Nortel Networks 553-3001-211 manual Faceplate LEDs, Free-run non-tracking

Page 726 of 894 NTAK20 Clock Controller daughterboard

Free-run (non-tracking)

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 system acts 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 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 232.

Table 232

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	NTAK20 is equipped and is attempting to lock (tracking
(Green)	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.

553-3001-211 Standard 2.00 September 2004