[Prism54-devel] Bandwidth limitation - where?

[Jim Thompson]

On May 21, 2004, at 4:26 AM, Denis Vlasenko wrote:

> On Friday 21 May 2004 12:41, Andriy Korud wrote:
>> Hi,
>> in my tests I was able to achieve maximum 18Mbit/s in ad-hoc mode and
>> 16Mbit/s in master mode in Linux-Windows communication using current 
>> CVS
>> driver. Signal strength and link quality are 100% - according to 
>> windows
>> driver information. So I'm very interested where is bandwidth 
>> limitation -
>> driver architecture? Limited chipset specification?
>
> Unlike wired ethernet, even at 54Mbit/s modulation you cannot send
> 5.4 Mbytes per second over 802.11g. It's a protocol limitation.

Well, in-theory you can go just over 6Mbps with TCP over 11b, and just 
over 30Mbps with 11a or 11g.

WLAN Mode       Maximum Link Rate       Maximum UDP Rate        Maximum 
TCP Rate
802.11a Turbo   108 Mbps                55.1 Mbps               42.7 
Mbps
802.11a         54 Mbps                 30.7 Mbps               24.0 
Mbps
802.11g (g-only) 54 Mbps                30.7 Mbps               24.0 
Mbps
802.11g         54 Mbps                 19.6 Mbps               14.5 
Mbps
(11b present & idle)
802.11g         54 Mbps                 11.2 Mbps               9.2 Mbps
(11b active)
802.11b         11 Mbps                 7.1 Mbps                6.1 Mbps

Jim