Some of the more common interconnection technologies are as follows:
?– FastEthernet (100-Mbps Ethernet): This LAN speci?¬?cation (IEEE 802.3u) operates
at 100 Mbps over twisted-pair cable. The FastEthernet standard raises the speed of
Ethernet from 10 Mbps to 100 Mbps with only minimal changes to the existing cable
structure. A switch that has ports that function at both 10 Mbps and 100 Mbps can
move frames between ports without Layer 2 protocol translation.
?– Gigabit Ethernet: An extension of the IEEE 802.3 Ethernet standard, Gigabit
Ethernet increases speed tenfold over that of FastEthernet, to 1000 Mbps, or 1 Gbps.
IEEE 802.3z speci?¬?es operations over ?¬?ber optics, and IEEE 802.3ab speci?¬?es
operations over twisted-pair cable.
Improving Performance with Spanning Tree 41
Figure 2-14 Interconnectivity at the User Level
?– 10-Gigabit Ethernet: 10-Gigabit Ethernet was formally rati?¬?ed as an 802.3 Ethernet
standard (IEEE 802.3ae) in June 2002. This technology is the next step for scaling the
performance and functionality of an enterprise. With the deployment of Gigabit
Ethernet becoming more common, 10-Gigabit Ethernet will become typical for
uplinks.
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