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Circuit switched services equipment and providers

Terms related to circuit switched services equipment and providers, including dedicated communications channel definitions and words and phrases about telecommunications.

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  • operational support system (OSS) - An operational support system (OSS) is a set of programs that help a communications service provider monitor, control, analyze and manage a telephone or computer network.
  • out-of-band signaling - Out-of-band signaling is telecommunication signaling (exchange of information in order to control a telephone call) that is done on a channel that is dedicated for the purpose and separate from the channels used for the telephone call.
  • phantom dialing - In mobile wireless communication, phantom dialing is a term used to describe what occurs when a user unintentionally presses a pre-programmed auto-dial number on their cellular telephone keypad and unintentionally initiates a phone call.
  • predictive dialer - A predictive dialer is a telephone control system that automatically calls a list of telephone numbers in sequence, screening out no-answers, busy signals, answering machines and disconnected numbers while predicting at what point a human caller will be able to handle the next call.
  • Premium Rate Service (PRS) - In the U.K.
  • Primary Rate Interface (PRI) - In the Integrated Services Digital Network (ISDN), there are two levels of service: the Basic Rate Interface (BRI), intended for the home and small enterprise, and the Primary Rate Interface (PRI), for larger users.
  • probe - In telecommunications generally, a probe is an action taken or an object used for the purpose of learning something about the state of the network.
  • Q signaling (QSIG) - Q signaling (abbreviated QSIG), a protocol for Integrated Services Digital Network (ISDN) communications based on the Q.
  • Q.931 - Q.931 (also called Q93 is a signaling protocol for Integrated Services Digital Network (ISDN) communications that is used in voice over IP (VoIP).
  • quadbit (nibble) - A quadbit, sometimes called a nibble, is one of 16 possible four-bit combinations used in some communication signals.
  • regional Bell operating company (RBOC) - Regional Bell operating company (RBOC) is a term describing one of the U.
  • repeater - In digital communication systems, a repeater is a device that receives a digital signal on an electromagnetic or optical transmission medium and regenerates the signal along the next leg of the medium.
  • ringback - Ringback is an intermittent audio tone that a caller in a telephone system hears after dialing a number, when the distant end of the circuit is receiving a ringing signal.
  • ringtone - On mobile phones, a ringtone is a brief audio file played to indicate an incoming call.
  • roaming service - Roaming service is the ability to get access to the Internet when away from home at the price of a local call or at a charge considerably less than the regular long-distance charges.
  • RS-232C - RS-232C is a long-established standard ("C" is the current version) that describes the physical interface and protocol for relatively low-speed serial data communication between computers and related devices.
  • S interface - In Integrated Services Digital Network (ISDN) service, an S interface is the electrical interface between a network terminating unit 1 (NT and up to eight addressable devices such as a computer or a telephone.
  • satellite Internet connection - A satellite Internet connection is an arrangement in which the upstream (outgoing) and the downstream (incoming) data are sent from, and arrive at, a computer through a satellite.
  • SDH (Synchronous Digital Hierarchy) - SDH (Synchronous Digital Hierarchy) is a standard technology for synchronous data transmission on optical media.
  • Sequential Couleur avec Memoire (SECAM) - SECAM (Sequential Couleur avec Memoire) is the television display technology that is standard in France, the countries of the former Soviet Union, and certain other countries.
  • service-level agreement (SLA) - A service-level agreement (SLA) is a contract that specifies what the service provider is responsible for.
  • shielded twisted pair - This definition closely duplicates the definition for twisted pair.
  • signal - In electronics, a signal is an electric current or electromagnetic field used to convey data from one place to another.
  • Signal Computing System Architecture (SCSA) - Signal Computing System Architecture (SCSA) is an industry standard architectural framework for the hardware and software components in a computer-telephony integration system.
  • signal-to-noise ratio (S/N or SNR) - In analog and digital communications, signal-to-noise ratio is a measure of signal strength relative to background noise.
  • signaling - In telephony, signaling is the exchange of information between involved points in the network that sets up, controls, and terminates each telephone call.
  • Signaling System 7 (SS7) - Signaling System 7 (SS7) is an international telecommunications standard that defines how network elements in a public switched telephone network (PSTN) exchange information over a digital signaling network.
  • Signalling Connection Control Part (SCCP) - Signalling Connection Control Part (SCCP) is a portion of International Telecommunication Union (ITU) recommendation Q.
  • slamming - Slamming is the practice by some U.
