Specifications

The CALLMASTER, CALLMASTER II, CALLMASTER
III, CALLMASTER IV, CALLMASTER V, and
CALLMASTER VI Voice Terminals
Issue 11 December 1999
13-15
* U-T = “Tip”
U-R = “Ring”
The design of this product allows it to operate on either 2-wire or 4-wire DCP circuits. In
order for the terminal to function properly in either 2-wire or 4-wire installations, there
must be NO INTERCONNECTIONS between the wire pairs used for 2-wire and 4-wire
operation. Bridging or paralleling of these pairs can result in damage to the terminal or
can cause the PBX circuit pack to remove power to the terminal.
REMOVE ALL CONNECTIONS BETWEEN PAIRS BEFORE CONNECTING THE
TERMINAL.
For 2-wire operation, if you need to plug the voice terminal into a 4-pin or 6-pin wall jack,
instead of a standard 8-pin modular jack, refer to the “Modular Wall Jack Wiring” table on
the next page to insure that the wires from the 4-pin or 6-pin wall jack are connected to
the correct pins on the terminal 2-wire “LINE” jack.
4 O-W 2 OD2 Balance output from
telephone (power –48V)
4-wire application
REC-2 Output to Recorder
2-wire application
5 W-G 3 ID1 Balance input from PBX
(power –48V)
4-wire application
2-wire — unused
1 W-BL 4 REC-1 Output to Recorder
4-wire application
U-T* Balanced output from
telephone (power –48V)
2-wire application
2 BL-W 5 REC-2 Output to Recorder
4-wire application
U-R* Balanced output from PBX
(power 0v)
2-wire application
6 G-W 6 ID2 Balanced input from PBX
(power 0v)
4-wire application
2-wire — unused
7W-BR7P1– Adjunct power –48V
(to Adjunct jack)
8 BR-W 8 P2+ Adjunct power common
(to Adjunct jack)
Table 13-1. The DCP Line Interface for the CALLMASTER IV
CONNECTOR BLOCK DCP JACK INTERFACE