Encyclopedia > Glossary of Telecommunication Terms
Federal Standard 1037C
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This document provides Federal departments and agencies a comprehensive source of definitions of terms used in telecommunications and directly related fields by international and U.S. Government telecommunications specialists.
As a publication of the US Government, prepared by an agency of the US Government, it appears to be mostly available as a public domain resource. Note: A few items are derived from copyrighted sources: where this is the case, there is an attribution to the source.
A substantial number of non-trivial 1037C articles are now incorporated into Wikipedia -- please note that only those articles
- from 100% public domain sources, and
- with substantial content
Note: please do not copy any definitions from Federal Standard 1037C with attribution to Non-Federal sources such as NATO, CCITT, the Radio Regulations etc. as these are derived from sources not known to be in the public domain.
Instead, please write your own definitions for these terms in your own original words.
List of telecommunications terms defined in Federal Standard 1037C
ADP/AIS/MIS
automated information system (AIS) -- automatic data handling[?] (ADH) -- automatic data processing (ADP) -- automatic data processing equipment (ADPE) -- batch processing -- clearing -- fetch protection[?] -- FIP equipment[?] -- hardware -- information -- information system -- machine-independent[?] -- management information system[?] (MIS) -- man-machine system[?] -- online computer system[?] -- parallel processing -- penetration -- recovery procedure -- remote access data processing[?] -- remote batch entry[?] -- remote batch processing[?] -- remote job entry[?] (RJE) -- remote operations service element protocol (ROSE) -- security filter[?] -- security kernel -- standby -- system administration[?] -- system analysis -- system documentation[?] -- system integration[?] -- system integrity -- system management[?] -- systems design -- technical vulnerability[?] -- trusted computing base (TCB) -- trusted computer system[?] (TCS) -- user -- validation -- work station
Antennas
Glossary of antenna terms
Codes/Coding
Glossary of coding terms
Computer Graphics
Glossary of computer graphics terms
Computer Hardware
Glossary of computer hardware terms
Computer Programming/Languages/Software
Glossary of computer programming terms
Control/Control Characters/Command/Error Correction/Handshaking
acknowledge character[?] (ACK) -- ARQ -- backward channel -- backward signal[?] -- backward supervision[?] -- BCH code -- block check[?] -- block parity[?] -- call control character[?] -- call control signal[?] -- cancel character (CAN) -- carrier sense multiple access[?] (CSMA) -- channel bits[?] -- character -- character check[?] -- character interval -- check bit[?] -- check character[?] -- check digit[?] -- checksum -- clear confirmation signal[?] -- command -- command frame[?] -- command menu -- command protocol data unit[?] -- common-channel signaling[?] -- connection-in-progress signal[?] -- control character -- control communications -- control operation -- convolutional code -- cyclic redundancy check (CRC) -- data link escape character[?] (DLE) -- data transfer request signal[?] -- DCE clear signal[?] -- DCE waiting signal[?] -- delimiter[?] -- disabling tone[?] -- end-of-medium character[?] -- end-of-selection character[?] -- end-of-text character[?] (ETX) -- end-of-transmission-block character[?] (ETB) -- end-of-transmission character (EOT) -- enquiry character[?] (ENQ) -- error control -- error-correcting code -- error-correcting system[?] -- error-detecting code[?] -- error-detecting system -- flag -- forward error correction (FEC) -- Hagelbarger code -- Hamming code -- handshaking -- idle character[?] -- longitudinal redundancy check (LRC) -- negative-acknowledge character (NAK) -- nontransparent mode[?] -- overhead information -- password -- pilot -- process computer system[?] -- process control[?] -- process control equipment[?] -- process control system[?] -- ready-for-data signal[?] -- redundancy -- redundancy check -- residual error ratio[?] -- respond opportunity[?] -- response -- Shannon's law -- source quench[?] -- start signal -- substitute character[?] (SUB) -- summation check -- synchronous idle character[?] (SYN) -- transverse parity check[?] -- undetected error ratio[?] -- who-are-you character[?] (WRU)
