EigenGraphs

The common perception is that VoIP is so cheap because most things are cheap on the net. There’s fierce competition, and much lower costs etc. However you need to take into account the history of the telcos and how they relate to computer networks, and the way data actually travels around the Internet. An knowledge of this is necessary to fully comprehend the confusion behind the VoIP vs. POTS pricing riddle.

Long before computer networks became important telephone companies were using digital communication. In the beginning the very first digital voice circuit was used in Chicago in 1962 however ARPANET, the forerunner to today’s Internet, wasn’t up and running until 1969. The telecommunication companies used these digital circuits to make lots of voice connections over long distances something that analogue circuits were unable to do and to this day still use them for this purpose.

Voice communication has a few unique characteristics. For one thing, it’s inherently real-time. You’d get frustrated if phone calls consisted of long periods of silence followed by several seconds of high-speed playback to catch up with the conversation on the other end. To keep this from happening digital voice circuits provide guaranteed Quality of Service (QoS). Once a connection is provisioned, you’ll always get exactly the amount of bandwidth you need. It’s not just bandwidth though; jitter is also carefully controlled by using small, fixed sized data packets. The point is these networks were specially designed for voice communication.

When computer networks began emerging in the 1980s companies wanted in. They already had a lot of infrastructure in place so they began looking at how they could send data over their existing phone lines. They came up with quite a few different technologies with varying levels of success. But there was (and still is) a problem: data networks are fundamentally different from voice networks.

Data is transferred in packets, which can arrive in any order a long time after they have been requested, without causing problems. Internet Protocol (IP) was created to provide best effort delivery. Telecoms companies had an expensive network in place, so there was a lot of incentive to use it. After a few misses Asynchronous Transfer Mode (ATM) was created as a compromise technology that could carry both voice and data. However it’s much less efficient than a pure data network. The overhead for data transfers on ATM is more than 10link, compared to about one percent for an Ethernet running full-throttle.

The U900 Soul represents all that is good about Samsung. Like other similar models from Samsung the design is quite contemporary and would be appealing to a very broad range of customers.

This mobile phone can only be bought in Silver. The Samsung U900 Soul is compatible with 2G GSM 900 / 1800 / 1900 and 3G HSDPA 2100. This phone has a 5 MP, 2592х1944 pixels, autofocus, image stabiliser, video(QVGA), flash camera. If you use the Internet on the move, you will be pleased to know a WAP 2.0/xHTML, HTML, RSS feeds compatible browser is included. The Samsung U900 Soul is fitted to a Li-Ion 800 mAh, battery cell. The Samsung U900 Soul comes equipped with bluetooth, making interactivity with the majority of up to date mobile devices very easy. Moving on to the display the phone is supplied with a 2.2 inch screen, which, taking into consideration other phones you could get for this kind of price is a pretty average size display. The screen is a TFT, 16M colors. The U900 Soul has Polyphonic, MP3 ring tones enabled on top of which is a vibrating alert. Additional features of the Samsung U900 Soul include:

The U900 Soul is amongst the latest phones currently on the market, despite this it is still possible to find yourself a good deal on this mobile handset. Because there are now so many online stores it has never been more convenient or more cost effective to shop for a mobile phone. Shopping online can save you a lot of money, surprisingly, it is possible to get a phone with 6 months free line rental on the Samsung U900 Soul , which, if you are clever will not cost anything to run.