Data communication network having interface and concentrator

Details Data communication network having interface and concentrator Data communication network having interface and concentrator

H - Electricity

04

L

340/84

H04L 12/413 (2006.01)

Patent

CA 1226051

Network Abstract of the Invention 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, circuitry for generating a collision signal upon detecting competing transmission attempts, a network interface unit (NIU) associated with each device to cause withdrawal of an attempted transmission by that device upon receipt of a collision signal, a transmit channel over which transmitted packets are transmitted to the bus, a receive channel over which received packets are transmitted to devices connected to each subnetwork, a station interface unit (SIU) intermediate the NIU and concentrator, a first transmit connector over which transmitted packets pass from the NIU to the SIU, a receive connector over which received packets pass from the SIU to the NIU, a collision signal connector over which collision signals pass from the SIU to the NIU, a second transmit connector over which transmitted packets pass from the SIU to the transmit channel, a combined receive and collision signal connector over which collision signals pass from the concentrator to the SIU, and over which received packets pass from the receive channel to the SIU, and demultiplexing circuitry in the SIU for routing collision signals to the collision signal connector and received packets to the receive connector.

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