Nortel Networks NN43001-301 manual Shelf slot assignment, Clock controller LED states

Hardware description 201

Free-run(non-tracking)In free-run mode, the clock controller does not synchronize on any source, it provides its own internal clock to the system. This mode can be used when the system is used as a master clock source for other systems in the network. Free-run mode is undesirable if the system is intended to be a slave. It can occur, however, when both the primary and secondary clock sources are lost due to hardware faults, or when invoked by using software commands.

Shelf slot assignment

For cabinet systems, the NTAK09 DTI/PRI card can be placed in main and expansion cabinets in any single card slot given in Table 74 "Shelf slot assignments for NTRB21, NTAK09, and NTAK20" (page 202).

Note: For CISPR B group cabinets, the active Clock Controller (NTAK20) can only occupy slots 1-3, 11-13, 21-23, 31-33, or 41-43 in an Option 11C cabinet. For FCC and/or CISPR A group cabinets, this limitation does not exist.

On non-CISPR B system cabinets, the NTAK20 can be placed in slots 1-9 of the Option 11C main cabinet. On cabinets NTAK11Dx and NTAK11Fx, the active NTAK20 must be placed in slots 1-3 (slots 4-10 cannot be used.)

On non-CISPR B IP expansion cabinets, the NTAK20 can be placed in slots 11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth expansion cabinets, respectively.

Clock controller LED states

The clock controller LED, on the NTAK09 or NTRB21 faceplates, is in various states depending on the status of the clock controller.

Table 73

Clock controller LEDs

LED	Clock controller
On (Red)	NTAK20 is equipped and disabled.
On (Green)	NTAK20 is equipped and is either locked to a reference
	or in free run mode.
Flashing (Green)	NTAK20 is equipped and attempting to lock (tracking
	mode) to a reference. If the LED flashes continuously
	over an extended period of time, check the CC STAT in
	LD 60. If the CC is tracking this can be an acceptable
	state. Check for slips and related clock controller error
	conditions. If none exist, then this state is acceptable,
	and the flashing is identifying jitter on the reference.
Off	NTAK20 is not equipped.

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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