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For basic-rate access in an Integrated Services Digital Network (ISDN) environment, a user-to-network interface reference point that is characterized by the use of a 2-wire-loop transmission system that (a) conveys information between the 4-wire user-to-network interface, i.e., the S/T reference point, and the local exchange, (b) is located in the servicing central office, and (c) is not as distance sensitive as a service using a T interface.
- Browse Related Terms: basic rate interface (BRI), broadband ISDN (B-ISDN), operator service access point (OSAP), operator services, synchronous transfer mode, T reference point, transfer mode, U interface, Wide area network (WAN)
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The conceptual reference point at the network side of the network termination 1 (NT1) in a particular ISDN access arrangement. [T1.615-1992] [T1.105-1988]
- Browse Related Terms: attachment unit interface (AUI), medium interface connector (MIC), medium interface point (MIP), message register leads, originating connection, R interface, S interface, S reference point, T-interface, terminal adapter, Trunk Gateway, U reference point, V reference point, wireline access mode
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Abbreviation for user datagram protocol. An Internet protocol for datagram service.
- Browse Related Terms: content label, mail reflector, newsfeed, Portal, UDP, Virtual Domain, Web site, Web television
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Frequencies from 300 MHz to 3000 MHz. See electromagnetic spectrum.
- Browse Related Terms: extremely high frequency (EHF), Extremely low frequency (ELF), medium frequency (MF), optical spectrum, Spectrum, spectrum designation of frequency, super high frequency (SHF), tremendously high frequency (THF), Ultra High Frequency (UHF), ultra low frequency (ULF), ultraviolet (uv), very low frequency (VLF), visible spectrum
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Frequencies from 300 Hz to 3000 Hz. See electromagnetic spectrum.
- Browse Related Terms: extremely high frequency (EHF), Extremely low frequency (ELF), medium frequency (MF), optical spectrum, Spectrum, spectrum designation of frequency, super high frequency (SHF), tremendously high frequency (THF), Ultra High Frequency (UHF), ultra low frequency (ULF), ultraviolet (uv), very low frequency (VLF), visible spectrum
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The portion of the electromagnetic spectrum in which the longest wavelength is just below the visible spectrum, extending from approximately 4 nm to approximately 400 nm. Note: Some authorities place the lower limit of uv at values between 1 and 40 nm, 1 nm being the upper wavelength limit of x-rays. The 400-nm limit is the lowest visible wavelength, i.e., the highest visible frequency, violet. See electromagnetic spectrum.
- Browse Related Terms: extremely high frequency (EHF), Extremely low frequency (ELF), medium frequency (MF), optical spectrum, Spectrum, spectrum designation of frequency, super high frequency (SHF), tremendously high frequency (THF), Ultra High Frequency (UHF), ultra low frequency (ULF), ultraviolet (uv), very low frequency (VLF), visible spectrum
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See UWB.
- Browse Related Terms: acquisition and tracking orderwire, amplitude hit, basic group, certificate revocation list, channel supergroup, Extensible Markup Language, mastergroup, multicast backbone (Mbone), Network File System (NFS), packet Internet groper, personal identification number, phase hit, picowatt, primary group, push-down file, radio frequency, secure voice cord board, selective calling, self-electro-optic effect device, spike file, squatting, ultrawideband, usable line length, voice-operated device anti-sing, webzine
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Synonym illegal character.
- Browse Related Terms: bang, forbidden character, unallowable character, unused character
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A cell identified by a standardized virtual path identifier (VPI) and virtual channel identifier (VCI) value, which has been generated and does not carry information from an application using the ATM Layer service. [T1.627-1993]
- Browse Related Terms: asynchronous transfer mode (ATM), ATM (asynchronous transfer mode) connection, ATM (asynchronous transfer mode) layer connection, ATM link (asynchronous transfer mode link), cell delay variation, cell delineation, overlay cell, unassigned cell, virtual channel (VC), virtual channel connection (VCC), virtual channel link (VCL)
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Exposure of information to individuals not authorized to receive it. [INFOSEC-99]
- Browse Related Terms: anti-jam, authentication system, Biometrics, call back, challenge and reply authentication, communications cover, compromising emanations, entrapment, Exposure, positive control material, Probe, sub-registration authority (SRA), suppression measure, susceptibility threshold, unauthorized disclosure, User-ID
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A expression of the degree to which a system, subsystem, or equipment is not operable and not in a committable state at the start of a mission, when the mission is called for at an unknown, i.e., random, time. Note 1: The conditions determining operability and committability must be specified. Note 2: Expressed mathematically, unavailability is 1 minus the availability. Note 3: Unavailability may also be expressed mathematically as the ratio of the total time a functional unit is not capable of being used during a given interval to the length of the interval, e.g., if the unit is not capable of being used for 68 hours a week, the unavailability is 68/168.
- Browse Related Terms: access path, arithmetic unit, clock free-run mode, communications net operation, error signal, fail-safe operation, flops, mudbox, nontechnical load, octet, preset jammer, priority message, proprietary standard, RBOC, separations, slip-free operation, technical load, tracking mode, transparent interface, unavailability, undesired signal
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A transmission line, such as a coaxial cable, in which the magnitudes of the voltages on the two conductors are not equal with respect to ground.
- Browse Related Terms: air-spaced coaxial cable, equivalent gauge, field wire, fortuitous conductor, metallic circuit, metallic voltage, open wire, rope lay conductor, slope equalizer, symmetrical pair, T1 line, unbalanced line, voltage rating, wireline
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A modulator in which the modulation factor is different for the alternate half-cycles of the carrier. Synonym asymmetrical modulator.
- Browse Related Terms: Pulse Repetition Frequency (PRF), pulse string, pulse train, pulse-repetition-rate modulation, regenerator, sync pulse, unbalanced modulator
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A circuit in which the two sides are inherently electrically dissimilar.
- Browse Related Terms: balanced, charge coupled device (CCD), optical beamsplitter, serializer, staticizer, unbalanced wire circuit
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Synonym radiation mode.
- Browse Related Terms: equilibrium mode power distribution, mode mixer, monomode optical fiber, multimode group delay, scan line, single-mode fiber, single-mode optical waveguide, trapped mode, tunneling mode, unbound mode, unimode fiber
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In the context of the FCC's Computer III Inquiry, the process of separating individual tariffed offerings and services that are associated with a specific element in the CEI or ONA tariff from other tariffed basic service offerings. [After para. 158, FCC Report and Order, June 16, 1986.]
The term used to describe the access provided by local exchange carriers so that other service providers can buy or lease portions of its network elements, such as interconnection loops, to serve subscribers.
- Browse Related Terms: Aging Numbers:, Assigned Numbers:, central office prefix, comparably efficient interconnection (CEI), Federal Communications Commission, open network architecture (ONA), Reserved Numbers, shared service link connection, Toll Free Number Portability, unbundling
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Information that has not been determined pursuant to Executive Order (E.O.) 12958 or any predecessor order to require protection against unauthorized disclosure and that is not designated as classified. [INFOSEC-99]
- Browse Related Terms: active threat, automated information systems security, classification, Compromise, computer abuse, file protection, national security information (NSI), network security, operational data security, operations security, passive threat, penetration, security, security classification, sensitive information, tampering, Threat, unclassified
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In computing, a condition occurring when a machine calculation produces a non-zero result that is smaller than the smallest non-zero quantity that the machine's storage unit is capable of storing or representing.
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