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What is Proxy server...??

In computer networks, a proxy server is a server (a computer system or an application) that acts as an intermediary for requests from clients seeking resources from other servers. A client connects to the proxy server, requesting some service, such as a file, connection, web page, or other resource available from a different server and the proxy server evaluates the request as a way to simplify and control its complexity. Today, most proxies are web proxies, facilitating access to content on the World Wide Web.

Difference between Lcd and Led. !!!

The Most Important Thing: The Display

The one main important thing to remember though is the display. After all, it will be the centerpiece of your multimedia setup. From playing games to watching movies and shows, your TV is where your eyes will be most of the time once you turn it on.

Checking out televisions for sale at your local shopping mall may be helpful to some degree, since you can see for yourself how accurately the display renders colors and the difference between displays once they’re stacked against each other. Before heading out though, what strikes the buyer is the inevitable choice of buying an LCD TV or LED TV.

Which one between these two types offers better picture quality and which one is the best overall? What offers value for your money and will last longer? It sometimes boils down to one’s preference, and to give you an idea on what you get if you choose to go with an LCD or LED TV, here’s a rundown of some of the major aspects being offered by both.

LED or LCD: It’s The Back Lighting

Technically speaking, an LED TV is also an LCD TV, as the screen on both is a liquid crystal display. An LCD display has two layers of glass that are polarized and joined together, the liquid crystals then pass or block the light to display the television picture.

The crystals do not produce any light as the light comes from a series of lamps at the back of the screen. On an LCD TV, the lamps at the back of the screen are fluorescent lamps, whilst on an LED TV the lights at the back of the screen are Light Emitting Diodes (LED).

There are two types of LED methods used to provide the back lighting to the screen: edge lighting (with or without local dimming) and full array lighting (with or without local dimming).  Majority of LED TVs fall in the edge-lit without local dimming category, with the LEDs placed only along the edge of the LCD panel.

It uses “light guides” to illuminate the center and other areas of the screen. Since its introduction a couple of years ago, manufacturers such as Samsung, LG and Sony have come up with a better version: edge lit with local dimming. This variety results in better picture quality, with the black levels becoming darker, providing a visual feast even for those very discerning viewers.

The Best Choice For Picture Quality

If you want the best in picture quality among LED TVs, technically it will have to be one that has full-array back lighting with local dimming. The individual zones of LEDs can be dimmed or brightened independently, making it more flexible and suitable to an individual’s taste and preference.

Comparing side by side, LED TVs generally have better black levels and contrasts than their LCD counterparts. Color accuracy is also slightly better on an LED TV. While LCD TVs are no slouch on color accuracy, compared to an LED TV, the latter has a slight advantage.

Viewing angle is more or less the same on both as this will depend on the glass panel used by the manufacturer. A thicker and higher quality glass panel is expected to provide a better viewing angle.

The Best Choice For Energy Efficiency

If power consumption is a major concern then what you need is an energy efficient television. LED TVs get the vote here as it is using less light to display its pictures. These are designed to produce a better quality pictures while also using less power than LCD models.

The Best Choice For Price

If the price tag is of major concern, LCD TVs are the obvious choice as their prices have gone down ever since LED TVs started becoming more mainstream.

The Best Choice For Size

In terms of size, LED TVs are slimmer compared to LCD TVs but not by much. LED lights can be installed in smaller places, allowing manufacturers to trim out some unnecessary weight. If space is an issue, better to keep those measuring tapes handy before buying your latest TV set.

The Best Choice For Gaming and Home Theatre

Planning to hook up your game console to your monitor? LCD TVs in the long run are recommended by many as the better choice since heads-up display (HUD) elements in some video games may create ghostly permanent images on the screen when used for a long time. This is what you call burn-in, which is less likely to happen with LCD TVs. Those who have set up a high-end home theater on their PC may also opt for an LCD TV to avoid the same.

Conclusion

Given these pros and cons of both LCD and LED TVs, it’s really up to the buyer to figure out which suits their needs best. Obviously, LED TVs have the more advanced technology, slightly better picture quality (generally speaking), but comes at a higher price point. LCD TVs remain in production despite the gaining popularity of their LED counterparts and this is because they offer good value given at a lower price, doing so with above average picture quality.

Do take note that setting up your new display properly is one of the first things you’ll need to do before going on a movie marathon to get the best results. Even the most advanced TV set can’t produce that stunning picture quality you’re looking for if it’s not set up properly.

This article was updated on the 23rd of December 2011. We also have a new guide on the latest TV technology that will be popular in 2012, OLED TVs, have a look at our OLED TV Explained guide.

HOW DOES ADSL2+ DIFFER TO ADSL?

The recent introduction of ADSL2+ has allowed users to increase their connection speed considerably. The thing is, not many people know the variation between the original ADSL connection and that of its new counterpart ADSL2+. The name does imply an improvement, but what exactly are the differences between ADSL and ADSL2+?

But before we delve into the differences between the two, let’s find out how ADSL came about…

Cast your mind back to the 1980’s, where the internet was barely even known or understood by the greater population. This is when a gentleman by the name of Joseph Lechleider came up with a way to transmit data over broadband signals — thus the broadband revolution was born. Not only did he find the solution of broadband internet, but also pioneered ADSL (Asymmetrical DSL). ADSL allowed it’s users to download information faster than they uploaded it. This was really the answer to many internet users’ problems as rarely did one need to upload faster than they could download.

ADSL was the first solution to make the shift from analogue to digital connections. This technology first came onto the scene by way of ISDN (Integrated Services Digital Network), which is basically a network of digital phone lines that allows voice and data to be transmitted anywhere in the world.

Since its inception, ADSL has only had the capacity to support a maximum speed of 2Mbps. When it was first released, this was an incredible speed as the main alternative at the time available to consumers was dial-up! Traditional ADSL also can sometimes take longer to connect to a network and quality can be compromised depending on the location of the connection. But don’t forget, at the time of introduction, ADSL was an incredible addition to the ISP market as it gave people the freedom to download faster than they uploaded, which mirrored the way the internet was being used.

Now let’s look at the ADSL and ADSL2+ comparisons. The true difference between ADSL and ADSL2+ is speed. Technology advances on a daily basis, but ADSL2+ really does have the capacity to change how the world communicates. ADSL2+ has the ability to support up to a whopping 24Mbps and can connect to networks extremely fast without much trouble. And at the end of the day, advances in internet are always about the speed of an internet connection — and ADSL2+ takes the cake!

Many ISP’s are either preparing for or offering ADSL2+ to their customers as you read this. ADSL2+ really has taken another leap forward in terms of how the world uses and communicates over the internet. Basically all that’s left to do is enjoy high internet download speeds, faster connections and less waiting around!