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# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

AU Administrative Unit

An Administrative Unit is created during the process of forming the payload of an STM-1. The AU contains a pointer which identifies where in the payload the VC-4 (Virtual Container-4) data begins, thus differentiating between padding and data. The task of the AU is to provide adaptation between the Higher Order Channel Layer and the Multiplex Section Layer.
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