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. 20, 2007
Filed:
Dec. 26, 2000
Thomas a Hoch, Boxborough, MA (US);
John Patrick Jones, Westford, MA (US);
Andrew a Long, Northborough, MA (US);
Prasasth R Palnati, Westford, MA (US);
Ronald M Parker, Boxborough, MA (US);
Raymond J Schmidt, Stoughton, MA (US);
Thomas A Hoch, Boxborough, MA (US);
John Patrick Jones, Westford, MA (US);
Andrew A Long, Northborough, MA (US);
Prasasth R Palnati, Westford, MA (US);
Ronald M Parker, Boxborough, MA (US);
Raymond J Schmidt, Stoughton, MA (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A methodology is provided for fault detection and service restoration in a multiservice switch on a per flow basis. An ingress source transmits the same data over each of two redundant cores. An egress receiver selects on a per flow bass which core to utilize. Bi-directional flows are not necessarily grouped together. The basic approach to fault detection is to assume that the two cores are not in lock step, but that the shelves are continually monitoring link flows for control path data as well as user data. The path monitoring is accomplished using a combination of arbiter and aggregator functions found in the service shelves and core interface cards, respectively. The arbiter transmits link test cells to both cores on a per flow basis, wherein the link test cells traverse and are monitored by respective aggregators to and from each core. When an egress arbiter determines that a flow is bad, it initiates a switch to the alternative source core, from which the flow would continue.