X10 relies on signal bursts being a logic "1" and the absence of a burst being a logic "0". A complete X10 transmission lasts for 47 powerline cycles (22 cycles for the unit code, 3 cycle gap, and 22 cycles for the function code). If the TED transmission fills up any of those "0" slots with its own signal, that will look like a collision to the receiving X10 module. Unless the X10 transmission squeezes between two successive TED transmissions, it appears that the X10 transmission will be corrupted.
Insteon transmissions are shorter in duration, and are more likely to fit between TED transmissions. The Insteon modulation scheme is also less likely to be corrupted.
Jeff
Thanks for recapping that, Jeff, I missed it the first time and I am very interested. I started with TED and no home automation, but it looks like any future forays in that direction will have be Insteon. Thanks for the heads-up!
eastpole