> On a related note, I recently learned that Aruba is currently recommending a > 4-channel model (1,4,8,11) for dense 2.4 GHz deployments, arguing that the > performance benefits of one more channel offsets the co-channel interference > issues. Is anyone doing this?
UT has been using that "trick" since 2000, 1,4,7,11 for that exact same reason. The co-channel interference is definitely there, but the ease of deployment and the extra capacity are definitely greater than the loss! Philippe Hanset University of Tennessee > > dm > > > _____ > > From: Ruiz, Mike [mailto:[EMAIL PROTECTED] > Sent: Tuesday, June 27, 2006 8:58 AM > To: [email protected] > Subject: Re: [WIRELESS-LAN] Meru Question > > > > Don, > > As a Meru user I can personally tell you that Meru's system does > not negatively impact any other access points unless you put them on > overlapping channels or use the rogue suppression. As far as the "bug" this > is simply not true, and I can provide more detail regarding this if you want > but didn't want to bore anyone. There are lots of tests here and > independent tests to verify the first. Likewise Meru uses Atheros > technology and 100% 802.11 standards compliant client side technology. > > > > My perspective on 802.11n is that Meru is most uniquely > positioned to make 11n a workable reality. Forget the fact that they will > continue to eliminate co-channel interference and contention across cells > making the bandwidth promised by 11n a reality. The real core of what makes > 11n work is that each channel uses more bandwidth. Thus in the 2.4GHz space > you will essentially need two of the three available channels to serve 11n. > Well if you're using 1 and 6 or 6 and 11 what are you left with for > neighboring cells? A coordinated design that can overlap without > interfering will be required unless another "band-aid" solution like > micro-cells is developed. Or you can move the 5Ghz space, cut the number of > channels in half and then be faced with all the problems plaguing 802.11g > today. It's consistently amazing to me that vendors tout 11n as a solution > when problems like the crash in available bandwidth when 3 or more users > come online remains a reality. > > > > Cheers, > > Mike > > > > -- > > Michael Ruiz > > Network and Enterprise Systems Engineer > > Hobart and William Smith Colleges > > > > > > > > > _____ > > > From: Donald R Gallerie [mailto:[EMAIL PROTECTED] > Sent: Monday, June 26, 2006 3:47 PM > To: [email protected] > Subject: [WIRELESS-LAN] Meru Question > > > > Here at the University at Albany, we had Meru come in and give us an > overview on their wireless > > offering. > > > > From our vantage point, it does appear that Cisco is pushing the > controller-based system so we > > decided to look at other vendors in this space. As part of this effort, we > asked Cisco to come in > > and give us an overview of their offering as if they didn't already have a > presence on campus. > > > > One of the items that came up had to do with Meru's method of distributing > timeframes to clients > > (don't know if I'm phrasing this correctly). The Cisco engineers said that > Meru's methodology works > > well in a Meru-only rollout but that they would negatively impact other, > non-Meru access points. > > Additionally, the said that there is a "bug" in the current 802.11b/g > standard that Meru takes advantage > > of and that it may not be there in future (802.11n) standards. > > > > Not that I would doubt anything Cisco says but has anyone heard any similar > remarks or can > > anyone expand on Cisco's claims? > > > > Thanks.. > > > > Don Gallerie > > The University at Albany > > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at > http://www.educause.edu/groups/. ********** Participation and subscription > information for this EDUCAUSE Constituent Group discussion list can be found > at http://www.educause.edu/groups/. > > > ********** > Participation and subscription information for this EDUCAUSE Constituent > Group discussion list can be found at http://www.educause.edu/groups/. > ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
