In our school environment, we have a WPA2 network with simple username/password for joining all our Apple TVs. Eventually we replaced this with hard-wired Ethernet connections. Faculty and staff join another WiFi network which students may not access. This network allows staff to see Apple TV in AirPlay while students may not.
The problem is we have incredible inconsistency with some users experiencing periodic disconnects while others are fairly consistent. We checked with a number of other schools experiencing the same problem, and we also checked with two outside networking companies to evaluate our network health. Health is good. Pinging many different end points, we see packet loss is unusual. We have come to the conclusion that the problem is in the Apple TV device, not our network.
I read that using Apple TVs in this way is in a sense creating a use case for the device as they were never intended to be used in such an environment. I want to find success stories where relatively large schools (1200+ staff and students) have deployed Apple TVs and used them without the problems we are having.
Some other things we did based on research:
Turn off sleep mode
Disable screen saver
Turn off Bluetooth
Upgrade to Generation 3 Apple TV
majority iPads are 3+ but there are some iPad2
Best Answer
We have a similar setup at our school, approx. 1300 students and an Apple TV in every room, most of which are connected to Dell projectors and Promethean interactive whiteboards. Like your setup, our ATVs connect via Ethernet.
And yes, we've had our fair share of teething troubles since adopting Apple equipment in 2012, particularly with dropped connections. Apart from poor IT practise and usage from staff we've had a few network issues that, once identified, have made things much more reliable.
Before last summer all our access points were set to dual-band operation, allowing the Macs to select network settings automatically. This worked reasonably well until a Cisco firmware update in the summer when things went downhill. Airport diagnostics indicated the 2.4GHz band was pretty busy so we made the Mac VLAN 5GHz-only. Having all clients connecting on 5GHz has massively reduced the number of dropped connections and reliability overall has significantly improved. Incidentally this have the knock-on effect of killing AirPrint on our Epson Workforce printers so they've had to be wired in.
Our biggest problem though has come from teaching staff using MS PowerPoint. Prior to 2012 all our staff used Windows and Office for all their needs, and it was deemed necessary to ease the transition to the Apple environment by giving Staff access to Office Mac 2011. I'm no fan of Office but it's what the staff are used to. Our PowerPoint problems come from staff thinking they are saving time by loading up a day's worth of teaching material into PowerPoint, which then frequently crashes and takes AirPlay down with it. Occasionally we can sort AirPlay issues out by cycling the Wi-fi off and on again, but frequently it's more of a case of logging the teacher off and back in again, or restarting OS X in the worst cases. Teachers using Keynote are almost never affected.
A couple of other things...
Occasionally (and generally while using PowerPoint) a teacher will try to connect to the ATV in their room but it will randomly connect to a completely different ATV elsewhere in the building. We nailed that by passwording each ATV using the room number as the password.
We've also had issues recently with a number of ATVs refusing to wake up automatically when attempting to connect to them. This has come as a result of a software update which failed on those units. They would otherwise work ok but would have to be turned on manually. Restoring the units via Apple Configurator brought them back to full functionality. - Note, this can also be done via iTunes but iTunes doesn't cache the downloaded firmware and so does a fresh download for each unit to be restored. Restoring via Configurator is much quicker as it checks to see if it has already downloaded the firmware.
Hope this gives you some ideas...