Method and apparatus for collision detection in a local area net

Details Method and apparatus for collision detection in a local area net Method and apparatus for collision detection in a local area net

1989-10-10

1991-04-30

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 8520, 370 8510, 3408255, H04J 302

Patent

active

050124676

ABSTRACT:
A collision detection circuit in a network transceiver detects collision among a type of digitally-encoded signals by detecting for transitions at a timed position relative to previous transitions within a preselected time tolerance band or window. (Manchester encoding is one such binary code, which has all data divided into bit cells containing the complement of a data bit and the value of the data bit separated by a transition ideally placed in the center of the bit cell.) Absent occurrence of such a transition, a signal is generated indicative of the occurrence of a collision between signals. A typical network in which the invention is used is a broadband network or a fiber optic network, and a typical use is in a CSMA/CD (Carrier Sense Multiple Access/Collision Detection) channel as for example defined by IEEE Standard 802.3 (Ethernet).

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