PRIVATE AUTOMATIC TELEPHONE EXCHANGES
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.
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.
Last revised: November 29, 2021