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PRIVATE AUTOMATIC TELEPHONE EXCHANGES
P.A.X.
PX3100
SERIES
CAPACITY 50 LINES
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. The unit is particularly designed for systems that will not exceed 50 lines; it cannot be extended beyond that total. If the need for such extension is anticipated, the unit shown overleaf should be installed. Power
Plant D.C.
Mains supply up to 250 volts: two suitable 26-volt batteries are used, together
with a charging 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 unit.
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Last revised: November 29, 2021FM2 | |||||||||||||||||||||||||||||||||||||||
GEC
The initial equipment of this unit can be for as few as 10 or 20 lines.
Extensions may be added, when desired, up to a total of 50 lines. The switching
equipment is enclosed in a cabinet of polished hardwood. The glass panelled
front of the cabinet is hinged and provided with a lock. A lift-out panel at the
rear gives easy access to the wiring. A ringing vibrator incorporated in the
unit converts battery current to A.C. for ringing bells in the instruments.