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INSTALLATION LBI-39076
B
21
2
3
4
5
6
7
A
B
C
D
JP3
A
B
C
D
JP2
RING
DET.
100 OHMS
JP6
4.7 OHMS
4.7 OHMS
4.7 OHMS
4.7 OHMS
JP5
8
620 OHMS
FUSE F3 GND
JP4
FUSE F2 -48 V1
620 OHMS
DS1
DS2
JP11
JP10
K3
A
C
B
A
B
JP12
E-LEAD
DET.
JP8
JP1
A
B
JP9
K2
LOOP
CURRENT
DET.
JP13
AB
T2
AUDIO
HYBRID
JP14
JP15
AUDIO
SEND
REC.
AUDIO
10
.47
RJ-45
J1
OR
REC.
2-WIRE
4-WIRE
SEND/REC.
SEND
4-WIRE
A
B
C
D
E
F
M
A
B
C
D
M
M-LEAD
E-LEAD
EXTERNAL
REFERENCE
E-LEAD
M-LEAD RELAY
DE-ENERGIZED for IDLE (shown)
ENERGIZED for BUSY
JP7
EXTERNAL
M-LEAD
REFERENCE
AB
T1
AB
CKT.
BAL.
Figure 23 - Telephone Interface Circuit (Rev A Main Board)