Nortel Communication Server 1000S Installation And Configuration Manual page 217

Clock Controller description and installation
8 Switch to the core with the new clock. At the prompt, enter:
LD 135
SCPU
Note: Wait two minutes before proceeding to the next step.
CAUTION
The following procedure to faceplate disable the
active clock controller could impact service.
9 Disable the faceplate of the active clock controller to force the newly
installed clock controller to activate.
10 Disconnect the Clock-to-Clock faceplate cable to J3 of the new clock
controller card in the active CPU side.
CAUTION
Active calls will experience noise over local and
trunk calls
11 Verify that the clock controller is active. At the prompt, enter:
LD 60
SSCK
TRCK PCK
RCNT
****
Note: Replacing the clock controller will generate errors on the network
equipment. It is recommended that all counters be reset.
12 Replace the remaining QPC775 or QPC471 clock controller card, tag and
disconnect the cables to the card you are removing.
13 Unhook the locking devices on the card and pull it out of the card cage.
14 Set the ENB/DIS switch to DIS on the replacement card.
15 Set the option switches on the replacement card (NTRB53). Refer to
Table 67 on page
ISDN Primary Rate Interface
Switch CPU
Get status of the new system clock, where x = 0 or 1
Track primary clock, where x = 0 or 1
Resets all alarm counters of all digital cards
Exit the overlay
210.
Page 217 of 394
Installation and Configuration