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:
Feb. 09, 1993
Filed:
Mar. 12, 1990
Mehdi M Nassehi, Adliswil, CH;
Erwin A Zurfluh, Feldmeilen, CH;
International Business Machines Corporation, Armonk, NY (US);
Abstract
In a communications network comprising two counterflowing busses (folded bus or dual bus) and a number of stations (N1, N2, N3) connected between them, a cyclic reservation and access technique is provided. A headend unit generates consecutive time slots for data transmission which are grouped in cycles. For each cycle, the headend first issues a reservation command (RES) with a cycle number and a reservation count which each station augments by the slot count required locally. Each station stores the cycle number with the requested slot count. The headend stores in a global reservation queue, for each returning reservation command, the cycle number and the accumulated reservation count. Later it issues a start command (ST) with the respective cycle number, and subsequently generates the required number of slots as indicated by the stored accumulated reservation count. The headend can issue additional confirm commands and reject commands for activating a backpressure mechanism.