AT&T Definity Callmaster II User And Installation Instructions Manual page 18

DCP Line Interface
The DCP line interface is a standard D8W 8-wire modular cord. One pair
is used for balanced digital transmission to the PBX switch; another pair
is used for balanced digital reception from the PBX switch. A third pair in
the 8-wire modular cord provides auxiliary power for the adjunct, and a
fourth pair is used only by the CALLMASTER II with Recorder Interface
to provide the analog Record Out signals to an external tape recorder.
The 8 line-jack pins are numbered in increasing order from left to right
when facing the jack with the tab slot down. The table below shows pin
assignments for the line cord and jack block interface.
CONNECTOR BLOCK
Conn. Block
Pin Number
3
4
5
1
2
6
7
8
* U-T = ''Tip''
U-R = ''Ring''
D Inside
Wire Color Pin
W-O
O-W
W-G
W-BL
BL-W
G-W
W-BR
BR-W
DCP JACK INTERFACE
Name
1 OD1
2 OD2
3 ID1
4 REC1
U-T*
5 REC2
U-R*
6 ID2
7 P1-
8 P2+
12
Signal
Description
Balance output from
telephone (power –48V)
Balance output from
telephone (power –48V)
Balance input from
PBX (power 0V)
Record output from
a CM II with Recorder Interface
On a CM III w/o Rec. Interface)
Record output from
a CM II with Recorder Interface
On a CM III w/o Rec. Interface)
Balance input from
PBX (power 0V)
Adjunct power –48V
(to adjunct jack)
Adjunct power common
(to adjunct jack)