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In practice, the USB specification limits the length of a cable between full speed devices to 5 meters (a little under 16 feet 5 inches). For a low speed device the limit is 3 meters (9 feet 10 inches).We offered USB cable is 3m.
USB connectors - and, by extension, USB ports - can be found in two different styles: type "A" (for hosts and USB hubs) and type "B" (for peripheral devices). In addition, USB plugs fall into three different size ranges: standard, mini, and micro. Here's a general breakdown of how connector styles differ by size class, and the applications each is used for:
Standard USB: Standard is the original USB connector size, and the largest of the bunch. Standard-size "A" connectors have a long and extremely narrow rectangular shape (approximately 4mm x 12mm), while standard "B" connectors are still oblong, but with shorter and wider proportions (at roughly 7mm x 8mm, they're closer to being square). Standard USB connectors are typically used with, well, "standard" peripheral devices like printers, keyboards, computer mice and scanners.
Mini USB: Developed for use with small, portable peripherals like digital cameras, cell phones, PDA's and MP3 players, Mini USB connectors feature a more compact and space-efficient design than standard USB connectors. Unlike standard A and B connectors, Mini A and B have very similar shapes; however, it's possible to distinguish one from the other by the upper halves of their vertical edges: Mini A's sides are straight, but Mini B's are rounded.
Micro USB: In January 2007, the USB-IF approved the most space-conscious connector size to date: Micro USB. Micro USB connectors are approximately 50-60% smaller than mini connectors, and replace Mini USB in many new PDA's and Smartphones.
Yes. The new hi-speed data transfer rate is 480 Mb/s. There is, however, wide variation in edge rates. With typical line loads, full speed devices usually fall in the 12-25 ns range, and low-speed devices typically range 110-225 ns.
