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Page 82 of 188
Clock Controller Installation
Installing the Clock Controller in a single group
553-2901-200
Standard 11.00
Procedure 13
Installing the Clock Controller in the NT, 61/ 61C
Note: Refer to the tables in this section to be sure you are using the
correct vintage.
Procedure 14
1
Set faceplate ENL/DIS switch to DIS (disable) on the new circuit card.
2
If replacing an existing card, do the following:
— Perform a status check on the clock with the SSCK command.
The new card should have the same status.
— Disable the old card using LD 60. (Only a card in standby state
associated with a standby CPU can be disabled using software.)
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. Excessive switching could generate threshold-exceeded
messages or cause the PRI to be automatically disabled. Check the
counters in LD 60. If necessary, reset the counters using the RCNT
command.
— Set the old card's faceplate ENL/DIS switch to DIS.
— Disconnect the cables from the old Clock Controller card and
remove the card from the shelf.
Note: The Clock Controller status display in this mode indicates NO
UART (no universal async receiver transmitter). Do not perform a
clock status check when receiving this code.
3
If the 3PE switches have not been modified to recognize the Clock
Controller card, adjust them as follows:
QSD39 (left-hand side)
SW2 ON
SW4 OFF
QSD40 (right-hand side)
SW2 ON
SW4 OFF
SW8 OFF
August 1996
SW1 OFF (Option 61 shelf 0)
SW1 OFF (Option 61 shelf 1)
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