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Personal Computer Data Communications

Personal Computer Data Communications. Digital Data. Data in a computer is stored as a series of bits , or binary digits. Each bit is a one or a zero, represented in a computer by electrical, magnetic and optical technology. Digital Data.

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Personal Computer Data Communications

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  1. Personal Computer Data Communications

  2. Digital Data Data in a computer is stored as a series of bits, or binary digits. Each bit is a one or a zero, represented in a computer by electrical, magnetic and optical technology. CIS 103 Applied Computer Technology

  3. Digital Data Every object in a computer’s memory is stored as a series of bits. Numbers CIS 103 Applied Computer Technology

  4. Digital Data Every object in a computer’s memory is stored as a series of bits. Text CIS 103 Applied Computer Technology

  5. Digital Data Every object in a computer’s memory is stored as a series of bits. Pictures CIS 103 Applied Computer Technology

  6. Digital Data Every object in a computer’s memory is stored as a series of bits. Sound CIS 103 Applied Computer Technology

  7. Digital Data Every object in a computer’s memory is stored as a series of bits. Video CIS 103 Applied Computer Technology

  8. Digital Data … every object is stored as a series of bits. 01000001 01000010 01000011 01000100 01000101 01000110 01000111 01001000

  9. Parallel and Serial Communication Bits can be moved in groups over several parallel wires at the same time… or one at a time over a single wire. 01000010 01000001 Parallel Communication 01000001 01000010 Serial Communication CIS 103 Applied Computer Technology Data Communications 9

  10. Serial and Parallel Communication • Parallel communication uses a set of wires called a data bus, so it is: • faster • more expensive • often used for short distances (inside a computer) An 8-bit word 01000010 01000001 The size of the data bus affects a computer’s word length. Data Bus

  11. Serial and Parallel Communication 01000001 01000010 Serial Communication • Serial communication: • is not as fast • is less expensive • is often used for long distances (between computers) • requires only one data wire • often uses two data wire s– one in each direction CIS 103 Applied Computer Technology

  12. Data Communication Standards a communicationsprotocol defines: • the electronic signals to be used • how fast the data should be sent • error checking methods • and other technical details CIS 103 Applied Computer Technology

  13. Data Communication Standards A data communication standard includes: • a communications protocol • the type of connectorsto be used • the type cablesto be used CIS 103 Applied Computer Technology

  14. Data Communication Standards Several agencies and associations maintain data communications protocols and standards: • International Telecommunications Union (ITU) – a technical committee sponsored by the United Nations • Institute of Electrical and Electronics Engineers (IEEE) – a professional group • Electronics Industries Association (EIA) – a trade association CIS 103 Applied Computer Technology

  15. Data Communication Standards Three commonly used serial communications standards are: • RS-232c • USB • Firewire CIS 103 Applied Computer Technology

  16. RS-232c The RS-232c standard: • was created by the IEA in 1969 for terminals connected to old mainframe computers • Used with early personal computers and telephone modems • not used as much today, but is still used with some printers and older equipment CIS 103 Applied Computer Technology

  17. RS-232c There are two types of RS232c connectors • 9-pin • 25-pin CIS 103 Applied Computer Technology

  18. USB In the 1990’s several computer companies formed a new trade association – the Universal Serial Bus Implementers Forum (USB-IF) – to develop a faster and less expensive data communication standard using newer technology. Their popular new standard is called USB (Universal Serial Bus). CIS 103 Applied Computer Technology

  19. USB USB is now the most widely used data communication standard for connecting devices to personal computers. CIS 103 Applied Computer Technology

  20. USB Three common versions of USB: • USB USB 1.1 (1994)12 mbps (megabits per second), cables up to 3 meters • Hi-Speed USBUSB 2.0 (2001) 480 mbps, 5 meters • SuperSpeed USBUSB 3.0 (2008) 5 gbps (gigabits per second), 5 meters CIS 103 Applied Computer Technology

  21. USB Connectors There are six different types of USB connectors. … more about USB in the next lesson CIS 103 Applied Computer Technology

  22. Firewire • first developed by Apple Computers • approved as standard IEEE 1394 in 1995 • Sony’s version is iLInk, Texas Instruments’ is Lynx • is the High Definition Audio-Video Network Alliance (HANA) standard for the audio visual industry • The automobile industry, the military, and the NASA Space Shuttle all use Firewire CIS 103 Applied Computer Technology

  23. Firewire Two common versions of Firewire: • Firewire 400 (IEEE 1394a)has a maximum data transfer rate of 400 Mbps • Firewire 800 (IEEE 1394b) is capable of 800 Mbps over standard cables and up to 3,200 Mbps using fiber optic cables CIS 103 Applied Computer Technology

  24. Firewire Connectors Both 6-pin and 4-pin Firewire connectors are common CIS 103 Applied Computer Technology

  25. Firewire vs. USB • Firewire is faster and more sophisticated than USB • Is capable of longer distances (up to 100 meters) • the equipment is significantly more expensive • It can be a little harder to use • USB is far more common for connecting devices to personal computers. CIS 103 Applied Computer Technology

  26. Next . . . Connecting USB devices to a personal computer CIS 103 Applied Computer Technology

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