igital (V)ideo




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http://www.datapro.net/dvi.html

The DVI specification has created an uniform connector that can accommodate both, digital and analog video signal. DVI has three subsets: DVI-A, for analog signals, DVI-D, for digital signals, and DVI-I (integrated), for both analog and digital signals.



Digital Visual Interface (DVI) is the standard interface for a high-performance connection between PCs and flat panel displays, digital CRT displays, projectors, and HDTV. DVI-D Digital Cables deliver the high-performance, high-bandwidth interface needed for video displays of today while leaving headroom for the products of tomorrow. These precision-engineered cables are fully compliant with the DVI standard defined by DDWG (Digital Display Working Group). The DVD-D dual link configuration provides enough bandwidth for resolutions up to 2048 x 1536 and allows high speed digital transmission up to 9.9 Gbps.



  • Connectors: DVI-D Dual-Link 24-pin Male to DVI-D Dual Link 24-pin Male

  • Dual link digital signaling allows for high speed transmission up to 9.9Gbps

  • Shielded undermold protects against unwanted EMI/RFI interference

  • 28AWG copper conductors

  • Double Shielded

  • Gold-plated contacts provide full conductivity with no data loss

  • Supports hot plugging of DVI display devices

  • PC and Mac compatible

  • Resolutions up to 2048 x 1536

  • Supports digital signal only

  • Compatible with Flat Panel Displays, Digital CRT Displays, Projectors, and HDTV

  • PC99 color-coded: white

WHAT IS DVI ?

DVI stands for (D)igital (V)ideo (I)nterface.


DVI is a new form of video interface technology made to

maximize the quality of flat panel LCD monitors and high-

end video graphics cards. It is a replacement for the P&D

Plug & Display standard, and a step up from the digital-only

DFP format for older flat panels. DVI is becoming increasingly

popular with video card manufacturers, and most cards

purchased include both a VGA and a DVI output port.
In addition to being used as the new computer interface,

DVI is also coming out as the digital transfer method of choice

for HDTV, EDTV, Plasma Display, and other ultra-high-end video

displays for TV, movies, and DVDs. Likewise, even a few of

the top-end DVD players are now featuring DVI outputs in addition

to the high-quality analog Component Video. Don't expect to throw

away all your old video cables just yet, but keep an eye out for

DVI availability in the future.




WHAT ARE THE DVI FORMATS ?


There are three types of DVI connections:


1. DVI-D (Digital)

2. DVI-A (Analog)

3. DVI-I (Integrated Digital/Analog)
DVI-D - True Digital Video
DVI-D format is used for direct digital connections between

source video (namely, video cards) and digital LCD (or rare

CRT) monitors. This provides a faster, higher-quality image

than with analog, due to the nature of the digital format.

All video cards initially produce a digital video signal, which

is converted into analog at the VGA output. The analog signal

travels to the monitor and is re-converted back into a digital

signal. DVI-D eliminates the analog conversion process and

improves the connection between source and display.
DVI-A - High-Res Analog
DVI-A format is used to carry a DVI signal to an analog

display, such as a CRT monitor or an HDTV. Although some

signal quality is lost from the digital to analog conversion, it

still transmits a higher quality picture than standard VGA.


DVI-I - The Best of Both Worlds
DVI-I format is an integrated cable which is capable of

transmitting either a digital-to-digital signal or an

analog-to-analog signal, but it will not work transmitting

a digital-to-analog or analog-to-digital signal.


Like any other format, DVI digital and analog formats are

non-interchangeable. This means that a DVI-D cable will not

work on an analog system, nor a DVI-A on a digital system.

Make sure that you know what format each part of your

equipment is before you purchase any DVI cables.

Only equipment with a DVI port labeled 'DVI-I' will accept both

a DVI-D and DVI-A source signal.


WHAT ARE SINGLE AND DUAL LINKS ?


The Digital formats are available in DVI-D Single-Link and



Dual-Link as well as DVI-I Single-Link and Dual-Link format

connectors. These cables send information using a digital information

format called TMDS (transition minimized differential signaling).

Single link cables use one TMDS 165Mhz transmitter, while dual

links use two. The dual link effectively doubles the power of

transmission and provides an increase of speed and signal quality;

i.e. a single link 60-Hz LCD can display a resolution of 1920 x 1080,

while a dual link can display a resolution of 2048 x 1536.




HOW DO I KNOW WHICH CABLE TO USE?


