Alcatel-Lucent 1643 AMS - Example of Network Timing

Example of network Timing
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Introduction
Timing in a network can be realized in numerous ways and configurations. The
following example shows a timing chain with a regenerator loop and one PRC. The
quality levels indicated in the figure represent the information that is carried by the S1
byte of that signal.
Example of a timing chain with a regenerator loop
This network contains a station clock (PRC quality), a number of network elements
and an SSU. A dotted line indicates the outgoing timing signals, a straight arrow inside
a network element indicates the timing signal that is used to synchronize with. The
connection between the network elements can either be line signals or tributary ports.
Different types of timing
From left to right, the following types of network element timing can be identified:
• station clock timing
• line/tributary timing
• regenerator loop
• line/tributary timing.
SSU
DNU DNU DNU DNU
PRC PRC PRC PRC
Line/Tributary
timing
Line/Tributary
timing
Station clock
timing
Regenerator
loop
2MHz
PRC
quality
Timing provisioning
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Alcatel-Lucent - Proprietary
See notice on first page
365-312-807R7.2
Issue 4, May 2007