ADTRAN 1202300L1, User Manual

Page: 49 / 54

Appendix B. Signalling States
61202300L1-1 FXS+ Quad Voice Option Module User Manual B-7
The A and B signal bit states on the DS-1 signal are as fol-
lows:
Table B-7. UVG Mode: Ground Start Provisioning on T-Span
FXS+2W
Input
RX A RX B TX A TX B FXS+2W Output
(Outgoing call from FXS+)
Loop Open 0 0 0 0 No Ringing (Ground
Start)
Ring Ground 0 0 0 1 No Tip Ground
Loop Closed 0 1/0 1 0 Tip Ground
Loop Closed 1/0 1/0 1 0 Reverse Battery
(Incoming call to FXS+)
Ground Start 0 0 0 0 No Ringing
Loop Open 1 1/0 0 0 Tip Ground & Ringing
Loop Open 0 1/0 0 0 Tip Ground & No
Ringing
Loop Closed 0 1/0 1 0 Tip Ground & No
Ringing
Signal Means
0 logic 0 is the DS-1 stream
1 logic 1 is the DS-1 stream
1/0 logic 1 followed by logic 0 in each
successive signalling frame
X value is not significant
Loop Open phone on-hook
Loop Closed phone off-hook