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

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ATM Cell Header

This section discusses the ATM cell header structure. The pertinent fields are shown in Figure B-6.

Figure B-6. ATM Cell Header for UNI

DSL transports ATM cells to the central office, and then the DSL traffic is switched as generic ATM in the ATM network. Understanding the ATM cell's header format and the usefulness of its individual fields is a requirement for understanding ATM's switching, error detection, congestion management, and CoS/QoS support.

The ATM cell is 53 bytes in length. When AAL5 is used for UBR traffic, the first 5 bytes are the ATM cell header, and the last 48 bytes are the cell payload. The ATM cell header consists ...

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