2-out-of-3 Selecting facility in a 3-computer system

Details 2-out-of-3 Selecting facility in a 3-computer system 2-out-of-3 Selecting facility in a 3-computer system

1983-02-28

1986-10-07

Thomas, James D.

Boots, shoes, and leggings

371 36, 371 11, G06F 1118, G06F 1100

Patent

active

046163123

ABSTRACT:
A fail-safe 2-out-of-3 selecting facility for a 3-computer system is disclosed which is especially suitable for use together with microprocessors having a large number of outputs. The computers (R1 . . . R3) of the 3-computer system handle the same information in parallel but asynchronously, exchange their results, and compare them. The output buses (A1, A3) of two computers (R1, R3) transfer the results in nonequivalent form, and are connected to two data output channels (AK1, AK2) via separate transfer switches (U1, U2). Depending on the result of the comparisons performed in the computers, the output ports of faulty computers are disconnected and the transfer switches are controlled in such a way that the output port of a faulty computer is disconnected from the associated data output channel, and that the output port (A2) of the third computer (R2) is connected to this channel instead. Depending on which computer is to be replaced, the third computer (R2) delivers its information in uninverted or inverted form. The operation of the transfer switches can be monitored by a serial nonequivalence check on the information transfered over the data output channels (AK1, AK2).

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