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OVERVIEW
TERMINATING
EQUIPMENT
IDLE
-12 TO
-48 V
BUSY
N.C.
N.C.
FIGURE C-1. M-LEAD SIGNALING INTERFACE,
APPENDIX C
M-LEAD SIGNALING INTERFACES
Figures C-1 through C-7 represent M-lead signaling interface diagrams
for GDC voice channel card types to external equipment.
TYPE-I SIGNALING
A
VOICE
CHANNEL
M
GND
SG
8
B
BATT
M
M
3
C
PTC
- BATT
GND
BATT
2
SB
15
NOTE: X2, X6 AND X10 ON EAM-1 PIGGYBACK
BOARD IN U.S. POSITION.
X4 AND X9 ON UNIVERSAL VOICE CARD IN U.S.
POSITION.
TYPE-I SIGNALING
+
M-LEAD
SENSOR
(ISOLATED)
—
INT
-12 V
A
X1 ON CELP MODULE
X1 ON VOICE II/ASP CHANNEL MODULE AND UNIVERSAL
INT
VOICE CARD
X1 ON VLBRV CHANNEL MODULE
X4 ON UNIVERSAL VOICE II/CVSD CHANNEL MODULE
X4 ON VOICE II/PCM & ADPCM CHANNEL MODULES
D
X2 ON CELP MODULE
B
X2 ON VOICE II/ASP CHANNEL MODULE AND UNIVERSAL
VOICE CARD
X2 ON VLBRV CHANNEL MODULE
X5 ON VOICE II/CVSD CHANNEL MODULE
X3 ON VOICE II/PCM & ADPCM CHANNEL MODULES
C
X3 ON CELP MODULE
X3 ON VOICE II/ASP CHANNEL MODULE AND UNIVERSAL
VOICE CARD
X3 ON VLBRV CHANNEL MODULE
X6 ON VOICE II/CVSD CHANNEL MODULE
X5 ON VOICE II/PCM & ADPCM CHANNEL MODULES
M-LEAD
OUT
C-1
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