CALLMASTER®
IV Voice Terminal User and Installation Instructions
vii
ADDITIONAL 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, 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-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.
WHEN THIS PRODUCT IS LOCATED IN A SEPARATE BUILDING from the
telephone communications system, a line current protector MUST be installed at
the entry/exit points of ALL buildings through which the line passes. However, note
that there is a difference between 4-wire and
2-wire installations.
The following are the ONLY acceptable devices for use in a 4-wire installation:
(Note that two protectors are needed at each installation point.)
■ Lucent Technologies 4-type protectors
■ ITW LINX LP-type protectors
For 2-wire installations, the following is recommended: (Only one protector is
needed at each installation point.)
■ Lucent Technologies 4-type protectors
■ ITW LINX LP-type protectors
However, if the above two protectors are not used, the following is acceptable in a
2-wire installation:
■ Lucent Technologies 3BIC (Carbon block) or Lucent 3BEW (gas tube)
protectors
NOTE: The 3BIC and 3BEW protectors can be used ONLY for 2-wire installations.
They CANNOT be used for 4-wire installations.
