Editing Digital Visual Interface (section)

===Analog===
The analog section of the DVI specification document is brief and points to other specifications like VESA VSIS<ref>Video Signal Standard (VSIS) Version 1, Rev. 2, available for purchuase at http://www.vesa.org/</ref> for electrical characteristics and [[Generalized Timing Formula|GTFS]] for timing information. The motivation for including analog is to keep compatibility with the previous [[VGA connector|VGA cables and connectors]]. VGA pins for HSync, Vsync and three video channels are available in both DVI-I or DVI-A (but not DVI-D) connectors and are electrically compatible, while pins for DDC (clock and data) and 5 V power and ground are kept in all DVI connectors. Thus, a passive adapter can interface between DVI-I or DVI-A (but not DVI-D) and VGA connectors.