About dvi connectors




Дата канвертавання18.04.2016
Памер15.12 Kb.
http://www.ramelectronics.net/html/DVI_monitor_cables.html

About DVI:

DVI is the new interface for Digital flat panel LCD monitors and video cards. There are a number of versions of DVI, including DVI-I (analog & Digital together) , DVI-D (only the Digital signal) and DVI-A (only the Analog signal) . Why was DVI created? Wasn't DFP enough? Well here's the history. The P&D or Plug and Display standard, which was ratified by the Video Electronics Standards Association in 1997, tried throwing everything into one connector including Digital and analog interfaces, USB and FireWire, all on one connector. This was very expensive and considered more than was necessary especially for monitor and video card manufacturers. DFP on the other hand eliminated all this excess and has only a Digital interface for Flat panal displays. The reason DFP isn't still being used is its maximum supported resolution is "SXGA", or 1280 x 1024 pixels. This will not be enough for a future filled with HDTV, which has a resolution of 1920 x 1080 pixels.



About DVI connectors


A DVI connection can be one of three types - DVI-I, DVI-D or DVI-A.

DVI-I:


DVI-I contains both the digital and analog connections, (DVI-D + DVI-A) , it's essentially a combination of DVI-D and DVI-A cables within one cable.

DVI-D:


DVI-D (like DFP or P&D-D (EVC)) is a digital only connection. If both devices being connected support a Digital DVI connection (DVI-I or DVI-D compatible) and are compatible in resolutions, refresh rates and sync, using a DVI-D cable will ensure that you are using a digital connection rather than an analog connection, without playing around with settings to assure this.

DVI-A:


DVI-A is really rare. Why use a DVI connector when you can use a cheaper VGA connector? see DVI-I P&D-A (EVC) is more common with projectors, and you should go to your projector manufacturer for recommendations.

Dual Link: Dual T.D.M.S. (transition minimized differential signaling) "links". DVI can have up to two TMDS links. Each link has three data channels for RGB information with a maximum bandwidth of 165 MHz, which is equal to 165 million pixels per second. Dual-link connections provide bandwidth for resolutions up to 2048 x 1536p.

Single Link: Single T.D.M.S. link. Each link has three data channels for RGB information with a maximum bandwidth of 165 MHz, which is equal to 165 million pixels per second.

Bandwidth for a single-link connection supports resolutions of over 1920 x 1080 at 60 Hz (HDTV).

Dual link vs Single Link: Don't believe the "hype" some websites are using about dual link cables being superior to single link cables. A single link cable is 100% as good as a dual link cable for single link equipment which covers about 99.5% of current equipment, including HDTV's, Projectors, Plasma Screens, and High Definition Set top Boxes. A better quality cable is a better quality cable, and single and dual link has nothing to do with quality. On the other hand, if both devices being connected support Dual links, then a dual link cable is the proper cable for the application, and you will have the capability of much greater resolutions and refresh rates. A properly designed Dual link cable should have no negative effects when used with single link equipment.

This is a DVI-I "Dual Link" or "Single Link" female connector. This should work with DVI-I, DVI-A or DVI-D devices with "Dual Link" or "Single Link" connections. If both devices use this connector, use a "Dual Link" connector.



DVI-D Connector



You must use a DVI-D cable.

DVI Connector Pictures

DVI-I (Digital and Analog)

DVI-I Dual Link
(notice the three rows of eight pins and that the "flat blade" contact seen to the left has two contacts above and below it)

DVI-I Single Link
(notice the three rows have two missing pins in the center and that the "flat blade" contact seen to the left has two contacts above and below it)


DVI-I can possibly connect to DVI-I, DVI-A, DVI-D or DFP.


DVI-I will connect to DVI-I, DVI-A, DVI-D or DFP

DVI-D (Digital only)

DVI-D Dual Link
(notice the three rows of eight pins and that the "flat blade" contact seen to the left has no contacts above and below it)

DVI-D Single Link
(notice the three rows have two missing pins in the center and that the "flat blade" contact seen to the left has no contacts above and below it)


DVI-D will connect to DVI-I, DVI-D or DFP.


DVI-D will connect to DVI-I, DVI-D or DFP.

DVI-A and VGA (Analog only)

DVI-A
Notice the three rows of eight pins have three pins missing in the first row, five missing in the second row and four missing in the third row, and that the "flat blade" contact seen to the left has two contacts above and below it. There is no single or Dual link in analog cables.

VGA
Standard "HD15" VGA (SVGA/XGA/SXGA/UXGA) connector for a regular analog monitor.


DVI-A can be connected to either DVI-I or VGA


VGA can be connected to either DVI-I or DVI-A

ADC (ADC - Digital and Analog, sometimes Digital only)





ADC Male
Used for Apple Computers and Display cables

ADC Female
Used on Apple Computers and Display cables

P&D and DFP (P&D - Digital and Analog, DFP - Digital only)

P&D (EVC)
(notice the the three rows of ten pins, rather than eight. The connector is 1 1/4" wide at its widest point.) The analog version and digital version of the connector have different shapes.

P&D (EVC) connector (Analog version)

DFP (MDR-20)
The contacts are completely different in a DFP cable, they are on a center "tongue" like a "Centronics" printer cable.The "D" shape of the connector is more pronounced. The connector is 11/16" at its widest point.


P&D (EVC) connector (Digital version)
P&D can connect to DVI-D, DVI-I, DVI-A, DFP and VGA, depending on which version you have.


DFP will connect to DVI-I, DVI-D or P&D


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