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Appendix C. Signaling States
FXO+
2W OUTPUT
Outgoing call from 2W port
Loop open, no ring ground
Loop open, no ring ground
Loop closed, no ring ground 1
Loop closed, no ring ground 1
Incoming call to 2W port
Loop open, no ring ground
Loop open, ring ground
Loop open, ring ground
Loop closed, no ring ground 1
3 0
RX A
RX B
0
1
0
1
1
1
0
1
0
0
0
0
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
See Tables C-B and C-C for descriptions of FXO mode
for signaling states.
FXO+ Dual Voice Option Module User Manual
FXO+ Ground Start Mode
TXA
TX B
2W INPUT
1
1
No tip ground, no ringing (idle)
Tip ground, no ringing
0
1
Tip ground, no ringing
0
1
Tip ground, no ringing
0
0
1
1
No tip ground, no ringing (idle)
1
1
No tip ground, no ringing
0
1
Tip ground, no ringing
0
1
Tip ground, no ringing
Table C-B
FXO+
61200.103L2-1
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