RE: iPad spontaneous reboots?
Apple iOS 4,3 has been released, so this could be upgrade related. http://www.apple.com/ios4.3 Bruce W Osborne Wireless Network Engineer IT Network Services (434) 592-4229 LIBERTY UNIVERSITY 40 Years of Training Champions for Christ: 1971-2011 From: j...@nww.com [j...@nww.com] Sent: Thursday, March 10, 2011 9:49 AM Subject: Re: iPad spontaneous reboots? Don't know if this is relevant, but I did find this thread on Apple support forum from November 2010: Topic : iPad is stuck on rebooting mode after iOS 4.2 upgrade http://discussions.apple.com/thread.jspa?threadID=2659923 One user had this to say: "I just called the Apple support. They told me to go into settings->general->reset all settings. and now it boots as quickly as it did before the upgrade. For what it's worth..." I did a Google search based on: +iPad, +reboot, +suddenly I haven't found anything recent that matches these terms…. Regards, John Cox Senior Editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Reynolds, Walter Sent: Thursday, March 10, 2011 9:18 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] iPad spontaneous reboots? Have not heard of this happening here. We have mostly Meru and some legacy Cisco. -- Walt Reynolds University of Michigan On Mar 10, 2011, at 8:48 AM, "Peter P Morrissey" mailto:ppmor...@syr.edu>> wrote: Has anyone heard about iPads suddenly rebooting on their own? We are hearing reports of this, and of course they are connected to our network when it is happening, so it is the network causing it. Just wondering if anyone else has heard this. Thanks, Pete Morrissey Syracuse University ** 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/.
Re: [WIRELESS-LAN] iPad spontaneous reboots?
I haven't heard about about any iPads rebooting due to wireless, but I have two thoughts: 1) Is it rebooting periodically? If so, is it really just disconnecting from the wireless network periodically? (Google "wireless disconnects after 30 minutes" and you will find quite a few hits). One of my people, Nathan Broome, found that we had a client disconnect parameter set to 30 minutes. This setting was probably just carried forward from a Cisco default setting from many years ago. You can disable the setting in the Cisco Wireless LAN Controller by going to WLANs -> ID> -> Advanced and unchecking "Enable Session Timeout". 2) Set up a non-broadcast SSID on another subnet and have one of the people who have the problem use this SSID. This might help to determine if the problem is with RF interference or some network traffic that is taking out the iPad. If the iPad is rebooting due to traffic then you could set up a continuous packet capture and try to find the packet that is taking out the iPad. I worked with my staff to set up a non-broadcast SSID here and I find it useful now and then. Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8798 http://www2.oberlin.edu/staff/bhulver/ >Has anyone heard about iPads suddenly rebooting on their own? > >We are hearing reports of this, and of course they are connected to >our network when it is happening, so it is the network causing it. > >Just wondering if anyone else has heard this. > > >Thanks, > >Pete Morrissey >Syracuse University ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Wireless thermostats and Wifi coexistance
Our facilities staff have made it known to us that they wish to install wireless thermostats in a few dorms for centralized management. They are looking at a solution by Viconics. http://www.viconics.com/thermostats.php The devices use the 2.4Ghz space and claim coexistence with existing WiFi networks due to its implementation of ZigBee technology. http://www.zigbee.org/Home.aspx I'm unfamiliar with the technology, but from what I've read ZigBee uses channels separate from the non-overlapping 1,6,and 11, but if you are using channels between 1,6,11 aren't you then overlapping with them? I've also read something about using channel 15 and 20 which I didn't know existed. Is anyone familiar with these products and can confirm for me if there is reason for concern or not? Thanks! -- Branden Kirk Network Administrator, IT Operations Biola University (562)944-0351 x5032 ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Wireless thermostats and Wifi coexistance
On Fri, 11 Mar 2011 15:28 -0800, "Branden Kirk" wrote: > I'm unfamiliar with the technology, but from what I've read ZigBee uses > channels separate from the non-overlapping 1,6,and 11, but if you are using > channels between 1,6,11 aren't you then overlapping with them? I've also > read something about using channel 15 and 20 which I didn't know existed. > Is anyone familiar with these products and can confirm for me if there > is reason for concern or not? I just skimmed through a Zigbee whitepaper on co-existence with 802.11 networks: http://www.zigbee.org/imwp/download.asp?ContentID=11745 It sounds like they're claiming Zigbee uses relatively narrow chunks of spectrum, and can fit between 1, 6, and 11. Whether or not that's true in practice, I don't know, but the carrier-sense feature of Zigbee radios should keep them from stepping on 802.11 traffic. If you have access to a spectrum analyzer (even something relatively cheap like a WiSpy or Ubiquiti AirView) and a demo Zigbee thermostat, it should be easy to check quickly. There are also Zigbee radios that operate in the 900MHz band. Here's another paper on Zigbee and 802.11 networks (focusing on a hospital environment): http://nrlweb.cs.ucla.edu/publication/download/538/a5-hou.pdf -- Nick Kartsioukas Cuesta College Computer Services 805-546-3248 ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
