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Vt payload pointer – EXFO IQS-8100 Series Transport Blazer for IQS-600 User Manual

Page 657

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Glossary

SONET/SDH Application

643

SDH - Lower-Order Path Overhead

VT Payload Pointer

The VT Payload Pointer provides a method of allowing flexible and
dynamic alignment of the VT SPE within the VT Superframe.

³

New Data Flag

NDF is enabled when at least 3 out of 4 bits match “1001”. NDF is
disabled when at least 3 out of 4 bits match “0110”.

³

Pointer Value

The pointer value indicates the offset between the V2 byte and the first
byte fo the VC-2/VC-1. The pointer bytes are not counted in the offset
calculation. The pointer is a binary number with the following range:

Path

Range

TU-2

0

427

TU-12

0

139

TU-11

0

103