A system is disclosed that provides voice, signaling and data communications between customer premises equipment (CPE) and network equipment using a digital subscriber line. If the trained rate of the line is sufficient to meet bandwidth requirements for all communication channels, the system schedules cells for transmission according to the asynchronous transfer mode (ATM) traffic management standard. If the trained rate of the line is insufficient to meet bandwidth requirements for all communications channels, the system schedules cells for transmission using a combination of priority queuing and the ATM traffic management standard.
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