3 types of Wireless Internet
O ne of most exciting new technologies today is Wireless Internet Service. Wireless technology is playing an increasing role in the lives of people around the world. Many persons from doctors and policemen to salespeople and businessmen everyday at offices, at home and on the move use Internet services from cell phones, PDAs, Pocket PCs, laptops, and can not work and live normally without it.
Wireless technology uses as a medium of communication the radio waves that operate in the 3 KHz to 300 GHz range. For comparison, the AM radio band operates in 1 MHz diapason, the FM radio band operates in diapason of 100 MHz, and the GPS (Global Positioning Satellite) band operates in the diapason 1.5 GHz.
Today, 3rd Generation Wireless, or 3G, is the term used for the next generation of wireless or mobile communications systems. 3G systems aim to provide enhanced voice, text and data services to each user. The third generation networks supports real time video, high speed multimedia and mobile Internet access. There is also coming soon a cellular standard should be called as 4G. The fourth generation being championed in Japan will boost the data rates to 20 Mbps. These speeds enable high quality video transmission and rapid download of large music files. The first 4G phones may appear in USA as soon as 2006.
Below we describe the some variety of technologies of modern Wireless Internet mentioning some corresponding Connection standards or Protocols.
Cellular Internet services is based on a cellular architecture that consists of a backbone network with fixed base stations interconnected through a the wired public switched telephone network (PSTN). The geographic area within mobile units (cell phones) can communicate with a particular base station is called a cell . Adjacent cells overlap with each other, thus ensuring continuity of communications when the users move from a territory of one cell to another cell. The users mobile units communicate with each other, as well as with other networks, through the base stations and the backbone network. A set of channels ( radio frequencies) is allocated to each base station. Neighboring cells have to use different channels in order to avoid intolerable interferences. The Global System for Mobile TeleCommunications (GSM) is the most popular standard for mobile phones in the world, developed according to the 3rd Generation Partnership Project (3GPP). This Project is a co operation between ETSI ( Europe ), ARIB/TTC ( Japan ), CCSA ( China ), ATIS ( North America ) and TTA ( South Korea ). The based on these project standards make it possible to use the same phones with different companies' services, or even roam into different countries. For these standards both signaling and speech channels are digital. General Packet Radio Service (GPRS) is a mobile data service available to users of GSM mobile phones. It is often described as "2.5G", as a technology between the second (2G) and third (3G) generations of mobile telephony. GPRS was invented with the idea that cell phones can also be computers, e mail and Web browsers and even TV receivers. 3G based on two main standards W CDMA (Wideband Code Division Multiple Access) and CDMA2000 ( Code Division Multiple Access 2000).
Wireless Application Protocol (WAP) is an open international standard for Internet access from very small portable devices such as PDAs and mobile phones. WAP allows users to send and receive emails, get the latest Stock Exchange Indexes, receive all the sport results, and keep up with the latest news headlines.
Wireless Internet services are provided by many companies, for example: International Internet Access Provider , Ace Telecom , Boston Communications Group , Dobson Communications Group , Leap Wireless International, Inc. , and so on.
Lots of places now offer wireless high speed Internet access, including Airports, Hotels,
replica rolex oyster perpetual datejust value, Coffee Shops, Internet Cafes and Restaurants. These locations are called "HotSpots". Many charge a daily or hourly rate for access, but some are free. Some cities offer free wireless "hot spots" to attract visitors, while businesses are pursuing this wireless in numerous ways. Locations that do not charge for access to Internet are called "FreeSpots". An interconnected area of hot spots and network access points is known as a hot zone. Numerous Web sites offer searchable listings of public Wi Fi hotspots, both free and paid: Jiwire , Wi Fi ZONE Finder , The Hotspot Haven , WiFinder .
HotSpots and FreeSpots used standards of WLAN (Wireless Local Area Network). The most common standard is IEEE 802.11b (also called 'Wi Fi' short for "Wireless Fidelity" ) which offers a connection speed of 11 megabits per second. Other standards are 802.11a (55 megabits per second) and the latest standard '802.11g', which is compatible to 802.11b, but also operates on 55 megabits per second. The three competing groups ( TGnSync , WWiSE and MITMOT) submitting proposals to the IEEE for the 802.11n next generation Wi Fi standard have agreed to work together to create a common and agreed standard. 802.11n is being designed for speeds of 100Mbps and will have a better operating distance than current Wi Fi networks.
A Public Wireless Hotspot is a area where a computer or PDA equipped with a WLAN module can connect to the Internet through Wireless Access Points. A single Access Point can be reached from a distance of no more than 100 200 meters (300 600 ft.), but there also exist Hotspots consisting of hundreds of Access Points which cover entire Airports for example.
