Alcatel-Lucent 1643 AMS Applications And Planning Manual page 275

An SDH overview
Overhead bytes
The following table lists and defines the overhead associated with each SDH path and
line section.
Overhead byte
section
Regenerator section
Multiplex section
Path
SDH frame
The following figure illustrates the SDH frame sections and its set of overhead bytes.
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365-312-801R7.2
Issue 3, May 2007
Definition
Contains information that is used by all SDH equipment
including repeaters.
Used by all SDH equipment except repeaters.
The POH contains all the additional signals of the respective
hierarchy level so that a VC can be transmitted and switched
through independently of its contents.
Alcatel-Lucent - Proprietary
See notice on first page
SDH path and line sections
A-7