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:
Jan. 11, 1977
Filed:
Dec. 22, 1975
Xavier N Barbier, Plessis Trevise, FR;
Societe Anonyme de Telecommunications, Paris, FR;
Abstract
Time multiplexed data transmission system in which P.C.M. data words (bytes) derived from speech signals of telephone component channels (telephone inputs) and P.C.M. signalling words derived from the signalling state of said telephone component channels (inputs) are respectively time multiplexed in data time slots and signalling time slots of a frame to form a composite multiplex channel or frame. The signalling time slots of successive frames form a multiframe format. In the intermediate stations inserted along the transmission path over which the resultant multiplex frame is transmitted, the input channel data and signalling states can be extracted or inserted. Each intermediate station comprises a device reconstituting (regenerating) the incident frame and a local frame time base, self driven and synchronized by the incident frame reconstituting device. The contents of incomng data time slots and signalling time slots are stored in a frame memory. Writing in this frame memory is controlled by the incident frame reconstituting device and reading out from the frame memory is controlled by the local frame time base, which also selectively controls the extraction or maintaining of the component inputs data from or in the resultant multiplex frame. The local frame time base directs the signalling words to a multiframe memory and a local multiframe time base driven by the local frame time base selectively controls the extraction or maintaining of the signalling words from or in the resultant multiplex frame.