SDH path and line sections
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This section describes and illustrates the SDH path and line sections.
SDH layers
SDH divides its processing functions into the following three path and line sections:
• Regenerator section
• Multiplex section
• Path
These three path and line sections are associated with
• Equipment that reflects the natural divisions in network spans
• Overhead bytes that carry information used by various network elements
Equipment layers
The following table lists and defines each SDH equipment path and line section.
Path and line
sections
Definition
Regenerator section A regenerator section describes the section between two network
elements. The network elements, however, do not necessarily
have to be regenerators.
Multiplex section A multiplex section is the section between two multiplexers. A
multiplex section is defined as that part of a path where no
multiplexing or demultiplexing of the STM-N frame takes place.
Path A path is the logical signal connection between two termination
points.
A path can be composed of a number of multiplex sections
which themselves can consist of several regenerator sections.
Path, MS and RS
The following figure illustrates the equipment path, multiplex sections and regenerator
sections in a signal path.
An SDH overview
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A-6
Alcatel-Lucent - Proprietary
See notice on first page
365-312-801R7.2
Issue 3, May 2007
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