ADTRAN 1202300L1, User Manual

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61202300L1-1 FXS+ Quad Voice Option Module User Manual B-1
Appendix B
Signalling States
SIGNALLING STATES VS. MODE OF OPERATION
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.
The A and B signal bit states on the DS-1 signal are as fol-
lows:
Table B-1. Plar Mode
FXS+
2W Input
RX A RX B TX A TX B FXS+
2W Output
Loop Open X X 1 1 _
Loop Closed X X 0 0 _
Loop Open 1 1 1 1 No Ringing
Loop Open 0 X 1 1 Ringing
Loop Closed 0 X 0 0 No Ringing
Signal Means
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