Determining which type of cable to use for your DVI products is

critical in getting the right product the first time. Check both of

the female DVI plugs to determine what signals they are compatible

with.
Note: To prevent pins being broken off of mistmatched cables,

most manufacturers will make their female plugs with all available pins.

This means that most every female DVI plug will look like a DVI-I, but

this is not necessarily true. Be sure to look for a label, or check the

product documentation to make sure you know what type it is.
If you have plugs that are DVI-D, they will accept a DVI-D or DVI-I

cable. If you have plugs that are DVI-A, they will accept a DVI-A or DVI-I

cable. If you have plugs that are DVI-I, they will accept any type of DVI

cable.
If you have mistmatched plugs, such as DVI-D and DVI-I or DVI-A and

DVI-I, you may use either a DVI-I cable or the cable that matches the other

plug. For example, you may use a DVI-D cable on a DVI-I to DVI-D connection,

but not a DVI-A cable.
Note: You may not mismatch a DVI-D and a DVI-A connection.
It is possible to extend existing DVI cables by the use of DVI-I extension

and DVI-D Extension cables. The maximum signal length, however,

is 5 meters, and going beyond that may result in quality loss.
For a list of common brand-name flat panel displays, projectors, video cards,

and other products, check out the DataPro DVI Product Reference Page.



HOW TO RECOGNIZE A DVI CABLE


There are two variables in every DVI connector cable, and

each represents one characteristic.
The flat pin on one side denotes whether the cable is

digital or analog:

A flat pin with four surrounding pins is either DVI-I or DVI-A

A flat pin alone denotes DVI-D


The pinsets vary depending on whether or not the cable

is single- or dual-link:

A solid 24-pin set (rows of 8) for a dual- link cable

Two separated 9-pin sets (rows of 6) for a single-link cable


NOTE: To distinguish from DVI-I and DVI-A, check the pinset.

A solid 24-pin set is for a DVI-l; a separated 8-pin and 4-pin

set is for DVI-A.




List of DataPro DVI Cables::

1140 DVI-I DIG/ANA Extension Cable (M/F)

1141 DVI-D Single Digital Video Cable

1142 DVI-D Dual Digital Video Cable

1143 DVI-D Single to DFP Digital Video Cable

1144 DVI DFP to DFP Digital Video Cable

1145 DVI-I Analog to VGA/SVGA Video Cable

1145-MFA DVI-I Analog to VGA Adaptor

1147 DVI-I Single Digital & Analog

1148 DVI-I Dual Digital & Analog

1149 DVI-D Dual Digital Video Extension Cable

Written by Anthony van Winkle

for DataPro International Inc.

Unauthorized duplication strictly prohibited.



List of DataPro DVI Cables::

1140 DVI-I DIG/ANA Extension Cable (M/F)

1141 DVI-D Single Digital Video Cable

1142 DVI-D Dual Digital Video Cable

1143 DVI-D Single to DFP Digital Video Cable

1144 DVI DFP to DFP Digital Video Cable

1145 DVI-I Analog to VGA/SVGA Video Cable

1145-MFA DVI-I Analog to VGA Adaptor

1147 DVI-I Single Digital & Analog

1148 DVI-I Dual Digital & Analog

1149 DVI-D Dual Digital Video Extension Cable


DVI-A Dual Analog Video Cable





The 1146 series DVI video cable is

a analog DVI-A to DVI-A video

connection cable. Although the

signal is of an analog nature,

the DVI connectors provide the

maximum quality available on a

non-digital picture.
This cable can be used to carry an

analog signal from a compliant video

card output to an analog compatible

LCD monitor. The connections that work

with this cable are DVI-A and DVI-I.
This cable can not be used to carry

a signal from a DVI-A to DVI-D, or

vice versa.

Both connectors are of type DVI-A.



DataPro P/N 1140-xx:
DVI-I (DIG/ANA) Video Extension Cable





The 1140 series Video Extension

cable is used to extend the length

of any DVI video cable. The dual-

bandwith connectors ensure maximum

quality images while extending the

signal to the desired length. Keep in

mind that, although some devies are

stronger than others, DVI is only

guaranteed to function up to 16 feet.
This is a Male-to-Female type,

with DVI-I connectors on each end:



The DVI-I style connectors on each

end of this cable make it the most

flexible as far as compatibility

with your devices. A DVI-I can link

a DVI-A analog with a DVI-I, or a

DVI-D digital with a DVI-I, or either

a DVI-A to DVI-A or a DVI-D to DVI-D.
However, this cable will not work to

connect a digital device (DVI-D) to an

analog one (DVI-A).


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