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802.11G slowdown with B clients attached (mixed mode)

E

Esbil

Junior Member
I've noticed (and read it referenced in a number of WAP reviews) that B clients attached to a G network will slow the entire transfer rate. When I did some searching, all I came up with was a reference to CTS Protection Mode -- but that's disabled on my router/WAP.

Anyone have some good white paper info on why the B client slows traffic when the WAP is in mixed mode?

[edit] meant to say that CTS is disabled on my router [/edit]
 
It is not a matter of setting; early 802.11g use to be slow down with the presence of 802.11b signal.

If intolerable, and can not improve by flashing the newest firmware available get new hardware.

:sun:
 
It's a relatively new piece of hardware (latest WRT54G version).

I've been doing some reading/searching this morning and it seems to be the general concensus that there will always be some overhead regardless of hardware because of the way the two different types (B & G) communicate with the WAP. If that's not the case anymore, I'd like to see a link/white paper that describes how it gets around the limitation (without using multiple radios that is).
 
you can't get around it AFAIK.

overall data rate will slow for all clients if there are b clients on the access point. You should be able to tell your AP to do G only if it is a concern.
 
There's no way around it.

The issue is that since "b" and "g" use different encoding & modulation (even though they are on the same channels / freqs) and can't "see" each other, the AP has to go into a mode where it explicitely controls who talks when (so that the g and b clients don't talk at the same time).

That process slows the whole deal down.

It does *not* drop everyone to 'b' mode. The throughput reduction for the g clients is ~25-35% as a rule, depending on how many b clients, and how much traffic they produce or cause (i.e., response from a web server).

FWIW

Scott

 
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