Seems like it should be up to Cox to make it right, not the alarm company. With the old wiring, the line went from the demarc to the alarm panel which would have a RJ-31 jack. The line would go into the alarm system on pins 4 and 5, and come back out on pins 1 and 8 to return to the house wiring connections by the demarc. By moving the demarc to the modem, wiring for the alarm would need to go on a dedicated pair from the modem back out to the old demarc, then to the alarm and house wiring as before. As many complaints as there have been on this board it would appear that Cox's installers only know how to install modems and walk away.
