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admin
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Published
October 7, 2009
VoIP has revolutionized the way telecommunication is done. Voice over Internet protocol allows voice packets to be sent over Internet bandwidth enabling cheap communication. There are many companies which offer voice over Internet services and some of the leading ones are Vonage, Skype, Yahoo and Net2Phone. Consumers can access VoIP over Internet connections like broadband and DSL. Satellite Internet is a new technology that has become very popular in recent times and VoIP providers are able to offer services to customers in remote regions using it. It will still take some time until VOIP by satellite is ultimately stabilized and customers can enjoy the full benefits.Some of the challenges faced by service providers include packet loss, jitters and limited bandwidth. Service providers like Hughes and Skyframes which have their own satellites are teaming up with the VoIP providers to offer voice services to customers. Designing a VoIP network would require details on the bandwidth requirement for VoIP data. Satellite Internet providers are facing challenges on the bandwidth capacity that would be required to offer VoIP services via satellite channels. G.729 (b) encoding with a 40 b payload and header compression would require 10 Kbps of bandwidth. Packet loss is another challenge faced by service providers offering satellite VoIP services. Packet loss causes degradation in voice quality. The protocol used for voice traffic transmission is UDP/IP and if the data packets are corrupted they cannot be retransmitted. TCP/IP protocol allows retransmission of data packets. It is important to maintain very low bit error rates to offer high quality voice services to customers. Jitters are another technology hurdle that is faced by satellite VoIP service providers. It is used to calculate the delays in packet arrivals that happen because of network delay. If this… Continue reading
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By
admin
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Published
March 9, 2009
By now you have certainly heard of the revolutionary new video game platform, the Nintendo Wii. Unlike anything that has come before it, the Wii makes the players part of the game with its revolutionary new control system. The Wii controller is a wireless remote control that senses movements in three dimensions. That remote sensing technology allows you to eschew the conventional buttons and joysticks that have been the standard for video games for decades. Instead, of pushing buttons or moving a stick, you move your arms; gesturing, swinging, poking, and sometimes flailing your way through the game! If you want to experience this amazing new game platform for yourself it can be difficult to know exactly what to purchase in order to have everything you need to enjoy the Wii experience. That is why the Nintendo Wii bundle is such an enticing option.Purchased by itself, the Wii comes with a remote control – officially called a Wiimote – and a Nunchuk controller; an analog joystick that attaches to the Wiimote using a long cable. The Nunchuk also has the internal accelerometer that the Wiimote possesses, so it too is capable of motion sensing as well. The Nunchuk is to be used in conjunction with the Wiimote and it serves to enhance the game play experience. Further, the Wii includes all the power cords, audio-video cords, and the sensor bar and stands that you need to get started. Most important, the Wii includes Wii Sports, a game that lets you test your skills on the golf course, baseball diamond, bowling alley, boxing ring, and tennis court; it is the perfect platform to demonstrate the things the Wii can do. However, for those who want to see all the Wii is capable of
By
admin
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Published
October 21, 2008
A satellite can be described as any object whether it is man made or naturally occurring that orbits around something else. There are over ten types of man-made satellite.Some of the main types of man made satellites that are used today include the communication satellite, astronomical satellite, earth observation satellites, weather satellites, and space stations.Communication satellite is a satellite that is stationed in space for the intention of telecommunications. It relays messages, radio, and telephone and television signals. The earth station that is based on the ground transmits signals to the satellite, which then conveys signals to other earth stations. Communication satellites are very effective in bringing the people together because communications that used to take days or even months, now only takes a minute or second using satellites.The communication equipments are those apparatus that are used to distribute information from one place to the other. It includes devices like Ethernet, antenna, network routers, network switches, transceivers, signal conditioners, signal transmitters, signal receivers, and signal transmission medium. These equipments facilitate the transmission of voice, video and data application signals from one place to the other and are used in many communication devices such as mobile phones, pagers, radio systems, and telephones.The astronomical satellites help in giving information about space and the universe that may not be acquired by observatories on earth. It sends data about the earth’s magnetic field and its radiation belts and the solar wind identify radiation such as gamma rays, infrared rays, ultra violet rays, and X-rays from the outer space that point out the existence of various objects varying from stars and galaxies to quasars, invisible gas clouds, black holes, and the ruins of the exploding stars.An Infrared Astronomical satellite was the first space-based observatory to present a
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admin
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Published
July 3, 2008
Wouldn’t it be nice if every time you turned your computer on it operated like it was brand new? Unfortunately, it doesn’t happen that way.The Problem With Computers Today – They’re Not Hassle-FreeComputers are getting more complex every day. Most of us think as new bells and whistles are added that computers are getting easier to run. Unfortunately, that’s not so. In fact, computer problems are getting worse.Computers today are not hassle-free. For most of us hassles, headaches and frustrations from computer problems are commonplace.Cyber-crime – A Huge Computer Problem MakerCyber-crime is booming. According to V. McNiven, advisor to the U.S. Department of Treasury, “The proceeds from cyber-crime are now greater than the sale of illegal drugs.”Vent Cerf, founder of the Internet says about 150 million PCs currently connected to the Internet are part of Botnets – networks of PCs under hacker control. Sophos Labs recently announced that one million new forms of spyware were spewed out over the Internet in the first two months of 2008.How does this relate to your computer problems? The spyware hackers use to steal information or take control causes slow downs and computer problems.Hackers are smart. They are developing more sophisticated spyware that is hard to detect and even harder to destroy. As a result, the traditional over-the-counter products are generally rendered ineffective. If they were effective would we have the problems we have today?What are the options? Repairing and maintaining your computer is expensive. Most of us don’t have the expertise to maintain, repair and/or protect our PC. Frankly, “do-it-yourself” and having your computer geek cousin fix your computer isn’t working. We end up wasting valuable time and money trying to keep our computer running.“Cycle of Common Non-Sense”Whether we know it or not, the moment
