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collision method

Collision procedures are collision-based access procedures that regulate the access of connected stations to a transmission channel or to the transmission medium. In collision procedures, all stations are allowed to place their data for transmission on the communication medium without prior request and without being controlled by a central control unit.

The collision-based access method allows multiple accesses as long as they are sequential in time. If two or more stations transmit at the same time, collisions occur. The individual stations constantly monitor the data traffic on the transmission medium and thus detect any collisions. Depending on the collision procedure, these are remedied using different remedial strategies.

The most common strategy is for transmitting stations that detect a collision to abort the data transmission and randomly retry a transmission at a later time. If the network is heavily loaded, multiple attempts may result in longer delays. To reduce the delay times, the network sizes in which collisions occur are subdivided into smaller network segments, each of which forms a collision domain.

Ethernet uses such a collision method with CSMA/ CD, which uses the BEB method, Binary Exponential Backoff (BEB), as a delayed random principle.

Informations:
Englisch: collision method
Updated at: 06.01.2011
#Words: 193
Links: collision, transmission, channel, transmission medium, indium (In)
Translations: DE
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