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SYNC (Port-Network Synchronization)
Issue 1 June 2005 2157
Figure 132: Synchronization Troubleshooting, Fig. 3 of 4
4
Slips on
DS1 reference
facilities?
5
Is there a
loss-of-signal or
network alarm?
Fix DS1-BD and
UDS1-BD alarms.
YesYes
No No
Many
Are there
many facilities
with excessive slips?
Few
Replace circuit
packs:
– IPSI/Tone-Clock in
the PN
– DS1 in PN
7
Check the overall
timing network to
verify the source is
traceable back to the
same source
(for example, Hillsboro, Mo).
Use the facility fault
sectionalization technique
section with slip counts as
the pass/fail indication to
isolate the trouble.
Escalate, if the
problem is not fixed.
7
B
Problem is in PN,
IPSI’s Tone-Clock
Escalate
or DS1s.
5
6
5