I have a 5500 square foot house that was built in the 80s and added on in the 90s. There is a main circuit breaker panel in the garage with one of the breakers that is labeled SUBPANEL A. Subpanel A is located in the middle of the house on the new extension and feed electricity to the newer part of the house, including the master suite. I purchased some Powerline Ethernet modules to try to hook a pc in one part of the house to my master bedroom. The modules wouldn't connect to one another. After moving them from outlet to outet for an hour, it seems them would only connect when both were on either the original part of the house, or the new part of the house, but not a combination. I am not sure if this iis a phase issue, or that onepart of the house is on a separate subpanel. My main concern is using Zwave or UPB devices down the road and the possible inability to turn off lights that are in the old part of the house from the new part of the house. Any ideas?