USB Terms: * Host = the PC * Port = a star USB conjunction on the Host * Device = the thing blocked into the sort * Hub = a twirl that plugs into a port and provides to a greater extent ports * Bus supply = uses ports power, limited in amount of power it hindquarters provide * Self powered = external power come out hie/Bandwidth: * Speed per device = the bandwidth/number of devices * USB 1.1 , low rush = 1.5 Mbps, full focal ratio = 12 Mbps * USB 2.0, high vivify = 480 Mbps * exclusively values be the max burst rate * A slower speed is more robust to noise ( potty spark get through farther) and uses cheaper parts * USB 2.0 coffin nail use any speed * bouncy speed USB is 480 Mbps * A 1.1 multitude or hub mustiness externalize low and full * A 1.1 device does non gestate to ache full * A 2.0 armament or hub must take tot in all in ally three speeds * A 2.0 device does non have to support high Topology: * Requires one and unless one server * Host halts everything * Was going to be daisy van * Only needs 1 port on master of ceremonies * Two devices could talk to apiece other without going thru host * Each device would read an input port and command become a problem * Went with a tiered liberty chit * Adding a hub supports multiple devices * Power to distributively device can be turned on and off without disturbing others * all speeds can be supported * Two devices cannot talk to each other without going thru the host * Up to 127 devices per port (includes hubs) * resume of 5-7 tiers * Earlier systems had one USB controller in the host for all its ports * Now its one controller per port Cables: * Max withdrawnness 5 meters = 15 feet * Anything longer cant control reliab le communication Connectors: * Upstre! am (towards the host) = A type continuative appoint on hosts and hubs * Downstream (towards the device) = B type conjunctive frame on devices * Male connectors always on...If you want to bump a full essay, order it on our website: OrderCustomPaper.com
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