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Visit for more Learning Resources USB SERIAL BUS STANDARD TO INTERFACE DEVICES Allow devices to be connected with single std. scoket Allow plug n play i.e connecting and disconnecting without rebooting computer i.e hot swapping Visit for more Learning Resources

Low power consumption No need of external power supply Allow devices to be used w/o drivers installed Can connect mouse, k/b,joystick, cameras,printers,scanners.. Designed by USB_IF(incorporating Forum) V can install and remove devices without opening case

Usb is better than RS232 Easy installation Fast transfer rate Simple cabling Multiple device connection

versions Low speed 1.5mb/s used for k/b, mouse, joystick Full speed 12mb/s USB 2.0 FCFS rule for many devices Hi Speed of 480mb/s Super Speed 4.8Gb/s

Features Host Multiple devices 127 Cable length 5 to 30m Transfer rate 12 mb to480mb/s Ease of installation Hot swappable plug and unplug anytime Hot pluggability BIOS feature allow to plug n play

Power saving Support wide range of devices Hub architecture

Connectors & cables A upstream towards computer B downstream to individual devices Max length of cable is 5m 26 ns delay is maximum Contains 4 wires VCC red +5v D- white Data- D+ green Data+ GND Black Ground

For more detail contact us Usb process Host queries all devices and assigns address to each is called enumeration Each device transfer different data 1)Interrupt little data mouse,k/b 2)Bulk data in one big pkt printer 64 byte 3)Isochronous streaming devices example speakers USB divides BW into frames first for isochronous nd remaining for other bulk and interrupt For more detail contact us