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Newer page: version 4 Last edited on Wednesday, March 10, 2004 8:05:53 am by JohnMcPherson
Older page: version 3 Last edited on Monday, December 9, 2002 1:02:16 pm by JohnMcPherson Revert
@@ -1,9 +1,9 @@
 [Acronym] for __C__arrier __S__ense __M__ultiple __A__ccess / __C__ollision __D__etection 
  
-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 twice as long to try to re-transmit the message. This is known as exponential back off. 
+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. 
  
 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... 
  
 [CSMA/CD] is a type of ContentionProtocol. 
  
 see also [CSMA/CA]