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Because most CRT monitors require the signal information in analog (continuous electrical signals or waves) form and not digital (pulses equivalent to the binary digits 0 and 1), they typically use an analog connection. Once the display information is in analog form, it is sent to the monitor through a VGA cable. You can see that a VGA connector like this has three separate lines for the red, green and blue color signals, and two lines for horizontal and vertical sync signals. Because a VGA (analog) connector does not support the use of digital monitors, the Digital Video Interface (DVI) standard was developed. The DVI specification is based on Silicon Image's Transition Minimized Differential Signaling (TMDS) and provides a high-speed digital interface. DVI cables can be a single link cable that uses one TMDS transmitter or a dual link cable with two transmitters. DVI-D connectors carry a digital-only signal and DVI-I adds four pins for analog capability. If you buy a monitor with only a DVI (digital) connection, make sure that you have a video adapter with a DVI-D or DVI-I connection. Digital Visual Interface (DVI) este o conexiune digitala folosita pentru a conecta un computer la proiectoare, monitoare, sau alte device-uri care suporta acest tip de conexiune.

Este compatibil atat cu standardul HDMI (High-Definition Multimedia Interface) prin conectorul DVI-D cat si cu standardul VGA prin conectorul DVI-A. Lungimea maxima a unui cablu DVI depinde de tipul de cablu care transporta acest semnal si de ce semnal se doreste a fi transportat.
Please Note: This product is intended for connections between DVI-I (29 pin) and VGA devices. In a normal television, all of these signals are combined into a single composite video signal. A transmitter on the video adapter sends the digital information to a receiver in the monitor. Both connectors can be used with a single-link or a dual-link cable, depending upon the requirements of the display.
If your video adapter has only an analog (VGA) connection, look for a monitor that supports the analog format. Conexiunea DVI transporta doar video, spre deosebire de conexiunea HDMI care transporta atat video cat si audio. A video adapter is an expansion card or component that provides the ability to convert display information into a signal that is sent to the monitor.

The separation of the signals is one reason why a computer monitor can have so many more pixels than a TV set. TMDS takes the signal from the video adapter, determines the resolution and refresh rate that the monitor is using, and spreads the signal out over the available bandwidth to optimize the data transfer from computer to monitor. Insa daca se doreste transportul unui semnal 1080p (1920 x 1200) cablul nu trebuie sa depaseasca 4,5 m (in teorie) insa daca transportati semnalul cu un cablu de calitate, se poate ajunge si la 10 m fara a avea pierderi.
Is there a cable (preferably in expensive) that will convert my DVI-I (digital only) signal to a VGA (analog) signal? However, analog signal processing technology has improved over the years and the difference in quality is now minimal. DVI-D connector is missing those pins so a simple adapter will not work as the analog signal is missing.

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