ArcSystem / ArcMesh system : Channels? Wireless DMX?

Two parts to my query?

When configuring a system are the wireless 'channels' equivalent to "Zigbee" channels in terms of freqency etc? (i.e. is channel 25 sitting on the upper edge of wifi channel 11's noise).

Does the TX1 send a constant stream of DMX data out, or only when it's registering changes on the DMX input? 

Trying to troubleshoot a grumpy system in a very noisy 2.4Ghz environment. (Retrofitting wires would be a great idea, but not an overnight fix).