Work of a DVI Cable

A DVI cable usually contains pins to pass the DVI-native digital video signals. In the case dual-link systems, additional pins are provided for the second set of data signals. Digital Visual Interface is a video interface standard designed to provide very high visual quality on digital display devices such as flat panel LCD computer displays and digital projectors.  As well as digital signals, the DVI cable includes pins providing the same analog signals found on a VGA connector, allowing a VGA monitor to be connected with a simple plug adapter. 

The DVI cable on a device is therefore given one of four names, depending on which signals it implements. They are DVI-D, only for digital, DVI-D, only for analog only, DVI-I, integrated, digital and analog and the last one of the DVI cable is M1-DA, which is integrated, digital, analog and USB. The DVI cable also includes provision for a second data link for high resolution displays, though many devices do not implement this. In those that do, the cable is sometimes referred to as DVI-DL which is called as Dual link.

The long flat pin on a DVI-I cable is wider than the same pin on a DVI-D cable, so it is not possible to connect male DVI-I to a female DVI-D by removing the 4 analog pins.  These features show that they made DVI cable as universal. This cable plays a major role and is an important one too.