Usb Presentation

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

4 ft) Longer connections use hubs or bustling extensions Active extension incorporates a bus major supply 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 nevertheless one host in any USB system typically implemented in PC chipset (root hub) Host responsibilities Detect attachments and removals monitor control and data flow between host and devices oversee status and activity Provide power to attached devices classify drivers included in most in operation(p) systems ! Hubs Combined partition and repeater mustiness detect connections and disconnections downstream and report to host moldiness manage downstream power Bus-powered hubs (Power from upriver) Must string up 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, lodge it on our website: OrderEssay.net

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