A company which installs Hotspots and offers the user a unified access and payment method for WLAN usage is
a WISP (Wireless Internet Service Provider). Right now, WISPs are being founded all over the world. To find Hotspot location you can use the website Hotspot locations , to find information about this type of service website Hotspot services.
Wi Fi Protected Access (WPA) is a system to secure wireless (Wi Fi) networks, created to patch the security of the previous system, WEP (Wired Equivalent Privacy).
There are some existed providers of Hotspots systems: T Mobile , Boingo , Gric MobileOffice , CometaNetworks , etc.
Some hotspot are equipped by the PayKiosks terminals that allow users without mobile devices to reach the Internet as easily as they would use a pay phone or an ATM. Usually customers have the choice of either accessing the Internet on the PayKiosks terminal or using the wireless signal transmitted from the terminal to connect their own laptop or PDA. At present, pay per use Internet terminals can only be found in large hotels and airports in major US cities. Huge growth is forecast for this industry and very quickly Internet terminals will be appearing all over North America .
Satellite internet from anywhere
Satellite communication are provided for Rescue services, Maritime industry, Oil, Gas and Mining industry, Transportation and Traveling , Army and Navy,
replica rolex oyster perpetual datejust womens, and so on. Today this type of communication insures the better quality than traditional radio systems. To receive a Satellite service, user needs an antenna with transmitter aimed at the correct satellite and a very specialized modem which connects to his computer. Two way satellite Internet sends data from remote sites via satellite to a hub, which then sends the data to the Internet. For Satellite Internet everything is possible : to surf the world wide web, to send and receive email and anything else that can do with an dial up, cable or DSL connection. Inexpensive telephone calls [VoIP] are also possible. This 24/7 high speed internet connection is always on. Satellite Internet uses advanced encryption technology to handle sensitive data and protect users privacy, therefore satellite connection is secure and safe from hackers. Two way satellite Internet usually consists of:
Coaxial cables between dish and modem
The satellite dish antenna gets mounted on the wall (balcony, roof, etc.) or near home and connects via coaxial cable to a satellite modem. It may be mounted also on a truck, van, railroad car, trailer, etc.
The television and internet providing satellites are all in geosynchronous orbit, meaning that they stay in one place in the sky relative to the Earth. Each satellite is launched into space at about 7,000 mph (11,000 kph), reaching approximately 22,200 miles (35,700 km) above the Earth. At this speed and altitude, the satellite will revolve around the planet once every 24 hours the same period of time it takes the Earth to make one full rotation. Satellite system providers can use constellation of satellites. For example, Iridium Satellite LLC. uses a constellation of 66 low earth orbiting (LEO) satellites operated by Boeing.
Satellite services are provided for US users from a satellite transponders owned by either SES Americom , Satmex , PanAmSat , Intelsat , Telesat , New Skies , etc or for other continents by Inmarsat , Iridium , and so on.
The satellite antennas are manufactured by a several l companies including Prodelin , Patriot Antenna Systems , Thrane Thrane , the most popular internet modems are provided by iDirect Technologies , Direcway, ViaSat ,
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Here is a couple words about Inmarsat , that was as the world's first global mobile satellite communications operator and is still the only one to offer a mature range of modern communications services to maritime, land mobile, aeronautical and other users.
Today's Inmarsat system is used by independent service providers to offer a range of voice and multimedia communications. The Inmarsat business strategy is to pursue a range of new opportunities at the convergence of information technology, telecoms and mobility while continuing to serve traditional maritime,
replica rolex oyster perpetual datejust blue face, aeronautical, land mobile and remote area markets.
Keystone of the strategy is the new Inmarsat I 4 satellite system, which from 2004 support the Inmarsat Broadband Global Area Network (BGAN) , offering two powerful and flexible services Mobile ISDN and Mobile Packet Data Service. Integrated Services Digital Network (ISDN) is a type of circuit switched telephone network system, designed to allow digital transmission of voice and data over ordinary telephone copper wires, resulting in better quality and higher speeds, than available with analog systems.
The modern communication wireless service providers can uses a combination of all 3 types of wireless Internet, including implementation for VPNs and PANs.
A Virtual Private Network, or VPN, is a private communications network usually used within a company, or by several different companies or organizations, communicating over a public network. VPN message traffic is carried on public networking infrastructure ( the Internet) using standard protocols.
Personal area networks (PANs) are short range wireless networks that connect wireless devices to one another. The most dominant form of Personal Area Network technology is Bluetooth, which links wireless devices at very short distances. Bluetooth allows for fast data speeds (between 1Mbps and 2Mbps), but is designed only for peer to peer data transfer.
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