Dual DVI is a digital visual interface connector with 24 pins, allowing for higher graphic display resolution and longer cable lengths. It can carry both digital and analog signals and was designed to replace VGA connectors.
Dual DVI is a Digital Visual Interface connector that contains 24 pins arranged in a rectangular grid-like format on the right side. This is not to be confused with a dual display DVI, which contains two connectors. Dual DVI is also known as Dual-Link and is available as a connector on a cable or on an electronic device such as a personal computer (PC) or high definition television (HDTV).
The Digital Visual Interface, also known as the Digital Video Interface, debuted in 1999. It was designed by the Digital Display Working Group (DDWG). It is an open industry consortium founded by seven consumer electronics companies: Intel® Corp., Fujitsu Ltd., International Business Machines Corp. (IBM®), Hewlett-Packard Company (HP®), NEC Corp., Silicon Image ®, Inc and Compaq Computer Corp., which merged with HP® two years later.
DVI was supposed to replace the Video Graphics Array (VGA) connector. VGA was – and as of 2011 still is – commonly used to connect monitors to desktop PCs or as an external display connector to laptop PCs. In contrast to VGA, which transmits analog video signals, the appropriately named DVI is used for digital visual displays.
Dual DVI pins are responsible for passing digital video signals. Dual DVI has six more pins than Single DVI or Single-Link DVI; the number of pins in a single-link connector is 18. The additional pins on the dual-link connector increase bandwidth, which is the range of frequencies needed to transmit video signals.
As a result, Dual-Link DVI allows for higher graphic display resolution than Single-Link DVI. Graphic display resolution indicates the number of pixels that can fit on the display screen. Single DVI can handle up to 1,920 by 1,200 pixels of resolution. Dual DVI surpasses that with a maximum display quality of 2,560 by 1,600 pixels.
Another result of the increased bandwidth of Dual-Link DVI is the ability of signals to travel greater distances than Single DVI. The maximum cable length standard established for DVI cables is approximately 16 feet (5 m). Some manufacturers, however, carry Dual DVI cables up to 25 feet (about 8m) long.
The dual DVI connectors, however, can carry more than just digital video signals. They can also accommodate analog singles, the same ones that carry VGA connectors. Therefore, there are two types of Dual-Link connectors: DVI-Integrated (DVI-I) and DVI-Digital (DVI-D). DVI-I contains digital and analog video pins to accommodate both types of computer monitors. DVI-D, on the other hand, is exclusively for digital visual displays.
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