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DVI-D and DVI-I
The DVI connector usually contains pins to pass the DVI-native digital video signals. In the case of dual link systems, additional pins are provided for the second set of data signals.
Dual link should not be confused with dual display (also called dual head), which describes those situations where a computer is hooked up to two monitors at once. Neither, either or both of the dual displays could be dual link. Depending on the video card(s), the displays could be both analog (VGA), an analog and a digital, or both digital.
As well as digital signals, the DVI connector includes pins providing the same analog signals found on a VGA connector, allowing an analog VGA monitor to be connected with a passive plug adapter (or with a converter cable with VGA at one end, and DVI-A or DVI-I at the other). This feature was included in order to make DVI universal, as it allows either type of monitor (analog or digital) to be operated from the same connector.
The DVI connector on a device is therefore given one of three names, depending on which signals it implements:
- DVI-D (digital only, both single-link and dual-link)
- DVI-A (analog only)
- DVI-I (integrated - digital and analog)
The DVI-D and DVI-I connector includes provision for a second data link, but few devices implement this. In those that do, the connector is sometimes referred to as DVI-DL (dual link).
Source: Wikipedia