Distortion/Dispersion/Diffraction
amplitude distortion -- amplitude-vs.-frequency distortion[?] -- bias distortion -- characteristic distortion[?] -- cyclic distortion[?] -- degree of isochronous distortion -- degree of start-stop distortion -- delay distortion[?] -- diffraction -- dispersion -- dispersion-limited operation -- distortion -- distortion-limited operation -- end distortion -- feeder echo noise[?] -- fortuitous distortion[?] -- harmonic distortion[?] -- intermodulation distortion -- intramodal distortion[?] -- isochronous distortion[?] -- knife-edge effect -- margin -- multimode distortion[?] -- nonlinear distortion[?] -- phase-frequency distortion[?] -- quantizing distortion[?] -- signal droop[?] -- single-harmonic distortion[?] -- start-stop distortion[?] -- total harmonic distortion (THD)
Encryption/Decryption
Glossary of telecommunications encryption terms
Facsimile
Glossary of fax terms
Fiber Optics
Glossary of fiber optic terms
Filters
Glossary of filter terms
Frequency
aircraft emergency frequency[?] -- automatic frequency control[?] (AFC) -- band -- bandwidth (BW) -- barrage jamming -- baseband -- calling frequency[?] -- carrier frequency -- channel offset[?] -- characteristic frequency[?] -- cutoff frequency -- extremely high frequency[?] (EHF) -- extremely low frequency[?] (ELF) -- frequency -- guarded frequency[?] -- heterodyne -- high frequency[?] -- hiss[?] -- hold-in frequency range[?] -- image frequency -- image rejection ratio -- insertion-loss-vs.-frequency characteristic[?] -- intermediate frequency (IF) -- intermodulation product -- lock-in frequency[?] -- lock-in range[?] -- lowest usable high frequency[?] (LUF) -- low frequency[?] (LF) -- maximum keying frequency[?] -- maximum modulating frequency[?] -- maximum usable frequency (MUF) -- medium frequency[?] (MF) -- military common emergency frequency[?] -- natural frequency[?] -- nominal bandwidth[?] -- normalized frequency (V) -- notch[?] -- occupied bandwidth[?] -- precise frequency[?] -- preemphasis -- primary frequency[?] -- primary frequency standard[?] -- primary service area -- priority -- protected frequency[?] -- pull-in frequency range[?] -- pulse repetition rate[?] -- pump frequency[?] -- quartz oscillator[?] -- radio channel[?] -- radio frequency (rf) -- radio wave -- Rayleigh distribution -- reference frequency[?] -- secondary frequency standard -- sideband -- single-frequency signaling (SF) -- single-tone interference[?] -- slewing[?] -- spectral density -- spectrum signature[?] -- spread spectrum -- spurious emission[?] -- standard test tone -- standard time and frequency signal service (STFS) -- stereophonic sound subcarrier[?] -- stopband -- syntonization[?] -- threshold frequency[?] -- transition frequency[?] -- ultra high frequency (UHF) -- ultra low frequency[?] (ULF) -- very high frequency (VHF) -- very low frequency[?] (VLF) -- virtual carrier frequency[?] -- voice frequency (VF) -- wideband[?]
Frequency Allocation/Assignment
allocation (of a frequency band) -- allotment (of a radio frequency or radio frequency channel)[?] -- assigned frequency[?] -- assigned frequency band[?] -- assignment[?] (of a radio frequency or radio frequency channel) -- authorized bandwidth[?] -- authorized frequency[?] -- C-Band -- frequency assignment -- frequency assignment authority
Gain
absolute gain -- antenna gain -- antenna gain-to-noise-temperature[?] (G/T) -- automatic gain control[?] (AGC) -- directive gain -- diversity gain[?] -- equal gain combiner[?] -- fade margin -- gain -- gain medium[?] -- height gain[?] -- insertion gain -- loop gain -- net gain -- process gain -- signal processing gain -- singing margin[?] -- singing point[?]
