Local area data communication network

Details Local area data communication network Local area data communication network

1984-04-23

1986-07-22

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, H04J 302, H04Q 1104

Patent

active

046023640

ABSTRACT:
A data communication network over which data handling devices can transmit and receive packets among themselves having a bus, a number of subnetworks (each having interfaces for connecting a number of devices to each subnetwork), a concentrator for connecting each interface to the bus, each concentrator having a transceiver for transmitting, to the bus and to devices connected to each subnetwork, packets originating from devices within a subnetwork (transmitted packets), and for receiving from the bus packets originating from other subnetworks (received packets), collision avoidance circuitry for monitoring transmission attempts by devices connected to the subnetwork, for detecting competing transmission attempts that would create a collision on the subnetwork, and, upon such detection, permitting a selected attempt to enter the subnetwork, while preventing other attempts from entering it, collision detection circuitry for monitoring the bus and preventing all attempted transmissions from entering the bus whenever a packet from another subnetwork is present on the bus. In another aspect the interface means and the concentrator means include a network interface unit and a further interface unit.

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Wood, "Systems View of Token-Ring Local Area Networks, TI-MIX Symposium: Communicating and Networking," Apr. 5-8, 1983.

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