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FXS
2W Input
(Outgoing call from FXS+)
Loop Open
Loop Closed
(Incoming call to FXS+)
Loop Open
Loop Closed
61200.080L1-1
Appendix B. Signaling States Vs. Mode of Operation
See Tables B-C and B-D for descriptions of FXS mode for
signaling states.
RX A
RX B
X
1
X
1
X
0
X
0
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
FXS+ Dual Voice Option Module
FXS+ Mode (Loop-Start)
TX A
TX B
2W Output
0
1
No Ringing (Idle)
1
1
No Ringing
0
1
Ringing
1
1
No Ringing
Table B-C
FXS+
31
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