Keep in mind, Ruben, that X10 uses zero crossing for timing and
datalength and the mains AC as carrier. Most X10 were designed for the
US market which works on 60Hz and X10 will not work on 50Hz. Look at the
UK HA market for products.
Other alternatives for mains carried comms are the CEBus chips.
Companies such as Intellon(.com?) and  Domosys(.com?). They do high
speed stuff. Also Phillips has a mains based modem. You most prolly will
find these chips in networks like the one LG advertise on the TV (in SA).
OK, having said that, my research (a few years ago) has pointed out a
lot of problems with mains comms. For instance a light dimmer on your
line means death to x10 comms. Anti Spike systems (RC, coils, etc) also
play havoc. Put a AC Drive on the line (not likely in a home) and the
harmonics fed back also stuffs it up. Motors (like washing machine and
fridge) cause spikes. Fourescent light ballast, etc. etc.
You see what I am getting to? It is not as easy just because the wires
are already there. Try the upmarket chips I pointed out earlier, they
can handle these things. But they are expensive.

As a hind site if I do HA now, I will stick in a seperate comms line in
my house. And prolly use CAN, as I am developing a system using CAN for
work. Good points made about CAN by another person in another post.

 And since as you say you are building a new home, this is the best time
to get the cables in. Don't worry about the protocol for now, get that
cables in! Think Home Networking.

Quentin
(Cape Town)

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