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Internet Stream Protocol
The Internet Stream Protocol (ST) is a family of experimental protocols first defined in Internet Experiment Note IEN-119 in 1979, and later substantially revised in RFC 1190 (ST-II) and RFC 1819 (ST2+). The protocol uses the version number 5 in the version field of the Internet Protocol header, but was never known as IPv5. The successor to IPv4 was thus named IPv6 to eliminate any possible confusion about the actual protocol in use. History The Internet Stream Protocol family was never introduced for public use, but many of the concepts available in ST are similar to later Asynchronous Transfer Mode protocols and can be found in Multiprotocol Label Switching (MPLS). They also presaged voice over IP. ST arose as the transport protocol of the Network Voice Protocol, a pioneering computer network protocol for transporting human speech over packetized communications networks, first implemented in December 1973 by Internet researcher Danny Cohen of the Information Sciences Institut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voice Over Stream Protocol (ST) - Early VOIP Prototype - Lincoln Lab, Signed By John Makhoul
The human voice consists of sound made by a human being using the vocal tract, including talking, singing, laughing, crying, screaming, shouting, humming or yelling. The human voice frequency is specifically a part of human sound production in which the vocal folds (vocal cords) are the primary sound source. (Other sound production mechanisms produced from the same general area of the body involve the production of unvoiced consonants, clicks, whistling and whispering.) Generally speaking, the mechanism for generating the human voice can be subdivided into three parts; the lungs, the vocal folds within the larynx (voice box), and the articulators. The lungs, the "pump" must produce adequate airflow and air pressure to vibrate vocal folds. The vocal folds (vocal cords) then vibrate to use airflow from the lungs to create audible pulses that form the laryngeal sound source. The muscles of the larynx adjust the length and tension of the vocal folds to 'fine-tune' pitch and ton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Packetized Voice
Voice over Internet Protocol (VoIP), also called IP telephony, is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. The terms Internet telephony, broadband telephony, and broadband phone service specifically refer to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the Internet, rather than via the public switched telephone network (PSTN), also known as plain old telephone service (POTS). Overview The steps and principles involved in originating VoIP telephone calls are similar to traditional digital telephony and involve signaling, channel setup, digitization of the analog voice signals, and encoding. Instead of being transmitted over a circuit-switched network, the digital information is packetized and transmission occurs as IP packets over a packet-switched network. They transport media streams using special media delivery protocol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Datagram
A datagram is a basic transfer unit associated with a packet-switched network. Datagrams are typically structured in header and payload sections. Datagrams provide a connectionless communication service across a packet-switched network. The delivery, arrival time, and order of arrival of datagrams need not be guaranteed by the network. History In the early 1970s, the term ''datagram'' was created by combining the words ''data'' and ''telegram'' by the CCITT rapporteur on packet switching, Halvor Bothner-By. While the word was new, the concept had already a long history. In 1962, Paul Baran described, in a RAND Corporation report, a hypothetical military network having to resist a nuclear attack. Small standardized "message blocks", bearing source and destination addresses, were stored and forwarded in computer nodes of a highly redundant meshed computer network. "The network user who has called up a "virtual connection" to an end station and has transmitted messages ... ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iris Digital Communications System
The Iris Digital Communications System, also known as the Tactical Command, Control, and Communications System (TCCCS), is a tactical communication system used by the Canadian Army. It was a pioneering system that integrated voice and data communications via the Internet Protocol and ST-II protocol. Elements of the Iris system, together with the High-capacity data radio, later formed the foundation of the British Army's Bowman communications system. The Iris system was originally conceived in the early 1970s, with a contract signed to Computing Devices Canada (now General Dynamics) as system integrator in April 1991. The complete Iris system was delivered to the Department of National Defence in November 2003, for a total cost of $2 billion Canadian. Iris is an integrated voice and data distribution system that provides secure and survivable communications. It provides end-to-end services across a variety of tactical radios, telephones, computers, and fiber-optic, wireless, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defense Simulation Internet
