Nortel Networks 1000 - Manual (Page 809)

Physical description 809
intended to be a slave to an external network clock. Free-run mode can
occur when both the primary and secondary clock sources are lost due to
hardware faults or invoked using software commands.
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 Option 11C is used as a master clock source for other systems
in the network. Free-run mode is undesirable if the Option 11C 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.
In free-run mode, the clock controller does not synchronize on any outside
source. Instead, it provides its own internal clock to the system. This mode
can be used when the CS 1000 acts as a master clock source for other
systems in the network. Free-run mode is undesirable if the CS 1000 is
intended to be a slave to an external network clock. Free-run mode can
occur when both the primary and secondary clock sources are lost due to
hardware faults or invoked using software commands.
Physical description
Faceplate LEDs
Each motherboard has five DTI/PRI LEDs and one clock controller LED.
The clock controller LED is dual-color (red and green). The clock controller
LED states are described in
Table 335 "Faceplate LEDs" (page 809) .
Table 335
Faceplate LEDs
State Definition
On (Red) NTAK20 is equipped and disabled.
On (Green) NTAK20 is equipped, enabled, and is either locked to a
reference or is in free run mode.
Flashing
(Green) NTAK20 is equipped and is 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 may 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.
Each of the motherboards have 5 DTI/PRI LEDs and one clock controller
LED. The CC LED is dual-color (red and green), with states represented
as follows:
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.