DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1576SYNC (Synchronization)
9
5. Check
status synchronization
for the current DS1 reference. If a DS1 or
UDS1 is on-line, check for slips on that DS1 or UDS1. If Stratum 3
synchronization is administered and the Stratum 3 clock is used as the
reference (i.e. the tone-clock local oscillator is not on-line), follow the
procedure in step 3 to determine the DS1 reference used as input to the
Stratum 3 clock and check for slips on that reference.
6. Check for LOS, Blue, Yellow, and Red Alarms on the on-line reference
facility and fix those problems first. See the DS1-BD and/or UDS1-BD for
the error log entries associated with the above mentioned alarms. Replace
the circuit packs one at a time and wait at least one hour to determine if
the problem has gone away. This procedure is disruptive and should be
done after hours if possible. An alternative to replacing the tone-clock
circuit pack in systems where the tone-clocks are duplicated, is to run the
set tone-clock
command to switch tone-clocks. If the problem goes away,
the previously active tone-clock should be replaced.
7. If a few facilities are experiencing slips or are unusable references, the
clock source for facilities with slips or that are unusable is not traceable to
the same ultimate source as the clock source for the on-line reference
facility.
Examine the overall timing network for the interconnected DS-1 to
determine if the clock can be traced back to a single source and if the
reference designations for each location in the distribution of timing is
supplied in accordance with the
synchronization plan
for the customer.
Examine the capability of the external transmission equipment to pass or
provide timing.
Verify the integrity of the on-site hardware by using the
Facility Fault
Sectionalization
section, which loops the transmit signal to the receive
signal and verifies that the excessive slips or the unusable reference are
no longer observed.
This is a time consuming process that disrupts service. You should
perform it after hours if the service being provided by the system is
acceptable as determined by checking with the customer.
8. Use
status synchronization
to determine the on-line reference. If a DS1
or Stratum 3 reference is not on-line and the local oscillator of a tone-clock
board is on-line, then the answer to this question is "no".
9. Use display synchronization to find out what references, if any, are
administered. Use status synchronization to find out whether
synchronization is enabled.
10. If tone-clocks are duplicated, the set tone-clock command can be used
to switch tone-clocks. If slips go away, then replace the tone-clock that
was just switched away from.