Interfacing
cell relay -- data station[?] -- data transmission circuit -- demarcation point (demarc) -- dial mode[?] -- DTE clear signal[?] -- EIA interface -- framed interface[?] -- gateway -- interchange circuit -- interexchange carrier (IXC) -- interface -- interface functionality -- interface message processor[?] (IMP) -- interface payload[?] -- interface standard -- medium interface point[?] (MIP) -- net radio interface[?] (NRI) -- network interface -- network interface device (NID) -- network termination 1 (NT1) -- network termination 2[?] (NT2) -- optical interface[?] -- point of interface[?] (POI) -- point of presence[?] (POP) -- POSIX -- primary rate interface (PRI) -- protocol translator[?] -- R interface[?] -- router -- service -- service access point[?] (SAP) -- service data unit[?] (SDU) -- S interface -- terminal adapter -- T-interface -- transparent interface[?] -- T reference point[?] -- U interface -- V reference point[?]
Interference
adjacent-channel interference -- anti-interference[?] -- blanketing -- co-channel interference -- common-mode interference -- common-mode rejection ratio[?] (CMRR) -- compatibility -- conducted interference -- differential mode interference[?] -- electromagnetic interference (EMI) -- eye pattern -- far-end crosstalk[?] -- FM blanketing -- harmful interference[?] -- interaction crosstalk[?] -- interference -- interference emission[?] -- interference filter -- intersymbol interference -- jamming margin[?] -- jamming to signal ratio[?] (J/S) -- limits of interference[?] -- optical interface[?] -- permissible interference[?] -- phase interference fading -- precipitation static[?] (p-static) -- reradiation -- single-frequency interference[?] -- single-tone interference[?] -- sunspot -- white area[?]
Internet
Archie -- browser -- directed broadcast address[?] -- Domain Name System (DNS) -- Gopher -- ICMP -- The Internet -- Internet protocol (IP) -- Internet protocol spoofing (IP) -- lynx -- Mosaic -- SLIP -- TCP -- TCP/IP -- TCP/IP Suite -- Terminal Access Controller[?] (TAC) -- User Datagram Protocol (UDP) -- web browser -- World Wide Web (WWW)
Loss/Attenuation
absorption -- absorption band[?] -- absorption coefficient[?] -- absorption index[?] -- absorption loss[?] -- angular misalignment loss -- antenna dissipative loss[?] -- area loss[?] -- attenuation -- attenuation coefficient[?] -- attenuation constant -- attenuation-limited operation[?] -- attenuator -- bridging loss -- cloud attenuation[?] -- coupling loss[?] -- cutoff attenuator[?] -- differential mode attenuation[?] -- flat fading[?] -- free-space loss -- gap loss[?] -- gap-loss attenuator[?] -- insertion loss -- insertion-loss-vs.-frequency characteristic[?] -- lateral offset loss[?] -- loss -- lossy medium[?] -- macrobend loss[?] -- modal loss[?] -- net loss[?] -- net loss variation[?] -- numerical aperture loss[?] -- path loss -- precipitation attenuation[?] -- preemphasis -- proration -- reflection loss -- return loss -- scattering loss[?] -- selective fading[?] -- shadow loss -- splice loss[?] -- transmission loss[?] -- via net loss[?] (VNL)
Modems
AT Commands -- modem -- modem patch[?] -- narrowband modem -- wideband modem
Modulation
