The Private Automatic Branch Exchange type 1 + 4/1 has been designed for small factories, offices, clubs, large residences, etc., where the small number of telephones in use does not justify the installation of a private branch exchange and the expense of a switchboard operator.
This PABX provides fully automatic telephone service for all internal calls and also calls to and from the public exchange which may be
CB, manual or automatic, Incoming calls from the public exchange operate a common calling bell. A telephone selected for the purpose of answering is called
an attendant extension. Calls are answered from the attendant extension by lif1~ing the handset and pressing the button. An exchange call (incoming or outgoing) is transferred from an attendant extension to another internal extension by pressing the button and dialling the required number.
Instruments used with this PABX may be wall or desk automatic telephones with push button.
The PABX is housed in a metal box with the following dimensions:-
Height - 38 cm (15 in.)
Width - 24 cm (9,5 in.)
Depth - 23 cm (9 in.)
Weight (approx.) - 16.5 Kg (36.5lb)
The rear framework is fastened to the wall with Rawlbolts or coach screws and battens, at a suitable height for working on the equipment.
The normal working voltage or the PABX is 24 volts, d.c. No batteries are required as the standard equipment is arranged to take current from a battery eliminator operated directly from alternating current supply. The typical characteristics of the eliminator are as follows:
Input: 110 or 220V a.c. 50 Hz single phase
Output: 24V d.c. 1 Amp.
To install a PABX type 1 + 4/1 the following, equipment and material are required:
Taken from sales literature 300/1 by Plessey Automatica Electrica
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