-3 dB |
Plaster partition | 3-5 dB |
Box of office | 3-5 dB |
Partition in verre6 dB | 6-8 dB |
Water (bottle/fountain/aquarium) | 6-8 dB |
Brick wall | 8 dB |
Ceramics tiles | 6-10 dB |
Stored paper | 10 dB |
Armor-plated glass | 10-15 dB |
Concrete wall | 10-15 dB |
Metal mirrors/preparings | Total reflexion |
Il
exists software for simuler the radio coverage in interior.
Des logiciels permettent
to simulate
cover of each AP:
Les
anti-WiFi paintings against the hacking, are thus inefficaces,
as long as one stopped not the waves which pass by
windows.
This can be made thanks to the
coatings
thermics
(transparencies!) who are used for better isolating the panes against
les
losses of heat.
For
to generalize, it is enough to imagine
house under the following conditions:
It grows dark, the AP is a source of
light, there is bouillard,
and the thick walls are mirroirs, the doors (not
metal)
are out of glass.
The problem to receive the AP is the
following: “Is what
you see the light? “; -)
The analogy with light is also valid to compare an antenna omni and an one-way antenna. You have a bulb of headlight of car (antenna omni), when you place it in the headlight of the car (antenna plain), the light carries much further.
Still
another thing, as long as I there
am, as much
the mode “diversity”
is not used for
nothing
for a bond long distance (>1Km), as much itaméliore
frankly the range in interior.
Thus before
to compare materials, check well that these
materials
allow the mode “diversity”. It is necessary notament that
these materials have2 antennasA fortiori,
exclude the materials which have only one antenna:
some
AP, boitiers USB, charts NCV.
Apart from this criterion, I did not
note
difference of
performances notable enters the current materials (except
perhaps
the threshold of reception).
If you choose AP, you can put one of
them in
infrastructure and it (or them) other (S) as a customer mode.
All the charts PCMCIA which I opened
had 2
antennas. I do not know
if all exploited the mode
diversity, but that would be nevertheless
astonishing that they
do not exploit the 2 antennas!
The large manufacturers who propose to
off-set them
antennas,
boitiers sell who contain the 2 antennas with
to off-set,
to use the diversity mode.
Le
principle diversity applies
only on
the receiving device at one moment T. Thus for
that your bond
either effective, it is necessary that each apparatus or
equipped with 2
antennas. See the chapter “Comment
to improve a WiFi connection?"
if necessary.
And why not 3 antennas for
each apparatus, as on
WRT54GX, for
to further increase the flow and/or the range?
My
point of view is
confirmed by this:
"We recommend thesis first MIMO-based products
to
residential users. There
is significantly better throughput and
arrange performance than conventional products in every box we
tested. MIMO-based has
better approach than adding third-party,
high-profit antennas but activates repeaters - it' S less complex and,
even with the higher prices, usually less expensive. “
source
I translate; one gains more
if there are more antennas, that if one
puts antennas at strong profit, or
repeaters. It is less
expensive and less complicated to implement.
Thus while waiting, start with 2
antennas of each
side of
bond:)
To still improve the profit
you canutiliser
a “flatenna”
to transform an omnidirectional aerial
into antenna
one-way (directive).
Arnaud (Alf92) nous
propose to make it oneself. one speaks then
“of antenna chocapic”….after the
“antennas
ricoré ", one can say that WiFi is morning; -)
Problem, I think that one cannot
assemble 2
reflectors on
the AP which have 2 (or 3) antennas, because of the obstruction
mechanics
reflectors…
Who will gain, the pair coppered (the wire of the telephone) or the radio?
MIMO
+ OFDM = 1Gb/s with 5GHz (the ADSL does not have which has
well
to hold!)
La montée
in flow of the networks radio operator Wi-Fi
continues (07/2005)
Radio techologies make it possible to
increase the flow further
(03/2007):
"WHDI
on the tape of the 5 Ghz emits, and can transmit
to 3 Gbps while using
the band-width of the 40 MHz "
What misses with this information, it
is the number of channels
(of 40MHz) used.
With my first course of electricity,
one learned to me
that the current
always circulate in a loop (wire outward journey and wire return).
In addition, a loop constitutes a coil,
and 2 wire coast
at coast,
constitute a capacity.
The capacity (condenser) is enemy
increase
of
frequency and
the increase in frequency allows the increase in
flow.
“The problems which our
customers encounter
Freebox are dependent
with too long or too short lines, or
disturbed,
even parasitized by a condenser placed
at the time in
telephone socket by the operator
history”,indic
Michael
Boukobza, managing director of Free
If you find a condenser (a capacity) in
one of
your
catches telephones mural, remove it!
