DVI Information - DVI-D Digital Video Interface

If you are looking to connect a source with a digital DVI output to a display with a digital DVI input, such as an HDTV, then you will want to purchase either a single link or a dual link DVI-D cable. Whether you buy single or dual link DVI-D depends primarily on the amount of bandwidth needed for your particular application. Single TMDS link DVI cable can support resolutions and timings that use a video clock rate of about 25-165 MHz. A dual link DVI-D cable, on the other hand, will handle up to 330 MHz and is backwards compatible with single link. Thus if you are unsure which type you need, the dual link will work where the single link may not. In order to determine your required bandwidth just multiply your desired resolution by your desired refresh rate (ie. 1600x1200 x 70 = 134 MHz).

DVI-D Single Link

DVI-D Dual Link

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Other DVI Types

The three different types of DVI are DVI-D, DVI-I, and DVI-A. DVI-D is strictly digital, can support dual link, and contains 24 contacts arranged in three rows of eight. DVI-I has the original 24 digital contacts, as well as five additional contacts to support analog video. DVI-I also supports dual link. DVI-A on the other hand, is only available as a male connector or plug which only mates with the analog contacts of a DVI-I connection. DVI-A is used to convert between DVI and the traditional analog display technology.