On Tue, Mar 27, 2007 at 09:52:22AM -0700, Bernard Aboba
wrote:
> BTW, I did some traces, and 170 octet Beacons are
actually quite common
> (Apple Airport Extreme has Beacons of this size, for
example).
>
> If you add up 1360 bits at 1 Mbps (1360us), 144 us for
preamble, 48 us for
> PLCP, 10 us for
> SIFS, 50 ms for DIFS, and 1200 usec for CWmin/2 slot
times, and multiple by
> 98 Beacons/sec, you get 27.6 percent.
>
> 200 octet beacons would give 30 percent. So I don't
think that the Velayos
> paper is that far off.
Sure, it is possible that beacons are longer. Though, I
would assume
that this would be more likely with 802.11g/a APs while the
paper was
talking about 802.11b which is unlikely to include many of
the new IEs
in beacon frames. Anyway, if the question is on how many
"modern APs"
one can have on a single channel, this kind of channel time
usage may
indeed be getting more likely since I would expect most
802.11g APs to
continue beaconing at 1 Mbps rate.
--
Jouni Malinen PGP
id EFC895FA
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