USB

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Universal Serial Bus (USB)
Certified USB.svg
Certified USB logo
Type Bus
Designer Digital Equipment Corporation, IBM, Intel, Microsoft, NEC an Nortel
Designed 1996
Manufacturer Intel, Compaq, Microsoft, NEC, Digital Equipment Corporation, IBM, Nortel
Supersedit Serial port, parallel port, gemme port, Apple Desktop Bus, PS/2 connector
Length 2–5 m (6 ft 7 in–16 ft 5 in) (bi category)
Width 12 mm (A-plug),[1] 8.45 mm (B-plug); 7 mm (Mini / Micro-USB)
Hicht 4.5 mm (A-plug),[1] 7.78 mm (B-plug, pre-v3.0); 1.5–3 mm (Mini/Micro-USB)
Het pluggable Yes
Freemit Yes
Cable 4 wires plus shield (pre-3.0); 9 wires plus shield (USB 3.0)
Pins 4: 1 supply, 2 data, 1 grund (pre-3.0); 9 (USB 3.0); 11 (powered USB 3.0); 5 (pre-3.0 Micro-USB)
Connector Unique
Signal 5 volt DC
Max. voltage 5.00±0.25 V (pre-3.0); 5.00+0.25-0.55 V (USB 3.0)
Max. current 0.5–0.9 A (general);
5 A (charging devices)
Data signal Packet data, defined bi specifications
Width 1 bit
Bitrate 1.5/12/480/5,000/10,000 Mbit/s (dependin on mode)
Max. devices 127
Protocol Serial
USB.svg
The staundart USB A plug (left) an B plug (richt)
Pin 1 VCC (+5 V)
Pin 2 Data−
Pin 3 Data+
Pin 4 Ground

Universal Serial Bus (USB) is an industry staundart developed in the mid-1990s that defines the cables, connectors an communications protocols uised in a bus for connection, communication, an pouer supply atween computers an electronic devices.[2]

References[eedit | eedit soorce]

  1. 1.0 1.1 "USB ‘A’ Plug Form Factor Revision 1.0" (PDF). USB Implementers Forum. 23 March 2005. p. 1. Retrieved 4 April 2012. "Body length is fully 12mm in width by 4.5mm in height with no deviations" 
  2. USB deserves more support, "Business", Boston Globe Online (Simson), 1995-12-31, retrieved 2011-12-12