Mini USB 2.0 CABLE
Mini
A type 4-pin with 1-Guiding-Rail Male to
Mini
A type 4-pin with 1-Guiding-Rail Male
for reference only:
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USB’s Potential and
Limitations
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USB was introduced in 1995 and, until recently,
offered 12 Mbits/second transmission speed. The development of Hi-Speed
USB increased this speed to 480 Mbits/second – blazing, compared the 115
Kbytes/second speed of a standard parallel port.
The USB connectivity standard enables “plug and play” connections to
devices such as printers, keyboards, mice, camcorders and digital
cameras. Plug and play means devices can be connected and disconnected
without the need to shut down the computer or install special software.
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USB Cables
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USB cables are shielded with foil/braid and feature one twisted pair to
transfer data and two power conductors to transfer power from the host
device.
The USB specification requires an A-type jack on the PC and a B type
jack on peripheral devices that are connected with detachable cables.
The cables your customers will need to connect normal USB products are A
to B cables, A to mini B cables or mini A to mini B cables of various
lengths. To ensure optimum performance of low- and high-speed USB
equipment, make sure these cables are Revision 2.0 compliant. Revision
1.1 cables will considerably slow down Revision 2.0 equipment.
Note that there are a few exceptions to the above. Some special devices
use nonstandard connectors and so come with their own cable.
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USB Networking -
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).
These distances can be extended by adding one or more USB hubs.
Up to 5 hubs can be connected serially with 5-meter cables, allowing
devices to be placed up to 30 meters from the PC. With a low-speed
device, the limit is about 25 meters from the PC.
A USB active extension cable will accomplish
this extension without a hub. If a customer needs to go farther, a USB
line extender, which converts the USB signal to run over RJ45 network
cable and then back, can allow runs up to 150 feet.
USB topology can be
layered in tiers or star shaped with the use of hubs to enable up to
127 devices to share a single USB port. Virtually any type of
USB-enabled device can be included in this topology.
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