Usb Presentation

USB (Universal Serial jitney) Presentation to UCHUG - 2/06/08 G. Skalka What is USB? Universal Serial coach A computer peripheral interface Ubiquitous across all computer platforms Several variations - continues to evolve Hot-swapable Provides three advantages posture expansion Performance Standard connection method In the grey-haired Days . . . Mice and keyboards only connected to dedicated connectors or resultant air Networking (as such) was only through serial com style Printers had their give birth connector Not much else! distinctive Performance USB provides much higher(prenominal) selective information transfer speeds, with fewer wires! Birth of USB Defined by Intel and other industry leadership in early mid-nineties Ease of use was principal(a) goal Four-wire interface Point-to-point, emcee-target architecture Bus expansion commute legacy connectors USB Connectors USB Cables Four wires (+5V, Return, data t wisted pair) Up to 5 m (16.4 ft) Longer connections use hubs or officious extensions Active extension incorporates a bus major power 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 merely one host in any USB system typically implemented in PC chipset (root hub) Host responsibilities Detect attachments and removals palm control and data flow between host and devices monitoring device status and activity Provide power to attached devices come apart drivers included in most in operation(p) systems Hubs Combined divider and repeater mustiness detect connections and disconnections downstream and report to host mustiness manage downstream power Bus-powered hubs (Power from upriver) Must shit no more than 500 mA from upstream Must s upply 100 mA to each downstream port Sel! f-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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