On Mon, 18 Jan 2010, Ed wrote:
This is just going to get worse:
This year I will begin giving presentations with concurrent XMPP,
Audio and Java sessions via an AP as integral parts of the
presentation.
1. do you have to run your own AP
2. if you do, what flexibility do you have as to what channel you run it
on (putting up an AP on the B/G channels _will_ run into severe
interference, on A it has a chance, on N even more of a chance)
3. definantly coordinate what you do with your AP with what's in place
already.
David Lang
great topic
On Tue, Jan 12, 2010 at 12:19 PM, Richard Chycoski
<rskiad...@chycoski.com> wrote:
da...@lang.hm wrote:
On Tue, 12 Jan 2010, Richard Chycoski wrote:
da...@lang.hm wrote:
On Tue, 12 Jan 2010, Richard Chycoski wrote:
I would also configure all of the APs for 'b' only (no 'g') to get
the maximum use of your channel space. Mixing AP types as you have
suggested may cause you more headaches, but then since $WORK builds
our own, it's easy for us to use all the same AP everywhere - but
it sure does make WiFi roaming between the floors (and buildings)
less troublesome.
b and g use the same channels, just at different speeds. I would
expect that everyone would be using g nowdays, and the more people
who use g the shorter the transmissions, and the less cluttered the
airwaves
g uses groups of b channels. If you restrict the network to b, you
get more channels to work with, and providing a cell structure is
more practical. Besides, if any b devices come onto the net, it
becomes b anyway. Any g device can operate as b, and I think that
throughput is going to be the least of your worries - channel overlap
and contention are likely to render g pretty well useless.
no, g and b have the same RF footprint, in both cases each channel is
wide enought that it overlaps several adjacent channels. To avoid this
interferance the only channels that you can use are 1, 6, 11. It
doesn't matter if you are using b or g.
My bad - somehow I had developed an incorrect understanding of the b/g
channel arrangements. I sit corrected!
You *can* use overlapping channels if they are far enough apart, it's
still better than using the same channels too close together. I'll see
if I can get the bandplan that we use at work, because there are far too
many APs on the floor for them to have been restricted to three channels.
This paper
<https://upcommons.upc.edu/e-prints/bitstream/2117/1234/1/CrownCom07_CReady.pdf>
has a discussion on the use of overlapping channels that you might find
useful. Spread-spectrum does help. Using overlapping channels will
reduce throughput, but same-channel interference is much worse
(throughput is very poor).
- Richard
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