User manual

61200105L3-1A E&M+ Dual Voice Option Module User Manual C-1
Appendix C Signaling States
SIGNALING STATES
Table C-1 describes the signaling states for the E&M+ Dual Voice
option module and E&M+ plug-on board and the DS-1 PCM
stream.
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
Table C-1. E&M+ Signaling States
E-LEAD OUTPUT RXA RXB TXA TXB M-LEAD INPUT
X X 0 0 M-lead IDLE (0 V - Type I/II)
(-48 V - Type V)
X X 1 1 M-lead ACTIVE (-48 V - Type I/II)
(0 V - Type V)
E-lead IDLE (-48 V) 0 X X X
E-lead ACTIVE (0 V) 1 X X X