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Fast Ethernet

100 Mbps ETHERNET

Initial specification was to provide ten times the capacity at twice the cost. Main standard 100BaseT.

100BaseT 

Defined by 802.3 committee. Maintains CSMA/CD access method. Supporters include Intel, Digital, 3Com, and National Semiconductors. Maximum span 250 meters.

100BaseT physical layer

Three physical Layer standards. 100BaseTX for two pairs of Cat5 UTP. 100BaseT4 uses four pairs of Cat3 UTP. 100BaseF uses Fibre.

Gigabit Ethernet (1GE)

The physical layer is based on standards develop from a point to point technology called fibre channel. It is used to interconnect high speed switches. available for both LAN and WAN. Mainly full duplex on fiber. Implemented by Telcos in WAN
A 100 meter over Cat5 available. It is full duplex technology using 4 pairs of Cat5. This product is now available.
This has prove to be a high successful technology standards completed in July 1998. It competes with ATM in LAN backbones. Adapted by TELCOs like Telstra are now available, Next step is 10GE.

1GE Standards

10 Gigabit Ethernet

Due to be released in July 2002 Range of standards for LAN and WAN. Exclusively full duplex mo support for collision detection. Fiber based. Very serious contender in WAN. Fully compatible with current 802.3 Standards so it uses the 1518 byte frame. Comforms to full duplex operating mode of 802.3 MAC. Half dupex mode will no longer be suppoerted.

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Last modified: October 03, 2004