StarTech.com DVI to VGA Cable Adapter - DVI (M) to VGA (F) - 1 Pack - Male DVI to Female VGA (DVIVGAMF)
About this deal
DVI is the only widespread video standard that includes analog and digital transmission in the same connector.  Competing standards are exclusively digital: these include a system using low-voltage differential signaling ( LVDS), known by its proprietary names FPD-Link (flat-panel display) and FLATLINK; and its successors, the LVDS Display Interface (LDI) and OpenLDI. DVI's digital video transmission format is based on panelLink, a serial format developed by Silicon Image that utilizes a high-speed serial link called transition minimized differential signaling (TMDS).
Manchester, Gary (October 7, 1996). "Molex PnD intellectual property letter" (PDF). Archived from the original (PDF) on February 22, 2003. When DVI was designed, most computer monitors were still of the cathode ray tube type that require analog video synchronization signals. The timing of the digital synchronization signals matches the equivalent analog ones, so the process of transforming DVI to and from an analog signal does not require extra (high-speed) memory, expensive at the time.
Single Link and Dual Link
Eiden, Hermann (July 7, 1999). "TFT Guide Part 3 - Digital Interfaces". TomsHardware.com . Retrieved 29 March 2012. High-Definition Multimedia Interface (HDMI), a forward-compatible standard that also includes digital audio transmission
Some DVI-D sources use non-standard extensions to output HDMI signals including audio (e.g. ATI 3000-series and NVIDIA GTX 200-series).  Some multimedia displays use a DVI to HDMI adapter to input the HDMI signal with audio. Exact capabilities vary by video card specifications. Docter, Quentin; Dulaney, Emmett; Skandier, Toby (2012). CompTIA A+ Complete Deluxe Study Guide: Exams 220-801 and 220-802. Indianapolis, Indiana: John Wiley & Sons, Inc. ISBN 978-1118324066.DisplayPort (a license-free standard proposed by VESA to succeed DVI that has optional DRM mechanisms) / Mini DisplayPort Because P&D was a physically large, expensive connector, a consortium of companies developed the DFP standard (1999), which was focused solely on digital video transmission using a 20-pin micro ribbon connector and omitted the analog video and data capabilities of P&D.  :3  :4 DVI instead chose to strip just the data functions from P&D, using a 29-pin MicroCross connector to carry digital and analog video.  Critically, DVI allows dual-link TMDS signals,  meaning it supports higher resolutions than the single-link P&D and DFP connectors, which led to its successful adoption as an industry standard. Compatibility of DVI with P&D and DFP is accomplished typically through passive adapters that provide appropriate physical interfaces, as all three standards use the same DDC/EDID handshaking protocols and TMDS digital video signals.  :§1.3.7 Technical overview [ edit ]
If a depth greater than 24 bits per pixel is desired, the least significant bits are sent on the second link.
Uses for DVI
DVI-I is the integrated format connector. It works with digital and analog equipment, acting as a DVI-D or DVI-A cable, but it won't convert pure DVI-D output to analog. DVI-I has two variations—single-link and dual-link—and has a 29-pin layout to accommodate multiple connections. The DVI specification includes signaling for reducing power consumption. Similar to the analog VESA display power management signaling (DPMS) standard, a connected device can turn a monitor off when the connected device is powered down, or programmatically if the display controller of the device supports it. Devices with this capability can also attain Energy Star certification.