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[4] [5] Carrier-sense multiple access with collision detection CSMA/CD is used to improve CSMA performance by terminating transmission as soon as a collision is detected, thus shortening the time required before a retry can be attempted. CSMA/CD is used by Ethernet. Carrier-sense multiple access with collision avoidance
CSMA/CD is still supported for backwards compatibility and for half-duplex connections. The IEEE 802.3 standard, which defines all Ethernet variants, for historical reasons still bore the title "Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications" until 802.3-2008, which uses new name ...
Distributed coordination function (DCF) is the fundamental medium access control (MAC) technique of the IEEE 802.11-based WLAN standard (including Wi-Fi).DCF employs a carrier-sense multiple access with collision avoidance (CSMA/CA) with the binary exponential backoff algorithm.
Carrier-sense multiple access with collision avoidance (CSMA/CA) in computer networking, is a network multiple access method in which carrier sensing is used, but nodes attempt to avoid collisions by beginning transmission only after the channel is sensed to be "idle". [1] [2] When they do transmit, nodes transmit their packet data in its entirety.
The article states that in non-persistent CSMA the station "senses the medium continually until it becomes idle". This is a perfect description for 1-persistent CSMA, a very greedy type of CSMA. In non-persistent CSMA the node checks the medium at a moment T1 and if it finds it busy it checks again after a random time interval dT.
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Source: [1] Node D is unaware of the ongoing data transfer between node A and node B. Node D has data to send to node C, which is in the transmission range of node B. D initiates the process by sending an RTS frame to node C. Node C has already deferred its transmission until the completion of the current data transfer between node A and node B (to avoid co-channel interference at node B).
Some books on networking have curves in which one can see the maximum throughput of 0.1-persistent CSMA, 0.01-persistent CSMA, ALOHA etc. in comparison on a single chart. Such a chart is extremely helpful to understand the performance of the different multiple access methodss. Subwy 15:32, 21 July 2008 (UTC)
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