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- What is USB?
Universal Serial Bus is a high speed connectivity standard enabling simple plug and play connections to devices such as modems, digital cameras, camcorders, keyboards and mice. The standard is being supported by many leading suppliers of computers and peripherals. An attractive advantage of USB is that the devices are hot pluggable (liveconnection/disconnection without data loss or interruption). Devices manufactured to the current USB Revision 2.0 specification are backward compatible with version 1.1.
- Applications
Initially USB products were used mainly to link computers and their associated peripherals. Today USB is used in nearly every market including communications, entertainment, medical and automotive.
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| | USB Terms | | AWG#: The measurement of a wire's cross section, as defined by the American Wire Gauge standard. | | Bandwidth: The amount of data transmitted per unit of time, typically bits per second (b/s) or bytes per second (B/s). | | Device: A device that has a physical implementation such as a mouse, keyboard, data drive etc. | | Full-duplex: Computer data transmission occurring in both directions simultaneously. | | Full-speed: USB operation at 12 Mb/s. See also low-speed and high-speed. | | High-speed: USB operation at 480 Mb/s. See also low-speed and full-speed. | | Hub: A USB device that provides additional connections to the USB. | | Hub Tier: One plus the number of USB links in a communication path between the host and a function. | | Low-speed: USB operation at 1.5 Mb/s. See also full-speed and high-speed. | | Root Hub: A USB hub directly attached to the Host Controller. This hub (tier 1) is attached to the host. | | USB-IF: USB Implementers Forum, Inc. is a nonprofit corporation formed to facilitate the development of USB compliant products and promote the technology. |
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| USB Connectors | The USB specification requires a host system to be equipped with an A type jack. The B type jack is typically found on peripheral devices requiring detachable cables. Therefore, detachable USB cables are configured as an A to B male combination which prevents improper bus configurations
and topology miswiring. |
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| USB Cable Construction |  | L-com’s CSMUAA, CSMUAB, CSMUAX and CSUZAB cable series use 20 AWG power conductors.
All CSMUAMB (Mini B) cable series use 28 AWG power conductors. |
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| USB Topology | | USB is a serial, bi-directional bus that can be layered in tiers or star shaped with the use of a hub. USB does not require terminators or manual addressing. |
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© L-com, Inc. All Rights Reserved. L-com Global Connectivity and the L-com logo are registered marks.
L-com, Inc., 45 Beechwood Drive, North Andover, MA 01845
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