Collision detection method using CRC code

Details Collision detection method using CRC code Collision detection method using CRC code

1983-01-24

1986-02-25

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

370 85, 371 57, H04Q 900

Patent

active

045730458

ABSTRACT:
A method for detecting collisions between digital messages transmitted on a common cable communication system is disclosed. A transmitting station computes a cylic redundancy checking (CRC) code for the transmitted message, and stores the value of the code after N bits have been sent. N bits corresponds to the number of bits transmitted during the "collision window" of the particular system. The transmitting station monitors the receive channel and computes a CRC value for N bits of the received message. If the CRC value calculated for the received message does not match the stored CRC value for the transmitted message, a collision is assumed. If no message is received by the transmitting station after the collision window has elapsed, a collision is also assumed.

REFERENCES:
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patent: 4271523 (1981-06-01), Gable
patent: 4281380 (1981-07-01), DeMesa, III et al.
patent: 4292623 (1981-09-01), Eswaran et al.
patent: 4332027 (1982-05-01), Malcolm et al.
patent: 4354252 (1982-10-01), Lamb et al.
patent: 4412326 (1983-10-01), Limb
patent: 4500989 (1985-02-01), Dahod

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