It is the black
“animal” on the photograph:
Thus I am not astonished only the solutionsfilaires high bancne is proposed that hasde less in less privilégiés(vérifiez) (the telegraphic flow “56Kb/s” is accessible to ALL la French population), whereas themsolutions radiopour an equivalent flow, see themportée to increase.
The fiberoptic untilchaqueabonné is very expensive:
"se
amount withplusieurs
tens of billion euros"
Count yourselves, with2
euros per meter and per annum., et
up to 12 euros with
hiring…
Especially that FT would
like to adapt the monopole
fibre (option PON) , for ramasser
under as with the good old man temps (at the time of the
monopoly of
telephone) (c'
is
similar in Germany
To buy
1Km of coppered pair, to buy posts, to rent one
excavator
oubien to put antennas on its roof?
(copper is expensive
(07/2006)…
value of overhead lines the SNCF too!).
And noise of the power picks to make
the trenches
in
cities? And them
stoppers of circulation because of
work?
(le WiFi, it is L'ecology!
;-)
Le
filaire resist
well on the distances
courtes (less 100m),
as follows:
"En
matter of 10GE, wiring
copper in twisted pair on a distance from
100 meters,
as for the lower flows of Ethernet, goes
quickly to become reality.
This type of deployment will be officially validated
with
ratification of the standard IEEE 802.3an (10GBase-T), envisaged
for
the semione. It will have to exploit a wiring of
category 7 (standard
not ratified, but which made its appearance in the offers
des
cable-laying ships), which makes it possible to reach a frequency of
transmission
from 600 MHz and requires four pairs of copper, it
who
force to replace the traditional RJ-45 by a new type of
connector ",source.
The 10GE corresponds to 10Gbits/s, on
Ethernet.
In this case, a coppered pair is
equivalent
with a WiFi channel.
4 pairs with 600MHz are
equivalent to
2.4GHz, but on 100m
only.
One sees well on the curves
below that the améliorationsapportées
with the ADSL are done onles
flows and NOT on
distances:
WiFi
allows moreover
long distances…
See: ADSL
: eligibility with more than 5000
meters of a NRA
Which
is the form of the radiation of an antenna?
One calls that a
“owner of antenna” or diagram of
radiation.
omnidirectionnelles
antennas
(tube), in
driving position, send the waves with the same power
all around them, on the horizontal level passing by the antenna
(perpendiculaire (cross-country
race-whodunnit)
with the axis of the antenna (made up
of one or more dipoles end to end).
Here what that gives if youregardez the antenna over
(cross-country race-whodunnit):
It is what
is shown by the yellow curve. To
compare them
the shapes of antennas, one places the point corresponding to the
maximum profit
on the circle most external of the squaring, with
0 degrees.
For a unidirectionnelle
antenna,
les
other points (for each angle) are thus more close to
center,
and draw a geographical curve for which
one receives
maximum power.
The profit of the antenna is the
maximum power.
Example of an Yagi aerial (like that
of the TV herzienne (rake)):
Si
one place,
not perpendicular to the dipole, but dans
the same plan (Co-whodunnit,
rise) (one is placed at
side of
the antenna), there exists another diagram of radiation (of 0°
(in
high) with 180° (in bottom)).
Example of a omni 10dB (even plane,
Co-whodunnit):
You see that if you place the antenna
in height too much, you
will not collect the signal below, for this antenna. Others
antennas “sprinkle” also below, but with the
detriment
profit.
Example of the antenna roasts SD15
(even plane that the dipole,
Co-whodunnit):
Diagram of cette
antenna patch (9dBi) in copolar:
and in crosspolar:
Example of the antenna roasts SD27
(even plane that the dipole,
Co-whodunnit):
Although the antennas presented have
different values of profit,
the squaring of the diagram is the same one (only
the scale changes),
what makes it possible to compare only the forms (they are standardized
curves).
Example of the SD27 in cross-country
race-whodunnit (plan perpendiculaire
au
dipole):
I turned the maximum point of
90°, so that
that resembles it
that it would be seen whether one were with dimensions of
the antenna, on the level of
ground.
It is seen that the beam opposite the
antenna is broader in
the perpendicular plan (cross-country race-whodunnit) that in the same
plan
(Co-whodunnit).
One can thus conclude, that for the
SD27, the beam opposite
the antenna forms a rectangle. Imagine
a stick of
freeze (Eskimo),
you almost cut it to the end, that made a section of form
rectangular.
If you turn the antenna to make so that
the dipole is
vertical (like a omni), then the covered zone will be one
rectangle flat.
