Siemens Aktiengesellschaft

Anton Sauer

Hans Thinschmidt

Hans H Witte

Frank Schmidtke

For the purpose of expanding the connection capacities of optical mixers in order to form a large network, series connections of such optical mixers are provided. In such networks, such series connections are formed of optical mixers which produce signal transmission paths which are identical to one another. No different signal transmission paths are present in the network overall.

Network comprising a multitude of optical signal transmission lines

An optical passive bus control system includes an access coordinator and control unit which is connected to the passive network in the same manner as other connected devices of the network. The access coordinator control means is located spatially close to the optical mixer, over connecting light wave guides which are as short as possible. The access coordinator and control unit contains a collision recognition device for recognizing an access collision, and includes means for implementing an asynchronous access operating mode in response to a collision recognition. A switch means is provided for emitting a signal to the bus, signifying a change to a synchronous operating mode in which no access collisions can occur.

Optical passive bus control system

A passive bus system for decentrally structured multi-computer systems, particularly multi-microcomputer systems, allows execution of a bit-serial information exchange between the individual computers of the system achieving the bandwidth required for high transmission speeds with simple and reliable means, capable of decentralized monitoring and control. Exclusively optical transmission means is employed for all data exchange operations in a communications level shared by all of the function units of the multi-computer system, exclusively decentralized control devices are individually allocated to the function units for control of the bus system seizure.

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Germering, Germany

Anton Sauer