Using digital cable phone modem to backfeed house phone outlets?

Question

we just got phone service through our cox cable system here in san diego and they want 35 bux to add an additional phone jack... we need 5 d**n jacks and the house already had phone service.. cant you backfeed into 1 jack and power up all the others? I mean it's only "tip" and "ring"... maybe disconnect the incoming phone service tails so we don't blow the modem?

Answer 1

You should be able to back feed the dial tone from one jack and it should activate all of the other jacks, depending on how the jacks were wired it may require work.  If the the jacks were wired in a "loop system" they should all be active as soon as you send dial tone to one of them.  If they are wired in a "home-run system" it will require all the lines to be tied together at the d-marc.  The d-marc is usually located at the side of the house by the power meter in a box label "telephone network interface" or something similar.  If the house had dial tone from another provider before cox all of the lines should be tied together already, but you may have to disconnect a "registration or test jack" in the interface outside.

Answer 2

35 per jack is extremely cheap... i don't know how they can do it that cheap...

yes you can take a line cord and connect your modem to an existing jack to feed the existing jacks in your home, but you MUST remove the drop wire from the telephone company side of your NID