Sonet Ssm Messages; Sdh Ssm Messages; Table 6-1 Sonet Ssm Generation 1 Message Set; Table 6-2 Sonet Ssm Generation 2 Message Set - Cisco ONS 15600 Reference Manual

6.3.1 SONET SSM Messages

6.3.1 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 15600 SDH, consult your timing reference documentation to determine which message set to use.
Table 6-1
Table 6-1
Message
PRS
STU
ST2
ST3
SMC
ST4
DUS
RES
Table 6-2
Message
PRS
STU
ST2
TNC
ST3E
ST3
SMC
ST4
DUS
RES

6.3.2 SDH SSM Messages

If you enable SDH SSM for the ONS 15600 SDH, consult your timing reference documentation to
determine which message set to use.
Note Mapping from DS1 SSM to E1 SSM is possible when DS1 timing is used on the 15600 SDH platform.
Table 6-3
Cisco ONS 15600 SDH Reference Manual, Release 9.0
6-4
and Table 6-2 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
shows the SDH SSM messages.
Chapter 6 Timing
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