Patent ID: 7016374

Claim:
An S/U converter comprising: a subscriber network interface circuit for receiving and transmitting S-type signals utilized on 4-wire digital connections, said circuit comprising a first source of timing signals that is responsive to received S-type signals; a digital subscriber line interface circuit for receiving and transmitting U-type signals utilized on 2-wire digital connections, said circuit comprising a second source of timing signals that is responsive to received U-type signals; a sync circuit, connected between said subscriber network interface circuit and said digital subscriber line interface circuit and being operable in a first mode and a second mode, in said first mode, said sync circuit receives a first timing signal from said first source of timing signals and in response to said first source timing signals generates and provides a second timing signal to said digital subscriber line interface circuit, and in said second mode, said sync circuit provides a third timing signal to said digital subscriber line interface circuit; and a controller operative to determine the mode of the converter and control the activation of said circuits.