Technology of Electronics,Telecomunication, IT

HISTORY OF SATELLITE COMMUNICATIONS The first artificial satellite was placed in orbit by the Russians in 1957. That satellite, called Sputnik, signaled the beginning of an era. The United States, who was behind the Russians, made an all-out effort to catch up, and launched Score in 1958. That was the first satellite with the primary purpose of communications. The first regular satellite communications service was used by the Navy in 1960. The moon was used to bounce teletypewriter signals between Hawaii and Washington, D.C. During the early 1960s, the Navy used the moon as a medium for passing messages between ships at sea and shore stations. This method of communications proved reliable when other methods failed. Military satellite communications technology was at a low level until 1965. At that time high quality voice transmissions were conducted between a satellite and two earth stations. That was the stepping stone to the Initial Defense Communications Satellite Program (IDCSP), w...

internet marketing internet marketing

Earn money with AlertPay Electronic commerce, commonly known as (electronic marketing) e-commerce or eCommerce, consists of the buying and selling of products or services over electronic systems such as the Internet and other computer networks. The amount of trade conducted electronically has grown extraordinarily with widespread Internet usage. The use of commerce is conducted in this way, spurring and drawing on innovations in electronic funds transfer, supply chain management, Internet marketing, online transaction processing, electronic data interchange (EDI), inventory management systems, and automated data collection systems. Modern electronic commerce typically uses the World Wide Web at least at some point in the transaction's lifecycle, although it can encompass a wider range of technologies such as e-mail as well. A large percentage of electronic commerce is conducted entirely electronically for virtual items such as access to premium content on a website, but most electr...

The simple sense of Forex ( Forex currency exchange , Foreign Exchange ) is simultaneous purchase and sale of the currency or the exchange of one country's currency for the one of another country. The world currencies do not have a fixed exchange rate and are always fluctuating being traded in the currency pairs like Euro/Dollar, Dollar/Yen an others. 85% of daily trades are taken by major currencies trading. Investments usually deal with 4 major pairs: Euro against US dollar, US dollar against Japanese yen, British pound against US dollar, and US dollar against Swiss franc or EUR/USD, USD/JPY, GBP/USD, and USD/CHF used to sign these pairs accordingly. These major pairs are considered as Forex market's "blue chips". You will not receive any dividends on the currencies. Well known "buy low - sell high" gives the profit for currency trades. In case you have a forecast that one currency would get higher to another you can exchange the secon...

HSDPA High-Speed Downlink Packet Access (HSDPA) is a 3G (third generation) mobile telephony communications protocol in the High-Speed Packet Access (HSPA) family, which allows networks based on Universal Mobile Telecommunications System (UMTS) to have higher data transfer speeds and capacity. Current HSDPA deployments support down-link speeds of 1.8, 3.6, 7.2 and 14.4 Mbit/s. Further speed increases are available with HSPA+, which provides speeds of up to 42 Mbit/s downlink. Technology The High-Speed Downlink Shared Channel (HS-DSCH) lacks two basic features of other W-CDMA channels—variable spreading factor and fast power control. Instead, it delivers the improved downlink performance using adaptive modulation and coding (AMC), fast packet scheduling at the base station, and fast retransmissions from the base station, known as hybrid automatic repeat-request (HARQ). Marketing as mobile broadband During 2007, an increasing number of telcoms worldwide began selling HSDPA USB modems as m...

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