User manual

Appendix B. Signaling States Vs. Mode of Operation
61200.080L1-1 FXS+ Dual Voice Option Module 29
Appendix B
Signaling States
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.
Table B-A
PLAR Mode
FXS+ FXS+
2W Input RX A RX B TX A TX B 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
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