When you look at your various DVI connectors it can be quite confusing. For instance if you look at the plugs and the sockets they can appear very different. We would normally expect a plug to have the same number of pins as the socket has holes; it is what we are used to. But with a dvi cable it is entirely different. Some connectors have sixteen sockets arranged in groups of 4, 8 and 4 with a little slit between one of the 4 groups, some have 21 holes and a slit, and some have 18 holes and a slit.
The reason for this variety is that when the DVI standard was implemented it was decided that is must be possible for the same cables to transmit both digital and analogue signals. In order to achieve this, a variety of interfaces were developed. These are:
* DVI-A. This interface only transmits analogue signals, there are no digital connections.
* DVI-I. The DVI-I interface will transmit a combination of digital and analogue data.
* DVI-D. This is only for digital data.
The designs are as they are because it was decided that the DVI interface would be compatible with a VGA interface (for instance if you had a VGA connector on one end of the cable and a DVI connector on the other end only analogue signals would be transmitted). By supporting both the analogue and digital signals it means that the user can plug the display into the computer and it will work whether it is analogue or digital. This system was introduced as it was realised that there would be a gradual transition between DVI and AVG and this system would make the transition much smoother.
Depending on the mixture of your equipment there is a variety of DVI cables to choose between. For instance if you have a DVI output on your computer and a VGA connection on your CRT monitor then you will need a DVI to VGA monitor cable. Alternatively you may need a DVI-I analogue and digital monitor cable, or a DVI-D single or duel link monitor cable.
Author : David Salt
Article Source: http://www.ArticleStreet.com/
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