Universal Serial Bus

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The Universal Serial Bus (USB) is a serial four-wire bus (ground, power, and a differential data signal transferred over two wires). A quite clever designed protocol for communication between the PC Host and peripheral devices like (e.g. DVB receivers). Since devices are defined as dumb clients that get polled by the USB Host Controller, USB device chipsets can be very cheap compared to IEEE1394 chips that provide essentially the same functionality.

Governed by the USB Consortium, USB specifications are openly available to the public at USB.org.


USB 1.1

This older Universal Serial Bus variant specifies data transfer rates of 1.5 Mbit/s (Low-Speed devices) and 12 Mbit/s (Full-Speed devices).


USB 2.0

In terms of reception of digital TV (DTV) services, the 480 Mbit/s transfer rate of USB 2.0 overcomes several of the limitations of earlier USB 1.1 devices.

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