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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
Copyright © 2003-2007, Nortel Networks
.