247 lines
8.8 KiB
Plaintext
247 lines
8.8 KiB
Plaintext
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_ _ _______
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|_||_|etal / /hop
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__________/ /
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/___________/
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(314)432-0756
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Proudly Presents
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The MCI Telecommunications Glossary
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Part I Volume IV (T - W)
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Typed and edited by Knight Lightning
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===============================================================================
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- T -
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T-CARRIER A time-division, pulse modulation, voice
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carrier used on exchange cable to
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provide short-haul trunks.
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TAIL END HOP OFF (TEHO) In a private network, a call which is
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carried over a flat rate facilities
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(Intermachine Trunks or IMT) to the
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closest switch node to the destination
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of the call, and then connected into the
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public network as a local call.
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TANDEM A switching arrangement in which the
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trunk from the calling office is
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connected to a trunk to the called
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office through an intermediate point.
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TANDEM SWITCHING SYSTEM Synonym: Tandem Tie Trunk Network.
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TANDEM TIE TRUNK NETWORK (TTTN) A serving arrangement which permits
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sequential connection of tie trunks
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between PBX/CENTREX locations by
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utilizing tandem operation.
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TANDEM TRUNKING Trunks which connects two or more
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switches together.
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TARIFF The published rates, regulations, and
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descriptions governing the provisions of
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communications service.
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TELCO Local telephone company.
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TELECOMMUNICATIONS The transmission of voice and/or data
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through a medium by means of electrical
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impulses and includes all aspects of
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transmitting information.
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TELEGRAPH A system employing the interruption of,
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or change in, the polarity of DC current
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signaling to convey coded information.
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TELEPHONE A device which converts acoustical
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(sound) energy into electrical energy
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for transmission to a distant point.
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TELETYPEWRITER A machine used to transmit and/or
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receive communications on printed page
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and/or tape.
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TERMINAL (1) The device used at a subscriber's
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location for purposes of communicating,
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such as the telephone instrument,
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teleprinter, computer terminal, etc.,
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(2) The "end point" or extremity" such
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as Terminal Pole of an open wire line,
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or Terminal Office representing the
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final central office in a switching
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network where the subscriber's call
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originates or terminates.
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TERMINAL EQUIPMENT Devices, apparatus, and their associated
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interfaces used to forward information
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to a local customer or a distant
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terminal.
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TERMINATION (1) An item that is connected to the
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terminal of a circuit or equipment.
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(2) An impendance connected to the end
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of a circuit being tested.
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TIE-LINE A private line connecting two PBXs.
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TIME DIVISION MULTIPLEXING (TDM) Equipment which enables the transmitting
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of a number of signals over a single
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path by transmitting them sequentially
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at different instants of time.
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TOLL CALL Any call to a point outside the local
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service area.
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TOLL CENTER (1) A central office where operators
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(human or mechanical) are present to
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assist in completing incoming toll
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calls. (2) A center for the switching of
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toll calls.
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TOLL PLANT The facilities that connect toll offices
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throughout the country.
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TOUCH-TONE ADAPTOR A device that can be connected to a
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rotary dial telephone to allow for DTMF
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signaling.
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TRAFFIC Calls being sent and received over a
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communications network.
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TRAFFIC MEASUREMENT AND RECORDING A computer generated report showing usage
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SYSTEMS (TMRS) usage information of telephone systems.
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Usually this includes trunk utilization,
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outages, queueing time, and the need for
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additional common equipment.
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TRAFFIC SERVICE POSITION SYSTEM A toll switchboard position configured
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(TSPS) as a push button console.
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TRANSMISSION The electrical transfer of a signal,
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mesage or other forms of data from one
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location to another without unacceptable
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loss of information content due to
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attenuation, distortion, or noise.
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TRANSMISSION LEVEL The level of power of a signal normally
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1,000 Hz, which should be measured at a
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particular reference point.
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TRANSMISSION SPEED Number of pulses or bits transmitted in
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a given period of time, usually
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expressed as Bits Per Second (BPS) or
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Words Per Minute (WPM).
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TRUNK A single circuit between two points both
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of which are switching centers and/or
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individual distribution points.
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TRUNK GROUP An arrangement of communications
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channels into an identical group.
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TRUNK TYPE (TT) Trunks that use the same type of
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equipment going to to the same
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terminating location.
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TRUNK UTILIZATION REPORT (TUR) A computer printout detailing the
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traffic use of a trunk.
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TWO-WIRE CIRCUIT 1. A channel for tranamitting data in
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one direction at a time. 2. A short
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distance channel using a single
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send/receive pathway, usually 2 copper
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wires, connecting a telephone to a
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switch.
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TELETYPEWRITER EXCHANGE SERVICE A service whereby a customer's leased
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(TWX) teletypewriter is connected to a "TWX"
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switchboard and from there connected
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over regular toll circuits to
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teletypewriter of any U.S. customer who
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subscribes to a similar service.
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- U -
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UNIFORM CALL DISTRIBUTOR (UCD) A device located at the telephone office
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or in a PABX which distributes incoming
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calls evenly among individuals.
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UNIFORM SERVICE ORDER CODE (USOC) The information in coded form for
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billing purposes by the local telephone
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company pertaining to information on
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service orders and service equipment
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records.
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- V -
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VALUE-ADDED NETWORK SERVICE (VANS) A data transmission network which routes
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messages according to available paths,
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assures that the message will be
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received as it was sent, provides for
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user security, high speed transmission,
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and conferencing among terminals.
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VIA NET LOSS (VNL) The lowest loss in dB at which a trunk
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facility can be operated considering
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limitations of echo, crosstalk, noise,
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and singing.
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VOICE CONNECTING ARRANGEMENT An interface arrangement provided by the
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telephone company to accomodate the
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connections of non-carrier provided
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voice terminal equipment to the public
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switched telephone network.
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VOICE FREQUENCY (VF) Any of the frequencies in the band
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300-3,400 Hz which must be transmitted
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to reproduce the voice with reasonable
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fidelity.
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VOICE GRADE FACILITY (VGF) A circuit designed to DDD network
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standards which is suitable for voice,
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low-speed data, facsimile, or telegraph
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services.
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- W -
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WIDE AREA TELECOMMUNICATIONS A special direct distance dialing (toll)
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SERVICE (WATS) service whereby a subscriber installs a
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dedicated line arranged for either
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inward or outward calls (not both)
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between the customer's premises and a
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specific gepgraphic area.
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WIDEBAND A term applied to facilities or circuits
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where bandwidths are greater than that
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required for one voice channel.
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WIRE CENTER The physical structure that house one or
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more channel office switching systems.
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======================================-========================================
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This concludes Part I Volume IV of the MCI Telecommunications Glossary. Look
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for more G-philes on MCI by Knight Lightning coming soon to Metal Shop.
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This has been a 2600 Club production
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Thanx to Taran King
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Call The Works BBS - 1600+ Textfiles! - [914]/238-8195 - 300/1200 - Always Open
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