Originally Posted by pgreenwood
If I connect a green/green-white pair at the source I find continuity at several plates.
OK, u gotta think what these wires were originally intended for: 2-wire phone lines. So in a typical U.S. household, the phone company runs two 2-pairs wire into your junction box (4 wires total) for two possible phone numbers.
Now most home use only a single phone number.
So as you connect the green/green-white pair at the source, THESE ARE the pairs that the original installer used for your single phone number.
Now of course even with a single number, the occupants often times want the phone in each room to ring as calls are received.
So if you look carefully around/behind the source panel, hopefully you will see the different pairs from the plates are spliced together to become one pair and connect to the incoming this way. If u don't see it here, then there is a junction somewhere else where the splice was done, and well, good luck finding it.
Now at the plates, please do unscrew the plate and look see how many wires are REALLY there. For data connection you need at least 4 wires (2 pairs). If u see only 1 pair ur done for.
Now this assumes the wirer did the star topology thing, which he should had done. The next bad scenario is, he used two pairs and went:
source - pair one - plate1 - plate2 - plate3.
source - pair two - plate1 - plate2 - plate3.
In this case you should see two pairs at each plate and only one pair is being connected.
As long as you have two separate pairs, you can make 1 data connection.