Hi! For everyone...

First I’m a student and I’m making my final project about X10. So I have to make a project [ a house our a building ] totally using X10...
If I will put more than 256 devices I will need something to cut off the signal to construct 2 "LAN’s of devices... What King of object can do this job for me!?
Another one, What is the maximum of distance of one unit to another?
Anyone know a ready project about one house or anyplace just for me see and get some ideas!?


I really appreciate if anyone could help me.
Thanks, I will wait a few answer.