Black Box COMPACT T1 - Manual (Page 35)

Compact T1 - Release 6.1 31
Quick Start
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.