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The
roaming function works well and providing there is a goodish overlap in
coverage takes less than 1s for association with the next AP to occur
- I
have never found it to be an issue yet.
In simple terms and to answer the question re.
channels: use 1, 6 and 11.
Delete now if you don't want
explanation:
As for
the channels, you could keep them all on the same channel - re-association
with
roaming would still happen but available throughput could be impacted
depending
on relative proximity of active clients and APs etc. Out of the 14 defined
channels available only 13 are available for use in the UK (if you have US
import kit then replace 13 with 12).
I
find
it hard to describe the channel scheme without a diagram but will have a
go.
Imagine 3 blocks, all the same length, labelled 1, 6 and 11 aligned
end to
end horizontally (number one to the left). On top of this put another 3
blocks
of the same size labelled 2, 7 and 12. This second row is not aligned
perfectly
with the one underneath but offset to the right so that 2 overlaps most of
1 but
also some of 6. Continue this until you have 5 rows stacked. The end
'column' finishes at 14. Taking the bottom row as the reference channels
2,3,4
and 5 overlap both 1 and 6. 7,8,9 and 10 overlap both 6 and 11and so
on. Channels 1,6 and 11 are non-overlapping as to are 2,7 and 12. 3,8
and
13 also do not overlap.
I have seen documentation which refers to the use
of 1,
6 and 11 for overlapping cells. I have seen other documentation talking
about 1,
7 and 13 which gives even more separation but 1,6 and 11 is good
enough.
The purpose is to provide some flexibility
allowing
avoidance of narrow band interference while not wasting large chunks of the
available
space.
HTH
David
-----Original
Message-----
From: Mark
Harrison [mailto:Mark.Harrison@xxxxxxx]
Sent: 09 July
2002 14:24
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] Wireless ADSL
stuff
>From
Linksys:
"Roaming is the ability of a wireless computer user to
communicate continuously while moving freely throughout an area greater
than
that covered by a single access point. In such a system, the users end node
undertakes a search for the best possible access to the system. First, it
evaluates such factors as signal strength and quality. Based on that
information the node next selects the strongest Access Point and registers
its
address. Communications between end node and host computer can then be
transmitted up and down the backbone. When a node no longer receives
acknowledgment from its original access point, it undertakes a new search.
Upon finding a new access point, it then reregisters, and the communication
process continues."
Blech!
So
then it does have to
loose contact with the first access point before it looks for another. It
isn't a massive deal, but I'd hardly equate that to roaming freely. I see
what
you mean regarding the hub versus switch argument. I'm visualizing this as
I
type. Only the relevant lights are flashing. I do seem to remember reading
something on the Compaq website regarding keeping adjacent cells at least
two
channels apart - not really an issue with 14 channels and two access points
J
-----Original Message-----
From: Timothy Morris
[mailto:timothy.morris@xxxxxxx]
Sent: 9 July
2002 08:55
To: UKHA
Subject: [ukha_d] Wireless ADSL
stuff
Thanks to
everyone
for their help and suggestions (esp. Mark and Mary for giving up a Saturday
afternoon). I've now got the following set up on my living room floor for
testing purposes (good job I'm single)
Alcatel 510 DSL router
Linksys 8 port switch
2 x WAP 11s
All took about an hour to set up out of the box, plus a
scary half hour where I thought a failed firmware update had fried one of
the
WAPs! Using 3 workstations plus the router with the switch gives far better
performance than peer-peer networking even with encryption turned
on.
For those of you using
these in corporate settings, is there a minimum recommended channel spacing
between adjacent APs, and do they operate on a hand-off basis like cellular
phones should do, or are they like cellular phones really work, and you
have
to loose the signal from the really weak base station before you can log on
to
the base station you are less than a foot away
from?
Any resources that
can
point me in the direction of encryption together with XP, and is it
possible
to mix 128 and 64 bit encryption (I'm pretty sure that one is a no-no)? In
particular what is the difference between open and shared key, and
both?
Tim - who's been
using
wireless for ages, but only peer-peer.
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