Joel, You last comment hit the nail on the head. We have been advising clients to migrate to 5.8 Ghz ASAP for years. 2.4 Ghz is a garbage band and all the rogues make it impossible to gain any density and throughput. While you may be adhering to 1-6-11, the rogues may not be, and many enterprise installations just set the wireless management to "auto" not realizing that many APs will end up on odd channels to avoid rogues that are on 1-6-11. You just cannot win in 2.4 Ghz. If your wireless management has band steering - use it to push clients to the higher band. Also, if you limit 2.4 Ghz associations to the higher connection speeds - you will at least help to force your clients to the best connection
Ron Walczak PMP, CWNA, RCDD On Tue, May 8, 2012 at 3:38 PM, Coehoorn, Joel <[email protected]> wrote: > Phillippe, this is something I would **love** to be shown to be wrong > about. > > I think all of us could benefit from a 4th channel (I know I would), if it > comes with clear guidelines for when and how to use it in a way that will > increase rather than decrease throughput. Right now, the best guidelines we > have say, "Stick with 1,6, and 11." Deviation from that is more likely than > not to result in pain. > > Perhaps what is needed is more successful 4 channel implementations for > study, but I think we're likely to see mainstream 5ghz make this all > obsolete by then. > > > Joel Coehoorn > IT Director > York College, Nebraska > 402.363.5603 > [email protected] > > > > > > > On Tue, May 8, 2012 at 2:19 PM, Hanset, Philippe C <[email protected]>wrote: > >> >> On May 8, 2012, at 3:00 PM, Coehoorn, Joel wrote: >> >> The short answer is "no". It comes down to the skirts again. Most >> low-end tools to measure wireless coverage do a poor job of showing this, >> but my understanding is that wifi RF is such that the skirts "flare out" >> quickly, and you have nearly all of the signal overlap even at fairly low >> power levels. These wide skirts makes it impractical to try for four >> channels... you're almost as bad off as if you tried to use all eleven. >> >> >> Joel, >> >> You forgot the "black magic" part of wireless ;-) >> We didn't go with theory back in 2000, but with measurements. >> In a large auditorium with 100+ users and 4 APs, we were getting better >> throughput with 1-4-8-11 >> than with 1-6-11-1. We didn't play with smaller cells. >> >> Philippe >> >> Philippe Hanset >> Univ. of TN, Knoxville >> www.eduroamus.org >> >> >> >> ********** 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/. > > -- Ron Walczak PMP, RCDD, CWNA/CWSP Walczak Technology Consultants, Inc (724) 865-2740 *I plan to live forever - so far, so good!* * * "The great aim of education is not knowledge but action." *- Herbert Spencer * * **Anyone can count the seeds in an apple; but only God can count the apples in a seed*. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
