The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 1977
Filed:
Feb. 19, 1976
Ronald Jay Canniff, Mount Arlington, NJ (US);
Mark Thomas Manfred, Rockaway, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
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.