Universal Serial Bus - Revision history

CityK: fixed link

2008-01-06T22:14:21Z

fixed link

← Older revision		Revision as of 22:14, 6 January 2008
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	This older Universal Serial Bus variant specifies data transfer rates of 1.5 Mbps (Low-Speed devices) and 12 Mbps (Full-Speed devices).		This older Universal Serial Bus variant specifies data transfer rates of 1.5 Mbps (Low-Speed devices) and 12 Mbps (Full-Speed devices).

-	USB DVB devices adhering to the USB 1.1 standard will operate at the Full-Speed specification. However, because Full-Speed devices are limited to a overall datarate (incl. Protocol overhead) of about 12 Mbps, this essentially prevents these devices from receiving [[HDTV]] steams and makes it impossible to receive some high-datarate services. Only High-Speed USB 2.0 DVB devices are able to transfer the full [[~~MPEG2~~ Transport Stream]] or high-datarate [[Transponder]]s.	+	USB DVB devices adhering to the USB 1.1 standard will operate at the Full-Speed specification. However, because Full-Speed devices are limited to a overall datarate (incl. Protocol overhead) of about 12 Mbps, this essentially prevents these devices from receiving [[HDTV]] steams and makes it impossible to receive some high-datarate services. Only High-Speed USB 2.0 DVB devices are able to transfer the full [[MPEG-2 Transport Stream]] or high-datarate [[Transponder]]s.

CityK: fixed link

2007-08-11T15:44:29Z

fixed link

← Older revision		Revision as of 15:44, 11 August 2007
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-	Many USB DVB devices are available from an wide assortment of different [[~~DVB receiver vendors~~\|vendors]].	+	Many USB DVB devices are available from an wide assortment of different [[List of Device Vendors\|vendors]].

CityK: fixed link

2007-06-17T16:37:25Z

fixed link

← Older revision		Revision as of 16:37, 17 June 2007
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-	Many USB DVB devices are available from an wide assortment of different [[DVB ~~Card Vendors~~\|vendors]].	+	Many USB DVB devices are available from an wide assortment of different [[DVB receiver vendors\|vendors]].

CityK: Doh!...double colon

2007-03-10T01:57:13Z

Doh!...double colon

← Older revision		Revision as of 01:57, 10 March 2007
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	The '''Universal Serial Bus''' ('''USB''') is 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. 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.		The '''Universal Serial Bus''' ('''USB''') is 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. 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 on http:://www.usb.org.	+	Governed by the USB Consortium, USB specifications are openly available to the public on [http://www.usb.org usb.org].

CityK: I have no idea why this usb.org link is not working ... anyway

2007-03-10T01:56:09Z

I have no idea why this usb.org link is not working ... anyway

← Older revision		Revision as of 01:56, 10 March 2007
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	The '''Universal Serial Bus''' ('''USB''') is 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. 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.		The '''Universal Serial Bus''' ('''USB''') is 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. 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 on [http:://www.usb.org].	+	Governed by the USB Consortium, USB specifications are openly available to the public on http:://www.usb.org.

CityK at 01:55, 10 March 2007

2007-03-10T01:55:20Z

← Older revision		Revision as of 01:55, 10 March 2007
Line 1:		Line 1:
	The '''Universal Serial Bus''' ('''USB''') is 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. 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.		The '''Universal Serial Bus''' ('''USB''') is 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. 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 on [[http:://www.usb.org]].	+	Governed by the USB Consortium, USB specifications are openly available to the public on [http:://www.usb.org].

CityK at 01:54, 10 March 2007

2007-03-10T01:54:54Z

← Older revision		Revision as of 01:54, 10 March 2007
Line 1:		Line 1:
	The '''Universal Serial Bus''' ('''USB''') is 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. 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.		The '''Universal Serial Bus''' ('''USB''') is 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. 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 on http:://www.usb.org/.	+	Governed by the USB Consortium, USB specifications are openly available to the public on [[http:://www.usb.org]].


-	Many USB DVB devices are available from an wide assortment of different [[DVB Card Vendors\|vendors]],	+	Many USB DVB devices are available from an wide assortment of different [[DVB Card Vendors\|vendors]].

CityK: wording etc

2007-03-10T01:48:52Z

wording etc

← Older revision		Revision as of 01:48, 10 March 2007
Line 1:		Line 1:
	The '''Universal Serial Bus''' ('''USB''') is 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. 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.		The '''Universal Serial Bus''' ('''USB''') is 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. 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.

-	~~Specified~~ by the USB Consortium, ~~spec is publicly~~ available on http:://www.usb.org/.	+	Governed by the USB Consortium, USB specifications are openly available to the public on http:://www.usb.org/.


