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Via Net Loss
{{unreferenced, date=April 2019 Via Net Loss (VNL) is a network architecture of telephone systems using circuit switching technologies deployed in the 1950s with Direct Distance Dialing and used until the late 1980s. The purpose of the VNL plan and a five-level long-distance switching hierarchy was to minimize the number of trunk circuits used during a call and maximize the voice quality achieved on each circuit. Excessive noise or loss meant that subscribers may have difficulty hearing each other. This was particularly important in the 1960s when dial-up data applications were developed using analog modems. The five levels of PSTN switching systems used with VNL were: * Class 1 - Regional long-distance switching system * Class 2 - Sectional long-distance switching system * Class 3 - Primary long-distance switching system * Class 4 - Toll-access switching system * Class 5 - End-office switching system Class 5 end-office switches provide local telephone service and dialtone to res ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Switched Telephone Network
The public switched telephone network (PSTN) provides Communications infrastructure, infrastructure and services for public Telecommunications, telecommunication. The PSTN is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telephony operators. These consist of telephone lines, fiber optic cables, microwave transmission links, Routing in cellular networks, cellular networks, communications satellites, and undersea telephone cables, all interconnected by switching centers which allow most telephones to communicate with each other. Originally a network of fixed-line Analog signal processing, analog telephone systems, the PSTN is now almost entirely digital in its core network and includes mobile and other networks, as well as fixed telephones. The technical operation of the PSTN adheres to the standards created by the ITU-T. These standards allow different networks in different countries to interconnect seamlessly. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Utilities Commission
In the United States, it is a governing body of a utility. In Canada, it is a utility, not a regulatory body. Canada In Canada, a public utilities commission (PUC) is a public utility owned and operated by a municipal or local government under the oversight of one or more elected commissioners. It is not a regulatory body. Its role is analogous to a municipal utility district or public utility district in the US. * Brantford Public Utilities Commission * Kitchener Public Utilities Commission Regulatory bodies The utility that is being regulated may be owned by the consumers that it serves, a mutual utility like a public utility district, a state-owned utility, or it may be a stockholder owned utility either publicly traded on a stock exchange or closely held among just a few investors. These utilities often operate as legal monopolies, which means that they do not compete in a marketplace but are instead regulated by commissions to ensure fair pricing. Countries ;Americas * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IEEE
The Institute of Electrical and Electronics Engineers (IEEE) is a 501(c)(3) professional association for electronic engineering and electrical engineering (and associated disciplines) with its corporate office in New York City and its operations center in Piscataway, New Jersey. The mission of the IEEE is ''advancing technology for the benefit of humanity''. The IEEE was formed from the amalgamation of the American Institute of Electrical Engineers and the Institute of Radio Engineers in 1963. Due to its expansion of scope into so many related fields, it is simply referred to by the letters I-E-E-E (pronounced I-triple-E), except on legal business documents. , it is the world's largest association of technical professionals with more than 423,000 members in over 160 countries around the world. Its objectives are the educational and technical advancement of electrical and electronic engineering, telecommunications, computer engineering and similar disciplines. History Origin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynamic Non-Hierarchical Routing
Dynamics (from Greek δυναμικός ''dynamikos'' "powerful", from δύναμις ''dynamis'' " power") or dynamic may refer to: Physics and engineering * Dynamics (mechanics) ** Aerodynamics, the study of the motion of air ** Analytical dynamics, the motion of bodies as induced by external forces ** Brownian dynamics, the occurrence of Langevin dynamics in the motion of particles in solution ** File dynamics, stochastic motion of particles in a channel ** Flight dynamics, the science of aircraft and spacecraft design ** Fluid dynamics or ''hydrodynamics'', the study of fluid flow *** Computational fluid dynamics, a way of studying fluid dynamics using numerical methods ** Fractional dynamics, dynamics with integrations and differentiations of fractional orders ** Molecular dynamics, the study of motion on the molecular level ** Langevin dynamics, a mathematical model for stochastic dynamics ** Orbital dynamics, the study of the motion of rockets and spacecraft ** Quantum ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toll Switching Trunk
In telecommunication, a toll switching trunk or toll connecting trunk is a trunk connecting an end office to a toll center as the first stage of concentration for intertoll or long-distance traffic. Operator assistance or participation may be an optional function. In U.S. common carrier telephony service, a toll center designated ''Class 4C'' is an office where assistance in completing incoming calls is provided in addition to other traffic; a toll center designated ''Class 4P'' is an office where operators handle only outbound calls, or where switching is performed without operator assistance. References * See also * Class-4 telephone switch A class-4, or tandem, telephone switch is a U.S. telephone company central office telephone exchange used to interconnect local exchange carrier offices for long distance communications in the public switched telephone network. A class-4 swi ... Communication circuits Telecommunications economics {{telecomm-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toll Completing Trunks
Toll may refer to: Transportation * Toll (fee) a fee charged for the use of a road or waterway ** Road pricing, the modern practice of charging for road use ** Road toll (historic), the historic practice of charging for road use ** Shadow toll, payments made by government to the private sector operator of a road based on the number of vehicles using the road * Road toll (Australia and New Zealand), term for road death toll, i.e., the number of deaths caused annually by road accidents Brands and enterprises * Toll Brothers, Horsham Township, Pennsylvania based construction company founded by brothers Robert I. Toll and Bruce E. Toll * Toll Collect, a transportation support company in Germany * Toll Group, an Australian transportation company ** Toll Domestic Forwarding, an Australian freight forwarder ** Toll Ipec, Australian transportation company ** Toll Resources & Government Logistics Science * Toll (gene), encode members of the Toll-like receptor class of proteins * Toll- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intelligent Network
The Intelligent Network (IN) is the standard network architecture specified in the ITU-T Q.1200 series recommendations. It is intended for fixed as well as Global System for Mobile Communications, mobile telecommunication, telecom networks. It allows operators to differentiate themselves by providing value-added services in addition to the standard telecom services such as PSTN, ISDN on fixed networks, and GSM services on Mobile phone, mobile phones or other mobile devices. The intelligence is provided by network nodes on the service layer, distinct from the telephone exchange, switching layer of the core network, as opposed to solutions based on intelligence in the core telephone exchange, switches or equipment. The IN nodes are typically owned by telecommunications service providers such as a telephone company or mobile phone operator. IN is supported by the Signaling System 7, Signaling System #7 (SS7) protocol between network switching centers and other network nodes owned by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Service Switching Point
In telephony, a service switching point (SSP) is the telephone exchange that initially responds, when a telephone caller dials a number, by sending a query to a central database called a service control point (SCP) so that the call can be handled. The service switching point uses the Signalling System No. 7 (SS7) protocols which are responsible for the call setup, management, and termination with other service switching points. Relationship between SSP and SCP With the introduction of the Intelligent Network architecture, service functionality (e.g. UK translation of 0800 non-geographic telephone numbers) is being removed from the actual telephone exchange and devolved out into other computer nodes. In this new architecture, the telephone exchange is known as an SSP and the node that contains the services (and hence ''controls'' the progression of a call) is known as service control point (SCP). Example of a 0800 number translation service In the UK 08XXX numbers are non-geogr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
