Alcatel

Compagnie Industrielle Des Telecommunications Cit-alcatel

Alcatel Cit

Societe Dite Alcatel N.v.

Jean Adrien Guezou

Jean Lassaux

Bernard Paris

Jean-Pierre Martin

Christian Roche

Serge Le Goic

Marcel Ollivier

Bernard LeDieu

A system for interchanging data between 'agent' data processor units including processing means such as processors. Units are interconnected by an external multiwire interchange bus common to said units, with sharing the bus being orchestrated by an arbitrator. Each unit has storage means in which data is stored in an organized manner at determined addresses enabling the data to be read and/or written on demand. The whole formed by said units includes data storage means constituting a distributed interchange memory assembly common to all of the units and accessible by all of them via the interchange bus. Each unit contains a portion of the means of the assembly, constituted by an interchange memory which is accessible by the processor means of the unit, and by the processor means of another unit via the interchange bus.

System for interchanging data between data processor units having

A device for connecting a station to a local area network comprising at least one ring includes switching arrangements associated with circuits for regenerating a signal in order to bypass a station when it is out of service and compensate the attenuation and phase jitter caused by the upstream ring segment. This device enables any number of stations to be taken out of service without seriously degrading operation of a ring. The device is usable in local area networks comprising one or more high-speed (125 Mbauds) rings.

Device for connecting a station to a local area network comprising at

The interchange system comprises stations connected to a loop link having two rings (A1, A2) making use of a token access method and operating in load sharing mode, with each ring providing all interchanges in the event of the other ring breaking down. Each station has one adapter (1, 2) per ring, a coupler (C), and a terminal (T). Each adapter performs level 1 procedures and lower layer level 2 procedures only. The coupler includes a processor and uses a protocol at the upper layer of level 2 and at level 3 for managing load sharing between the rings, for switching the station onto one ring in the event of the other ring breaking down, and for providing protection against transmisson errors, against messages being duplicated, and against messages being out of sequence, against breakdowns in the adapters and the rings, and against short traffic interruptions due to a station being inserted or withdrawn.

System for interchanging messages in real time between stations

A control logic system comprising at least one sub-system including a master processor, two slave processors and an interchange memory which exchanges information between the master processor and the slave processors. The slave processors access a common memory via an interprocessor interface.

Logic system for controlling a modular multiplex connection unit in a

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Lannion, France

Jean Adrien Guezou