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Appendix B
SIGNALLING STATES VS. MODE OF OPERATION
2W Input
Loop Open
Loop Closed
Loop Open
Loop Open
Loop Closed
61202300L1-1
Signalling States
The tables in this appendix describe the signalling states
for voice card and the DS-1 PCM stream. Ground start
signalling is not used in PLAR mode. See Table B-1.
FXS+
RX A
X
X
1
0
0
The A and B signal bit states on the DS-1 signal are as fol-
lows:
Signal
0
1
X
Loop Open
Loop Closed
FXS+ Quad Voice Option Module User Manual
RX B
TX A
X
1
X
0
1
1
X
1
X
0
Means
logic 0 is the DS-1 stream
logic 1 is the DS-1 stream
value is not significant
phone on-hook
phone off-hook
Table B-1. Plar Mode
TX B
FXS+
2W Output
1
_
0
_
1
No Ringing
1
Ringing
0
No Ringing
B-1
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