Nortel Circuit Card Installation Manual page 776

Page 776 of 906
Table 249
NTBK50 faceplate LEDs (Part 1 of 2)
LED
OOS
ACT
RED
YEL
LBK
CC
553-3001-211 Standard 3.00
NTBK50 2.0 Mb PRI card
The LEDs are described in Table 249.
State Definition
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.
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.
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.
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.
On (Green) 2.0 Mb PRI is in loop-back mode.
Off 2.0 Mb PRI is not in loop-back mode.
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.
August 2005