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Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963. DTMF is standardized as ITU-T Recommendation Q.23. It is also known in the UK as MF4.
Electrical telegraphs were point-to-point text messaging systems, primarily used from the 1840s until the late 20th century. It was the first electrical telecommunications system and the most widely used of a number of early messaging systems called telegraphs, that were devised to communicate text messages quicker than physical transportation. Electrical telegraphy can be considered to be the first example of electrical engineering.
Telecommunications in the Philippines are well-developed due to the presence of modern infrastructure facilities. The industry was deregulated in 1995 when President Fidel Ramos signed Republic Act No. 7925. This law opened the sector to more private players and improved the provision of telecom services are better and fairer rates, leading to the creation of many telecommunication service providers for mobile, fixed-line, Internet and other services.
Telecommunications in Saudi Arabia have evolved early in the Kingdom since the establishment the Directorate of Post, Telephone and Telegraph (PTT) in 1926.
A teleprinter is an electromechanical device that can be used to send and receive typed messages through various communications channels, in both point-to-point and point-to-multipoint configurations. Initially they were used in telegraphy, which developed in the late 1830s and 1840s as the first use of electrical engineering, though teleprinters were not used for telegraphy until 1887 at the earliest. The machines were adapted to provide a user interface to early mainframe computers and minicomputers, sending typed data to the computer and printing the response. Some models could also be used to create punched tape for data storage and to read back such tape for local printing or transmission.
Telephony is the field of technology involving the development, application, and deployment of telecommunication services for the purpose of electronic transmission of voice, fax, or data, between distant parties. The history of telephony is intimately linked to the invention and development of the telephone.
In telecommunications, a transmission system is a system that transmits a signal from one place to another. The signal can be an electrical, optical or radio signal. The goal of a transmission system is to transmit data accurately and efficiently from point A to point B over a distance, using a variety of technologies such as copper cable and fiber optic cables, satellite links, and wireless communication technologies.
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The public switched telephone network (PSTN) is the aggregate of the world's telephone networks that are operated by national, regional, or local telephony operators. It provides infrastructure and services for public telephony. The PSTN consists of telephone lines, fiber optic cables, microwave transmission links, cellular networks, communications satellites, and undersea telephone cables interconnected by switching centers, such as central offices, network tandems, and international gateways, which allow telephone users to communicate with each other.
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ETV is an English language television channel in Sri Lanka owned by EAP Broadcasting Company, a subsidiary of EAP Holdings. Launched in 1995 as ETV 2, it was a sister channel of ETV 1. The channel's owner Extra Terrestrial Vision (Private) Limited, who had been incorporated on 6 July 1992, changed its name to EAP Network (Private) Limited on 30 April 1996 following the acquisition by EAP. At that time ETV 2 was re-broadcasting Star TV. ETV 1 was re-launched as Swarnavahini, a mass market Sinhala language channel, on 16 March 1997. ETV 2 was re-launched as ETV on 1 May 1998. EAP Network (Private) Limited changed its name to EAP Broadcasting Company (Private) Limited on 16 May 2012, EAP Network (Private) Limited on 31 October 2012, EAP Network Limited on 28 August 2013 and EAP Broadcasting Company Limited on 11 September 2013. In 2019, EAP Broadcasting Company parent company EAP Holdings was acquired by local company Ben Holdings (Pvt) Limited and Singapore based company Blue Summit.
Television in Sri Lanka dates back to 1979. Television broadcasting, like other forms of media in the country, is generally divided along linguistic lines with state and private media operators providing services in Sinhala, Tamil, and English languages.
The history of the Mass Rapid Transit (MRT) system of Singapore commenced with its planning in the 1960s, which finally led to its opening in 1987 with the launch of a 6 km section of the North South Line (NSL) from Yio Chu Kang to Toa Payoh. Since its inception, the rapid transit system has played a crucial role in the public transportation network and the wider development of the country as a whole, providing a fast and efficient means of transportation for millions of Singaporeans daily.
This is an alphabetical list of articles pertaining specifically to electrical and electronics engineering. For a thematic list, please see List of electrical engineering topics. For a broad overview of engineering, see List of engineering topics. For biographies, see List of engineers.
Standard Telephones and Cables Ltd was a British manufacturer of telephone, telegraph, radio, telecommunications, and related equipment. During its history, STC invented and developed several groundbreaking new technologies including pulse-code modulation (PCM) and optical fibres.
South East Asia–Middle East–Western Europe 4 is an optical fibre submarine communications cable system that carries telecommunications between Singapore, Malaysia, Thailand, Bangladesh, India, Sri Lanka, Pakistan, United Arab Emirates, Saudi Arabia, Egypt, Italy, Tunisia, Algeria and France. It is intended to be a complement to, rather than a replacement for, the SEA-ME-WE 3 cable.
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This glossary of electrical and electronics engineering is a list of definitions of terms and concepts related specifically to electrical engineering and electronics engineering. For terms related to engineering in general, see Glossary of engineering.