Abstract: A method and architecture for transitioning the embedded base of Digital Loop Carrier access systems from the current narrowband circuit-switched paradigm—i.e., Synchronous Transfer Mode transport and Time division Multiplexed—to an Asynchronous Transfer Mode transport and ATM network interface paradigm. The invention operates to terminate the control data links from legacy DLC equipment, and to provide a protocol conversion function that enables these links to interface with the associated control and call processing structures of a serving packet switch. An additional function of the invention is the interfacing for bearer channels of the STM feeders from the legacy DLC and the provision of a Synchronous to Asynchronous Conversion function on such feeders.