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:
Aug. 15, 1989
Filed:
May. 20, 1988
Felix V Diaz, Plano, TX (US);
Jack H Stanley, Plano, TX (US);
DSC Communications Corporation, Plano, TX (US);
Abstract
A switching system (10) configured in a ring topology (14) is disclosed. The system (10) causes one or more 125 microsecond isochronous frames (20) to circulate in the ring (14) at any given instant in time. A delay circuit (22) temporarily saves an oldest one of the isochronous frames (20) until a youngest one of the isochronous frames (20) has completed its transmission. Consequently, an integral number of isochronous frames (20) circulate in ring (14). The isochronous frame (20) is partitioned to support a random access tunnel channel (26) and a plurality of independently controlled cells (28), which provide a variety of deterministic access services. Each cell (28) contains a control field (30) that contains sufficient information to specify the type of switching service provided by the cell (28) and various service parameters. A time multiplexer (42) separates the tunnel channel (26) from the cells (28). A cell handler (46) separates individual ones of the cells (28) into individual service-specified channels. Other physical layer sections (44, 48-54) adapt these channels to a media access control layer's (56) requirements.