Line 8:		Line 8:

	===USB 1.1===		===USB 1.1===
-	~~The~~ older Universal Serial Bus variant ~~that~~ specifies data transfer rates of 1.5 Mbps (Low-Speed devices) and 12 Mbps (Full-Speed devices).	+	This older Universal Serial Bus variant specifies data transfer rates of 1.5 Mbps (Low-Speed devices) and 12 Mbps (Full-Speed devices).

-	~~Used~~ at Full-Speed ~~by some USB DVB devices~~. ~~Because~~ Full-Speed devices are limited to a overall datarate (incl. Protocol overhead) of about ~~12Mbps~~, this essentially prevents ~~the reception of~~ [[HDTV]] steams and makes it impossible to receive some high-datarate services. Only High-Speed ~~USB2~~.0 devices are able to transfer the full [[MPEG2 Transport Stream]] or high-datarate [[Transponder]]s.	+	USB DVB devices adhering to the USB 1.1 standard will operate at the Full-Speed specification. However, because Full-Speed devices are limited to a overall datarate (incl. Protocol overhead) of about 12 Mbps, this essentially prevents these devices from receiving [[HDTV]] steams and makes it impossible to receive some high-datarate services. Only High-Speed USB 2.0 DVB devices are able to transfer the full [[MPEG2 Transport Stream]] or high-datarate [[Transponder]]s.


	===USB 2.0===		===USB 2.0===
-	In terms of reception of digital TV services, the ~~480Mbps~~ transfer rate of USB 2.0 overcomes several of the limitations of earlier USB 1.1 devices.	+	In terms of reception of digital TV (DTV) services, the 480 Mbps transfer rate of USB 2.0 overcomes several of the limitations of earlier USB 1.1 devices.

CityK at 04:25, 26 February 2007

2007-02-26T04:25:10Z

← Older revision		Revision as of 04:25, 26 February 2007
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	===USB 2.0===		===USB 2.0===
-	In terms of reception of digital TV services, the ~~480MBit~~ transfer rate of USB 2.0 overcomes several of the limitations of earlier USB 1.1 devices.	+	In terms of reception of digital TV services, the 480Mbps transfer rate of USB 2.0 overcomes several of the limitations of earlier USB 1.1 devices.

CityK: just rewording and arrangement

2007-02-26T04:24:20Z

just rewording and arrangement

← Older revision		Revision as of 04:24, 26 February 2007
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-	The '''Universal Serial Bus''' (~~short~~ '''USB''') is 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. Since devices are defined as dumb clients that get polled by the USB Host Controller ~~the~~ USB device chipsets can ~~get~~ very cheap compared to [[IEEE1394]] chips ~~providing~~ the same functionality.	+	The '''Universal Serial Bus''' ('''USB''') is 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. 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.

	Specified by the USB Consortium, spec is publicly available on http:://www.usb.org/.		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 [[Transponder]]s, Full-Speed are limited to a overall datarate (incl. Protocol overhead) of about 12MBit.	+
		+	Many USB DVB devices are available from an wide assortment of different [[DVB Card Vendors\|vendors]],
		+

	===USB 1.1===		===USB 1.1===
-	The older [[Universal Serial Bus]] variant that specifies 1.~~5MBit~~ (Low-Speed) and ~~12MBit~~ (Full-Speed) ~~Transfers~~. Used at Full-Speed by some USB DVB devices. ~~The limitation~~ to ~~12MBit forbids~~ [[HDTV]] ~~receiption~~ and makes it impossible to receive some high-datarate services. ~~The 480MBit [[~~USB2.0]] ~~variant overcomes these limitations~~.	+	The older Universal Serial Bus variant that specifies data transfer rates of 1.5 Mbps (Low-Speed devices) and 12 Mbps (Full-Speed devices).
		+
		+	Used at Full-Speed by some USB DVB devices. Because Full-Speed devices are limited to a overall datarate (incl. Protocol overhead) of about 12Mbps, this essentially prevents the reception of [[HDTV]] steams and makes it impossible to receive some high-datarate services. Only High-Speed USB2.0 devices are able to transfer the full [[MPEG2 Transport Stream]] or high-datarate [[Transponder]]s.


	===USB 2.0===		===USB 2.0===
		+	In terms of reception of digital TV services, the 480MBit transfer rate of USB 2.0 overcomes several of the limitations of earlier USB 1.1 devices.


-	== Links ==	+	==External Links==
	*http://www.usb.org/		*http://www.usb.org/
	*[[wikipedia:USB]]		*[[wikipedia:USB]]

	[[Category:Technology]]		[[Category:Technology]]