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. 28, 2012
Filed:
Jun. 21, 2004
Rolf Clauberg, Gattikon, CH;
Rolf Clauberg, Gattikon, CH;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A Resilient Packet Ring (RPR) add/drop device (') supporting plug & play redundancy to connect at least one ring (-), e.g. SDH/SONET ring, to a switch or router device is disclosed. The add/drop device according to the invention comprises two systems (-and-), e.g. Printed Circuit Boards (PCBs). If a failure happens in one of these systems or in a fiber, the whole RPR node comprising these two systems is not affected and the failing system may be changed without perturbation. Each system comprises a framer device and an Add/Drop Multiplexor-Media Access Control (ADM-MAC) device (). In a preferred embodiment, the framer device is a multiplexing framer device that combines at least two RPR data signals having an input data rate into a single data stream having an output data rate being higher than the input data rate for transmission on a shared medium or vice versa. The ADM-MAC device interfaces the multiplexing framer device, the switch or router device and the ADM-MAC device of the other element to provide plug & play redundancy.