Black Box COMPACT T1 MT850A - Manual (Page 392)

7-8 Compact T1 - Release 6.1
FXO Voice Card
LEDs
LEDs
Each FXO port on a card has its own LED, described in the table below.
State Loop Start
Meaning Ground Start
Meaning Dial Pulse Termination
Meaning
Off N/A Idle (tip open) Idle (loop open)
Green Idle Tip ground
(incoming seizure) Incoming seizure
Red N/A Ring ground
(outgoing seizure) Loop closure (outgoing
seizure)
Yellow Call in progress Call in progress Call in progress (reverse
battery)
Flashing
green Ringing Ringing N/A