Mike's PBX Cookbook

Replacing a Clock Controller

Use this procedure to replace a one of the following cards:

Note: Clock controllers cannot be mixed in one system.

LEDOnOff
Solid Red LEDDisabledEnabled
Solid Green LEDActiveInactive
A Dual-CPU system has two Clock controllers: CC 0 in shelf 0, and CC 1 in shelf 1.
Only one clock controller is active at a time, indicated by a Green LED.
If both LED's are off, the clock controller is in standby.
A Red LED indicates the card is disabled.

Always software and hardware disable an inactive clock controller (LD 60) in order to remove it!

Removing a CC card:

1. The clock controller must be on the inactive CPU side. If necessary, switch CPU's in LD 135: SCPU

2. Disable the clock controller card in LD 60:

Single-CPU:
DIS CC x disable clock controller, where x = 0 or 1

Dual-CPU:
a. Check status, and if active switch clocks.
SSCK x Get status of system clock, where x = 0 or 1
SWCK If the clock (for removal) is active, switch clocks

b. Make sure the other clock controller card is active and in free run mode.
SSCK x Get status of system clock, where x = 0 or 1
TRCK FRUN Set clock controller tracking to free run

c. Disable the inactive clock controller.
DIS CC x disable clock controller, where x = 0 or 1

3. Set the ENL/DIS switch to DIS, disconnect cables, and remove the card.

Caution: Always set ENL/DIS switches to DIS before disconnecting or connecting cables.

Installing a CC card:

1. Set the ENB/DIS switch to DIS on the replacement card.

2. Set option switches. (Refer to Avaya Circuit Card Reference).

3. Insert card, connect cables, and set the ENL/DIS switch to ENL

The faceplate LED flashes three times to indicate the self test has passed.

4. Software-enable the card: ENL CC x

In a Single-CPU system, the procedure is complete!
In a Dual-CPU system, continue with the following steps...

5. Switch CPUs in LD 135: SCPU

6. Activate the newly-installed card and verify that it is active in LD 60: SWCK, SSCK x

7. If applicable, issue a tracking command: TRCK aaa

"aaa" is PCK for track primary clock, SCLK for track secondary clock, or FRUN for free run mode.
Note: Configure the clock source to the status it was in before the replacement procedure.

8. Verify clock switch-over and tracking in LD 60: SWCK, SSCK x. Reset the error counters: RCNT.

Primary and secondary reference loops (PREF and SREF) are set in LD 73, FRUN is not sychronised (master).

CLKC300 errors:

If the following errors scroll, try disabling and re-enabling the NTRB53 with a forced download: ENL CC x FDL.

CLKC300 0 1 FROM: SYS DSBL - SELF TESTING TO: SYS DSBL - SELFTESTS PASSED
TIME: 14:29:42

CLKC300 0 1 FROM: SYS DSBL - SELFTESTS PASSED TO: SYS DSBL - SELF TESTING
TIME: 14:29:42
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