Annotated edit history of
CSMA/CD version 4, including all changes.
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CraigMckenna |
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[Acronym] for __C__arrier __S__ense __M__ultiple __A__ccess / __C__ollision __D__etection |
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JohnMcPherson |
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A set of rules determining how network devices respond when two devices attempt to use a data channel simultaneously (called a collision). Standard [Ethernet] networks use [CSMA/CD]. This standard enables devices to detect a collision. After detecting a collision, a device waits a random delay time and then attempts to re-transmit the message. If the device detects a collision again, it waits randomly (up to twice as long as the previous attempt) to try to re-transmit the message. This is known as exponential back off. |
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JohnMcPherson |
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Some manufacturers don't (or didn't in the past) use exponential back off, so that in a mixed environment their cards would perform better (as measured by throughput). This however means that if you had a network of only their cards, as the network load goes up the network performance deteriorates quickly. Smart thinking... |
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CraigMckenna |
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[CSMA/CD] is a type of ContentionProtocol. |
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see also [CSMA/CA] |
