The 8400-Series Voice Terminals Instructions for Installation, Switch,
Administration, and Programming the Options
555-015-725
Issue 1
October 1996
Installing Your Voice Terminal
Page 3-3
Wiring Information
3
INSTALLATION WARNING
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN CAUSE DAMAGE TO
THE TERMINAL OR CAUSE THE ASSOCIATED PBX CIRCUIT PACK TO
REMOVE POWER TO THE TERMINAL. IN EITHER CASE THE TERMINAL
WILL NOT FUNCTION CORRECTLY.
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, see Table 3-1 (“Line Interface”)
to insure that the wires from the 4-pin or 6-pin wall jack are connected to the
correct pins on the terminal “LINE” jack.
4-WIRE installations MUST ONLY have PBX connections on pair 2 and pair 3 and,
if necessary, auxiliary power must be connected to pair 4.
2-WIRE installations MUST ONLY have PBX connections on pair 1 and, if
necessary, auxiliary power must be connected to pair 4.
All of this information applies to all 8400 series voice terminals, the
CALLMASTER III, and the 302B1 and 302C1 Attendant Console.
