sender/receiver interfering

I'm trying to understand the wireless 802.11g protocol. My
understanding is that the sender and receiver use the same frequency.
How do they prevent interfering with one another? I'm guessing there's
some kind of TDMA, but I can't find a layman's explanation of the
details.

Thanks.

(E-Mail Removed) hath wroth:

>I'm trying to understand the wireless 802.11g protocol. My
>understanding is that the sender and receiver use the same frequency.

Correct. On a given infrastructure wireless network, all radios are
on the same channel (as controlled by the access point).

>How do they prevent interfering with one another?

Easy. The radios only transmit and receive one at a time. If you
have a room full of laptop users, only one laptop may transmit at a
time. Of course, everyone can listen all the time, making this
"half-duplex".

>I'm guessing there's
>some kind of TDMA, but I can't find a layman's explanation of the
>details.

Well, this was a nifty article covering just about everything you
would want to know about conventionaly wireless installations.
However, it seems to be missing (along with the entire wireless
directory).
ftp://download.intel.com/business/bs...nt/hotspot.pdf
Perhaps Intel is going out of the wireless biz? (I like starting
rumors). I posted my archived copy of the article at:
http://802.11junk.com/jeffl/crud/Int...ot%20Guide.pdf
1.9MByes and worth reading.

If you want to go deeper into how the protocols work, there's always
the 802.11b/g specifications at:
http://standards.ieee.org/getieee802/802.11.html
Warning. Reading this stuff makes my brain turn to mush.

There are also some tolerable web sites that explain Wi-Fi.
http://www.wi-fiplanet.com/tutorials/

--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

<(E-Mail Removed)> wrote:

> I'm trying to understand the wireless 802.11g protocol. My
> understanding is that the sender and receiver use the same frequency.
> How do they prevent interfering with one another? I'm guessing there's
> some kind of TDMA, but I can't find a layman's explanation of the
> details.

802.11 uses CSMA/CA

http://www.hpl.hp.com/personal/Jean_...x.Wireless.mac.
html

(Sorry if the link may be broken on your reader)

On Thu, 26 Oct 2006 14:05:13 +0200, (E-Mail Removed) (Axel
Hammerschmidt) wrote in <1hntiy3.51svjsmt72f4N%(E-Mail Removed)>:

><(E-Mail Removed)> wrote:
>
>> I'm trying to understand the wireless 802.11g protocol. My
>> understanding is that the sender and receiver use the same frequency.
>> How do they prevent interfering with one another? I'm guessing there's
>> some kind of TDMA, but I can't find a layman's explanation of the
>> details.
>
>802.11 uses CSMA/CA
>
>http://www.hpl.hp.com/personal/Jean_...x.Wireless.mac.
>html
>
>(Sorry if the link may be broken on your reader)

No "if" -- it was broken by your news client. Framing a URL in <> (per
the Internet standard) may help. Otherwise you might want to use a
client that doesn't break URLs, or add a short link:

<http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Linux.Wireless.mac.html>
or <http://tinyurl.com/yf53jl>

Short links are available at:
<http://tinyurl.com/>
<http://notlong.com/>

--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>

John Navas <(E-Mail Removed)> wrote:

> On Thu, 26 Oct 2006 14:05:13 +0200, (E-Mail Removed) (Axel
> Hammerschmidt) wrote in <1hntiy3.51svjsmt72f4N%(E-Mail Removed)>:

<snip>

> >http://www.hpl.hp.com/personal/Jean_...x.Wireless.mac. html
> >
> >(Sorry if the link may be broken on your reader)
>
> No "if" -- it was broken by your news client.

Sperm damage, already?

On Thu, 26 Oct 2006 16:29:05 +0200, (E-Mail Removed) (Axel
Hammerschmidt) wrote in <1hntpnw.1uu5tk61a1j9nsN%(E-Mail Removed)>:

>John Navas <(E-Mail Removed)> wrote:
>
>> On Thu, 26 Oct 2006 14:05:13 +0200, (E-Mail Removed) (Axel
>> Hammerschmidt) wrote in <1hntiy3.51svjsmt72f4N%(E-Mail Removed)>:
>
><snip>
>
>> >http://www.hpl.hp.com/personal/Jean_...x.Wireless.mac. html
>> >
>> >(Sorry if the link may be broken on your reader)
>>
>> No "if" -- it was broken by your news client.
>
>Sperm damage, already?

You have my sympathy.

--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>