Diff: Ethernet - Waikato Linux Users Group

Differences between version 8 and predecessor to the previous major change of Ethernet.

Other diffs: Previous Revision, Previous Author, or view the Annotated Edit History

Newer page:	version 8	Last edited on Thursday, October 2, 2003 4:35:01 pm	by JohnMcPherson	Revert
Older page:	version 4	Last edited on Monday, November 25, 2002 4:15:41 pm	by GerardSharp	Revert

@@ -1,16 +1,24 @@

A local area network first described by Metcalfe & Boggs of Xerox PARC in 1976. Also known as IEEE 802.3

Data is broken into frames and each one is transmitted using the CSMA/CD algorithm until it arrives at the destination without colliding with any other packet. A station is either transmitting or receiving or idle at any instant. Newer equipment supports full-duplex, where a station can transmit acknowledgments without halting a receive. Full duplex requires a switch with support, rather than a hub. The bandwidth is from 10 Mbit/s (ethernet) to 100 Mbit/s (fast ethernet) to 1000 Mbit/s (gigabit ethernet.) Some time ago, a 10 Gbit/s ethernet standard was agreed upon, and it is now (2002) possible to buy commercial equipment for this. Somewhere.

-Ethernet cables are classified as "XbaseY", e.g. 10Base5, where X is the data rate in Mbps, "base" means "baseband" (as opposed to radio frequency) and Y was originally the maximum cable run from end to end (500m for 10Base5, nearly 200m for 10Base2, 100m for 10BaseT), but the introduction of Fibre and 1000BaseT, the T more seems to refer to Twisted Pair these days. The original cable was ~~10base5~~ ("full spec"), others are [10Base2] and [10BaseT] which is now (2002) dissappearing. [100BaseT] is the desktop standard, and [1000BaseT] is quite reasonable for servers.

+Ethernet cables are classified as "XbaseY", e.g. [ 10Base5] , where X is the data rate in Mbps, "base" means "baseband" (as opposed to radio frequency) and Y was originally the maximum cable run from end to end (500m for [ 10Base5] , nearly 200m for [ 10Base2] , 100m for [ 10BaseT] ), but the introduction of Fibre and [ 1000BaseT] , the T more seems to refer to Twisted Pair these days. The original cable was [10Base5] ("full spec"), others are [10Base2] and [10BaseT] which is now (2002) dissappearing. [100BaseT] is the desktop standard, and [1000BaseT] is quite reasonable for servers.

Ethernet is at LAYER TWO - DATA LINK LAYER of the OSI model.