Juniper Networks, Inc.

Silicon Graphics, Incorporated

Compaq Computer Corporation, Inc.

Unmesh Agarwala

David P Chengson

Michael Beesley

Ali Mira

Lawrence Hui

Edward C Priest

John C Manton

Alan D Foster

Scott Chew

Anis Haq

William L Schmidt

Scott Sarnikowski

Frank G Moore

Charles E Comstock

Stanley S Quan

A router includes multiple routing engines. If the active routing engine fails, a backup one of the routing engines detects the failure and assumes the role of active routing engine. A redundancy controller circuit, connected to the multiple routing engines, facilitates the selection and switching of the routing engines. Portions of the packet forwarding engine, in addition to the routing engine, may be redundantly implemented. The active routing engine controls the selection of the redundant portion of the packet forwarding engine.

High capacity router having redundant components

In a data processing system of the type having multiple processor units coupled to one another by a bus means for interprocessor communications there is provided a fiber optic interconnection system to interconnect the bus means of multiple processor sections to one another, thereby allowing groups of the processor units to be physically spaced from one another. The fiber optic interconnect system includes, for each multiprocessor unit section functions to receive messages communicated on the interprocessor bus of that section for receipt by a destination processor of the other section, format the message for fiber optic transmission, and transmit the message; and circuitry for receiving messages on the fiber optic link, scheduling the message for transmission to the destination processor, and maintaining that scheduling in the face of receipt of another message for the same processor unit. The fiber optic interconnect system includes means for configuring the system to identify which processor units are in which section and, when more than two sections are interconnected by the fiber optic link, provide information as to the shortest route to the destination processor from a section.

Multiprocessor system with fiber optic bus interconnect for interprocessor communications

A processor-inclusive memory module (PIMM) is disclosed. In one embodiment of the present invention, the PIMM includes a printed circuit board having first and second opposing surfaces. The printed circuit board also has an address line formed therein. A first SRAM is mounted on the first surface of the printed circuit board. The present PIMM is further comprised of a second SRAM mounted on the second surface of the printed circuit board. The second SRAM is mounted on the second surface of the printed circuit board directly opposite the first SRAM mounted on the first surface of the printed circuit board. The first and second SRAMs are coupled to the address line by respective cache buses. A processor is also mounted on the first surface of the printed circuit board, and is coupled to the address line. In one embodiment of the invention, a heat sink is thermally coupled to the processor. The processor has a plurality of contact pads disposed thereon. Electrical connectors extend from the second surface of the printed circuit board. The electrical connectors are electrically coupled to respective contact pads of the processor. In the present PIMM, the electrical connectors are adapted to be removably attached to a mother board. In so doing, the present PIMM is removably attachable to a mother board.

Processor-inclusive memory module

Growing community of inventors

San Jose, CA, United States of America

Unmesh Agarwala