A modem (modulate demodulate) is a network device that both modulates and demodulates analog carrier signals (called sine waves) for encoding and decoding digital information for processing (Janssen C 2014). The most common use of modems is both for sending and receiving digital information between personal computers and for connecting to the internet. Modem is considered as an important hardware of computer and most computers in the past came with a built in modem, but now many manufacturers are not including it because of the increased popularity of broadband connections. This essay will concisely discuss the history of the modem and highlight the key developments of this technology. It will also throw light on the factors that influenced this technology and outline its current features.
Modems originated as a way for teletype machines to communicate over ordinary telephone lines. When the US Air Force needed a convenient way of transmitting hundreds of radar images to command centers during the Cold War in the end of 1940s, they turned to the telephone system and modems as a solution (Dalakov 2014). Thus, first digital modem was developed in 1950s. In 1962, the first commercial modem was manufactured – the Bell 103 by AT&T. The Bell 103 was also the first modem with full- duplex transmission, frequency-shift keying, and had a speed of 300 bits per second (Wright 2014). For many years, AT&T hold a monopoly on the phone system in the United States, so only AT&T could provide modems to work on its network (Edwards 2014). Companies got around this restriction by inventing the acoustic coupler, which hooked a radio or modem to the telephone system via a cradle in which the user placed a standard phone handset. This way, the modem c...
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The origin of the new AT&T was the culmination of the progress in communications in the United States. AT& T's roots extend back to 1876, with Alexander Graham Bell's invention of the telephone and the founding of the company that became AT&T. As the parent company of the Bell System, AT&T provided what was by all accounts the best telephone service in the world.
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systems. But this era became obsolete with the advent of telephone networks and modems which necessitated
The company expanded in the 1950aê¡?s and 1960aê¡?s and became semiconductor producers for other manufacturers. Motorola also became a global company in the 1960aê¡?s. In the 1970aê¡?s Motorola introduced the companyaê¡?s first microprocessor and a prototype for the worldaê¡?s first commercial portable phone. In the 1980aê¡?s and 1990aê¡?s Motorola provided the worldaê¡?s first computerized engine control, invented the Six Sigma quality improvement process, launched the MicroTac which was then the smallest and lightest cellular phone on the market. In the 21st century Motorola has provided the worldaê¡?s first GPRS cellular system, the worldaê¡?s first wireless cables modem gateway, and the MOTORAZR V3 cellular phone.
The uses of Digital Signal Processing in communications has become so large scale that nearly any form of analog communication is considered obsolete. Today, nearly any form of communication used, aside from verbal communication, relates to Digital Signal Processing. Some of the more prominent uses for DSP in communications are; local area networks, cell pho...
Telephone invention is the most marvellous innovation considered in the world. We often consider our society to be saturated by technologies of many sorts. Telephone is classed among the information and communication technologies It is now considered one of the major source of communication. It form and functions precisely defined the challenges of interaction between two separate parties: long distance is conquered instantly and any telephone in the world can connect to different location by means of networks. In this material I will like to focus on the noticeable, persistence and essential contribution of telephone and its impact on social, political, economy and modern engineering practices.
... top 50 U.S. web properties for June 2010, Retrieved August 08, 2010 from: http://www.comscore.com/Press_Events/Press_Releases/2010/7/comScore_Media_Metrix_Ranks_Top_50_U.S._Web_Properties_for_June_2010/%28language%29/eng-US
In 1921 the Detroit Michigan Police Department first used mobile radio in a vehicle. Digital wireless and cellular roots started in the 1940s. In the 1940s new frequencies between 30 and 40 MHz were available. There was an increase of availability in channels which police systems were encouraged to use. Mobile units were available within private companies, individuals, and public agencies. In St. Louis, 1945 the first mobile telephone system in the US was introduced. Along the highway between New York and Boston a Public mobile system carried greater frequency distance in 1947. In 1n 1949, the FFC authorized separate radio channels to common carriers. A new system was developed with automatic channel selection in 1964. With this new system each call allowed customers to dial for themselves and it eliminated the need to push-to-talk operation. In 1975, in Chicago, AT&T was authorized to develop a cellular system. After this AT&T and Bell labs work with other cellular vendors to develop their cellular phones. Their phones were made so consumers would have the quality products available to use on cellular networks. There are many reasons why the mobile wireless has not progressed further in the last 60 years, this is because of cautiousness and federal regulation. The Federal Communications Commission controlled frequency availability. Their regulations and unresponsiveness had the most significant factors hindering radiotelephone development. The Federal Communication Commission delayed the technology in America by ten years.
In Computers Modulator Demodulators (Modems) are used to change the analogue to digital and the other way around. The modem uploads
On June 21, 1890, Bell and his assistant Charles Sumner invented a wireless telephone, named a photo phone. This photo phone allowed the transmission of both sound and huma...
Despite the short amount of time since the introduction of the smartphone, the rapid development of the software and technology has had a tremendous effect on the everyday life of society today. The concept of communicating through a telephone was developed in the 1870s. Devices to transmit speech electrically were designed by Elisha Gray and Alexander Graham Bell, but Bell's design was patented first. On March 10, 1876, Alexander Graham Bell achieved one of his greatest successes in the making of the telephone. This brought upon a major change in communication and gave leeway to the improvement of the telephone in the days to come (Bellis, 2013b).