Universal Serial Bus
A serial 4-wire bus (GND, Power and a differential Data Signal transferred over 2 wires). A quite clever designed Protocol for communication between the PC Host and peripheral devices like e.g. DVB Receivers.
Specified by the USB Consortium, spec is publicly available on http:://www.usb.org/.
Different USB DVB Devices are available on the Market by different DVB Card Vendors, only High-Speed USB2.0 devices are able to transfer the full MPEG2 transport stream or high-datarate Transponders, Full-Speed are limited to a overall datarate (incl. Protocol overhead) of about 12MBit.