absorption modulation[?] -- adaptive differential pulse-code modulation[?] (ADPCM) -- amplitude modulation (AM) -- angle modulation -- bandwidth (BW) -- baseband -- baseband modulation[?] -- binary modulation[?] -- bit-by-bit asynchronous operation[?] -- carrier shift -- center frequency[?] -- chip rate[?] -- chirping -- code-division multiple access (CDMA) -- coherent differential phase-shift keying (CDPSK) -- conditioned diphase modulation[?] -- continuously variable slope delta modulation[?] (CVSD) -- Costas loop -- cross modulation[?] -- delta modulation (DM) -- delta-sigma modulation[?] -- demand assignment multiple access[?] (DAMA) -- demodulation -- differential modulation[?] -- differential phase-shift keying[?] (DPSK) -- differential pulse-code modulation[?] (DPCM) -- digital frequency modulation[?] -- digital modulation[?] -- digital phase modulation[?] -- direct-sequence modulation[?] -- disparity[?] -- double modulation[?] -- electro-optic modulator -- exalted-carrier reception[?] -- fixed-reference modulation[?] -- frequency modulation (FM) -- frequency-shift keying (FSK) -- full modulation[?] -- incremental phase modulation[?] (IPM) -- indirect control[?] -- intensity modulation (IM) -- isochronous demodulation[?] -- isochronous modulation[?] -- keying -- load capacity[?] -- low-level modulation[?] -- maximum modulating frequency[?] -- mechanically induced modulation -- modulation -- multicarrier modulation[?] (MCM) -- overmodulation -- percentage modulation[?] -- phase deviation[?] -- phase modulation (PM) -- phase-shift keying (PSK) -- preemphasis improvement -- preemphasis network -- pseudorandom noise -- pulse-amplitude modulation (PAM) -- pulse-code modulation (PCM) -- pulse-duration modulation[?] (PDM) -- pulse-frequency modulation[?] (PFM) -- pulse-position modulation (PPM) -- quadrature amplitude modulation (QAM) -- quadrature modulation[?] -- quadrature phase-shift keying (QPSK) -- quantization -- quasi-analog transmission[?] -- radio -- reduced carrier single-sideband emission[?] -- reduced carrier transmission[?] -- signal transition -- significant condition -- single-sideband emission (SSB) -- single-sideband equipment reference level[?] (SSB) -- single-sideband suppressed carrier transmission[?] (SSB-SC) -- start-stop margin[?] -- start-stop modulation[?] -- stereophonic crosstalk[?] -- sub-band adaptive differential pulse code modulation[?] (SB-ADPCM) -- subcarrier[?] -- supergroup distribution frame[?] (SGDF) -- suppressed carrier transmission -- thin-film optical modulator[?] -- unbalanced modulator[?] -- vestigial sideband transmission[?] (VSB) -- white facsimile transmission
Multiplexing
asynchronous time-division multiplexing[?] (ATDM) -- asynchronous transfer mode (ATM) -- carrier system -- cell relay -- channel bank[?] -- common-channel interoffice signaling[?] (CCIS) -- demultiplexing[?] -- D-4 -- digital multiplexer[?] -- digital multiplex hierarchy -- digital signal (DS) -- digroup -- drop and insert -- erect position -- fractional T1[?] -- frame -- framing -- group -- group distribution frame[?] (GDF) -- heterogeneous multiplexing[?] -- homogeneous multiplexing[?] -- inverse multiplexer -- inverted position[?] -- labeled multiplexing[?] -- master frequency generator -- multicarrier modulation[?] (MCM) -- multichannel -- multiframe[?] -- multiplex aggregate bit rate[?] -- multiplex baseband -- multiplexer/demultiplexer[?] (muldem) -- multiplexer (MUX) -- multiplex hierarchy[?] -- multiplexing (MUXing) -- multiplex link encryption[?] -- orthogonal multiplex[?] -- precombining[?] -- pregroup combining[?] -- quadruple diversity[?] -- space-division multiplexing[?] -- statistical multiplexing[?] -- statistical time-division multiplexing[?] -- supergroup distribution frame[?] (SGDF) -- synchronous TDM[?] -- synchronous transfer mode[?] -- system loading[?] -- T-carrier -- thin-film optical multiplexer[?] -- time-division multiple access (TDMA) -- time-division multiplexing (TDM) -- transmultiplexer[?] -- trunk group multiplexer[?] (TGM) -- two-pilot regulation[?] -- wavelength-division multiplexing (WDM)
Networks and networking
Glossary of telecommunication network terms
NS/EP
assignment[?] -- communications survivability -- interoperability -- National Communications System (NCS) -- National Coordinating Center for Telecommunications[?] (NCC) -- NS/EP telecommunications -- priority level -- priority level assignment[?] -- private NS/EP telecommunications services[?] -- provisioning -- public switched NS/EP telecommunications services[?] -- service identification[?] -- Telecommunications Service Priority service[?] (TSP) -- Telecommunications Service Priority system[?] (TSP)
Organizations
administration -- AFNOR[?] -- American National Standards Institute (ANSI) -- Bell Operating Company[?] (BOC) -- Canadian Standards Association[?] (CSA) -- CCIR -- CCITT -- common carrier -- Deutsches Institut für Normung[?] (DIN) -- FCC -- International Telecommunication Union (ITU) -- ISO -- Joint Telecommunications Resources Board[?] (JTRB) -- National Command Authorities[?] (NCA) -- National Communications System (NCS) -- National Coordinating Center for Telecommunications[?] (NCC) -- public utilities commission[?] (PUC) -- Radio Regulations Board[?] (formerly IFRB) -- recognized operating agency (ROA) -- Regional Bell Operating Company[?] (RBOC) -- specialized common carrier[?] (SCC)
PCS/UPT/cellular mobile
base station[?] -- call associated signaling[?] (CAS) -- call management -- cell[?] -- cellular mobile -- fixed access -- interworking functions[?] -- mobile services switching center[?] (MSC) -- non-call associated signaling[?] (NCAS) -- non-fixed access -- PCS -- PCS switching center -- PCS System -- personal mobility -- personal registration[?] -- personal terminal[?] -- public land mobile network (PLMN) -- radio interface[?] -- service access[?] -- terminal mobility[?] -- terminal mobility management[?] -- Universal Personal Telecommunications service[?] (UPT) -- UPT access code[?] -- validation -- wireless access mode[?] -- wireless mobility management -- wireless terminal[?]
Power
bel (B) -- carrier power[?] (of a radio transmitter) -- carrier-to-receiver noise density (C /kT ) -- dB -- power -- radiance[?] -- radiant emittance[?] -- radiant intensity[?] -- radiant power[?] -- radiation efficiency[?] -- rated output power[?] -- reflectance -- relative transmission level -- rf power margin -- sensitivity -- signal level -- signal-to-crosstalk ratio -- SINAD -- singing margin[?] -- single-polarized antenna[?] -- single-sideband equipment reference level[?] (SSB) -- spectral density -- susceptibility threshold[?] -- system loading[?]
