Synchronization Status Messaging; Procedure: Set Up Ons 15454 Timing; Table 3-4 Ssm Generation 1 Message Set; Table 3-5 Ssm Generation 2 Message Set - Cisco 15454-TCC - Network Processor Card Operation Manual

Setting Up ONS 15454 Timing

3.6.2 Synchronization Status Messaging

Synchronization Status Messaging (SSM) is a SONET protocol that communicates information about
the quality of the timing source. SSM messages are carried on the S1 byte of the SONET Line layer.
They enable SONET devices to automatically select the highest quality timing reference and to avoid
timing loops.
SSM messages are either Generation 1 or Generation 2. Generation 1 is the first and most widely
deployed SSM message set. Generation 2 is a newer version. If you enable SSM for the ONS 15454,
consult your timing reference documentation to determine which message set to use.
Table 3-5
Table 3-4
Message
PRS
STU
ST2
ST3
SMC
ST4
DUS
RES
Table 3-5
Message
PRS
STU
ST2
TNC
ST3E
ST3
SMC
ST4
DUS
RES

Procedure: Set up ONS 15454 Timing

From the CTC node view, click the Provisioning > Timing tabs
Step 1
In the General Timing section, complete the following information:
Step 2
Cisco ONS 15454 Installation and Operations Guide
3-14
show the Generation 1 and Generation 2 message sets.
SSM Generation 1 Message Set
Quality Description
1 Primary reference source – Stratum 1
2 Sync traceability unknown
3 Stratum 2
4 Stratum 3
5 SONET minimum clock
6 Stratum 4
7 Do not use for timing synchronization
Reserved; quality level set by user
SSM Generation 2 Message Set
Quality Description
1 Primary reference source - Stratum 1
2 Sync traceability unknown
3 Stratum 2
4 Transit node clock
5 Stratum 3E
6 Stratum 3
7 SONET minimum clock
8 Stratum 4
9 Do not use for timing synchronization
Reserved; quality level set by user
Chapter 3
Table 3-4
(Figure 3-9).
November 2001
Node Setup
and