Christopher, We have a group on campus that has about 40 iPads in a cart for student use. We never had a connection issue per se with these iPads, but we did notice that every hour (literally every 60 minutes) we would see all of the iPads that were asleep and connected to a single AP suddenly disconnect then reconnect. Our wireless vendor is Cisco. To my knowledge when they woke them up they never had an issue with connecting them, we just happened to notice an hourly dip in our Prime connection graphs during the summer.
I'm not sure if this helps or not.... On Tue, Oct 13, 2015 at 2:45 PM, Jeremy Gibbs <jlgi...@utica.edu> wrote: > May I ask, who is your wireless vendor? > > > > > *--Jeremy L. Gibbs* > Sr. Network Engineer > Utica College IITS > > T: (315) 223-2383 > F: (315) 792-3814 > E: jlgi...@utica.edu > http://www.utica.edu > > On Tue, Oct 13, 2015 at 2:32 PM, Butler, Christopher < > cbut...@stjohnsprep.org> wrote: > >> I'm looking to collect some other information to help inform our process >> to resolve an issue we are experiencing on our wireless infrastructure. I >> have an open incident with my vendor and they are working on a resolution, >> but I'm trying to determine if we are the only ones dealing with this. >> >> We have a large deployment of iPads (1500) on our campus. somewhat evenly >> distributed across iPad Air 2, iPad Air, iPad 4 and iPad 3 and almost all >> are running iOS 8.x. >> >> We had an issue crop up this fall when a group of iPads all connected to >> the same access point all go to sleep at the same time. The access point >> seems to lose track of which devices are asleep and which aren't and it >> ends up overwhelming the RF space with RTS packets to iPads that don't >> respond, thus rendering every other client on the access point almost >> non-functional. >> >> Has anyone seen wireless transmit issues related to iOS "sleep" mode? The >> packet captures indicate that the iPads seem to oscillate quickly between >> "sleep" and "awake" and eventually end up asleep will the AP thinks that >> they are still awake. >> >> Obviously, I'm in the middle of a bit of finger pointing between the >> wireless vendor and Apple and other data points can only help. >> >> Thanks, >> Christopher >> >> Christopher Butler >> Assistant Head of School. Information Services >> St. John's Preparatory School >> http://www.stjohnsprep.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/. > > -- *Joe Roth* *Network ManagerBinghamton UniversityPh. 607-777-7528Fax 607-777-4009* ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