Power (Electrical)
apparent power -- auxiliary power -- demand factor -- demand load -- disconnect switch[?] -- effective power -- inverter -- level[?] -- load -- load factor[?] -- nonoperational load[?] -- operational load[?] -- power budget -- power factor -- power failure transfer -- primary distribution system[?] -- primary power[?] -- primary substation[?] -- protector[?] -- station load[?] -- technical load[?] -- uninterruptible power supply -- volt-amperes reactive (vars)
Protocols
acknowledgement -- Advanced Data Communication Control Procedures (ADCCP) -- binary synchronous communication[?] (bi-sync) -- carrier sense multiple access with collision avoidance (CSMA/CA) -- carrier sense multiple access with collision detection (CSMA/CD) -- Common Management Information Protocol[?] (CMIP) -- connection-oriented data transfer protocol[?] -- disconnect command[?] (DISC) -- facility -- frame relay -- FTP -- GOSIP[?] -- high-level data link control[?] (HDLC) -- HTTP -- ICMP -- internet protocol (IP) -- LAP-B[?] -- LAP-D[?] -- link protocol[?] -- mode -- network interface device (NID) -- Network File System (NFS) -- Open Systems Interconnection Specification (OSI)--Protocol -- ping -- protocol -- protocol-control information -- protocol converter[?] -- protocol data unit (PDU) -- protocol hierarchy[?] -- protocol translator[?] -- remote operations service element protocol (ROSE) -- response PDU[?] -- route -- segment -- serial -- Simple Mail Transfer Protocol (SMTP) -- Simple Network Management Protocol (SNMP) -- SLIP -- slot[?] -- slot time[?] -- synchronous data link control[?] (SDLC) -- TCP -- TCP/IP -- TCP/IP Suite -- Telnet -- transmission control protocol -- User Datagram Protocol (UDP) -- zero-bit insertion
Radio
adaptive radio[?] -- airborne radio relay -- air-ground radiotelephone service -- allcall[?] -- amateur service[?] -- anycall[?] -- atmospheric noise[?] -- automated radio[?] -- automatic link establishment (ALE) -- automatic message exchange (AME) -- automatic sounding -- brick -- broadcasting-satellite service[?] -- broadcasting satellite space station[?] -- broadcasting service[?] -- broadcasting station[?] -- broadcast operation[?] -- capture effect -- carrier synchronization[?] -- cellular mobile -- clear channel -- closed circuit -- combat-net radio (CNR) -- connectivity exchange (CONEX) -- controller[?] -- cross-band radiotelegraph procedure[?] -- coverage[?] -- dead space[?] -- deemphasis[?] -- detector -- deviation ratio[?] -- diffraction region[?] -- digital selective calling[?] (DSC) -- directed net[?] -- direction finding[?] -- discriminator[?] -- distance measuring equipment[?] (DME) -- diversity reception -- diversity transmission -- duplex operation[?] -- emergency locator transmitter (ELT) -- emergency position-indicating radiobeacon station[?] -- emphasis -- feeder link[?] -- FM blanketing -- FM improvement factor -- FM improvement threshold -- Fresnel zone -- harmful interference[?] -- heterodyne repeater -- homing[?] -- horn -- indefinite call sign[?] -- inside plant -- k-factor -- link -- linking protection[?] (LP) -- link quality analysis (LQA) -- maximum usable frequency (MUF) -- meaconing[?] -- mean power of a radio transmitter[?] -- medium -- message heading[?] -- message part[?] -- meteor burst communications[?] -- multi-satellite link[?] -- narrowband radio voice frequency[?] (NBRVF) -- near-vertical-incidence skywave[?] -- net control station[?] (NCS) -- net operation -- net radio interface[?] (NRI) -- off-the-air -- off-the-air monitoring[?] -- on-the-air -- path -- PBER -- PCS -- peak envelope power[?] (PEP, pX, PX of a radio transmitter) -- pilot -- precipitation static[?] (p-static) -- preemphasis -- preemphasis improvement -- preemphasis network -- preliminary call[?] -- primary service area -- propagation mode -- propagation path obstruction -- protection interval[?] (PI) -- push-to-talk operation -- quadruple diversity[?] -- query call[?] -- radiation -- radio -- radio and wire integration[?] (RWI) -- radio channel[?] -- radio common carrier[?] (RCC) -- radiocommunication[?] -- random access discrete address[?] (RADA) -- reflecting layer[?] -- rural radio service -- rural subscriber station[?] -- scan-stop lockup[?] -- ship Earth station[?] -- shortwave -- smooth Earth[?] -- sounding[?] -- sporadic E propagation -- spurious response[?] -- stereophonic sound subcarrier[?] -- stressed environment -- sudden ionospheric disturbance (SID) -- sunspot -- surface wave -- tail circuit[?] -- terrestrial radiocommunication[?] -- terrestrial station[?] -- transmitter power output rating[?] -- traveling wave[?] -- TRI-TAC equipment[?] -- vestigial sideband transmission[?] (VSB) -- white area[?] -- wildcard character
Routing
adaptive routing[?] -- alternate routing[?] -- avoidance routing[?] -- call tracing -- circuit routing[?] -- circuit switching unit[?] (CSU) -- collective routing -- destination routing[?] -- deterministic routing -- dynamically adaptive routing[?] -- flood search routing -- free routing[?] -- heuristic routing -- hierarchical routing -- hybrid routing -- mediation function -- multicast address -- network administration -- primary route[?] -- rerouting[?] -- route -- route diversity[?] -- route matrix[?] -- routing -- sender[?] -- spill-forward feature -- spur[?]
