PSTN - Public Switched Telephone Network - FREE
PSTN: Abbreviation for public switched telephone network.
public switched telephone network (PSTN): A domestic telecommunications network usually accessed by telephones, key telephone systems, private branch exchange trunks, and data arrangements. Note: Completion of the circuit between the call originator and call receiver in a PSTN requires network signaling in the form of dial pulses or multifrequency tones.
circuit: 1. The complete path between two terminals over which one-way or two-way communications may be provided. 2. An electronic path between two or more points, capable of providing a number of channels. 3. A number of conductors connected together for the purpose of carrying an electrical current. 4. An electronic closed-loop path among two or more points used for signal transfer. 5. A number of electrical components, such as resistors, inductances, capacitors, transistors, and power sources connected together in one or more closed loops. 6. A fully operative communications path established in the normal circuit layout and currently used for message, WATS access, TWX, or private line services. [47 CFR Pt.36-A]
network: 1. An interconnection of three or more communicating entities. 2. An interconnection of usually passive electronic components that performs a specific function (which is usually limited in scope), e.g., to simulate a transmission line or to perform a mathematical function such as integration or differentiation. Note: A network may be part of a larger circuit.
communications: 1. Information transfer, among users or processes, according to agreed conventions. 2. The branch of technology concerned with the representation, transfer, interpretation, and processing of data among persons, places, and machines. Note: The meaning assigned to the data must be preserved during these operations.
information transfer: The process of moving messages containing user information from a source to a sink. Note: The information transfer rate may or may not be equal to the transmission modulation rate.
private branch exchange (PBX): See PBX.
PBX: Abbreviation for private branch exchange. 1. A subscriber-owned telecommunications exchange that usually includes access to the public switched network. 2. A switch that serves a selected group of users and that is subordinate to a switch at a higher level military establishment. 3. A private telephone switchboard that provides on-premises dial service and may provide connections to local and trunked communications networks. Note 1: A PBX operates with only a manual switchboard; a private automatic exchange (PAX) does not have a switchboard, a private automatic branch exchange (PABX) may or may not have a switchboard. Note 2: Use of the term "PBX" is far more common than "PABX," regardless of automation.
data: Representation of facts, concepts, or instructions in a formalized manner suitable for communication, interpretation, or processing by humans or by automatic means. Any representations such as characters or analog quantities to which meaning is or might be assigned. [JP 1-02]
public switched network (PSN): 1. Any common carrier network that provides circuit switching among public users. Note: The term is usually applied to public switched telephone networks, but it could be applied more generally to other switched networks, e.g., packet-switched public data networks. 2. A switched network accessible by the public for the purpose of originating and terminating telecommunications messages. [T1.209-1989] 3. Any common carrier switched network, whether by wire or radio, including local exchange carriers, interexchange carriers, and mobile service providers, that use the North American Numbering Plan in connection with the provision of switched services. [47CFR]
common carrier: In a telecommunications context, a telecommunications company that holds itself out to the public for hire to provide communications transmission services. Note: In the United States, such companies are usually subject to regulation by Federal and state regulatory commissions. Synonyms carrier, commercial carrier, communications common carrier, [and, loosely] interexchange carrier.
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