Nortel Networks NN43001-301 manual End

174Clock Controller description and installation

Note 2: 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 it from the shelf.

6Install the new clock controller in the selected slot.

7Run and connect the cables

a.Connect the primary reference to J2.

b.Connect the secondary reference to J, if available.

c.Connect the cable from J3 on each controller card to the junctor group connector.

8Set the faceplate ENL/DIS switch to ENL.

9Execute the ENL CC X command in LD 60. The faceplate LED should go to the OFF state.

10Set the error detection thresholds and clock synchronization controls in LD 73. (Optional if replacing card; required with new installation.)

11Track on a primary or secondary reference clock, use LD 60. The command follows:

TRCK	PCK	(for primary)
	SCLK	(for secondary)
	FRUN	(for free-run)

12Issue the status check command, SSCK.

13(Optional) Wait two minutes before activating the newly installed clock controller with the LD 60 SWCK command.

Note: This allows a smooth transition of the clock controller upgrade.

14Repeat for the second clock controller, if necessary.

—End—

Nortel Communication Server 1000

ISDN Primary Rate Interface Installation and Commissioning

NN43001-301 02.03 Standard

Release 5.5 7 December 2007

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