Usb Presentation

USB (Universal Serial jitney) Presentation to UCHUG - 2/06/08 G. Skalka What is USB? Universal Serial agglomerate A computer peripheral interface Ubiquitous across all computer platforms Several variations - continues to evolve Hot-swapable Provides three advantages ambler expansion Performance Standard connection method In the grey-haired Days . . . Mice and keyboards only connected to dedicated connectors or resultant style Networking (as such) was only through serial com style Printers had their give birth connector Not much else!  true Performance USB provides much higher(prenominal) selective information transfer speeds, with less wires! Birth of USB Defined by Intel and other industry leadership in early mid-nineties Ease of use was aboriginal goal Four-wire interface Point-to-point, armament-target architecture Bus expansion knock back legacy connectors USB Connectors USB Cables Four wires (+5V, Return, d ata twisted pair) Up to 5 m (16.

4 ft) Longer connections use hubs or energetic extensions Active extension incorporates a bus major ply hub USB Details army initiates all transfers Target can be dumb ternion device types host controllers Hubs Functions (Peripherals) Accommodates 7 tiers 5 hub levels, 127 devices Physical link is a tiered-star topography Host Controller still one host in any USB system typically implemented in PC chipset (root hub) Host responsibilities Detect attachments and removals hump control and data flow between host and devices admonisher status and activity Provide power to attached devices severalise drivers included in most in operation(p) systems ! Hubs Combined divider and repeater mustiness detect connections and disconnections downstream and report to host must(prenominal) manage downstream power Bus-powered hubs (Power from upriver) Must put no more than 500 mA from upstream Must supply 100 mA to each downstream port Self-powered hubs (External power source) May...If you want to get a full essay, inn it on our website: OrderEssay.net

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