USB Universal Serial Bus features

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USB (Universal Serial Bus) features

• Hot-swappable and Self-configuring connections
  You can plug and unplug a device from the bus
  while the computer is running.
• Multiple device support Two or more USB ports on
  PCs . 127 devices can be connected to the bus.
• High-speed data transfers-- USB specification
  enables up to 480 Mbps data transfer rates.
• Two classes
• Host- One host per bus. This class is responsible
  for managing the USB bus. (power provision,
  configuration process management, adding and
  removing devices)
• Device - Two sub classes FUNCTIONS and HUBS
• Functions include peripherals connected to the
  USB bus. This equipment can send and receive data
  from bus as well as control data flow.
• Hubs defines the expansion devices that
  provide no functionality other than providing
  more USB ports.

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USB device classes

• Audio-- Audio input and output devices, including
  MIDI instruments.
• Communications device Network adapters,
  including wireless network adapters.
• HID (Human Interface Device) Keyboard, mice,
  joystick, Point of sale devices such as barcode
  scanners and scales, arcade such as coin changers
  , general input and output devices, and other.
• Imaging Still digital cameras and scanners.
• IrDA Bridge Supplement or replace IT
  transceivers built into the motherboard.
• Mass storage -- Hard drives and optical drives,
  card readers and digital cameras that use the
  mass storage interface.
• Monitor
• Printer
• Video- Video cameras and video capture devices.

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USB versions

• USB 1.1
• Up to 12 MBps transfers
• USB 2.0
• Three speeds 1.5 MBps, 12 MBps, and 480 MBps
• Backward compatible

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USB symbols
USB port symbol
USB 2.0 label
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USB devices in Device Manager
USB 2.0 hosts which Windows calls hubs include
Enhanced in their names. Hubs without that
word in the name are USB 1.1 hubs.
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USB ports
Type A
Type B
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USB connectors
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USB power

• USB host provide 5 volts, 6 amps 30 watts power
• Best for small-draw devices, such as USB hubs
• Use a powered hub with many devices or high-draw
  devices
• www.usb.org for the latest info

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Installing USB devices

• Run setup program from device manufacturer
• Connect USB device
• Bar code readers
• Keyboards
• Mice
• Touch screen monitors
• Multimedia devices
• Scanners/printers
• Biometric devices
• Restart your computer

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FireWire features

• FireWire also known as (Institute of Electrical
  and electronic Engineers) IEEE 1394 and i.Link,
  is a high speed peripheral interconnection bus.
  FireWire offers these features
• Hot-swapping and self-configuration
• Multiple device support Up to 63 devices (16
  physical)
• Data transfer rates of 800 Mbps and beyond
• Asynchronous and isochronous transfer modes
• Time-dependent. Pronounced eye-sock-ra-nuss, it
  refers to processes where data must be delivered
  within certain time constraints. For example,
  multimedia streams require an isochronous
  transport mechanism to ensure that data is
  delivered as fast as it is displayed and to
  ensure that the audio is synchronized with the
  video.
• Supports time-critical transfers on the bus, such
  as real-time video
• Based on the Serial SCSI standard
• Peer-to-peer bus

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FireWire versions

• Original IEEE 1394 specs as FireWire 400
• Up to 400 MBps
• Cables up to 4.5 meters
• (Daisy chain up to 72 meters)
• IEEE 1394b as FireWire 800
• Base speed 800 MBps
• 1.6 and 3.2 GBps versions available
• Cables up to 4.5 meters
• (Extend to 1000 meters with optical repeaters)

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Isochronous transfers

• Time-critical transfer of data
• Video capture
• Real-time video
• Machine control

No interruption is allowed otherwise data will be
lost.
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4-pin FireWire ports, connectors
Used at the device end of the cable
14
6-pin FireWire ports, connectors
The new style Fire Wire 800 uses 9pins
Hooks up to the PC
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FireWire power

• IEEE specification 30 volts, 1.5 amps 45 watts
  power
• Higher power provisions than USB
• Thus fewer problems connecting un powered
  FireWire devices to the bus.

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Installing FireWire devices

• No device drivers for expansion adapters or
  devices in
• Windows 2000 Professional
• All Windows XP versions
• OS interacts with device using IEEE 1394
  specifications
• Simply plug in
• Video cameras
• Printers
• External drives

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Wireless connections

• Infrared
• Radio
• Bluetooth

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Infrared

• Pulses of infrared light to transmit signal
• Connection speeds run from 9600 bps to 4 Mbps
• Typical max 10 20 feet range
• Direct line of sightanything off by 45 degrees
  wont connect.
• Most popular form of infrared wireless is the
  Infrared Serial Data Link (ISDL)
• 1.5 Mbps
• 20 feet

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IrDA (Infrared Data Association) port
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Radio

• Modulated signals sent over radio waves
• Passes through most no metallic media
• Not line of sight
• Varying technologies with varying features
• 802.11g 54 Mbps
• For LAN and WANs

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802.11g wireless router