Page 34 of 66 DTI installation
553-2811-200
Standard 6.0
December 1994
Procedure 1
Installing the Clock Controller in the ST, STE, 21, 21E, MS, N, RT, 51, and
NT half group
Note: Refer to the tables in this section to be sure you are using the
correct vintage.
1
Set the ENL/DIS toggle switch to DIS (disable) on the new circuit card.
2
If replacing an existing card:
—
Perform a status check on the clock with the SSCK command in
LD 60. The new controller should have the same status.
—
Disable the old card 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. 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.
3
Disconnect cables from the old Clock Controller card and remove it 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.
4
Install the new Clock Controller in the selected slot.
CAUTION
The QCAD130 cable connecting the Clock Controller and DTI card
must NOT be routed through the center of the cabinet past the power
harness. Instead, it should be routed around the outside of the
equipment shelves.
