Phone line polarity

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peabody
Posts: 126
Joined: Wed Feb 20, 2013 10:02 pm

Phone line polarity

Post by peabody » Wed Mar 06, 2013 8:53 pm

The line polarity at the Telo's phone jack is correct, but when I connect a normal phone cord from that jack to a wall jack to drive the rest of my house, that reverses the polarity at all the house jacks. I think that's because a normal phone cord is actually a crossover cord. Do they make straight-through phone cords, or adaptors that reverse polarity?

I know for most phones it doesn't make any difference, but I have some Hold circuits that require correct polarity.

murphy
Posts: 7241
Joined: Tue Jan 27, 2009 12:49 pm
Location: Pennsylvania

Re: Phone line polarity

Post by murphy » Thu Mar 07, 2013 3:35 am

Today I don't think manufacturers pay any attention to phone cord polarity. Try a few more cords to see if you have one that will fix your problem.

or

Rewire the jack that you are connecting the Telo to.

http://www.ehow.com/how_6329698_fix-rev ... iring.html

or

Get an inexpensive crimper and some crimp on plugs and make one yourself.

http://www.amazon.com/Leviton-C0260-I-P ... B00004YUMD
Customer since January 2009
Telo with 2 Handsets, a Linx, and a Safety Phone
Telo2 with 2 Handsets and a Linx

peabody
Posts: 126
Joined: Wed Feb 20, 2013 10:02 pm

Re: Phone line polarity

Post by peabody » Thu Mar 07, 2013 6:21 am

I checked in the box my old DSL modem came in, and found not just one, but two straight-through cords - a long one and a short one. I'm not sure why a DSL modem would need them, but there they are. Anyway, that solves the problem.

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