On Tue, 9 Jul 2002, Benjamin wrote:
> > is 5 GHz, yes, and
> > is spec'd at 45 Mbps. In reality, you're lucky to get 20 Mbps out of it,
> > and the range is generally under 10m indoors.
>
> I am surprised to hear that. Why would it be spec'd at 45 if you can
> only hope to get less than half of that ?
Why is 802.11b spec'd at 11 Mbps when you almost never get more
than 7 Mbps, and often get 1-2 Mbps?
The "spec'd" limit is a theoretical limit, and of course it's the one
all the marketing folks quote because it's the highest number. But next
time you're using 802.11b, for example, have a look at what rate your
card is actually running at, and then try using netpipe or another
benchmark to see what throughput you're actually getting.
> However, if you were to use this as point to point, from roof-top to
> roof-top or from roof-top to a fixed spot at ground level, provided
> there is clear line of sight, I would think that it should be possible
> with uni-directional antennae, proper alignment and calibration, to get
> close to the maximum bandwidth as per spec. Wouldn't you think so?
I honestly don't know. I am not familiar enough with 5 GHz to know its
propagation characteristics well. But my friend found his real-world
experience with an installation that was done under pretty darn good
conditions (indoors, relatively small area) to be very disappointing.
cjs
--
Curt Sampson <cjs_at_cynic.net> +81 90 7737 2974 http://www.netbsd.org
Don't you know, in this new Dark Age, we're all light. --XTC
Received on Wed Jul 10 07:09:28 2002