In this case the azimuth (angle
compared to north) will be easy
to regulate,
whereas the slope (high/low) of the antenna, is more
delicate
to regulate.
Contrary, if the dipole is horizontal,
the adjustment of
the azimuth
will be more delicate to regulate. On
the other hand
you
will profit more of the reflexions on the ground. Especially if
this one has
the shape of an half-ellipse (see zone of Fresnel) (for example enters
sides of a valley).
These 2 ways of diffusing the waves
(that is called
“polarization”,
vertical or horizontal) must be
considered according to
context: to pass between buildings, to use them
reflexions of
ground, etc.
Il ne faut pas
to mix both types
of polarisation,
if not
you will have very bad results.
Apparatuses can program polarization
dynamically (PowerStation2
Ubiquity
To be complete, it is necessary to
speak about the antennas
propellers (helicoid)
whose dipole is not a right wire but a whorl.
In this case the diagrams Co-whodunnit
and cross-country race-whodunnit are
identical.
In addition, the direction in which
one winds the whorl, makes that it
an antenna wound in the same direction is necessary in
face, under sorrow
not to receive large thing.
Polarization hélicoïdale
is incompatible with
vertical or horizontal polarizations.
When one does not have the diagrams of
radiation of
antennas, one finds like characteristic, the opening.
It is
the angle around the maximum point power, for which the antenna
emits
half of its power (loss of 3 dB).
To show these owners fromces
photos, I created one
program which posts the palette. One
selects
la
colorcorrespondant
with the curve,
and then the program generates the points inun
fichier (*.ant) readable by
“radio
mobile ".
How
to circumvent
an obstacle?
More the obstacle is close to one of
the two points of the connection,
more it obstructs the connection, but nothing prevents
to put it
WiFi relay in the medium.
Un relais
credit can be fed into solar, and
to undergo 15 days of
misty time, like says it Dominique Guardiola Falco de Quinode (in
Auvergne).
Le relais
actif
fact more than to circumvent an obstacle, it double
the range.
Dominique used 1 AP, in
repeater, to decrease consumption
electric compared to a solution with 2 a.
Mekari proposes une
solution all in onesource.
It is planned for the sun
of California? or it is
awaited
climate warming?
In addition, I would be curious to know
the maximum duration
(for
France, for example) of the absence of sun AND ofvent,
for
to determine
the autonomy ofcombinaison
solar wind, while using
a battery 100Ah.
In the absence of power supply (sector,éolien,
solar) (a AP consumes 5Watts), there exists the principle of
the antenne
passivate WiFiI
validated his principle on
ground. It acts
of 2 antennas (of which one at least is directing) which is
connected by a cable.
Here the principle which I checked (who
must
to also go for
WiMax, or ofGSM
900MHz and GSM
1800MHz
Each antenna being directed towards
each one of
points to be joined:
Source
des
photographs
One sees here a relay made with limp
“pringles”
but any other antenna is appropriate.
On the level of the assessment of the
connection, nothing is changed, if not
that with
place to have a great zone of Fresnel, one has 2 small, end
with end.
There are people who wonder how that
can go,
without
energy source, here my answer:
I went to a living room radio operator
amateurs, I have
listened to the radio
in a helmet, with a station with crystal, without
no source of electricity.
The volume of the sound is low,
certainly.
From or the energy comes which
produces the sound in
helmet? ..... of
the emetor.
Thus the antenna converts the radio
waves into
electricity, this one
is thus the source to re-emit on
second antenna.
On the other hand thanks to this
installation, you have
all them
chances to have 2 well cleared zones of Fresnel,
instead of one
only evil released. A
zone of Fresnel well
released (value gives
notorious)6dB of plus
that a connection on the ground on a flat ground (in
close-cropped-mound).
To include/understand, it is necessary
to know what is a zone of Fresnel.
It is the useful part of
the air which transmits the radio signal.
It with the form of a “grain
rice
In this example, the useful part is
decreased by the ground
(with
left), it is the tear line. You
come from
to include/understand
why the antennas are often on pylones: -)
And here a natural good example of
pylone:
According toSylvain,
le
wind does not obstruct the connection.
Attention, the resin leaves badly to
the machine
to wash…
Here now another bond which
corresponds to a distance
shorter:
It is what I call a bond “in
close-cropped-mound”. Ce bond
will go hardly better that
above,
whereas la
distance is of half smaller.
These profiles were obtained with
“radio operator mobile”.
Toute partie of the ground which
tangent the grain of riz (zone of Fresnel)
améliore
propagation. Thus
to put the antennas highest
possible the best propagation does not give. ;-) Of
another
side,
one becomes depend on the vegetation
and of constructions…
Thus our passive relay WiFi must enable
us to increase
surface grains of rice, therefore to increase the margin in dB,
therefore
to increase the flow.
