Nortel Networks 553-3001-211 manual LEDs are described in Table, NTBK50 faceplate LEDs Part 1

Page 764 of 894 NTBK50 2.0 Mb PRI card

The LEDs are described in Table 244.

Table 244

NTBK50 faceplate LEDs (Part 1 of 2)

LED	State	Definition
OOS	On (Red)	The NTBK50 2.0 Mb PRI circuit card is disabled or
		out-of-service. Also, the state of the card after power-up,
		completion of self test, and exiting remote loopback.
	Off	The NTBK50 2.0 Mb PRI is not in a disabled state.
ACT	On (Green)	The NTBK50 2.0 Mb PRI circuit card is in an active state.
	Off	The NTBK50 2.0 Mb PRI is in a disabled state. The OOS
		LED is red.
RED	On (Red)	A red alarm state has been detected. This represents a
		local alarm state of Loss of Carrier (LOS), Loss of Frame
		(LFAS), or Loss of CRC Multiframe (LMAS).
	Off	No red (local) alarm.
YEL	On (Yellow)	A yellow alarm state has been detected. This represents
		a remote alarm indication from the far end. The alarm
		may be either Alarm Indication (AIS) or Remote Alarm
		(RAI).
	Off	No yellow (remote) alarm.
LBK	On (Green)	2.0 Mb PRI is in loop-back mode.
	Off	2.0 Mb PRI is not in loop-back mode.
CC	On (Red)	The clock controller is software disabled.
	On (Green)	The clock controller is enabled and is either locked to a
		reference or is in free run mode.

553-3001-211 Standard 2.00 September 2004