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 HUBSFunctions –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.

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.

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

USB symbols

USB port symbol

USB 2.0 label

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.

USB ports

Type A

Type B

USB connectors

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

Installing USB devices

1. Run setup program from device manufacturer2. Connect USB device

Bar code readers Keyboards Mice Touch screen monitors Multimedia devices Scanners/printers Biometric devices

3. Restart your computer

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 modesTime-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

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)

Isochronous transfers

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

No interruption is allowed otherwise data will be lost.

4-pin FireWire ports, connectors

Used at the device end of the cable

6-pin FireWire ports, connectors

Hooks up to the PC

The new style Fire Wire 800 uses 9pins

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.

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

Wireless connections

Infrared Radio Bluetooth

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 sight—anything off by 45

degrees won’t connect. Most popular form of infrared wireless is the

Infrared Serial Data Link (ISDL) 1.5 Mbps 20 feet

IrDA (Infrared Data Association) port

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

802.11g wireless router