  • splitter - In telephony, a splitter, sometimes called a "plain old telephone service splitter," is a device that divides a telephone signal into two or more signals, each carrying a selected frequency range, and can also reassemble signals from multiple signal sources into a single signal.
  • splitterless - Splitterless refers to a type of Digital Subscriber Line (DSL) telephone service that does not require the installation of a plain old telephone service splitter at the customer location.
  • switched virtual circuit (SVC) - In a network, a switched virtual circuit (SVC) is a temporary virtual circuit that is established and maintained only for the duration of a data transfer session.
  • T-carrier system - To see the relationship between T-carrier, E-carrier, and DS0 multiples, see digital signal X.
  • T1 (T-1) - Also see the T-carrier system, of which the T1 is a part.
  • TAPI (Telephony Application Program Interface) - TAPI (Telephony Application Program Interface) is a standard program interface that lets you and your computer "talk" over telephones or video phones to people or phone-connected resources elsewhere in the world.
  • telco (telephone company) - In the United States and possibly other countries, "telco" is a short form for telephone company.
  • telecenter - A telecenter (US spelling) or telecentre (UK spelling) is a work location usually in a different place than the organization's main office that provides convenient occasional access for telecommuting to work equipment that they don't have at home or on the road.
  • telecom carrier - A telecom carrier is a company that is authorized by regulatory agencies to operate a telecommunications system.
  • Telecommunications Display Device (TDD) - A Telecommunications Display Device (TDD), also known as a text telephone, is a telephone equipped with a keyboard and a display for people who are hearing- or speech-impaired.
  • teleconference - A teleconference is a telephone meeting among two or more participants involving technology more sophisticated than a simple two-way phone connection.
  • telephone jacks - In the U. S.
  • Telephony - Telephony is the technology associated with the electronic transmission of voice, fax, or other information between distant parties using systems historically associated with the telephone, a handheld device containing both a speaker or transmitter and a receiver.
  • terabit - In measuring data transmission speed, a terabit is one trillion binary digit s, or 1,000,000,000,000 (that is, 10 12) bits.
  • terbo - The suffix terbo appears in the V.
  • text on nine keys (T9) - Text on nine keys (T9) is a system that lets fixed and mobile phone users send text messages by pressing a number key for each letter in the message -- effectively making a keyboard out of the nine numeric phone entry keys.
  • time-division multiplexing (TDM) - Time-division multiplexing (TDM) is a method of putting multiple data streams in a single signal by separating the signal into many segments, each having a very short duration.
  • transit - Transit is the connection to and use of a telecommunication path provided by a vendor.
  • trunk - A trunk is a physical path or link in a communications system that interconnects major switching centers or nodes and is designed to handle many transmissions simultaneously.
  • U interface - In Integrated Services Digital Network (ISDN) Basic Rate Interface service, a U interface is the electrical interface for the single twisted pair wire connection from a local phone company (the central office) to a home or business.
  • universal network - The "universal network" is the idea of a single network that integrates the existing voice and public telecommunications network (including the Internet), cable TV, data networks, and video broadcast networks so that they work together well.
  • video telephony - Video telephony is full-duplex, real-time audio-visual communication between or among end users.
  • virtual circuit - A virtual circuit is a circuit or path between points in a network that appears to be a discrete, physical path but is actually a managed pool of circuit resources from which specific circuits are allocated as needed to meet traffic requirements.
  • voice portal (vortal) - A voice portal (sometimes called a vortal) is a Web portal that can be accessed entirely by voice.
  • voice-enabled e-mail (voice-activated e-mail) - Voice-enabled e-mail (sometimes referred to as voice-activated e-mail) uses voice recognition and speech synthesis technologies to enable users to access their e-mail from any telephone.
  • VoIP phone - A VoIP phone is a hardware- or software-based telephone designed to use voice over IP (VoIP) technology to send and receive phone calls over an IP network.
  • VoIP trunk gateway - A VoIP trunk gateway is an interface that facilitates the use of plain old telephone service (POTS) equipment, such as conventional phone sets and fax machines, with a voice over IP (VoIP) network.
  • WATS (wide-area telephone service) - WATS (wide-area telephone service) is a specialized form of fixed-rate long-distance telecommunication service.
  • webtone - Webtone is immediate and continuous access to the Internet in the same way that we think of dialtone when we pick up a phone receiver.
  • wink - In telecommunications, a wink is a signal in the form of a brief interruption in an otherwise continuous signal.

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