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Page 84 of 188
Clock Controller Installation
553-2901-200
Standard 11.00
Procedure 15
Installing the Clock Controller in the XN, XT, 71, and 81/ 81C
Note: Refer to the tables in this section to be sure you are using the
correct vintage.
1
Set faceplate ENL/DIS switch to DIS on new Clock Controller card.
2
If replacing an existing Clock Controller card, do the following:
— Disable only a card in standby state that is not active and is
associated with the standby CPU. Disable the card using the DIS
CC X command in LD 60.
Note: ERR 020 messages may be generated—ignore them. To avoid
exceeding maintenance or out-of-service thresholds, reset the error
counters (LCNT) for PRIs providing a reference clock for the Clock
Controller. Reset the counters using the RCNT command in LD 60.
— Set the old card's faceplate ENL/DIS switch to DIS.
— Disconnect the cables from the old Clock Controller card and
remove it from the shelf.
3
Install the new Clock Controller in the selected slot.
4
Run and connect the cables
— Connect the primary reference to J2.
— If available, connect the secondary reference to J1.
— Connect the cable from J3 on each controller card to the junctor
group connector, QPC417.
5
Set the faceplate ENL/DIS switch to ENL.
August 1996
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