Key telephone apparatus

Details Key telephone apparatus Key telephone apparatus

H - Electricity

04

M

H04M 1/00 (2006.01) H04M 1/72 (2006.01) H04M 9/00 (2006.01)

Patent

CA 2049005

The present invention relates to a key telephone apparatus. In accordance with the present invention, a port for connecting terminal devices comprises two pairs having four wires, one pair having two wires of which is connected to a digital terminal device and the other pair having two wires of which is simultaneously connected to an analog terminal device, and there is provided switching control means for auto- matically selecting either of an interface circuit for analog terminal device and an interface circuit for digital terminal device connected to this port in accordance with the state of use of terminal devices. Therefore, it is possible to connect a one-pair two-wire analog terminal device and a one-pair two-wire digital terminal device together to one port and select either the interface circuit for analog terminal device or the interface circuit for digital terminal device according to the state of use of terminal devices under surveil- lance of the switching control means. As a result, the analog terminal device and the digital terminal device can be handled as one terminal device (extension).

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