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Redundant Data System for Checking Data Transmission Errors

IP.com Disclosure Number: IPCOM000077450D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Bodendorf, DJ: AUTHOR [+4]

Abstract

A data-handling system is composed of subsystems. Each subsystem transmits data to and receives data from other subsystems. Errors can occur within any subsystem and on the data bus interconnecting these subsystems. The arrangement depicted in the figure allows a "following" subsystem to detect data errors occurring in a "preceding" subsystem, or in the data bus interconnecting the two subsystems.

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Redundant Data System for Checking Data Transmission Errors

A data-handling system is composed of subsystems. Each subsystem transmits data to and receives data from other subsystems. Errors can occur within any subsystem and on the data bus interconnecting these subsystems. The arrangement depicted in the figure allows a "following" subsystem to detect data errors occurring in a "preceding" subsystem, or in the data bus interconnecting the two subsystems.

A duplicate subsystem A' is provided for each preceding subsystem A comprising the data-handling system. Identical data are supplied to subsystem A and to duplicate subsystem A' and are directed via respective switches to a common data bus. The data bus supplies the redundant data via a reversing switch to a following subsystem, which functions to store and to compare the received data. The data comparison detects any errors occurring in the preceding subsystems A and A', or in the data bus interconnecting the preceding and the following subsystems.

The data from subsystem A is supplied to the common data bus when the respective switch is actuated during time T1. Redundant data is supplied by duplicate subsystem A' when its respective switch is actuated during time T2. Whereas the data from subsystem A is applied in a normal sense to the data bus, the data from subsystem A' is applied in an interchanged sense. For example, assuming a multiplicity of data channels within the data bus, the data from subsystem A which is applied to the eve...