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What is the method Ethernet uses to deal with collisions? Explain? griffinLincoln 10-March-2009 07:03:35 PMComments Carrier Sense Multiple Access/Collision Detection. Posted by sagitraz www.freepatentsonline.com/7047319.html Posted by crouse CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is the method Ethernet uses to deal with collisions. When a host wants to transmit, it first listens to the wire to see if anyone else is transmitting at that moment. If it is clear, it can transmit; if not, it will wait for the host that is transmitting to stop. Sometimes, two hosts decide at the same instant that the wire is clear, and collide with each other. When this happens, the hosts that were involved with the collision send a special jam signal that advises everyone on that segment of the collision. Then all the hosts wait for a random period of time before they check the wire and try transmitting again. This wait time is tiny—a few millionths of a second—and is determined by the backoff algorithm. (The backoff algorithm is the mathematical equation a host runs to come up with the random number.) The theory is that if each host waits a different amount of time, the wire should be clear for all of them when they decide to transmit again. Any Ethernet segment that uses coaxial cable (10-BASE 2, 10-BASE 5) or a hub with twisted-pair cabling is a collision environment. Posted by thomas |
Posted: 11-March-2009 12:53:04 PM By: thomas CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is the method Ethernet uses to deal with collisions. When a host wants to transmit, it first listens to the wire to see if anyone else is transmitting at that moment. If it is clear, it can transmit; if not, it will wait for the host that is transmitting to stop. Sometimes, two hosts decide at the same instant that the wire is clear, and collide with each other. When this happens, the hosts that were involved with the collision send a special jam signal that advises everyone on that segment of the collision. Then all the hosts wait for a random period of time before they check the wire and try transmitting again. This wait time is tiny—a few millionths of a second—and is determined by the backoff algorithm. (The backoff algorithm is the mathematical equation a host runs to come up with the random number.) The theory is that if each host waits a different amount of time, the wire should be clear for all of them when they decide to transmit again. Any Ethernet segment that uses coaxial cable (10-BASE 2, 10-BASE 5) or a hub with twisted-pair cabling is a collision environment. | |
Posted: 16-March-2009 05:00:12 AM By: crouse www.freepatentsonline.com/7047319.html | |
Posted: 19-March-2009 03:50:28 AM By: sagitraz Carrier Sense Multiple Access/Collision Detection. |