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USB

USB. Universal Serial Bus. Most popular Serial Peripheral bus WWW.USB.ORG. SERIAL. Bit after bit after bit instead of several bits at once Referenced as M b ps (why?). Universal SERIAL Bus. Anything to do with serial transmission was traditionally difficult to set up

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USB

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  1. USB Universal Serial Bus

  2. Most popular Serial Peripheral bus • WWW.USB.ORG

  3. SERIAL • Bit after bit after bit instead of several bits at once • Referenced as Mbps (why?)

  4. Universal SERIAL Bus • Anything to do with serial transmission was traditionally difficult to set up … because of start, stop and handshaking

  5. Hot Swappable • USB is hot swappable or hot pluggable ------ PnP = Plug and Play • You can connect it without opening the machine

  6. How ? • A USB Host Controller should be included in the chipset • The USB host controller allows for the use of just one IRQ

  7. USB 1.0 • Low Speed • Announced November 1995 • Released January 1996 • 1.5 Mbps

  8. USB 1.1 • Full Speed • December 1998 • Adopted by Windows 98 • 12 Mbps

  9. USB 2.0 • High Speed • 2000 • 480 Mbps

  10. Wireless USB • 2005

  11. USB 3.0 • Superspeed • 4.8 Gbps to 5 Gbps approx • mid-2008 announcement, but not yet globally available

  12. USB Speeds • Superspeed – 4.8Gbps to approx 5Gbps • High Speed - 480Mbps • Full Speed - 12Mbps • Low Speed - 1.5Mbps

  13. USB Connectors • Type A • Type B • Mini Type A • Mini Type B • Micro USB (Jan 2007)

  14. USB Type A Type A sockets will typically be on hosts and hubs

  15. Type A or Series A Plug & Receptacle

  16. USB Type B Plug and Receptacle Type B plugs are on devices.

  17. Mini A and Mini B

  18. Micro USB Micro USB Vs Mini USB on new RAZR2 cell phoner released May 2007

  19. USB Hub

  20. First computer to offer USB as standard ? Bondi Blue iMac

  21. Connector problems ?

  22. Max length of a USB Cable ? • 5 Meters for Hi-speed USB ( 16 feet & 5 inches) • 3 Meters for Full-Speed USB (9 feet & 10 inches)

  23. Feet from meters ? • Multiply by approx 3.3

  24. Does your system support USB ? Which one ? • Hi-Speed USB ? • Open Device Manager & expand the Universal Serial Bus section. => There should be an "Enhanced" USB host controller present.

  25. USB Driver updates ? • Keep current with your OS • Go to TOUCHSTONE software and use the free scan

  26. Windows Support for USB • Windows 95 OSR 2.1 was the first Windows OS to support USB • Windows 98, 2K and XP support USB • Windows XP supports high speed USB with a service pack • Windows NT never supported USB

  27. For USB to work … • A motherboard or expansion card that supports USB • An OS that supports USB • A USB device • The USB device’s drivers

  28. Firewire • First introduced by Apple Computer • Mid 1980’s Apple engineers developed a method of transferring data between the hard drives in a Mac – they called it firewire.

  29. Apple brought Firewire to the IEEE • IEEE released it as standard IEEE 1394 in December 1995

  30. Some differences between Firewire and USB? • Firewire started off at speeds of 100 Mbps +. • Firewire was not intended for slower peripherals like mice and keyboards • Firewire can connect up to 63 devices in daisy chain, USB can connect up to 127 devices in daisy chain

  31. Similarities • Both are Serial bus standards • Both are hot-swappable / hot-pluggable

  32. Firewire Standards • 1394a : also known as Firewire 400 Supports speeds of up to 400 Mbps • 1394b : also known as Firewire 800 Supports speeds of up to 800 Mbps A newer FireWire standard that supports data transmission at up to 3.2 Gbps is now being developed.

  33. IEEE 1394a • Firewire (Apple name) • i.Link (Sony name) • Lynx

  34. Symbol

  35. How do you know if Firewire is supported by your motherboard ? • Open Device Manager and check for the 1394 Bus Controller as an installed device • None present ? - Expansion Card

  36. No Firewire Ports ? • Install an adapter card

  37. Firewire Connectors ? • 1394a : 4 pin and 6 pin • 1394b : 9 pin Cables and Connectors

  38. Firewire Plug and Connectors

  39. Firewire Max Cable Length • Maximum cable length device to device for 1394a (Firewire 400) is 4.5-meters (14.85ft). • 10 meter (32ft) cable with a hub/repeater extends FireWire over longer distances.

  40. Firewire Max Cable Length • Maximum cable length device to device for 1394b (Firewire 800) is 100 Meters (328 feet)

  41. Assignment • Use this link : USB Vs Firewire .. to describe the differences between USB and Firewire

  42. 3 Related Terms • Asynchronous • Synchronous • Isochronous

  43. Synchronous Happens on a clock signal Happens after a definite time quantum

  44. Asynchronous happens at irregular intervals, without the use of a clock signal

  45. Examples of synchronous and asynchronous communications • Telephone conversation – asynchronous • Transmission of files – could be asynchronous or synchronous • Transmission of a definite preset amount of data at a time - Synchronous

  46. Key • Synchronous transmission is rigid, asynchronous transmission is flexible

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