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What is VGA? How does it works?

Although it would be a few years before IBM released another formal video standard, other video card manufacturers quickly began producing cards that could support higher resolutions and color depths than IBM’s VGA standard. These various capabilities were informally called "Super VGA" modes, which over time came to mean "anything better than 640 x 480 at 16 colors." (Eventually, the Video Electronics Standards Association (VESA) helped consolidate these disparate standards and produced a "Super VGA" standard programming interface that included, among other things, a defined 800 x 600 at 16 colors resolution.)

IBM’s next standard of note was called "XGA", which offered a maximum resolution of 1024 x 768 with 256 colors. It could also produce 640 x 480 resolutions with what was at the time a stunning 65,536 colors.

Since that time, continued improvements in technology have pushed resolutions higher and higher, with increasing color depths. Along with these improvements has come a slew of acronyms to define them, which are shown in the table below. In practice, most of these acronyms are rarely used, and the terms "VGA" and "Super VGA" (or "SVGA") are used instead.

So why does a cable company worry about different video standards? Well, as one would expect, higher resolutions and color depths mean more data going through a cable. In fact, the original VGA cables used when IBM developed the VGA standard are no longer appropriate for modern resolutions. Most of us in the cable industry are careful to differentiate between the informal terms "VGA cable" and "SVGA cable," which have physically different constructions.

A traditional VGA cable was fairly simple. It consisted of 14 or 15 28 AWG (28 gauge) wires in a jacket, with 15 pin connectors on either end. These cables, still in use today on older equipment, are suitable for the relatively low resolutions of the original VGA standard. However, it quickly became clear, as resolutions were increased, that a new cable design was going to be necessary. Recognizing that the most critical data flowing through the cable is the red, green, and blue color data, super VGA cables (which are sometimes marketed as "XGA cables") were designed to minimize any interference from compromising the signal along those lines. Rather than just using a pair of wires (one for signal, one for ground) for each color channel – as had previously been done with traditional VGA cables – the newer SVGA cables were designed with three miniature coaxial wires inside the main cable. (Coax cable is a broad term referring to any cable that has a center pin delivering data, surrounded by insulating material and one or more shields that provide grounding and mitigate external interference.) Well-constructed SVGA cables are cable of carrying high resolutions (up to 2048 x 1536) at distances up to 100 feet without external amplification.

When purchasing these cables, you should always take care to purchase Super VGA cables, not standard VGA cables, unless you know for absolute certainty that you will only ever run a low-resolution device. Even then, it is probably advisable to stick with Super VGA cables, to ensure that the cable you purchase today will continue to work into the future.

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As a service to our many customers, www.worldofcables.com is publishing a monthly series of informative technical articles, with each one focusing on a particular technology. Our goal is to help our customers get better acquainted with the often confusing cables, connectors, and standards to be encountered out there. Tell us what you think of this article! We value your feedback. Reply back to Pradeep@worldofcables.com and give us your thoughts.

About the Author

Pradeep is associated with Worldofcables, LLC – a California based company, for consultation or business inquiry, Pradeep can be contacted at: Pradeep@worldofcables.com or visit www.worldofcables.com

small clear blisters?

i have theses small clear "blisters"on the insides of my hands, and on the side of my thumb they itch like no tomorrow til i open them then a thin clear liquid comes out, then they're sore for a day then they start again somewhere else like between my fingers they are the size of a pin tip or the biggest is the head of a strait pin( like u use to pin a pattern to material to sew) The only thing i can figure is i have been exposed to fiber glass via a "friend" how do i get these blisters to stop forming and itching???
For lack of a better word i call them "Water Blisters" HELP GOING NNUTS ITCHING
I never leave the the property and hardly off the porch, on hands only about 1-2 weeks had these could it be contact demititus from fiber glass??

Hi, My sister and I have what sounds the same as you. They are tiny little pinpoint water filled blisters, sometimes in clusters, sometimes alone, on the palms of my hands and usually come in clusters on the sides of my thumbs. After a few days, they turn brown, then a few days later they peel off. Sometimes they itch, sometimes not. We have been trying to figure out what they are for a long time, even the dermatologist I asked had no idea and told me to try some type of cream, which didn't work. But, as I was searching the questions & answers section, I came across a very informative answer to a similar question and thought I would share what he thought they were. He said he was a pediatrician. Try doing a search on the net for palmoplantar pustulosis and see if that helps, although it seems there is no definitive treatment from what I have read so far. Still doing research myself.

100G Hits the Ground Running
With a significant rollout starting in the data center and the first deployments of 100-Gbit/s transport in the long-haul network, 2010 is the year for 100G. Over the past eight years, many companies have made major investments in 40-Gbit/s technology with relatively little return, but with an eye on 100G. For some, that investment will now deliver a return, as 100G takes over for 40G as the ...

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