Terminal interface connecting terminal unit having central offic

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

1984-05-23

1986-01-14

Dwyer, James L.

179 99M, 179 99R, H04M 358

Patent

active

045647240

ABSTRACT:
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.

REFERENCES:
patent: 4028499 (1977-06-01), Houagimyan et al.
patent: 4381427 (1983-04-01), Cheal et al.

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