Telecommunications terms starting with T

499 terms

telephone exchange Synonym central office.
telephone frequency See audio frequency, voice frequency.
telephone number The unique network address that is assigned to a telephone user, i.e., subscriber, for routing telephone calls.
telephone sidetone Synonym sidetone.
telephony Converting sounds into electronic signals for transmission.
telephoto Pertaining to pictures transmitted via a telecommunications system.
teleprinter A teletypewriter that can only receive data and does not have a keyboard for transmission.
Teleprocessing The combining of telecommunications and computer operations interacting in the automatic processing, reception, and transmission of data and/or…
teleseminar See teletraining.
teleservice See telecommunications service.
teletex An international store-and-forward essentially error-free communications service that is defined by the CCITT (now the ITU-T), has a data signaling rate…
teletext A type of one-way information service in which a subscriber can receive data on a video display.
teletraining Training that (a) in which usually live instruction is conveyed in real time via telecommunications facilities, (b) that may be accomplished on a…
teletypewriter (TTY) A printing telegraph instrument that has a signal-actuated mechanism for automatically printing received messages.
teletypewriter control unit (TCU) A device that controls and coordinates operations between teletypewriters and message switching centers.
teletypewriter exchange service (TWX) A switched teletypewriter service in which suitably arranged teletypewriter stations are provided with lines to a central office for access to other such…
teletypewriter signal distortion The shifting of signal pulse transitions from their proper positions relative to the beginning of the start pulse.
television (TV) A form of telecommunication for the transmission of transient images of fixed or moving objects.
television broadcast translator See translator.
Telex® A communication service involving teletypewriters connected through automatic exchanges.
Telnet Method used to gain remote access to a UNIX Web server.
TEM Abbreviation for transverse electric and magnetic mode.
TEMPEST TEMPEST is an unclassified short name referring to investigation and studies of compromising emanations.
temporal application A video application requiring high temporal resolution, i.e., reduced jerkiness, possibly at the expense of reduced spatial resolution.
temporal coherence See coherent.
temporal edge noise In a video display, that form of edge busyness that is characterized by time-varying sharpness at the edges of objects.
temporally coherent radiation See coherence time.
Temporary Local Directory Number (TLDN): A number dynamically assigned on a per call basis by the serving wireless service provider to a roaming subscriber for the purpose of incoming call setup.
terahertz (THz) A unit denoting one trillion (1012) hertz.
terminal A device, usually a display monitor and a keyboard, used to communicate with the computer.
terminal access controller (TAC) A host computer that accepts terminal connections, usually from dial-up lines, and that allows the user to invoke Internet remote log-on procedures, such…
terminal adapter An interfacing device employed at the "R" reference point in an ISDN environment that allows connection of a non-ISDN terminal at the physical layer to…
terminal data Data maintained for each terminal including the current terminal location (and capabilities). [T1.244-1995]
terminal deregistration The process by which a wireless terminal's previous location registration is canceled. [T1.702-1995] [T1.Rpt34-1994]
terminal endpoint (TE) functional group A functional group that includes functions broadly belonging to Layer 1 and higher layers of the ITU-T Recommendation X.200 Reference Model.
terminal equipment Communications equipment at either end of a communications link, used to permit the stations involved to accomplish the mission for which the link was…
terminal identifier A code identifying a specific terminal. [T1.Rpt34-1994]
terminal impedance The impedance as measured at the unloaded output terminals of transmission equipment or a line that is otherwise in normal operating condition. 2.
terminal mobility In commercial wireless networks, the ability of a terminal, while in motion, to access telecommunication services from different locations, and the…
terminal mobility controller A device that provides the control logic for terminal authentication, location management, alerting, and routing to radio personal terminal / radio…
terminal mobility management In personal communications service (PCS), (a) providing authentication of terminal information, (b) maintaining terminal location and capability…
terminal registration The process of associating a terminal with a terminal registration area. [T1.Rpt34-1994]
terminal registration area A territory in which a wireless terminal is registered for terminal mobility. Note: For T1 Technical Report 34, the alerting area may or may not be…
terminal service profile (TSP) Information that the service provider maintains for a given user to characterize the services offered by the network to that user.
terminal type The variety of terminal or the originator (e.g., dual-tone multifrequency (DTMF) phone, ISDN terminal). [After T1.667-1999]
terminating endpoint In a wideband packet node, the part of the node that receives packetized traffic, depacketizes it, and then plays it back as channelized traffic. [T1.
terminating network function Of a UPT call, any network function associated with the termination of the call to the destination terminal. [After T1.Rpt41-1995]
Termination A Reporting Status for an employee who is leaving a covered position that requires the filer to file an SF 278.
terminus A device used to terminate, position, and hold an optical fiber within a connector.
ternary signal A signal that can assume, at any given instant, one of three significant conditions, such as power level, phase position, pulse duration, or frequency.
