| Universal Serial Bus (USB) An external interface for communication between a computer and external over an inexpensive cable using transmission. USB is standard on current (1999) computers and is promoted by as an option for the where it is supported by later versions of . USB works at 12 Mbps with specific consideration for low cost peripherals. It supports up to 127 devices and both and data transfers. Cables can be up to five metres long and it includes built-in power distribution for low power devices. It supports through a tiered star multidrop topology. Before March 1996 Intel started to integrate the necessary logic into PC and encourage other manufacturers to do likewise, so widespread availability and support can be expected starting the second half of 1997. Because its relatively low speed USB is intended to replace existing , , , and connectors and be used with , , , , and possibly some low-speed and removable . For faster devices existing , , or emerging or interfaces can be used. {Home (http://www.teleport.com/~usb/)}. (1997-03-15) |
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