The DVI standard is based on transition-minimized differential signaling (TMDS). There are two DVI formats: single-link and dual-link. Single-link cables use one TMDS-165 MHz transmitter, and dual-link cables use two. The dual-link cables double the power of the transmission. A single-link cable can transmit a resolution of 1920 x 1200 vs. 2560 x 1600 for a dual-link cable.
Several types of DVI connectors are available, most commonly:
DVI-D, a digital-only connector for use between a digital video source and monitors. DVI-D eliminates the analog pins.
DVI-I (integrated), which supports both digital and analog RGB connections. It can transmit either a digital-to-digital signal or an analog-to-analog signal. It is used on products instead of separate analog and digital connectors. If both connectors are DVI-I, you can use any DVI cable, but a DVI-I is recommended. (NOTE: For a DVI-I to DVI-D display converter, click here).
DVI-A (analog), which is used to carry a DVI analog signal from a computer to an analog VGA device, such as a monitor. If one or both of your connections are DVI-A, use this cable. If one connection is DVI and the other is VGA HD15, you need a cable or adapter with both connectors as long as you don’t require an active analog/digital connector.
HDMI (High-Definition Multimedia Interface) was the first digital interface to combine uncompressed HD video, up to eight channels of uncompressed digital audio, and intelligent format and command data in a single cable. It is now the defacto standard for consumer electronics and HD video, although it is beginning to face competition from the newer DisplayPort interface.
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