SYNC (Port-Network Synchronization)
Issue 1 May 2002
8-1519555-233-143
Figure 8-92. Synchronization Troubleshooting, Fig 6 of 6
Notes for Sheet 1 through Sheet 6 flowcharts. (When checking for slip errors, use
the previous Table 8-590 on page 8-1513 and .):
1. Use the status synchronization command to determine whether
synchronization is enabled and to determine the on-line reference. If the
on-line reference is a Tone-Clock board, the switch is operating in free run
mode. If Stratum 3 is displayed, and no DS1s are connected to the
Stratum-3 clock or no DS1 connection existed to the Stratum-3 clock for
over 24 hours, then the Stratum-3 clock is in free run mode.
2. Check for slip errors against DS1-BD and UDS1-BD.
From
CSS problem is in switch, IPSI or Tone-Clock, EI, SNI,
SlipsonmanyEIs,
IPSIs or Tone-Clocks,
or SNIs associated
with an SN Carrier?
Figure 5
Yes
IPSI or Tone-Clock associated
with the reference PN one
at a time. If slips remain,
13
14
Escalate
Done
Slips remain?
Replace the EI, SNI, and
Replace the SNI, EI,
IPSI, or Tone-Clock
for PN with slips.
No
Yes No
No
Yes
Good reference, but
SN not in sync.
or DS1 in PNs other than the timing master PN.
replace the SNC.
Are slips
isolated to
a PN?
E
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