Why are there collisions when a single half duplex device is...

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Question by pwg2004
Submitted on 3/6/2004
Related FAQ: comp.dcom.lans.ethernet FAQ
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Why are there collisions when a single half duplex device is connected to a switch port?How can there be a collisions when there is only one device on the port? Thank you very much.

Answer by pradeep
Submitted on 9/21/2004
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Collisions can still happen if several nodes (ie computers) send in packets and the switch buffer overflow has occured.

Answer by nkn
Submitted on 10/2/2005
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Half-duplex works optimally only if one device is transmitting and all the other devices are receiving, otherwise, collisions occur. When the collisions are detected, the devices causing the collision wait for a random time before retransmitting. Therefore, some collisions are inevitable.

Answer by bfinper
Submitted on 12/14/2005
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A device configured in half-duplex uses CSMA/CD. With CSMA/CD the RX circuitry is connected to the TX circuitry (see CSMA/CD implementation for more details on CSMA/CD). This is the reason why collisions happen, even if only one device is configured in half-duplex.

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