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SIGNALING STATES VS. MODE OF OPERATION
FXS+
2W Input
Loop Open
Loop Closed
Loop Open
Loop Open
Loop Closed
61200.080L1-1
Appendix B. Signaling States Vs. Mode of Operation
The four tables in this appendix describe the signaling
states for voice card and the DS-1 PCM stream.
Ground start signaling is not used in PLAR mode. See
Table B-A.
RX A
RX B
X
X
X
X
1
1
0
X
0
X
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
Appendix B
Signaling States
TX A
TX B
2W Output
1
1
0
0
1
1
No Ringing
1
1
Ringing
0
0
No Ringing
Table B-A
PLAR Mode
FXS+
-
-
29
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