Satellites
acquisition -- active satellite[?] -- aeronautical mobile-satellite service[?] -- aeronautical mobile-satellite off-route service[?] (OR) -- aeronautical mobile-satellite route service[?] (R) -- amateur-satellite service[?] -- apogee -- broadcasting-satellite service[?] -- broadcasting satellite space station[?] -- carrier-to-receiver noise density (C /kT ) -- C-Band -- chip -- coast Earth station[?] -- communications satellite -- community reception[?] in the broadcasting-satellite service -- coordination area[?] -- cross-site link[?] -- direct orbit[?] -- downlink (D/L) -- dual access -- Earth coverage[?] -- Earth exploration-satellite service[?] -- Earth station[?] -- Earth terminal[?] -- Earth terminal complex -- equatorial orbit[?] -- equivalent satellite link noise temperature[?] -- fixed-satellite service[?] -- footprint[?] -- geostationary orbit -- geosynchronous orbit -- handoff -- inclination of an orbit[?] (of an Earth satellite) -- inclined orbit[?] -- individual reception in the broadcasting-satellite service[?] -- inter-satellite service[?] -- land mobile-satellite service[?] -- maritime mobile-satellite service[?] -- meteorological-satellite service[?] -- mobile Earth station[?] -- multiple access -- multi-satellite link[?] -- orbit -- orbit determination[?] -- passive satellite[?] -- periapsis -- perigee -- period of a satellite[?] -- polar orbit[?] -- preassignment access plan[?] -- pulse-address multiple access (PAMA) -- radiodetermination-satellite service[?] -- radionavigation-satellite service[?] -- resource controller[?] (RC) -- retrograde orbit -- satellite -- ship Earth station[?] -- space subsystem[?] -- spacecraft -- space operation service[?] -- space radiocommunication[?] -- space research service[?] -- space system[?] -- space telecommand[?] -- space tracking[?] -- spot beam -- standard frequency and time signal-satellite service[?] -- synchronous orbit -- synchronous satellite[?] -- tail circuit[?] -- uplink (U/L) -- view
Security
access -- anti-jam[?] -- anti-spoof[?] -- authenticate -- authentication -- authenticator -- automated information systems security -- between-the-lines entry[?] -- BLACK[?] -- BLACK signal[?] -- browsing[?] -- bug -- certification -- clipper chip[?] -- code -- communications deception -- communications-electronics (C-E) -- communications intelligence[?] (COMINT) -- communications protection -- communications security (COMSEC) -- compromise -- computer security (COMPUSEC) -- COMSEC equipment -- configuration management -- controlled area -- controlled security operation -- controlled space[?] -- data security[?] -- electronic emission security[?] -- emanations security[?] (EMSEC) -- emission security[?] -- end-to-end security[?] -- environmental security[?] -- information security -- information systems security (INFOSEC) -- label -- limited protection[?] -- monitoring -- NAK attack[?] -- operations security[?] -- password -- penetration -- privacy -- scrambler -- secure communications[?] -- secure transmission[?] -- security -- security filter[?] -- security kernel -- security management -- self-authentication[?] -- sensitive information -- server -- signals security[?] -- transmission security key[?] (TSK) -- trusted computing base (TCB) -- trusted computer system[?] (TCS) -- Warner exemption
Services and Service Features
Glossary of telecommunication service terms
Standards
