Nortel Communication Server 1000 Manual page 168

168 Clock Controller installation and removal
Table 91
Installing or replacing the QPC775 or NTRB53 Clock Controller (cont'd.)
Step Action
3
For the QPC441 3PE cards in Network Shelves housing Clock Controller cards:
Set option switch position 1 to OFF, and positions 2, 3, and 4 to ON (refer to
QPC441 3PE card schematic).
4
On the Clock Controller being added, set faceplate toggle switch to DISABLE.
5
When replacing an existing Clock Controller, make sure the existing card is
software disabled, using LD 60.
Note: ERR20 messages may be generated. These can usually be ignored.
However, excessive clock switching should be avoided, especially when counters
are near the maintenance or out-of-service thresholds.
Response: Excessive switching could generate threshold-exceeded messages or
cause the PRI to be automatically disabled.
6
Check the counters in LD 60. If necessary, reset the counters using the RCNT
command.
7
On the Clock Controller being replaced, set the faceplate toggle to DISABLE.
Note: Call processing will cease if the CC-to-CC cable (J3 connector) is connected and BOTH
Clock Controller cards are disabled by their faceplate switches.
8
Disconnect cables from Clock Controller card.
Response: If the Clock Controller to Clock Controller cable (connector J3) is
disconnected, the card in the active shelf will be active. The clock cannot be
switched unless this cable is connected at both ends. The clock status display will
indicate NO UART (no universal asynchronous receiver transmitter). This is normal,
however, do not perform a clock status check when receiving this code.
9
Remove card from shelf.
Response: If the Clock Controller card is removed from the active shelf, the
Peripheral Shelf (PS) card will distribute clock. If the Clock Controller to Clock
Controller cable (connector J3) is disconnected, and the faceplate switch of the
Clock Controller in the active shelf is or becomes disabled
Then clock control will become disabled and the PS card will distribute clock, and
when clock status is read by the CPU, the Clock Controller card will respond as
being active clock, but disabled.
10
Install replacement Clock Controller in the same slot.
The Clock Controller card can also be plugged into the active shelf without
switching the CPU.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 04.01 4 June 2010
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