While traditionally access networks based on Digital Subscriber Line (DSL) technology offer high-speed Internet access to residential users over a legacy copper pair, today's trend is to upgrade the DSL modem and enhance the DSL Access Multiplexer (DSLAM), allowing (additional) phone calls to be transported over the DSL bit pipe. In today's scenario, the voice signal is transported using the Asynchronous Transfer Mode (ATM) up to the DSLAM where it is further switched over the public network. In a Next Generation Network (NGN), in contrast, the public network is no longer involved and so voice is transported end-to-end over ATM. This article shows that the same quality levels as in today's public network can be achieved both in today's voice-over-DSL scenario and in the NGN scenario. Furthermore, the NGN scenario has the advantage that it reduces the mouth-to-ear delay and avoids transcoding.
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