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 loc al 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 chec k for slips on that reference.
6. Check for LOS, Blue, Yellow, and Red Alarms on the on-line reference
facility and fix those prob lems first. See the DS1-BD and/or UDS1-BD for
the error log entries associated with the above mentioned alarms. Replac e
the circuit pac ks one at a time and wait at least one hour to determine if
the problem has gone away. This proced ure is disruptive and should be
done after hours if possible . An alternative to replacing the tone-c lock
circuit pack in systems where the tone-clocks are duplicate d, is to run the
set tone-clock command to switch tone-clocks. If the problem g oes away,
the previously active tone-cloc k should be replac ed.
7. If a few facilities are experienc ing slips or are unusable referenc es, the
clock source for fac ilities with slips or that are unusable is not trac eable to
the same ultimate source as the cloc k source for the on-line reference
facility.
Examine the overall timing network for the interconnec ted DS-1 to
determine if the clock c an be traced b ack to a single source and i f the
reference designations for eac h location in the distribution of t iming is
supplied in ac cordance 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 loop s the transmit signal to the receive
signal and verifies that the exc essive slips or the unusable reference are
no longer observed.
This is a time consuming proc ess that disrupts service. You should
perform it after hours if the servic e being provided by the system is
acceptabl e as determined by c hecking 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 osc illator of a tone-clock
board is on-line, then the answer to this q uestion is "no".
9. Use display synchronization to find out what references, if any, are
administered. Use status synchronization to find out wheth er
synchronization is enabled .
10. If tone-clocks are dup licated, the set tone-clock command can be used
to switch tone-clocks. If s lips go away, then replace the tone-cloc k that
was just switched away from.