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Abbreviation for yysecond.
- Browse Related Terms: AC, AMI, app, ATM, B, b/s, basecom, BCI, Bd, BOC, BW, C.O., CAD, CATV, CCS, COG, EO, EOW, ESD, ESF, FC, FEP, FIFO, FILO, FO, MFD, MFJ, MHz, MTA, mw, NA, nmi, Np, NPA, NVIS, OD, OPX, OTAR, PLA, PLS, POT, PPP, RAD, RI, RJ, RO, RQ, RSL, RX, s, sr, STP, SX, THD, TLM, TLP, TRANSEC, TX, uv, VNL, XO, XT
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For basic rate access in an Integrated Services Digital Network (ISDN) environment, a user-to-network interface reference point that (a) is characterized by a 4-wire, 144-kb/s (2B+D) user rate, (b) serves as a universal interface between ISDN terminals or terminal adapters and the network channel termination, (c) allows a variety of terminal types and subscriber networks, such as PBXs, local area networks (LANs), and controllers, to be connected to the network, and (d) operates at 4000 48-bit frames per second, i.e., 192 kb/s, with a user portion of 36 bits per frame, i.e., 144 kb/s.
- 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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The conceptual reference point dividing the TEI (terminal endpoint identifier) and the NT2 (network termination 2) in a particular ISDN access arrangement. [T1.615-1992]
- 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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[A] statement affixed to a computer output or printout that states the highest classification being processed at the time the product was produced and requires control of the product, at that level, until determination of the true classification by an authorized person. Synonym [in INFOSEC] banner. [INFOSEC-99]
- Browse Related Terms: access list, controlled space, eyes only, file security, need to know, overt channel, periods processing, piggyback entry, privileged access, protection ring, safeguarding statement, smart card, tailgate, Trojan horse, user
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Any radiocommunication service used permanently or temporarily for the safeguarding of human life and property. [NTIA] [RR]
- Browse Related Terms: active satellite, aeronautical fixed service, allocation (of a frequency band), allotment (of a radio frequency or radio frequency channel), amateur service, amateur-satellite service, broadcasting service, broadcasting-satellite service, feeder link, fixed service (FX), meteorological aids service, mobile service, mobile-satellite service, radiocommunication service, radiodetermination-satellite service, radiotelegram, radiotelephone call, radiotelex call, safety service, sheath miles, simplex operation, space operation service, space radiocommunication, space research service, space system, space telecommand, space telemetry, special service, standard frequency and time signal service, standard frequency and time signal-satellite service, Station, terrestrial radiocommunication, terrestrial station
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Key intended for off-the-air demonstration use only. [INFOSEC-99]
- Browse Related Terms: common fill device, contingency key, controlling authority, exercise key, maintenance key, one-time cryptosystem, operational key, over-the-air key distribution, protective technologies, randomizer, release prefix, reserve keying material, sample key, seed key, transmission security key (TSK), type 1 product
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Data in which the information content exists only for instantaneous values measured or determined at or for discrete intervals. Note: Sampled data can be analog or digital. [After SMPTE]
- Browse Related Terms: alignment jitter, Allan variance, analog decoding, analog encoding, audio frame, Nyquist interval, Nyquist rate, Nyquist's theorem, pulse-code modulation (PCM), Quantization, reconstructed sample, sampled data, sampling, sampling frequency, sampling interval, Sampling Rate, silence code, variance, video codec
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The reciprocal of the sampling rate, i.e., the interval between corresponding points on two successive sampling pulses of the sampling signal.
- Browse Related Terms: alignment jitter, Allan variance, analog decoding, analog encoding, audio frame, Nyquist interval, Nyquist rate, Nyquist's theorem, pulse-code modulation (PCM), Quantization, reconstructed sample, sampled data, sampling, sampling frequency, sampling interval, Sampling Rate, silence code, variance, video codec
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The number of samples taken per unit time, i.e., the rate at which signals are sampled for subsequent use, such as for modulation, coding, and quantization. Deprecated synonym sampling frequency.
