User manual

Appendix B. Signaling States Vs. Mode of Operation
61200.080L1-1 FXS+ Dual Voice Option Module 31
See Tables B-C and B-D for descriptions of FXS mode for
signaling states.
Table B-C
FXS+ Mode (Loop-Start)
FXS FXS+
2W Input RX A RX B TX A TX B 2W Output
(Outgoing call from FXS+)
Loop Open X 1 0 1 No Ringing (Idle)
Loop Closed X 1 1 1 No Ringing
(Incoming call to FXS+)
Loop Open X 0 0 1 Ringing
Loop Closed X 0 1 1 No Ringing
The A and B signal bit states on the DS-1 signal are as
follows:
0 = logic 0 is the DS-1 stream
1 = logic 1 is the DS-1 stream
X = value is not significant
Loop Open = phone on-hook
Loop Closed = phone off-hook