Nortel 1000E Maintenance Manual page 38

Page 38 of 162 Hardware maintenance tools
Table 4
NTBK50 faceplate LEDs (Part 1 of 2)
LED
OOS
ACT
RED
YEL
LBK
CC
553-3041-500 Standard 1.00
The NTBK50 2 Mbit PRI circuit card LEDs are described in Table 4.
State Definition
On (Red) The NTBK50 2 Mbit PRI circuit card is either 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 Mbit PRI is not in disabled state.
On (Green) The NTBK50 2 Mbit PRI circuit card is in active state.
Off The NTBK50 2 Mbit PRI is in 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 Multi-frame (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
can be either Alarm Indication (AIS) or Remote Alarm
(RAI).
Off No yellow (remote) alarm.
On (Green) The NTBK50 2 Mbit PRI is in loopback mode.
Off The NTBK50 2 Mbit PRI is not in loopback 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.
September 2004