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Networks

Mr. Allison - Tech II

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Ethernet

  • originally based on the idea of computers communicating over a shared coaxial cable acting as a broadcast transmission medium
  • "Ethernet" was derived the idea of Luminiferous aether in 19th century physics (taken over by the theory of relativity and quantum theory - light moved through “ether”_

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Ethernet

  • Ethernet was developed at Xerox PARC between 1973 and 1974
  • Systems communicating over Ethernet divide a stream of data into shorter pieces called frames.
  • Each frame contains source and destination addresses and error-checking data so that damaged data can be detected and re-transmitted.

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Ethernet

  • 1980 became standardized by IEEE
  • Repeaters /Hubs
  • Bridging and switching
  • Advanced Networking

Speeds:

  • The Ethernet physical layer evolved over a considerable time span and encompasses coaxial, twisted pair and fiber-optic physical media interfaces, with speeds from 10 Mbit/s to 100 Gbit/s, with 400 Gbit/s expected by 2018

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Wireless Networking

The first professional wireless network was developed under the brand ALOHAnet in 1969 at the University of Hawaii and became operational in June 1971. The first commercial wireless network was the WaveLAN product family, developed by NCR in 1986.

  • 1991 2G cell phone network
  • June 1997 802.11 "WiFi" protocol first release
  • 1999 803.11 VoIP integration

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Wireless Networking

  • Terrestrial microwave
  • Communications satellites
  • Cellular and PCS systems use several radio communications technologies
  • Radio and spread spectrum technologies (AM/FM)

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Wireless Networking

Types:

  • PAN - Personal Area Networking (bluetooth, zigbee)
  • WLAN - Wireless Local Area Network
  • Wireless Ad-hoc Network
  • Wireless MAN - Metropolitan - WiMax
  • Cellular
  • Global - Satellites

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Wireless Networking

  • Each Wi-Fi standard is rated according to its maximum theoretical network bandwidth:
    • 802.11b offered up to 11 megabits per second (Mbps)
    • 802.11a and 802.11g offer up to 54 Mbps
    • 802.11n offers up to 300 Mbps
    • 802.11ac offers up to 1 Gbps (1000 Mbps)

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