Having reread the post, he is calling it both an OPX and a dry pair.

I don't think an analog extension on a dry pair off the Legend is going to go 5 blocks, but who knows?

What I have understood a dry pair to be is just two copper wires that is rented (usually) for a short distance on LEC phone wiring. Often to the B box, across the street and to another building or some such short distance.


What I have understood an OPX to be is an OLB13C circuit where the LEC provides DC power to take it the distance required and also provides 90 to 105 VAC 20 cycle ringing. They are boosting the circuit from the first location to the end point.

Sorry if I confused anyone trying to be clear.

The more copper you have between points on a dry pair, teh farther you can go. If I were trying to go 1000 feet with 6 pairs, I would put in at least 22 gage and run enough pairs to double up if possible.

There is so much labor involved that copper cost becomes secondary and it has to work the first time.

THE Bracha, old blond specialist in Rube Goldberg solutions.