OT: VERY SIMPLE HOME NETWORK

[Brian K. White]

> The alarm is an automatic dial-out system, not a monitored system. I am
> guessing the relay system is what makes it "non-filtered" in that the 
> alarm wire with the relay open is the same as a jack with nothing plugged 
> into it?

That makes sense.

The part of regular phones and other devices that alters the 
capacitance/impedence on the line is the part that listens for incoming 
rings.
Maybe the alarm system has no need to "answer" incoming calls and so can be 
completely open-circuit whenever it's not making an outgoing call itself.

Brian K. White  --  brian at aljex.com  --  http://www.aljex.com/bkw/
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