Black Box COMPACT T1 MT850A - Manual (Page 455)

Compact T1 - Release 6.1 12-11
Quad T1 Card
LEDs
LEDs
Each channel on the Quad T1 card has two LEDs. The description of the top LED is
shown below, the bottom LED is not used with this application.
State Description
Off Off line
Green Normal
Red Loss of Signal (LOS)
Yellow Bipolar Violation (BPV)
Flashing Green Loopback active
Flashing Yellow Yellow Alarm
(Remote Alarm Indication)
Flashing Red (Slow) Loss of Frame (LOF) or Alarm
Indication Signal (AIS)
Flashing Red (Fast) Self-test Failure
Top LED
(active)
Bottom LED
(not used)