terrestrial radiocommunication Any radiocommunication other than space radiocommunication or radio astronomy. [NTIA] [RR] [47CFR]
terrestrial station A station effecting terrestrial radiocommunication. [47CFR] In these [Radio] Regulations, unless otherwise stated, any station is a terrestrial station.
test and validation Physical measurements taken (a) to verify conclusions obtained from mathematical modeling and analysis or (b) for the purpose of developing mathematical…
test antenna An antenna of known performance characteristics used in determining transmission characteristics of equipment and associated propagation paths.
test center See patch and test facility, technical control facility.
test key Key intended for testing of COMSEC equipment or systems. [INFOSEC-99]
test point A point within a piece of equipment or an equipment string that provides access to signals for the purpose of fault isolation.
test tone A tone sent at a predetermined level and frequency through a transmission system for test purposes, such as for facilitating measurements and for aligning…
Testline Coordinator The contact person who coordinates the updating and distribution of testline information for their company and is responsible for providing testline…
text processing Synonym word processing.
TG (1) Threat Generator. (2) Trajectory Generator.
TGM Abbreviation for trunk group multiplexer.
THD Abbreviation for total harmonic distortion.
thermal noise The noise generated by thermal agitation of electrons in a conductor. The noise power, P, in watts, is given by P = kTf, where k is Boltzmann's constant…
Thermal Radiation Electromagnetic radiation emitted (in two pulses from a nuclear air burst) from the fireball as a consequence of its very high temperature; it consists…
thermodynamic temperature A measure, in kelvins (K), proportional to the thermal energy of a given body at equilibrium.
THF Abbreviation for tremendously high frequency. See electromagnetic spectrum.
thin client (computing) A server-centric computing model in which the application software, data, and CPU power resides on a network server rather than on the client computer(s).
thin-client software Computer programs that reside on a server and react to external requests from a client.
thin-film laser A laser that is constructed by thin-film deposition techniques on a substrate for use as a light source, is usually used to drive thin-film optical…
thin-film optical modulator A modulator that consists of multilayered films of material of different optical characteristics, is capable of modulating transmitted light by using…
thin-film optical multiplexer A multiplexer that consists of multilayered films of material of different optical characteristics, is capable of multiplexing transmitted light by using…
thin-film optical switch A switch that consists of multilayered films of material of different optical characteristics, that is capable of switching transmitted light by using…
thin-film optical waveguide A slab-dielectric waveguide that consists of multilayered films of material of different optical characteristics, is capable of guiding an optical signal…
third window Of silica-based optical fibers, the transmission window at approximately 1.55 m. Note: The third window is the minimum-loss window in silica-based fibers.
third-order intercept point A point (a) that is an extrapolated convergence--not directly measurable--of intermodulation distortion products in the desired output and (b) that…
Thousand-Block (NXX-X) Number Pooling: Thousands-block number pooling is a process by which the 10,000 numbers in a central office code (NXX) are separated into ten sequential blocks of 1,000…
Thousands-block A range of one thousand telephone numbers within an NPA-NXX beginning with X000 and ending with X999, where X is a value from 0 to 9.
thread A series of postings on a particular topic. Threads can be a series of bulletin board messages (for example, when someone posts a question and others…
Threat Related to Aggro. This is what a character "gives off" to generate or draw monster aggro.
Threat Analysis The examination of threat sources against system vulnerabilities to determine the threats for a particular system in a particular operational environment.
Threat Assessment Formal description and evaluation of threat to an information system.
three-bit byte Synonym triplet.
three-way calling A switching system service feature that permits users to add a third party at a different number during a call, without the assistance of an attendant.
Threshold the point a system must cross to enter a new state or condition.
threshold current In a laser, the driving current corresponding to lasing threshold.
threshold extension See FM threshold extension.
threshold frequency In opto-electronics, the frequency of incident radiant energy below which there is no photo-emissive effect.
through group A group of 12 voice-frequency channels transmitted as a unit through a carrier system.
through supergroup An aggregate of 60 voice-frequency channels, i.e., five groups, transmitted as a unit through a carrier system.
through-group equipment In carrier telephone transmission, equipment that accepts the signal from a group receiver output and attenuates it to the proper signal level for…
through-supergroup equipment In carrier telephone transmission, equipment that accepts the multiplexed signal from a supergroup receiver output, amplifies it without frequency…
Throughput A term used to describe the amount of data which can be processed by a system in a given amount of time.
THz Abbreviation for terahertz. See electromagnetic spectrum.
TIA Abbreviation for Telecommunications Industry Association. See EIA interface.
Ticket A text message that is submitted to the GMs via the in-game system and is waiting for GM response.
ticket-oriented [In security, a] computer protection system in which each subject maintains a list of unforgeable bit patterns called tickets, one for each object a…
ticketed call A call for which a record is made of certain facts concerning the call, such as the time it was placed, the duration, the call originator, call…
TIE this is where neither the house nor the player wins.
tie line See tie trunk.