Nortel 1000 Installation And Commissioning Manual page 172

172 Clock Controller description and installation
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Copyright © 2003-2007, Nortel Networks
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Set the ENL/DIS toggle switch to DIS (disable).
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.
Adjust the 3PE switches to recognize the clock controller card.
Set faceplate ENL/DIS switch to DIS.
Install the clock controller in the selected slot.
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.
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.
Enable the clock controller by entering ENL CC x in LD 60.
Set the error detection thresholds and clock synchronization controls
in LD 73. (Optional with card replacement; required with new
installation.)
Track on a primary or secondary reference clock, use LD 60. Use
the following command:
Nortel Communication Server 1000
ISDN Primary Rate Interface Installation and Commissioning
NN43001-301 02.03 Standard
Release 5.5 7 December 2007