Multiparty telephone ringing

Details Multiparty telephone ringing Multiparty telephone ringing

1976-02-19

1977-09-13

Claffy, Kathleen H.

179 84SS, 179 25R, H04M 302

Patent

active

040484483

ABSTRACT:
A subscriber loop carrier system using digital multiplex techniques is disclosed in which remote subscriber loops include multiparty lines. Four party fully selective ringing signals are detected at the central office terminal of the system and converted to cyclic codes which are detected at the remote terminal with simple asynchronous circuits. The code generation and detection circuits are implemented with multiple output inverter circuits which provide simple logic structures for integrated circuit realization. Standard polarized ringing signals are applied to either conductor at the remote terminal of the system to ring the proper party.

REFERENCES:
patent: 3118019 (1964-01-01), Feder et al.
patent: 3211839 (1965-10-01), Adelaar et al.
patent: 3223787 (1965-12-01), Jorgensen
patent: 3391253 (1968-07-01), Grandmaison
patent: 3649778 (1972-03-01), Suntop et al.
patent: 3689705 (1972-09-01), Pinede et al.
patent: 3898387 (1975-08-01), Fort
patent: 3899754 (1975-08-01), Brolin

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