Nortel Communication Server 1000S Installation And Configuration Manual page 212

Page 212 of 394
553-3001-201 Standard 2.00
Clock Controller description and installation
5 Replacing a clock controller, do the following:
— Perform a status check on the clock with the SSCK command in
LD 60. The new controller should have the same status.
Note: ERR20 messages can 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.
a. Set the old card's faceplate ENL/DIS switch to DIS.
b. Disconnect the cables from the old clock controller card and remove
the card from the shelf.
6 Adjust the 3PE switches to recognize the clock controller card.
7 Set faceplate ENL/DIS switch to DIS.
8 Install the clock controller in the selected slot.
9 Run and connect cables
a. Connect the primary reference to J2.
b. If available, connect the secondary reference to J1.
c. Connect the cable between the two clocks to J3 on each controller
card.
10 Set the faceplate ENL/DIS switch to ENL.
Note: Verify that the faceplate LED flashes three times to ensure the
clock controller self test passed.
11 Enable the clock controller by entering ENL CC x in LD 60.
12 Set the error detection thresholds and clock synchronization controls in
LD 73. (Optional with card replacement; required with new installation.)
13 Track on a primary or secondary reference clock, use LD 60. Use the
following command:
TRCK PCK
SCLK
FRUN
September 2004
(for primary)
(for secondary)
(for free-run)