[MLB-WIRELESS] 802.11g Starts Answering WLAN Range Questions

[Matt Pearce]

The D-Link web site states that using the 802.11b+ equipment you get about a
20% improvement in data from 11mbps - 22mbps.  Would anyone know what the
percentage is for 54mbps ??

Matt.

----- Original Message -----
From: "John Dalton" <john.dalton at bigfoot.com>
To: "Tristan Gulyas" <zardoz at 2600.org.au>
Cc: <melbwireless at wireless.org.au>
Sent: Thursday, January 16, 2003 2:56 PM
Subject: Re: [MLB-WIRELESS] 802.11g Starts Answering WLAN Range Questions


> > So how come it only appears to operate at 22Mbit/sec?
>
> It could be that the diagrams refer to MAC data rate.
>
> The 802.11a spin always seems to quote 54Mbit/s as the data rate.
> These are funny numbers to the point that it could be argued
> to be misleading.
>
> 54Mbit/s is based on the data rate at the bottom of the
> physical layer (ie. what is actually transmitted and received).
> Layered on top of this 54bit/s stream is error correction
> and other such things which 'consume bits' to operate.  The end
> result is that the MAC actually transmits and receives at
> something closer to 20Mbit/s.  (Compared to around 10Mbit/s
> under similar assumptions for 802.11b).
>
> Ultimately the net data rate for 802.11a is not that big an
> improvement on 802.11b (Depending on what you define to be big),
> especially at similar ranges.
>
> Regards
> John
>
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