Originally Posted by Tesla1856
Yes, a friend of mine was telling me about them only working on the same leg of the 120v. So, have you actually installed some and seen this happen in person?
That was definitely the case on OLD power-line standards.
Later HomePlug standards drastically reduced this issue, because HomePlug-AV relies more on the NEUTRAL conductor, which is shared throughout your whole house.
I have three Homeplug devices in my net. One is on the same phase as the "Master," the other is on the other phase. The one on the opposite phase is SLOWER, but not by any significant amount. The same-phase one gets about 130 megabits per second, the other gets about 90.