The arionet 1240 AG have a 5 GHz radio only for 802.11a. Hernan Badilla INCAE Business School Tel: (506) 24 37 22 75 www.incae.edu
On Thu, Nov 10, 2011 at 12:22, Heath Barnhart <[email protected]>wrote: > I agree with Joel, 80-100 users per AP is a bit much on an AP. What's the > ratio of 2.4 GHz to 5 GHz? I'm not familiar with the 1240 (have a couple > but none of them work), do they have any smartRF built in (can they "nudge" > dual band clients to 5 GHz)? > > -- > Heath Barnhart, CCNA > Information Systems Services > Washburn University > Topeka, KS 66621 > > On 11/10/2011 11:30 AM, Coehoorn, Joel wrote: > > Your problem is probably air time density. > > The issue is that you only have 3 non-overlapping channels to work with > in the 2.4Ghz space, most users won't have 5Ghz-capable laptops, each > channel only supports about 25 clients from a practical standpoint, each > access point is likely only listening on one specific channel, and you have > up to 400 users trying to connect all at about the same time. That's just > not going to work. Things get better a few minutes after a class starts > because some students will just give up, and most others will settle down > to only use air time only in short bursts, as they load and then pause to > read pages. > > The typical solution is turning down the transmit power, such that > signal for each access point does not leave it's own classroom, and then > add access points to each classroom such that you're listening on more of > the available channels within the rooms. The goal is to reduce the cell > size (and therefore number of clients) served by each access point, and > increase the available channels. You can do this by adding access points, > or by getting single access points with multiple independent radios that > are capable of using the additional channels simultaneously. > > Even here, you'll likely still have issues as many of the laptops will > not turn down power to their own radios and still clutter up the air space. > It would be like trying to listen to the professor if most students in the > classroom were also having conversations among each other at their normal > speaking volume. > > As for distributing traffic, there are different load-balancing options > out there depending on your vendor. But even with generic thick access > points you'll see quite of bit of load balancing happens naturally, without > you having to do anything special so encourage it. You ought to be able to > just add the access points without needing to do much of anything for load > balancing. > > Joel Coehoorn > IT Director > York College > 402.363.5603 > > > > On Thu, Nov 10, 2011 at 11:09 AM, Ethan Sommer <[email protected]> wrote: > >> With almost any manufacturer you can set a max number of clients per >> radio. You could set the max per radio to 25ish and put (capacity of >> classroom/25) APs per classroom. >> >> >> >> On 11/10/2011 10:54 AM, Luis Fernando Valverde wrote: >> >> Hello, >> >> we have four adjacent classrooms (two in front of two and 5 meters >> between each one) with capacity to 80-100 students each one. Each >> classroom has its own Cisco Aironet 1240 AG Access Point. >> >> When all the students inside the classroom connect their computers to the >> wireless network, response time behaves very slowly for several minutes, >> until the traffic network stabilizes and reaches a better performance. We >> have tested other AP including Ruckus (802.11 b/g/n) and the problem >> remains. >> >> We could install two AP by classroom, but we would need to distribute the >> connections between each one. Does someone know a solution without having >> to use different SSIDs to distribute traffic among multiple access points? >> Does someone have any suggestion to solve this issue, including other >> access point manufacturer? >> >> Any comment is welcome. >> >> Thanks, >> >> ----------------------------------------------------------------------------------- >> Luis Fernando Valverde >> Director de Tecnología de Información y Comunicaciones >> INCAE Business School >> Tel: 506+ 24 37 23 38 >> www.incae.edu >> >> ------------------------------------------------------------------------------------ >> ********** Participation and subscription information for this EDUCAUSE >> Constituent Group discussion list can be found at >> http://www.educause.edu/groups/. >> >> >> >> -- >> Ethan Sommer >> Associate Director of Core Services >> Gustavus Technology Services >> [email protected] >> 507-933-7042 >> ********** 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/.
