Sunday, September 6, 2009

Administrative Unit (AU-4) and Virtual Container (VC-4)

The actual payload carried in an STM-1 frame is encapsulated in an administrative unit
(AU-4). The AU-4 consists of a VC-4 virtual container comprising 261 columns plus a 9
octet wide AU-4 pointer that points to the first octet of the VC-4 payload container.

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