Black Box COMPACT T1 MT850A - Manual (Page 403)

Compact T1 - Release 6.1 8-9
FXS Voice Card
LEDs
LEDs
Each FXS port has a corresponding LED, described in the table below. This chart
applies to all the FXS service cards.
State Loop Start
Meaning Ground Start Meaning
Off N/A Idle (tip open)
Green Idle Tip ground (incoming seizure)
Red N/A Ring ground (outgoing seizure)
Yellow Call in progress Call in progress
Flashing green Ringing Ringing