Key telephone system signalling and control arrangement

Details Key telephone system signalling and control arrangement Key telephone system signalling and control arrangement

1983-04-21

1985-04-16

Schreyer, Stafford D.

179 99M, 179 99P, 179 18AD, H04M 172

Patent

active

045117667

ABSTRACT:
A key telephone system having a plurality of station sets for connection to first or second telephone lines. The system includes a common control line for transmitting and receiving control signals at each of the station sets. In response to such a control signal, the handsets of at least two of the station sets are connected to the common control line to establish an intercom connection between them. Each of the station sets also includes a transistor load network having a load impedance which is substantially equal to that of the handset. Each network is normally connected across the control line except when the associated handset is connected to that line so that the overall load on it remains substantially constant. This eliminates transients which may cause received errors in the control signals.

REFERENCES:
patent: 3549820 (1970-12-01), Knollman
patent: 3647980 (1972-03-01), Fabiano, Jr. et al.
patent: 4160131 (1979-07-01), Kaul et al.
patent: 4234765 (1980-11-01), Sekiguchi et al.

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