DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1581SYNC (Synchronization)
9
Synchronization Switches Away from the Current Timing Reference
Synchronization will switch away from a DS1 reference (primary or secondary) if
the current DS1 reference is not providing a valid timing signal. The other DS1
reference will be used if one is administered and providing a valid timing signal.
Otherwise, the local oscillator of the Tone-Clock circuit pack in the same port
network as the DS1 reference will be used. The following conditions will cause a
synchronization switch:
■ The current DS1 reference is not inserted (i.e.
list configuration board
UUCSS
shows "no board").
■ The current DS1 reference has a loss of signal error (DS1-BD and
UDS1-BD error type 1281), a blue alarm error (DS1-BD and UDS1-BD
error type 1793), a red alarm error (DS1-BD and UDS1-BD error type
2049), or a hyperactive angel error (DS1-BD and UDS1-BD error type
1538). A corresponding alarm log entry is not required.
■ DS1 and UDS1 circuit packs can be administered with slips detection
enabled via the
Slip Detection?
field set to a
y
(see the
add ds1
,
change
ds1
, and
display ds1
commands). 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 if the other administered reference does not
have the above two conditions. The
list measurements ds1-log
command can be used to get an historical perspective of DS1 facility
operation.
The following conditions will cause a switch to the other DS1 reference if one
exists and the other DS1 reference is more healthy:
■ The current DS1 reference has a misframe error (DS1-BD error type 3329
to 3345 or UDS1-BD error type 3585-3601). A corresponding alarm log
entry is not required.
■ The current DS1 reference has a slip alarm (DS1-BD and UDS1-BD error
type 3073 to 3160). A corresponding alarm log entry is required.
If the above conditions are repaired and no longer apply, synchronization will
switch back to the primary reference.
Tone-Clock Circuit Pack LEDs
The yellow and green LEDs of the TN768 and TN780 Tone-Clock circuit packs
flash in a specific pattern to indicate the status of the circuit pack. For example,
these flashing LED patterns are used to indicate if a Tone-Clock circuit pack is
deriving timing from an external source or whether the Tone-Clock circuit pack is
providing the timing signal for the port network.
