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DEFINITYEnterpriseCommunicationsServerandSystem75andSystem85
Terminals and Adjuncts Reference
555-015-201
Issue 11
December 1999
Adjunct Power
4-5Information on the Older Power Supplies
4
One of these power supplies must be used for each voice terminal equipped with
one or more adjuncts. Each of these power supplies (except the 95B1) has a
maximum cable distance of 250 feet (76 m) between the power supply and the
adjunct(s). The maximum cable distance for the 95B1 is 150 feet (45m). Voice
terminal adjuncts and modules are not operational during interruptions of
commercial AC power unless their power supplies are also powered through
standby power of other essential AC power service.
The 329A and 346A power supplies clustered in a satellite closet are normally
mounted on AC power strips. Power to these strips is provided from a dedicated
120 volt AC, 60-Hz, 20-ampere circuit breaker and feeder either directly or
through a 543A telephone power unit. The 543A unit provides an inductive filter to
limit inrush current on the feeder. It comes equipped with an AC power cord which
plugs into the dedicated feeder and provides four receptacles for AC power strips.
The 945 bulk power system is usually rack mounted and is intended to be located
in an equipment room or satellite closet. It is optionally made up of the following
components:
■ 945-1 bulk power supply unit.
■ 945-2 battery reserve unit.
■ 945-3 system enclosure, equipped with one or two 945-1 and/or a 945-2.
■ 945-4 single enclosure for 945-1 unit.
Several power supplies and connection schemes are available for providing
auxiliary adjunct power when it is required. Regardless of its source, auxiliary
power is introduced into a pair of spare leads in the individual voice terminal’s line,
at some wiring interface. The auxiliary power is fed into the terminal on the
mounting line cord. From the terminal, power is distributed to the adjunct(s). An
auxiliary power source is usually mounted in a satellite closet or adjacent to the
voice terminal’s wall jack.
The MSP-1 Power Supply
The MSP-1 (WP92464L1) Power Supply can be used to supply local power to
ISDN-T 65xx, 75xx, and 85xx series voice terminals connected to a DEFINITY
Communications System G1, G2, and G3, a DEFINITY ECS, and to the DCP
7444 and 8434/8434DX voice terminals which need auxiliary power for their
vacuum fluorescent displays. The MSP-1 can also supply auxiliary power to
adjunct equipment such as the S201A and CS201A speakerphones or a 500A
Headset Adapter attached to any currently manufactured analog, DCP, or ISDN-T
voice terminal equipped with an Adjunct jack.
!
CAUTION:
The MSP-1 Power Supply can be used only with telecommunications
equipment, indoors, in a controlled environment.