Terminal interface connecting terminal unit having central...

Details Terminal interface connecting terminal unit having central... Terminal interface connecting terminal unit having central...

H - Electricity

04

M

379/12

H04M 3/02 (2006.01) H04M 9/00 (2006.01)

Patent

CA 1211239

ABSTRACT OF THE DISCLOSURE A terminal interface device comprises in-service detector connected to a plurality of CO lines leading to a main unit in a key telephone system and also connected to a terminal unit having a CO line interface, for detecting the in-service state of the respective lines, that is, whether the CO line is currently being used by the terminal unit and for sending an in-service signal indicative of the detected in-service state to the main unit of the system, and a switch controllably operated by a switching control signal generated from the main unit on the basis of the in-service signal and a signal indicative of the state of the CO lines in the main unit to connect one of the plural lines to the terminal unit.

454601

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