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NTBK50 2.0 Mb PRI card Page 495 of 544
Option 11C and 11C Mini Technical Reference Guide
In general, the LEDs operate as shown in Table 153.
Table 153
NTBK50 faceplate LEDs (Part 1 of 2)
LED State Definition
OOS On (Red) The NTBK50 2.0 Mb 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 2.0 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