DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1568SYNC (Synchronization)
9
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.
When slips occur on the circuit packs mentioned above, first consult the
individual circuit pack section in the manual for each circuit pack that has slips. If
slips occur in low numbers, they may be due to environmental conditions as
described above. If no service degradation is occurring, no action is necessary.
Whenever the system switches synchronization sources, slips can be expected
from DS1-BD, UDS1-BD, and EXP-INTF circuit packs. If service degradation
occurs, after following the repair steps in the individual section, use the following
trouble shooting techniques.
Table 9-594. Error Log Entries for Slip Errors
Circuit Pack Error Log Name
Error Log Entry
for Slips
DS1 Interface DS1-BD 3073 to 3160
Expansion Interface EXP-INTF 2305
Switch Node Interface SNI-BD 1537
Tone-Clock TDM-CLK 1025
UDS1 Interface UDS1-BD 3073 to 3160
