Date Added: Jan 2010
Ethernet is the most common network in use today. About 90% of all Local Area Networks (LANs) today use Ethernet equipment. This equipment comes in three basic speeds: 10 Mbps (802.3), 100 Mbps (Fast Ethernet 802.3u), and 1000 Mbps (Gigabit Ethernet 802.3z/802.3ab). A fourth network speed of 10 Gigabit/sec (802.3ae) is currently being developed. Even though the cost of high-speed networking equipment has dropped significantly, the deployment of the technologies has not kept pace with expanding networking needs. One thing hampering the migration to 1000BASE-T is performance problems associated with the physical layer. The physical layer defines the electrical, mechanical, and functional specifications for establishing the physical links between systems.