Avaya S8700 Maintenance Manual page 341

SYNC (Port-Network Synchronization)
When troubleshooting synchronization problems when slips are the primary error
log entry indications of a synchronization problem, requires that the problem be
isolated to:
A problem outside of the switch (That is, the switch is not properly
synchronized to the rest of the network.)
A problem internal to the switch
DS1 and UDS1 circuit packs can be administered with slip detection enabled via
the Slip Detection? field set to a y (see the add ds1, change ds1, and display
ds1 commands). All DS1 and UDS1 circuit packs administered as slip enabled
will be counted in the following algorithm:
When over half of the DS1 and UDS1 circuit packs administered as slip enabled
are experiencing slips, and the primary or secondary synchronization reference is
the current synchronization reference, synchronization will try the other
administered synchronization reference.
In situations where one or many circuit packs in the system are experiencing slips,
the problem could be with the synchronization reference, with individual circuit
packs, or with phase modulation of the transmitted digital bit streams due to
environmental variations of the transmission facilities (such as temperature
variations that affect the electrical length of a transmission line). The circuit packs
that can experience slips and the associated error log entry for slips are as follows
in Table 8-447:
Table 8-447. Error Log Entries for Slip Errors
Circuit Pack
DS1 Interface
IPSI's Tone-Clock circuit
UDS1 Interface
When slips occur on any of these circuit packs, first consult the individual circuit
pack's section in this manual. If slips occur in small amounts, they may be due to
environmental conditions as previously described. If no service degradation is
occurring, no action is necessary. Whenever the system switches
synchronization sources, slips can be expected from DS1-BD and UDS1-BD
circuit packs. If service degradation occurs, after following the repair steps in the
individual section, use the following trouble shooting techniques.
555-233-142
Error Log Name Error Log Entry for Slips
DS1-BD 3073 – 3160
TDM-CLK 1025
UDS1-BD 3073 – 3160
Issue 1 May 2002 8-1037