![]() ![]() ![]() The time is and randomly assigned, that is to say, more or less equally.Ĭollision avoidance is used to improve the performance of the CSMA method by attempting to divide the channel somewhat equally among all transmitting nodes within the collision domain. It's a bit what place in a meeting room when no master session (and all the World's polite) expected a silence, then a few moments before speaking, to allow time for someone else to speak. The countdown system prevents a station waiting too long before issuing its package. The waiting time random has the advantage of allowing a statistically equitable distribution of speaking time between the various network equipment, while making little unlikely (but not impossible) that both devices speak exactly the same time. ![]() She then continued his account countdown where it left off. However, if it is overtaken by another station, it stops immediately its countdown and waits for the next silence. If no equipment speaks before the end of the countdown, the station simply deliver its package. The maximum duration of this countdown is called the collision window (Window Collision, CW). After this compulsory period, the station starts a countdown for a random period considered. In other words, a station that wants to communicate 'listen' first on the media communication and awaits a 'silence' of a preset time (called the Distributed Inter Frame Space or DIFS). ![]()
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