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:
Mar. 11, 2003
Filed:
Jun. 30, 1998
Suminori Yoshikawa, Tokyo, JP;
Kazuhiro Ushiyama, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A back-pressure type ATM switch wherein a variety of high-quality and flexible services can be served with high hardware/software efficiency. A resource manager provided to each input buffer, performs rejection control of cells according to RTQL (Rejection Threshold Queue Length) of each of s×n input queues, RTQL of each of s QoS-class virtual resources and a minimum guaranteed resource of each of the s×n input queues referring to RTQL of a common resource. A shaper accompanying each of the s×n input buffers shifts cells into a virtual queue at a speed obtained by (minimum guaranteed speed)+(rate information)×(active VC number of the input queue). A rate controller calculates the rate information as a function of the sum of the virtual queue of each of the s×n input queues of every of the input buffers. A back-pressure connector provided to the input queue read controller of each input buffer defines correspondence between back-pressures generated by output buffers and back-pressures referred to by the input queue read controller.