Personal digital assistants

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The Palm TX A personal digital assistant (PDA), also known as a palmtop computer, is a mobile device which functions as a Personal information manager and connects to the internet. The PDA has an electronic visual display enabling it to … Read More

Cordless telephones & Wireless phone systems

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Cisco 7920 Wireless IP Phone Cordless telephones Cordless telephones consist of a base unit that connects to the land-line system and also communicates with remote handsets by low power radio. This permits use of the handset from any location within … Read More

Teleprinters

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A teleprinter (teletypewriter, teletype or TTY) is a now largely obsolete electro-mechanical typewriter which can be used to communicate typed messages from point to point through a simple electrical communications channel. It had a very limited character set, and poor … Read More

Land-line based phone systems and fixed telephony

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Modern emergency telephone powered by sound alone. The network that connects most phones together is known as the PSTN (public switched telephone network). Fixed phone lines are usually copper wirelines which form a circuit between the subscriber and the exchange, … Read More

Appliance vs computer

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The term information appliance was coined by Jef Raskin around 1979.[1][2] As later explained by an influential Donald Norman’s The Invisible Computer,[3] the main characteristics of IA, as opposed to any normal computer, were: designed and pre-configured for a single … Read More

TWX

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Almost in parallel with Germany’s telex system, Bell Labs in the 1930s decided to go telex one better, and began developing a similar service (with pulse dialing and all!) called “Teletype Wide-area eXchange” (TWX). TWX originally ran 75 bits per … Read More

Digital signal processing

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Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals. DSP and analog signal processing are subsets of signal processing. It has three major subfields: audio signal processing, digital image … Read More

Definition of the telecommunication

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Telecommunication is the extension of communication over a distance. In practice it also recognizes that something may be lost in the process; hence the term ‘telecommunication’ covers all forms of distance and/or conversion of the original communications, including radio, telegraphy, … Read More

About telecommunication

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Optical fiber provides cheaper bandwidth for long distance communication Bell Labs scientist Claude E. Shannon published A Mathematical Theory of Communication in 1948. This landmark publication was to set the mathematical models used to describe communication systems called information theory. … Read More

Phreaking

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Phreaking is a slang term for the action of making a telephone system do something that it normally should not allow. It is an illegal activity, but one formerly pursued by a large number of computer and electronics hobbyists out … Read More

Fax

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Fax (short for facsimile or telefacsimile) is a telecommunications technology used to transfer copies of documents, especially using affordable devices operating over the telephone network. Such faxes became affordable and very popular in the 1980s. They transfer one or a … Read More

Satellites

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A satellite is an object that orbits another object. With sufficient tangential velocity, the object does not collide with the primary object it orbits, but maintains a distance from that object as the rate at which it falls towards that … Read More

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