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Electrical Wire and Cable

Digital Phone Jack Wiring

I just moved into a new house (to me). Got digital phone via cable. If I plug a standard phone into the supplied modem, phones elsewhere in the house I get dial tone, but they will not ring on an incoming call…


Standard Telephones and Digital Phone Jack Wiring
Question: Here’s a goofy question- I just moved into a new house (to me). Got digital phone via cable. If I plug a standard phone into the supplied modem, all is good, phone works. NOW- If I take a standard phone (RJ-11) cable from the modem to a wall plate, I thought that I would be able to use phones elsewhere in the house by plugging them into wall jacks. I get dial tone, but they will not ring on an incoming call! The existing phone wiring is isolated from the street, by the way. Am I reversing polarity by back feeding this way, or ?

This electrical question came from: Jon, a Homeowner from Portland, Oregon

Dave’s Reply:
Thanks for your electrical question Jon.
Jon, check with the type of digital service you have and which phones and wiring are compatible with that system. Check out my VOIP Telephones page to see alternate connections that may help.

The Following links will assist you with your electrical question:

Telephone Wiring Diagram

Electrical Wire for the Home

For more information about Phone Jack Wiring
Telephone Wiring
Telephone Wiring
Phone Jack Wiring
This telephone wiring diagram with photos and instructions will show you the direct steps to correctly wiring a telephone jack.


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