{{more footnotes, date=June 2019 The Defense Simulation Internet (DSI) was a specialized, wide-area network created to support Distributed Interactive Simulation and videoconferences. It was sponsored by DARPA, and built and operated by BBN Technologies from about 1991-1995, after which time it was operated by the Defense Information Systems Agency (DISA). The DSI evolved from DARPA's earlier Terrestrial Wideband Network, which could provide the realtime multicast with bandwidth guarantees that are essential to distributed interactive simulations via the Internet Stream Protocol (ST-II). A Defense Science Board study in 1993 highlighted the importance of these capabilities in simulations, and by late 1994, the DSI connected about 100 local area networks at sites around the world. Many links operated at multiple T1 circuits, for an aggregate bandwidth of about 6 megabits/second. In 1994, DSI program management transitioned to a joint program office of DARPA and DISA, and after the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terrestrial Wideband Network
{{more footnotes, date=June 2019 The Terrestrial Wideband Network was a DARPA-sponsored experimental network designed to support research in high-speed networking protocols and distributed multimedia applications. It was built and operated by BBN Technologies from May 1989 to about 1991; although originally planned to turn into the Defense Research Internet, it instead evolved into the Defense Simulation Internet. The Terrestrial Wideband Network was a trans-continental network implemented via Wideband Packet Switches (based on BBN Butterfly parallel computers) connected by T1 circuits. It replaced the 3 megabit/second Satellite Wideband Network, which had been in operation for the previous 8 years. Because it was based on a single cross-country T1 trunk from the DARPA National Networking Testbed (NNT), the Terrestrial Wideband Network's topology was linear, i.e., a series of packet switches connected in a line by T1 trunks. Each T1 link ran at 1.544 megabits per second. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voice Funnel
The Voice Funnel was an experimental high-speed interface between digitized speech streams and a packet switching communications network, in particular the ARPANET. It was built in the time frame from 1979 to 1981. It may be viewed as an early Voice over IP voice and video telephone. The Voice Funnel was designed and built by Bolt, Beranek and Newman. During the 1980s, it was used for audio and video conferences across the ARPANET, and later evolved into the multi-processor BBN Butterfly computer. See also *Network Voice Protocol References * Rettberg, R., C. Wyman, D. Hunt, M. Hoffman, P. Carvey, B. Hyde, W. Clark and M. Kraley. ''Development of a Voice Funnel System: Design Report'', Bolt, Beranek and Newman Raytheon BBN (originally Bolt Beranek and Newman Inc.) is an American research and development company, based next to Fresh Pond in Cambridge, Massachusetts, United States. In 1966, the Franklin Institute awarded the firm the Frank P. Brown ..., Report No. 4098, A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DARPA
The Defense Advanced Research Projects Agency (DARPA) is a research and development agency of the United States Department of Defense responsible for the development of emerging technologies for use by the military. Originally known as the Advanced Research Projects Agency (ARPA), the agency was created on February 7, 1958, by President Dwight D. Eisenhower in response to the Soviet Union, Soviet launching of Sputnik 1 in 1957. By collaborating with academia, industry, and government partners, DARPA formulates and executes research and development projects to expand the frontiers of technology and science, often beyond immediate U.S. military requirements.Dwight D. Eisenhower and Science & Technology, (2008). Dwight D. Eisenhower Memorial CommissionSource ''The Economist'' has called DARPA the agency "that shaped the modern world," and pointed out that "Moderna COVID-19 vaccine, Moderna's COVID-19 vaccine sits alongside weather satellites, Global Positioning System, GPS, Unmann ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internet Protocol
The Internet Protocol (IP) is the network layer communications protocol in the Internet protocol suite for relaying datagrams across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet. IP has the task of delivering packets from the source host to the destination host solely based on the IP addresses in the packet headers. For this purpose, IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information. IP was the connectionless datagram service in the original Transmission Control Program introduced by Vint Cerf and Bob Kahn in 1974, which was complemented by a connection-oriented service that became the basis for the Transmission Control Protocol (TCP). The Internet protocol suite is therefore often referred to as ''TCP/IP''. The first major version of IP, Internet Protocol Version 4 (IPv4), is the do ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Information Sciences Institute
The USC Information Sciences Institute (ISI) is a component of the University of Southern California (USC) Viterbi School of Engineering, and specializes in research and development in information processing, computing, and communications technologies. It is located in Marina del Rey, California. ISI actively participated in the information revolution, and it played a leading role in developing and managing the early Internet and its predecessor ARPAnet.Bekey, George A. ''"A Remarkable Trajectory: From Humble Beginnings to Global Prominence'', The history of the USC Viterbi School of Engineering." Charleston: CreateSpace, 2015. Print. The Institute conducts basic and applied research supported by more than 20 U.S. government agencies involved in defense, science, health, homeland security, energy and other areas. Annual funding is about $100 million. ISI employs about 400 research scientists, research programmers, graduate students and administrative staff at its Marina del ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
