[MLB-WIRELESS] 802.11 and 802.11b
tlangdon at atctraining.com.au
Thu Nov 15 08:16:34 EST 2001
> I see from some 11Mbit cards specs that they will do 802.11b
> (11Mbit) and
> 802.11 (2Mbit). I know not everyone has the $250-$300+ to
> play with 11Mbit
> cards. What scope is there for use of the far cheaper 2Mbit
> cards ($80
> odd) with the Melb Wireless network? Do 802.11b cards need
> to be forced to
> do 802.11 or will they autodetect 802.11 and seamlessly
> switch between that
> and 802.11b?
Be careful here. 802.11 isn't a single standard, but effectively has 2 sub
standards - FH and DS. AFAIK, 2Mbps DS (direct sequence) can communicate
with 802.11b cards (which are DS AFAIK), at the 1 and 2 Mbps bit rates.
However, 802.11 can also be used on FH (frequency hopping) hardware. This
is _NOT_ compatible with the higher speed cards (again, AFAIK, YMMV).
> Or, should 2Mbit be confined to west Melb and east Melb kept
> 11Mbit? ;)
> <Flame retardant clothing on>
Given where I am, the lower speeds are the more practical anyway (see
> Mind you, 802.11 should get better range than 802.11b (due to
> the higher
> process gain.)
Indeed, there is a law called Shannon's Law that determines how much data
can be pumped down a given channel - and lower bitrates can always survive a
noisier channel (i.e. better range).
Well, if 2Mbps gear is available for $80.... tempting to have a play. I
don't have a need for a super huge pipe out (that's what sloptus cable is
for ;) ), and my interests in WLANS are more experimental than anything.
Yes, I think this old stuff has a place. :)
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