Multi-party telephone system allowing speech connection between

Details Multi-party telephone system allowing speech connection between Multi-party telephone system allowing speech connection between

1977-08-17

1979-11-13

Brown, Thomas W.

179 18J, H04Q 130

Patent

active

041744667

ABSTRACT:
A multy-party telephone system for the connection of telephone sets by a small number of wires has arrangements for achieving the exchange of information by digital signalling between the telephone sets and a control unit included in a exchange unit of the system. The system includes a number of telephone sets each connected through a 6-wire line to a exchange unit common for all the telephones. Four of the wires in the 6-wire line constitute two signalling channels, one channel for each direction between the telephone and the exchange unit. The remaining two wires in the 6-wire line are used as speech wires. Each of the telephone sets includes a code sender for signalling with digital code words to the exchange unit, a code receiver for receiving digital signalling code words from the exchange unit, a tone ringer for producing audio signals when receiving a call, lamp indicators for indicating the system status and a push button set for initiating those functions which can be carried out by the telephone set. The exchange unit includes a code receiver common for all telephone sets for receiving the code words sent from each of the telephone sets, a code sender common for all telephone sets for transmitting calculated code words to the telephone sets, a control unit for common signal processing and for setting up the speech paths of the telephone sets through a switch, and a signal converter for the conversion of signals from the system to an external line and vice versa.

REFERENCES:
patent: 3701854 (1972-10-01), Anderson et al.
patent: 3843845 (1974-10-01), Ridley
patent: 3935396 (1976-01-01), Barsellotti et al.
patent: 3941936 (1976-03-01), Graham et al.
patent: 3997738 (1976-12-01), Korsky et al.

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