DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1567SYNC (Synchronization)
9
The change synchronization command is used to administer whether Stratum 3
or Stratum 4 synchronization is being used . The change synchronization
command allows primar y and secondary references to be administered for the
Stratum 4 option.
The status synchronization c ommand shows the current synchronizat ion
reference. The display synchronization command shows the sync hronization
references (e.g. primary, second ary, stratum 3) that are administered.
The list timing-source comm and displays all DS1 and UDS1 locations th at are
allowed to be administered as primary or secondary referenc es with the change
synchronization command.
Other commands associated with Synchronization Maintenance are disable
synchronization-switch and enable synchronization-switch. These
commands are used to d isable the ability of Synchronization Maintenanc e to
switch between synch ronization references and to enable this switc hing ability,
respectively. The set synchronization command is executed only after
synchronization has been d isabled and is used t o manually switch to a specif ic
synchronization reference. This command i s useful to diagnose synchronization
problems by forcing a specific referenc e (DS1, UDS1, or Tone-Clock) to be the
system synchronization reference to d etermine if a specific referenc e is providing
a valid timing signal. To switch synchronizatio n to the Stratum 3 clock, use the
enable synchronization-switch command after veri fying that the Stratum 3
clock is wired c orrectly.
Approach to Troubleshooting
Slip errors are the primary symptom assoc iated with being unsync hronized.
A correct Synchronization plan for the network keeps the systems within the
network transmitting data at ap proximately the same rate to avoid situations
where:
■One system transmits data at a rate faster than another syste m can
receive the data (in which c ase data is lost).
■One system transmits data at a rate slower than another system expec ts to
receive data (in which c ase data is repeated).
Either of these situations, data being lost or rep eated, is a slip.
When troubleshooting synchronization p roblems when slips are the primar y error
log entry indications o f a synchronization problem, requires that the problem be
isolated to:
■A problem outside of the switc h, i.e., the switch is not prope rly
synchronized to the rest of the network.
■A problem internal to the switc h.