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PRIVATE AUTOMATIC TELEPHONE EXCHANGES
P.A.X.
PX3300
SERIES
CAPACITY 50 LINES
The apparatus is mounted on a steel frame which is enclosed in a floor-pattern cabinet of polished hardwood. The glass-panelled front is hinged and provided with a lock. A lift-out panel at the rear gives access to wiring. Each telephone is connected to the unit by means of a twin conductor, suitable instruments being the ST1500, ST1600, ST2500, ST2600, ST3500 and ST3600 ranges. Alternatively, use can be made of the loud-speaking telephone MT3101 and MT 3102.
Power Plant
D.C. Mains supply up to 250 volts: two suitable 50-volt batteries are provided,
together with a control panel fitted with the necessary instruments, switches
and fuses to enable one battery to be charged through a resistance while the
other is supplying the exchange.
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Last revised: November 29, 2021FM2 | |||||||||||||||||||||||||||||||||||||||
GEC
The
PX3300 series has been designed to give maximum flexibility. The units are of
the extensible type, which can be initially equipped for any required number and
can later be extended, as desired, simply by the addition of further equipment
or units. For example, a 100-line exchange is formed by installing two units
operating in conjunction with each other. For extensions above 100 lines, group
selector equipment is provided in addition to the line units.