[sdiy] Sending Digital Commands Over Your House's AC Wiring?

[Neil Johnson]

Hi,

Ken Elhardt wrote:
>> I have a question that I've been wondering about for at least 25  
>> years
>> because it seems very bizarre and I've never heard of anything  
>> else on
>> earth working this way.


Go check out ISO standards for mains-borne comms.  The old systems  
used frequencies around 140kHz IIRC.

And of course the venerable X10 that's been around for a long time:

	http://en.wikipedia.org/wiki/X10_(industry_standard)

Jason Proctor wrote:
> offhand i'm not sure why it doesn't have more adoption. although it  
> is a little awkward if the house has more than one mains circuit!

I guess you guys haven't heard of HomePlug...?  Linksys, Zyxel,  
Solwise ... all do modules that for AV use support (supposedly) up to  
200Mbps Ethernet.

Cheers,
Neil
--
http://www.njohnson.co.uk