Syllabus 

Types and characteristics of communication standards including;                12 ATAR

  • 802.11x (wireless)
  • 802.3 (ethernet)

Background

  • communication standards state the expected characteristics for that type of communication. 
  • 802.3 is a standard specification for ethernet
  • 802.11 is a standard specification for wireless

802.3 or Ethernet

802.3 10Mbps

  • standard ethernet
  • commonly uses twisted pair

802.3 100 Mbps

  • Fast ethernet 
  • Cat 5 twisted pair cable or fiber optic (not coax)

802.3 1 Gbps Mbps

  • Gigabit ethernet 
  • uses full duplex operation with dedicated pairs for transmission and receive
  • need to have full-duplex NIC
  • must use a switch (not a hub)

802.3 10 Gbps

  • Ten-Gigabit ethernet 
  • maximum distance covers 300-400 metres
  • full duplex mode only
  • uses optic fibre only

802.3 Cable Types 10(data rate in Mbps) Base (baseband signalling or single signal) 5 cable type or length limit

  • Name: 10Base5 or thicknet was a first version of ethernet
  • Cable: thick coax
  • Max Cable Run: 500 meters
  • Segments: 100
  • Topology: Bus
  • 10 Mbps over thick coaxial cable for about 500 metres
  • Name: 10Base2 or cheapernet was a first version of ethernet, but with thin coax
  • Cable: thin coax
  • Max Cable Run: about 200 metres
  • Segments: 30
  • Topology: Bus
  • 10 Mbps over thin coax for about 200 metres
  • Name: 10BaseT (the T stands for twisted pair)
  • Cable: twisted pair
  • Max Cable Run: 100 meters
  • Segments: 1
  • Topology: Star
  • 10 Mbps over unshielded twisted pairs with RJ45 connectors
  • Name: 10BaseF (the F stands for Fibre Optic)
  • Cable: Fibre Optic
  • Max Cable Run: 2000 metres
  • Segments: 1
  • Topology: Star

802.3 Advantages

  • not expensive to implement
  • simple to join, connect to switches
  • flexible cabling

802.3 Disadvantages

  • only good for light loads of 30% capacity
  • data packet collisions cause many resends
  • one fault and the whole system goes down

802.11 or wireless or wifi

802.11a wifi

  • July 1999
  • up 11 Mbps
  • on 2.4 Ghz
  • Ads = low cost, good signal, range 35m indoors, 120m outdoors
  • Disads = slow speed, some interference, can't work with 802.11b

802.11b wifi

  • July 1999
  • up to 54Mbps
  • on 5 Ghz
  • Ads = faster than 802.11a, little interference, range
  • Disads = high cost, shorter range or length of signal, can't work with 802.11a

802.11g wifi 

  • 2002/2003
  • up to 54 Mbps
  • on 2.4 Ghz
  • Ads = faster than 802.11b, good range, can work with 802/11b
  • Disads = higher cost than 802.11b, some interference

802.11n wifi

  • 2009
  • up to 300 Mbps
  • 2.4 Ghz and 5 GHz because uses multiple signals and antennas
  • channel width of  40 MHz
  • MIMO Multiple Input, Multiple Output with 4 spatial streams
  • Ads = fast speed, best signal range of length of signal (max 100m), little interference
  • Disads = cost more, can interfere with 802.11b and 802/11g

802.11a/c wifi

  • 2014
  • from 430 Mbps to 2 or 3 Gbps
  • on 5 MHz
  • MIMO with 8 streams each of width 80 MHz
  • uses beamforming to direct signal to improve communications, uses smart antenna which track the device Ref: Extreme Tech
  • Ads = can work with 802.11g/802.11n, very fast, range max 50m,

 For You To Do

  1. Create graphics that contribute to a class poster for validation techniques. Start this by going to an online form and taking a screen shot.

 Learn more from W3C standards, ieeee ethernet, ieeee wireless,  
 
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