System and method for ringing other subscriber telephones connected to a telephone line during data communications on the telephone line

Abstract

A system and method for enabling a subscriber to receive incoming telephone calls on a telephone line and ring all of the telephones connected to a first conductor pair inside the subscriber's premises, wherein the first conductor pair would have normally been connected to the line. The telephones may be rung even when the subscriber is performing data communications with a remote data site on the telephone line. This obviates the necessity of the subscriber having to purchase a second telephone line for incoming calls while data communications are being performed, thus reducing access costs. The system and method shown advantageously employs a wiring device to reroute the telephone line from the first conductor pair connected to the phones to a second conductor pair normally not used. The system and method further employs a modem which receives telephone signals from the telephone line via the second conductor pair. The modem comprises a Central Office (CO) simulator circuit coupled to the first conductor pair which regenerates the telephone signals, such as a ringing voltage, to the telephones via the first conductor pair. When the modem is performing data communications with a remote data site, the remote data site also sends signals, such as data frames or IP packets, to the modem indicating that an incoming call has been placed to the telephone line. In response to the received signals, the modem controls the CO simulator to ring the extensions. The modem further comprises a relay which couples the first conductor pair to the second conductor pair when the modem is on hook with respect to the second conductor pair, thereby enabling normal speech communications to be performed by the subscriber on the telephone line. The relay couples the first conductor pair to the CO simulator when the modem is off hook with respect to the second conductor pair, thereby enabling the CO simulator to ring the telephones. In an alternate embodiment, the relay is comprised within an external wiring device coupled between the modem and conductor pairs and also includes a ring generator to alleviate the modem from having a ring generator for low power or real estate-constrained applications, such as in a notebook computer.