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The Open Systems Interconnection (OSI) model is a reference model from the International Organization for Standardization (ISO) that "provides a common basis for the coordination of standards development for the purpose of systems interconnection." In the OSI reference model, the communications between systems are split into seven different abstraction layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.
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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.
Data communication, including data transmission and data reception, is the transfer of data, transmitted and received over a point-to-point or point-to-multipoint communication channel. Examples of such channels are copper wires, optical fibers, wireless communication using radio spectrum, storage media and computer buses. The data are represented as an electromagnetic signal, such as an electrical voltage, radiowave, microwave, or infrared signal.
In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer: the layer most closely associated with the physical connection between devices. The physical layer provides an electrical, mechanical, and procedural interface to the transmission medium. The shapes and properties of the electrical connectors, the frequencies to transmit on, the line code to use and similar low-level parameters, are specified by the physical layer.
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The Network News Transfer Protocol (NNTP) is an application protocol used for transporting Usenet news articles (netnews) between news servers, and for reading/posting articles by the end user client applications. Brian Kantor of the University of California, San Diego, and Phil Lapsley of the University of California, Berkeley, wrote RFC 977, the specification for the Network News Transfer Protocol, in March 1986. Other contributors included Stan O. Barber from the Baylor College of Medicine and Erik Fair of Apple Computer.
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Power-line communication (PLC) is the carrying of data on a conductor that is also used simultaneously for AC electric power transmission or electric power distribution to consumers. The line that does so is known as a power-line carrier.
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David G. Messerschmitt is an engineer and professor emeritus at the University of California, Berkeley in the Department of Electrical Engineering and Computer Sciences in the UC Berkeley College of Engineering. He retired from UC Berkeley in 2005. At present he is conducting research at Berkeley, is a visiting professor in the Software Business Laboratory at the Helsinki University of Technology, and is doing research on interstellar communications at the SETI Institute. Messerschmitt also serves on the Advisory Council of METI.
Fumitada Itakura is a Japanese scientist. He did pioneering work in statistical signal processing, and its application to speech analysis, synthesis and coding, including the development of the linear predictive coding (LPC) and line spectral pairs (LSP) methods.
Ethernet over Coax (EoC) is a family of technologies that supports the transmission of Ethernet frames over coaxial cable. The Institute of Electrical and Electronics Engineers (IEEE) maintains all official Ethernet standards in the IEEE 802 family.
Dust Networks, Inc. is an American company that specializes in the design and manufacture of wireless sensor networks for industrial applications including process monitoring, condition monitoring, asset management, environment, health and safety (EHS) monitoring, and power management. They were acquired by Linear Technology, Inc in December 2011, which in turn was acquired by Analog Devices, Inc. in 2017. The Dust Networks product team operates in the IoT Networking Platforms group of Analog Devices.
Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information with an immediacy comparable to face-to-face communication. As such, slow communications technologies like postal mail and pneumatic tubes are excluded from the definition. Many transmission media have been used for telecommunications throughout history, from smoke signals, beacons, semaphore telegraphs, signal flags, and optical heliographs to wires and empty space made to carry electromagnetic signals. These paths of transmission may be divided into communication channels for multiplexing, allowing for a single medium to transmit several concurrent communication sessions. Several methods of long-distance communication before the modern era used sounds like coded drumbeats, the blowing of horns, and whistles. Long-distance technologies invented during the 20th and 21st centuries generally use electric power, and include the telegraph, telephone, television, and radio.
Edward Ashford Lee is an American computer scientist, electrical engineer, and author. He is Professor of the Graduate School and Robert S. Pepper Distinguished Professor Emeritus in the Electrical Engineering and Computer Science (EECS) Department at UC Berkeley. Lee works in the areas of cyber-physical systems, embedded systems, and the semantics of programming languages. He is particularly known for his advocacy of deterministic models for the engineering of cyber-physical systems.
Victor B. Lawrence is a Ghanaian-American engineer credited with seminal contributions in digital signal processing for multimedia communications. During his 30-plus-year tenure at Bell Laboratories, Dr. Lawrence made extensive and fundamental personal contributions to voice, data, audio and video communications. He led numerous projects that significantly improved or enhanced every phase in the evolution of early low-speed and today's high-speed data communications. He is a Research Professor and Director of the Center for Intelligent Networked Systems (iNetS) at Stevens Institute of Technology, where he also served as Associate Dean. He was inducted into the National Inventors Hall of Fame in 2016. He is a Member of the National Academy of Engineering, a Fellow of the IEEE for contributions to the understanding of quantization effects in digital signal processors and the applications of digital signal processing to data communications, a Fellow of AT&T Bell Labs, and a Charter Fellow of the National Academy of Inventors.
References
- ↑ Network News Transfer Protocol: A Proposed Standard for the Stream-Based Transmission of News, Request for Comments 977, Brian Kantor and Phil Lapsley, February 1986
- ↑ DSP Processor Fundamentals: Architectures and Features (IEEE Press Series on Signal Processing), Phil Lapsley, Jeff Bier, Amit Shoham, and Edward A. Lee, IEEE-Wiley, February 1997, ISBN 978-0-7803-3405-2
- ↑ Exploding the Phone website
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