21-4
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
August 2005
Chapter 21 Timing Reference
21.3 Synchronization Status Messaging
ST2
3
Stratum 2
ST3
4
Stratum 3
SMC
5
SONET minimum clock
ST4
6
Stratum 4
DUS
7
Do not use for timing synchronization
RES
—
Reserved; quality level set by user
Table 21-2
SSM Generation 2 Message Set
Message
Quality
Description
PRS
1
Primary reference source—Stratum 1
STU
2
Synchronization traceability unknown
ST2
3
Stratum 2
TNC
4
Transit node clock
ST3E
5
Stratum 3E
ST3
6
Stratum 3
SMC
7
SONET minimum clock
ST4
8
Stratum 4
DUS
9
Do not use for timing synchronization
RES
—
Reserved; quality level set by user
Table 21-1
SSM Generation 1 Message Set (continued)
Message
Quality
Description
Summary of Contents for ONS 15454 DWDM
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