SYNC (Port-Network Synchronization)
Issue 1 May 2002
8-1531555-233-143
If the primary synchronization reference is providing the
system’s timing, check the synchronization references
administered, and follow the steps outlined in note (a). If the
secondary reference is providing timing, follow note (c).
■ If the slave Tone-Clock circuit pack fails TDM Bus Clock Test
#150 but the master Tone-Clock does not fail this test, the
master Tone-Clock circuit pack must be replaced. Follow the
Tone-Clock replacement steps listed in “TDM-CLK”.
■ Replace the active Expansion Interface circuit pack in the
master port network.
■ In a CSS configuration, replace the Switch Node Interface
circuit pack connected to the active Expansion Interface
circuit pack in the master port network. The list fiber-link
command can be used to determine the Switch Node
Interface circuit pack that is connected to the active
Expansion Interface circuit pack in the master port network.
■ If the problem persists and any slip errors remain, follow the
procedures described in the troubleshooting section above.
This error is cleared by a leaky bucket strategy and takes one hour to clear
(leak away) the error counter once it is alarmed. Therefore, it may take up
to one hour to clear the alarm after the problem is cleared.
h. Noise on the DS1 line can cause transient alarms on synchronization.
Therefore, when a sync problem occurs on error types 1, 257, or 513, a
WARNING alarm is first raised for 15 to 20 minutes before the alarm is
upgraded to a MINOR or MAJOR alarm.
System Technician-Demanded Tests:
Descriptions and Error Codes
Always investigate tests in the order presented in the table below when inspecting
errors in the system.
If Stratum 3 is administered via change synchronization, the Stratum-3 Clock
Alarm Query test (#649) will also execute when the test synchronization
command is run. Test #649 is described in ‘‘Stratum-3 Synchronization’’.
Order of Investigation
Short Test
Sequence
Long Test
Sequence D/ND
1
1. D = Destructive, ND = Non-destructive
Test Synchronization test (#417) X X ND
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