Understanding The DVI Connector And Video Cable

A DVI connector can provide a high quality picture for your home cinema components.

However, it may be that there are better ways to connect your devices. Find out more about this connection type and when you should use it.

What does the DVI connector look like?

The connection on your device will look something like this. It is a common port found on modern computer graphics cards and some AV devices such as projectors.

Some manufacturers will colour the port depending on which type of DVI connector it is - DVI-D, DVI-A or DVI-I. See below for more information on the different types.

What does a DVI cable look like?

The cable that is used to connect two devices looks like this.

The 'D' shape means the video cable can only be inserted one way round.

The DVI connection on the end of the cable may have different amounts of pins depending on the type of DVI connection it is designed for. The different pin configurations are explained below.

When should I use a DVI connection?

Most modern AV equipment will usually have an HDMI connector. This can be used to send high quality digital video and audio signals.

However, if you have a device with DVI connections rather than HDMI, then this should be used for sending the video signal if possible.

This type of connection would normally be used ahead of a component video cable, an s-video cable and a composite video signal - as long as your equipment supports this type of hookup.

What else can you tell me about DVI connections?

The acronym stands for Digital Visual Interface.

This connection is mainly used in computers for sending images to screens. However, you may come across them in some AV equipment, especially projectors.

There are actually three types of cables and connections, and each type has a slightly different pin configuration:

• DVI-D - for digital signals
• DVI-A - for analog signals
• DVI-I - can send digital and analog signals

These different types were designed to allow a flexible solution for connecting to either digital or analog screens. However, in reality it can just be plain confusing! In general, most AV equipment will have the digital version.

It is possible to tell the type of port you have/need by checking the pins used on your device connectors - and these are pictured above. However it is probably safer to refer to the manual before you buy a cable to make sure which version you are using. You don't want to buy a digital cable if your outputs only support the analog version!

There is also another less common version - dual link (or DVI-DL). This has a second internal connection for delivering data and can be used for high-resolution displays. This type of connection isn't widely used, but you would need a dual link cable if your device uses this type of interface.

Do I need a converter for DVI to HDMI?

The digital DVI-D or DVI-I version is compatible with an HDMI connection, and so you can get DVI to HDMI cables or converters if your AV equipment requires this type of hookup. Remember, a DVI connection doesn't transfer audio signals and so these cables will send the picture but not the sound.

The cable pictured above will work both ways. So you can send a signal from a DVI output to an HDMI input. Or from an HDMI output to a DVI input.

Terrific!

How do I connect DVI to a VGA monitor?

There may be a time when you have a DVI output, but only a VGA input on your monitor. Do DVI to VGA adapters work? By golly, they do indeed.

If you are using the DVI-I or DVI-A versions, then you can buy an adapter to convert your DVI output into a VGA interface.

Does this work both ways? No, this adapter is designed with a male DVI connection, which plugs into the female DVI output on you device. You can then connect a standard VGA cable into the female VGA connector - and then plug this into your monitor.

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