Method and apparatus for preserving the integrity of the error d

Details Method and apparatus for preserving the integrity of the error d Method and apparatus for preserving the integrity of the error d

1985-10-01

1988-02-02

Smith, Jerry

Excavating

371 22, 370 86, G06F 1110

Patent

active

047232447

ABSTRACT:
An apparatus and method for use in a communications system to modify a check word associated with a data word to retain the integrity of the former when the latter has been changed at a node in the system. When binary symbols are used, the received data word and the modified data word are combined on a serial bit-by-bit basis in a first exclusive OR gate. The result is encoded using the same coding scheme as used with the received data and check words. The encoded signal and the received check word are provided as an input to a second exclusive OR gate on a bit-by-bit basis. The signal produced by the second exclusive OR gate is the modified check word; the modified check word is then appended to the modified data word for transmission over the network. The entire process can be carried out on a bit-by-bit basis, allowing information to be relayed through a network node with minimal delay.

REFERENCES:
patent: 3872430 (1975-03-01), Boudreau
patent: 4393497 (1983-07-01), Cantwell
patent: 4577313 (1986-03-01), Sy

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