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Appendix B. Signaling States Vs. Mode of Operation
FXS+
RX A
2W Input
(Outgoing call from FXS+)
Loop Open
Loop Closed
Loop Closed
Loop Closed
Loop Closed
(Incoming call to FXS+)
Loop Open
Loop Closed
Loop Closed
30
Ground start signaling provides its own tip ground in
response to ring ground in the Tandem Mode. See
Table B-B.
RX B TX A
0
X
0
0
X
1
1
X
1
0
X
1
1
X
1
0
X
0
1
X
0
1
X
1
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+
2W Output
TX B
0
—
1
—
1
Dial Tone
1
1
-
0
Ringing
0
Answers
1
Table B-B
Tandem Mode
Switch to FXS+
Condition
Idle
Idle
Wink
Wink Done
Answer Far End
Idle
Far end off hook
Far end off hook
61200.080L1-1
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