- Browse Related Terms: alignment jitter, Allan variance, analog decoding, analog encoding, audio frame, Nyquist interval, Nyquist rate, Nyquist's theorem, pulse-code modulation (PCM), Quantization, reconstructed sample, sampled data, sampling, sampling frequency, sampling interval, Sampling Rate, silence code, variance, video codec
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Synonym Nyquist's theorem.
- Browse Related Terms: access unit interface, bridge transformer, closure, exploder, flash memory card, FM capture effect, FM capture ratio, network interface unit (NIU), nodal point, overload point, peripheral node, sampling theorem, utility load
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[In INFOSEC, the] process to remove information from media such that data recovery is not possible. It includes removing all classified labels, markings, and activity logs. [INFOSEC-99]
- Browse Related Terms: certificate management, encryption algorithm, erasure, fail soft, failure control, overwrite procedure, purging, sanitize, speech privacy
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Of a recording medium, erasing or overwriting all data in such a manner that it cannot be recovered, even by extraordinary, e.g., laboratory, means. Note: Sanitizing is distinguished from simply "deleting" or "erasing" data. For example, a software-based deletion command may simply mark a file or block of data to the effect that it may be overwritten during a subsequent "save" of different data. Until such a save is performed, the deleted data may be recovered, sometimes by the simple expedient of executing a software command. Likewise, digital data, for example, may be "erased," from a magnetic recording medium, but still be recoverable if subjected to laboratory techniques that can identify residual magnetism left after the erasure.
- Browse Related Terms: contribution, PIN, post-production processing, sanitizing, zeroized
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A radio relay station that orbits the earth. A complete satellite communications system also includes earth stations that communicate with each other via the satellite. The satellite receives a signal transmitted by an originating earth station and retransmits that signal to the destination earth station(s). Satellites are used to transmit telephone, television and data signals originated by common carriers, broadcasters and distributors of cable TV program material.
A body which revolves around another body of preponderant mass and which has a motion primarily and permanently determined by the force of attraction of that other body. [NTIA] [RR] Note: A parent body and its satellite revolve about their common center of gravity.
- Browse Related Terms: communications subsystem, Direct Broadcast Satellite (DBS/DISH), fixed-satellite service, meteorological-satellite service, multi-satellite link, orbit, passive sensor, Satellite, satellite communications, satellite digital audio radio service (SDARS), satellite link, satellite network, satellite system, underground cable, uplink (U/L), view
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In satellite communications systems, the establishment of contact with a communications satellite space station. Note: An example of satellite access is access at the moment at which an Earth station commences to use a satellite space station as a signal repeater, i.e., to use its transponder. Each radio frequency (rf) carrier that is relayed by a satellite space station at any time occupies an access channel. Accesses, i.e., channels, are distinguishable by various system parameters, such as frequency, time, or code. [From Weik '89]
- Browse Related Terms: airborne radio relay, anycall, calling frequency, conference call, connectivity exchange (CONEX), net radio interface (NRI), preliminary call, Priority, query call, satellite access, selcall
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A telecommunications service provided via one or more satellite relays and their associated uplinks and downlinks.
- Browse Related Terms: communications subsystem, Direct Broadcast Satellite (DBS/DISH), fixed-satellite service, meteorological-satellite service, multi-satellite link, orbit, passive sensor, Satellite, satellite communications, satellite digital audio radio service (SDARS), satellite link, satellite network, satellite system, underground cable, uplink (U/L), view
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A satellite-based direct-broadcast radio service in which digitally encoded audio entertainment material is broadcast to Earth-based receivers, either directly from an orbiting satellite, or--in cases in which the receiver is in a shielded location--from the satellite to the receiver via a repeater station. 2. A radiocommunication service in which audio programming is digitally transmitted by one or more space stations directly to fixed, mobile, and/or portable stations, and which may involve complementary repeating terrestrial transmitters, telemetry, tracking and control facilities. [47CFR] 3. A radiocommunication service in which compact-disc quality programming is digitally transmitted by one or more space stations. [47CFR]
- Browse Related Terms: communications subsystem, Direct Broadcast Satellite (DBS/DISH), fixed-satellite service, meteorological-satellite service, multi-satellite link, orbit, passive sensor, Satellite, satellite communications, satellite digital audio radio service (SDARS), satellite link, satellite network, satellite system, underground cable, uplink (U/L), view