Telephone systems

Details Telephone systems Telephone systems

H - Electricity

04

M

379/33

H04M 3/42 (2006.01) H04M 9/00 (2006.01)

Patent

CA 1154182

ABSTRACT An electronic key telephone system in which three or more key telephone instruments are interconnected or connected to an exchange line, as required, by way of a central control unit, each instrument being connected to the central unit by means of two speech wires and two signaling and control wires, wherein an adaptor unit ia. provided to enable connection of an external extension telephone to the central unit by way of a single pair of wires.

351204

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