GEC No. 5700 Type
PRIVATE AUTOMATIC EXCHANGES
P.A.X. No. 5700 may be supplied initially for less than the total number of lines the unit is capable of serving, and extensions may be made beyond this total by adding further 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.
Construction of the unit is very similar to that of
P.A.X. No. 5300 type.
The A5700 series of P.A.X. units is similar to the 5700
series except that provision is made for a faulty line to be connected
automatically to a high resistance relay, the operation of which
prevents the seizure of a connecting link.
D.C. Mains supply up to 250 volts:-
Taken from the GEC Private Automatic Telephone Exchanges No. 18/3A (undated)
Last revised: August 20, 2012