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SYNC (Port-Network Synchronization)
Issue 1 June 2005 2153
Figure 128: Synchronization Troubleshooting, Fig. 4 of 5
8
Done
Escalate
From Figure
1, 2, or 3
.
Slipsonmorethan
one slave PN?
8
Slips remain?
Replace
Tone-Clock
slave PN.
Slips remain?
Yes
No
No
To Fig 5
in timing
D
Replace Tone-Clock or IPSI
in Master timing PN.
F
9
Yes
Many DS1 spans
with slips in the
PN containing the
master reference?
No
Yes
CSS
DC
For an S8xxx media server Multi-connect CSS, the problem
is in the IPSI or Tone Clock, EI, or SNI of the PN containing
the master reference. If equipped, switch PNC and/or system
tone clocks to try and change the symptoms. Then change
circuit packs above, one at a time.
Center Stage
Switch (CSS) or
Direct Connect (DC)?
Inspect fiber cables between the timing
master and slave PN for connectivity
issues. Look for crimped cables, loose
connections, bent pins, etc.
Replace expansion interface (EI) boards
between the timing master and the slave
PN with slips.
YES
NO
(The current PN providing
sync source)