Loop sharing in digital systems

Details Loop sharing in digital systems Loop sharing in digital systems

1980-07-15

1983-01-11

Brigance, Gerald L.

179 251, H04Q 502

Patent

active

043683584

ABSTRACT:
The invention relates to a digital loop sharing telephone system and also to a digital telephone for connection into such a system. The loop may be for a parallel telephone system or a party-line system. Each telephone is adapted to transmit data in an upstream direction on the loop, that is towards an exchange of the system, which data may originate from the telephone itself or a further telephone downstream thereof. Each telephone includes code detector circuitry and logic circuitry whereby if the telephone is the first to change to an off-hook or active condition it "seizes" the loop for exclusive data transmission to the exchange. In the case of a parallel telephone system any telephone going off-hook can receive incoming data from the exchange but only the first telephone to go off-hook can send data. In the case of a party-line system only the telephone which seizes the loop can receive data.

REFERENCES:
patent: 2994742 (1961-08-01), Lomax
patent: 3155776 (1964-11-01), Kano et al.
patent: 3284575 (1966-11-01), Howard
patent: 3626100 (1971-12-01), McNeilly et al.
patent: 3680053 (1972-07-01), Cotton et al.
patent: 3691308 (1972-09-01), Angner et al.
patent: 4224478 (1980-09-01), Fahey et al.

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