It is better two goods small grains of
rice, that large bad.
(saying of the day: -))
But if the straight line uniting the
antennas (one calls it line
of sight, or English LOS) is blocked,tout
is not lost
The zone of Fresnel (between the top of
the obstacle and the part
higher
grain of rice) (here in green) makes it possible to pass the waves, but
with more losses than if the line of sight were
released.
To obtain best the résulat, it is necessary to aim,
with each antenna, above the obstacle.
The height to be aimed depends on the
distance enters
antennas,
but it would seem that a height should be aimed at corresponding to
ray of the ellipse of Fresnel. For
example, for a distance enters
antennas of 3Km, that made 10m with the top of the obstacle.
Par contre, la zone of
Fresnel being a éllipse, if 2
points of the connection are close (here out of chestnut) the
connection
will not go, since the grain of rice is completely
blocked.
It is a large banana better, that a
small sausage.
(second
saying of the day: -))
If you feel the heart of an inventor,
you can take as a starting point this idea ofdirigeable
of telecommunications to make a small WiFi relay…
Below my page is in work…
AP (Access Not) (Access point)
OFDM (orthogonal frequency division
multiplexing)
GAF (Automatic Management of the
Frequencies)
PBCC (code of protection per
redundancy)
FHSS (Frequency Hopping Spread
Spectrum).
DSSS (Direct Sequence Spread Spectrum)
WEP (Wired Are equivalent Privacy).
MAC (Media Access Control)
DHCP (Dynamic Host Protocol
Configuration)
WPA (WiFi Protected Access)
TKIP (Temporal Key Integrity Protocol)
FAI (Supplier of Access Internet)
BSS (BASIC Service Set)
ESS (Extended Service Set)
CSMA (Judicious Carrier Multiple Access)
CRC32 (Cyclical Redundancy Check on 32
bits)
MIC (Integrity Message Codes)
EAP (Extensible Protocol
Authentification)
RADIUS (Remote Authentification Dial-In
Using Service)
TLS (Transport To bush-hammer Security)
LEAP (Extensible Light Protocol
Authentification)
WECA (Wireless Ethernet Compatibility
Alliance)
DOS (denial of service)
AES (Advanced Encryption Standard)
UMA (Mobile Unlicensed Access)
HSDPA
(High
Speed Downlink Packet Access)
WISP (Wireless Internet Service
Provider)
Pulsers
(Pervasive Ultra-wideband Low Spectral Energy Radio operator System)
Agora(Access
Guaranteed and Optimized for
Areas and Installation
territories)
QOS (Quality Of Service)
TBF (Token Bucket Filter)
MPU (Minimun Packet Links)
MTU (Maximum Transfer Links)
SFQ (Stochastic Fairness Queueing)
MIB (MailInBlack) (authentification of
email): -)
RAN (Rural Area Network)
WDS
(Wireless
System distribution) or Wireless
Domain Server) at Cisco
OSPF (Open Shortest Path First)
OAPI (Open Access
Not Initiative)
ARP (Address Resolution
Protocol)
WPS (Wi-Fi Positioning System)
WPS (Wi-Fi Protected Setup)
TOA (Time Of Arrival)
PLT (Precision Technology Hiring)
WCN (Windows Connect Now)
SOFDMA
(Orthogonal Scalable Frequency Division Multiple Access)
WAPI
(Wireless Authentication and Privacy Infrastructure)
WLSE (Wireless LAN Solution Engine)
(CISCO name)
SIP (Session Protocol Initiation)
replacing of H323
FTTA (Fiber Through The Air)
GIX (Total Internet eXchange) or Node
of exchange Internet
between operators
To increase the range of FreeBox:
I publish these photographs
(the “modest one” and
“bricolo”)
to be used as support with improvements of these
modifs.
In the round of bottom, it is
necessary to cut the vertical track (or
to remove the resistance which is under the heart of
cable).
Thus, it would not be necessary to cut
the tracks towards
“ANT1” and “ANT2” (round in
top).
The “large
pies” of the medium, it is for
to weld
mass (on the left it was a test).
Good, then my note:
- there is no more that only one
antenna instead of 2, therefore one loses
the diversity mode,
- me, I would have rather added
connectors
(RP-SMA to be welded)
on the level of “ANT1” and
“ANT2” for
reasons of mechanical robustness (and use of the mode
diversity),
- then I would have tested with and
without cut of the tracks on
“ANT1” and “ANT2”.
Here. :)