International Business Machines Corporation

Ferdinand Gramsamer

Cyriel Johan Minkenberg

Francois Abel

Ronald Pete Luijten

Mitch Gusat

Antonius Paulus Engbersen

Mark Verhappen

Wolfgang Emil Denzel

Hong Linh Truong

Michel Colmant

Jose Duato

Beat Liver

Peter Micheal Klett

The present invention discloses a memory sharing mechanism based on priority elevation. In accordance with the present invention, there is provided an apparatus and method for transporting packets of data in a communication device, wherein each packet is assigned one of several priorities and received based on memory state information. The method comprises the steps of storing the received packets in a memory and modifying the assigned priority of any of the packets causing congestion within the memory.

Memory sharing mechanism based on priority elevation

The present invention discloses a scalable flow-control mechanism. In accordance with the present invention, there is provided a switching device for transporting packets of data, the packets being received at the switching device based on flow-control information, the device comprising a memory for storing the packets, a credit counter coupled to the memory for counting a credit number of packets departing from the memory, and a scheduler unit coupled to the credit counter for deriving the flow-control information in response to the credit number. Moreover, a switching apparatus and a method for generating flow-control information is disclosed.

Scalable link-level flow-control for a switching device

The present invention relates to switching in electronic networks. Many data transmission protocols and technologies used in such networks, such as TCP/IP and Ethernet, use variable-length packets for transmission. Often however, the nodes that make up these networks typically contain high-speed cell switches that only support fixed-size data units. To support variable-length packets in such a fixed-size cell switch non-interleaving switching and transmission must be offered. The present invention provides such a solution in essence by segmenting a variable-length frame into a plurality of fixed-length cells including a start-of-frame cell, one or more continuation cell(s), and an end-of-frame cell and routes said fixed-length cells through said switch, thereby providing, at an output of said switch, subsequent and deadlock-free transmission of consecutive cells of a certain frame, and block any cell of a different frame from interleaving. This leads to better average delay characteristics and removes the need for packet reassembly.

Method and structure for variable-length frame support in a shared memory switch

The invention relates to a method and an arrangement for maintaining an organized and automated archiving and retrieval system including a personal bibliography of original documents or other original real objects as well as an electronic archive containing copies of such original real objects with guaranteed access. Essentially this is done by establishing a machine and/or human readable 'unique identifier' (UID) distributed with each original real object, a so-called personal archive allowing a person (or a group of persons) to maintain a personal bibliography, a managed storage containing electronic copies of the distributed original real objects, and means for a controlled, but guaranteed access to the stored electronic copies. The unique identifier UID will be established and controlled, usually by a service provider, and attached to each original (document) when it is distributed, usually by the publisher, so that it can be read by the user, preferably with a simple reader for entering it electronically into his personal archive. The personal archive may be maintained either by the person or by another (or the same) service provider, but is personalized in the sense that the user determines the contents of his/her archive. A controlled access system with access certificates, which may be time-limited, issued to the requesting user guarantees user access to the stored electrinic copies. Access control will again be provided as service, be it by the publisher or any of the service providers mentioned.

Archiving and retrieval method and apparatus

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Wettswil, Switzerland

Ferdinand Gramsamer