Sonet Ssm Messages; Table 10-1 Sonet Ssm Generation 1 Message Set; Table 10-2 Sonet Ssm Generation 2 Message Set; Sdh Ssm Messages - Cisco 15454-DS1-14= - 1.544Mbps Expansion Module Reference Manual

10.3.1 SONET SSM Messages

10.3.1 SONET SSM Messages
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 SONET SSM for the
ONS 15454, consult your timing reference documentation to determine which message set to use.
Table 10-1
Table 10-1
Message
PRS
STU
ST2
ST3
SMC
ST4
DUS
RES
Table 10-2
Message
PRS
STU
ST2
TNC
ST3E
ST3
SMC
ST4
DUS
RES

10.3.2 SDH SSM Messages

If you enable SDH SSM for the ONS 15454, consult your timing reference documentation to determine
which message set to use.
Table 10-3
Message
G811
STU
Cisco ONS 15454 Reference Manual, R8.5
10-4
and Table 10-2 show the SONET Generation 1 and Generation 2 message sets.
SONET SSM Generation 1 Message Set
Quality Description
1 Primary reference source—Stratum 1
2 Synchronization 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
SONET SSM Generation 2 Message Set
Quality Description
1 Primary reference source—Stratum 1
2 Synchronization 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
Table 10-3
SDH SSM Messages
Quality Description
1 Primary reference clock
2 Sync traceability unknown
shows the SDH SSM messages.
Chapter 10 Timing
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