Nortel 1000 Installation And Commissioning Manual page 177

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Copyright © 2003-2007, Nortel Networks
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LD 135
SCPU Switch CPU
Note: Wait two minutes before proceeding to the next step.
CAUTION
The following procedure to faceplate disable the active
clock controller could impact service.
Disable the faceplate of the active clock controller to force the newly
installed clock controller to activate.
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
Verify that the clock controller is active. At the prompt, enter
LD 60
SSCK Get status of the new system clock, where x = 0 or 1
TRCK PCK Track primary clock, where x = 0 or 1
RCNT Resets all alarm counters of all digital cards
**** Exit the overlay
Note: Replacing the clock controller will generate errors on the
network equipment. It is recommended that all counters be reset.
Replace the remaining QPC775 or QPC471 clock controller card,
tag and disconnect the cables to the card you are removing.
Unhook the locking devices on the card and pull it out of the card
cage.
Set the ENB/DIS switch to DIS on the replacement card.
Set the option switches on the replacement card (NTRB53). Refer to
Table 67 "Clock Controller switch settings for NTRB53" (page
Nortel Communication Server 1000
ISDN Primary Rate Interface Installation and Commissioning
NN43001-301 02.03 Standard
Release 5.5 7 December 2007
Installation procedures 177
170).