iPad AirPlay to Apple TV - 802.11n problems
I was poking around in the router's admin interface and examined the wireless settings. On this particular router, for each frequency band (2.4GHz and 5GHz) there is a "Wireless Mode" setting that enables high-speed operation. It has three settings for the 5GHz network:
Up to 54Mbps
Up to 145Mbps
Up to 300Mbps
The factory default is Up to 300Mbps. I tested all three settings,
and the only one that works is the slowest Up to 54Mbps.
It appears that AppleTV's 802.11n implementation does not support speeds above 54Mbps.