G - Physics – 06 – F
Patent
G - Physics
06
F
340/70
G06F 11/16 (2006.01) G06F 11/00 (2006.01) H04L 12/437 (2006.01)
Patent
CA 1294683
23930-293 ABSTRACT Disclosed are a process and system for technically secure transmission of serial data between secure computers, pre- ferably working in two channel mode by the use of a double-ring bus system. In normal operation data passes through the two ring buses parallel-redundantly in opposite directions; one channel of each computer is associated with one ring bus through active bus couplers. In the event of a failure the ring buses are interrup- ted cyclically, section by section, so as to localize the failure, and cross connections to the other ring bus are created. Once the failure has been localized, the adjacent sectors are changed per- manently to a simple ring structure with no redundancy, and the section with the failure is separated. According to the present invention, an active main station with a two-channel main computer is provided to control the ring buses; this main computer adminis- ters hierarchically bus access rights for the other bus partici- pants with their own computers and compares the circulating data of one ring bus with the transmission data of the other ring bus, and vice versa diagonally. Non-comparison marks a failure, which initiates reswitching to test mode, during which the substations are polled cyclically by the main station, when in each instance active bus couplers that are combined by pairs into bus control units create interruptions and cross connections until a lack of conformity of the transmitted and the received data within the main station signals the site of hte failure, which initiates switching to the "FAILURE" mode.
544930
Fetherstonhaugh & Co.
Licentia Patent-Verwaltungs-Gmbh
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