Collision detection circuit for communications network
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United States of America Patent
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-
Mar 23, 1993
Grant Date -
N/A
app pub date -
Mar 28, 1991
filing date -
Mar 28, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A collision detection circuit which indicates to a processing node, while the node is transmitting, that another transmission has, or is occurring, on the network comprises a means for directionally coupling a processing node to the network to discriminate between the outgoing power associated with a first message packet and the incoming power associated with a second message packet. A sensing means receives the incoming power from the directional coupling means during the transmission of the first message packet and indicates that a collision is occurring between the two transmissions. The directional coupling means comprises a cross-coupled voltage divider network configured such that a nulled voltage is generated at a pair of collision detection ports in response to the outgoing transmission, whereas a differential voltage is produced across the collision detection ports whenever an incoming colliding transmission appears.
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