Black Box COMPACT T1 User Manual
Page 35
Compact T1 - Release 6.1
31
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Controller Cards
LEDs
The T1 Controller has a set of six LEDs you can use to troubleshoot your Compact
T1. The table below describes each LED.
LED
State
Description
MAJOR
Off
No major alarms present
Red
Major alarm present
MINOR
Off
No minor alarms present
Yellow
Minor alarms present
LOCAL
Off
Remote mode (DIP switches disabled)
Green
Local mode (DIP switches enabled)
ACO
Off
Normal mode. No alarms are being
suppressed.
Yellow
Alarm cutoff active. One or more active
alarms suppressed.
T1-1 and
T1-2
Off
Off line
Green
Normal
Red
Loss of Signal (LOS) detected
Yellow
Bipolar Violation (BPV) detected
Flashing Green
Loopback active
Flashing Red
Loss of Frame (LOF) or Alarm Indication
Signal (AIS) detected
Flashing Yellow
Yellow alarm (Remote Alarm Indication)
detected.