Local Area Networks (LANs)

• Local Area Network (LAN) is a fast (at least ~ Mb/s), geo-graphically limited (~ km) digital communications network, which is owned and operated by the user organization

History of LANs

• Packet radio neworks (Aloha ja Slotted Aloha) in Hawaii

• Ethernet

  • The first LAN was the early version of Ethernet in 1976, about 3 Mb/s
  • Digital-Intel-Xerox “DIX” specification in 1979, 10 Mb/s
  • Ethernet 2 in 1982

• Token Ring

  • IBM Token Ring in 1985, 4 Mb/s
  • Later also 16 Mb/s version

• Fiber Distributed Data Interface (FDDI), 100 Mb/s

• High-speed Ethernet: 100 Mb/s and 1 Gb/s

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