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End-to-End DSL Architectures by Wayne C. Vermillion

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The ATM Network

An ATM network consists of a set of ATM switches interconnected by point-to-point ATM links. ATM switches support two kinds of interfaces: User-Network Interfaces (UNIs) and Network-Network Interfaces (NNIs). Slightly different ATM cell header formats are defined in UNI and NNI. The DSL world, being limited to the last mile between the customer premises and the central office, relates to the UNI environment. These UNI ATM cells comprise 53 bytes, with 48 bytes for the data payload plus 5 bytes of ATM header information. Generally, a UNI connects ATM end systems (such as hosts and routers) to an ATM switch. In the DSL world, the ATM end system is the user's DSL transceiver, and the ATM switch is the DSLAM/IP-DSL switch.

An NNI ...

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