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ADJUNCT POWER
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 equip-
ment 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.
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