Differences between current version and revision by previous author of Ethernet.
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| Newer page: | version 9 | Last edited on Wednesday, October 15, 2003 4:46:36 pm | by CraigBox | |
| Older page: | version 8 | Last edited on Thursday, October 2, 2003 4:35:01 pm | by JohnMcPherson | Revert |
@@ -1,7 +1,7 @@
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.
+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 is at LAYER TWO - DATA LINK LAYER of the OSI model.
