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USB

Different USB Types

  • USB 1.0: This Universal Serial Bus (USB) standard offers a fast master/slave interface in star topology with a maximum of 127 devices. Each cable section is 5 metres (with up to 6 hubs, max. 30m distance). Low-speed 1.5 Mbit/s and full-speed 12 Mbit/s, 5V 500mA of power (limited to 100mA during startup) are possible.
  • USB 2.0: The 2.0 specification is the addition of a high-speed 480 Mbit/s data transfer mode.
  • USB 3.0: The 3.0 standard is backward compatible with USB 2.0, but can deliver more power (900mA). In also adds a super-speed >4.8 Gbit/s data transfer rate.
  • Wireless USB: This specification is a short-range, high-speed radio communication protocol (480 Mbit/s up to 3 m and 110 Mbit/s up to 10 m).
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USB 1.0 and USB 2.0 use a cable with 4 wires (Vbus, Gnd, D+ and D-). USB 3.0 requires 8 wires (Vbus, Gnd, D+ and D-, SSrx- + SSrx+, SStx- + SStx+). To detect and accelerate a device, the device applies 3V (1.5KOhm pulse-up resistance) to the D wire (low speed) or to the D+wire (full speed/high speed require more information/handshake on the D+ wire).

Manufacturers & Contacts

APAC OPTO

APAC OPTO ELECTRONICS is the leading manufacturer of high performance fiber optical transmission components for Local Area Networks (LANs), Wide Area Networks (WANs), Storage Networks (SANs), Metropolitan Area Networks (MANs) and Access Networks (ANs) in Taiwan.

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