Chipcom Corporation

3Com Corporation

Ilan Carmi

Yuval Shohet

Brian Ramelson

Yoseph Linde

David E Bartolini

Gordon C Saussy

John L Cook, Iii

Menachem Abraham

Samuel Ben-Meir

Steven E Horowitz

Alex Herman

Ira Hart

Richard Rehberg

Igor Zhovnirovski

Yongbum Kim

A local net area network, or LAN, configuration is provided with a multiple generic LAN channel architecture which can be logically and dynamically changed. The configuration control can be applied to each module of the network and to each port of a module of a LAN hub. The architecture provides multiple LAN protocols to be used simultaneously, as needed, through protocol specific functions. Industry standard protocol such as: token bus, token ring, and fiber distributed data interface (FDDI), can be implemented using the generic channel architecture and its characteristics providing respective network functions. The architecture also provides a digital collision detection method and provides information necessary for precise network statistics monitoring. The token passing ring architecture provides a logical ring formation within the generic channel. A token passing bus architecture uses modified Ethernet.TM. architecture, and a hub management provides control for the generic multichannel and the LAN management provides protocol dependent network management. The architecture provided allows multiple hub management entities via hub mastership arbitration to provide a unique master for the hub management function.

Generic backplane system which is configurable to serve different

A method and apparatus for providing secure communication on open networks. Each port of the network is provided with a security entity which monitors the communication between one port to the other. End stations connected to the ports communicate with other end stations by transmitting data to the port and receiving data from the port. The data is sent out in data packets with a destination address and a source address. Each port has its own unique address. The security entity checks data packets coming into the port for a destination address. The destination address of incoming data packets is compared with the port address of the affiliated port. Also, outgoing data packets from an end station to a port are also monitored by the security entity. The security entity compares the destination and source address of the data packet with the affiliated port address. The security entity cyphers and decyphers a data portion of the data packet depending on whether or not the source address, destination address and port address match. In this way, end stations not destined to read the data portions are thus prevented from doing so. Also end stations which are not authorized to transmit onto the network are prevented from having any users on the network understand their data.

Security system for a network concentrator

Communication system concentrator configurable to different access

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Framingham, MA, United States of America

Ilan Carmi