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USB Active ExtensionAlthough a single cable is limited to 5 meters, the USB specification permits up to five USB hubs in a long chain of cables and hubs. Consequently the maximum possible signalling distance is 30 meters, using six 5-meter cables and five hubs. In actual use, the last hub is a more convenient endpoint since some USB devices include built-in cables intended to directly connect to a hub, setting the maximum useful signalling distance at 25 meters.
Because USB is able to provide power for additional devices connected to the bus, a special type of USB extender cable was created which consists of a miniature one-port USB hub molded into one end of a 5 meter cable. These mini-hubs are fully self-contained within the cable, requiring no separate bulky hub device, and are as simple to use as plugging cables together, with each hub drawing power through all the previous single-port hubs in the chain.
The bus power is limited however, so the most practical application is to use four single-port hub extender cables, one plain 5 meter cable, and then a powered multiport hub at the very end to support multiple additional USB devices. This is especially useful where a cool and quiet work area is needed, permitting a keyboard, mouse, flash drive, printer, etc to be used 25 meters from a loud heat-generating computer.
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Mini / Micro USB The Mini-B, Micro-A, Micro-B , and Micro-AB connectors are used for smaller devices such as PDAs, mobile phones or digital cameras. The Micro-USB is a further connector, that was announced by the USB-IF on January 4, 2007. It is intended to replace the Mini-USB plugs.
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Multi-Function CableThe Datalink Cable allowing High Speed file transfer between to two PC’s equipped with USB 2.0 Ports.
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USB DC Power CableSingle 3.5mm DC Jack, supports upto 5V 500mA
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