ANSI/EIA/TIA-568[?] -- ASCII -- basic mode link control[?] -- basic rate interface[?] (BRI) -- de facto standard -- frequency standard -- functional profile -- GOSIP[?] -- group -- industry standard[?] -- interface standard -- International Telegraph Alphabet Number 5[?] (ITA-5) -- interoperability standard[?] -- message handling system[?] (MHS) -- National Electric Code® (NEC) -- network terminal number[?] (NTN) -- NTSC standard -- Open Systems Interconnection (OSI) -- Open Systems Interconnection (OSI)--architecture -- Open Systems Interconnection Specification (OSI)--Protocol -- Open Systems Interconnection--Reference Model (OSI--RM) -- Open Systems Interconnection Definitions[?] (OSI)--Service -- Open Systems Interconnection Management[?] (OSI)--Systems -- POSIX -- precise frequency[?] -- primary frequency standard[?] -- proprietary standard[?] -- p × 64[?] -- quarter common intermediate format[?] (QCIF) -- R interface[?] -- rubidium clock[?] -- rubidium standard -- secondary frequency standard -- secondary time standard[?] -- serial -- Signaling System No. 7 (SS7) -- SONET -- standard -- standard optical source[?] -- standard time and frequency signal service (STFS) -- system standard[?] -- terminal adapter -- time standard -- V-series Recommendations[?] -- X.-series Recommendations[?]
Storage
accumulator -- archiving[?] -- arithmetic overflow -- arithmetic register[?] -- arithmetic underflow[?] -- associative storage -- auxiliary storage -- buffer -- cache memory -- CD ROM -- channel -- clear[?] -- computer program origin[?] -- direct access -- direct address -- diskette -- disk pack[?] -- elastic buffer[?] -- erase -- field -- file -- file transfer, access, and management[?] (FTAM) -- hard sectoring -- head -- interblock gap[?] -- internal memory -- loader[?] -- machine-readable medium -- magnetic card[?] -- magnetic core storage[?] -- magnetic drum -- magnetic tape -- main storage -- medium -- memory -- off-line storage[?] -- optical disk -- overlay[?] -- overload -- packing density[?] -- permanent storage[?] -- phase-encoded recording[?] (PE) -- phase flux reversal[?] -- print-through[?] -- programmable read-only memory (PROM) -- queue -- queue traffic[?] -- queuing[?] -- random access memory (RAM) -- read head[?] -- reading[?] -- read-only memory (ROM) -- read-only storage[?] -- record -- record communication -- record information[?] -- record medium -- regeneration -- register -- rotational position sensing[?] -- sector -- sectoring[?] -- seek[?] -- seek time -- shift register -- simple buffering[?] -- skew -- soft sectoring[?] -- spooling[?] -- storage -- storage cell[?] -- store-and-forward[?] (S-F) -- store-and-forward switching center -- streaming tape drive[?] -- streaming tape recording[?] -- tag image file format[?] (TIFF) -- tape relay -- track -- track density[?] -- tracking error[?] -- variable length buffer -- virtual memory -- virtual storage -- volatile storage -- volume -- work space[?] -- write[?]
Synchronization
bilateral synchronization -- carrier synchronization[?] -- digital synchronization[?] -- double-ended synchronization -- frame synchronization -- linear analog synchronization[?] -- lip synchronization -- mutually synchronized network[?] -- mutual synchronization[?] -- nonsynchronous data transmission channel[?] -- pilot -- single-ended synchronization[?] -- synchronism -- synchronization -- synchronization bit[?] -- synchronization code[?] -- synchronization pulse[?] -- synchronous -- timing tracking accuracy[?] -- unilateral synchronization system[?]
Telegraphy
A-condition[?] -- Baudot code -- cable -- chad tape[?] -- characteristic distortion[?] -- character-stepped[?] -- double-frequency shift keying[?] (DFSK) -- end distortion -- equal-length code[?] -- frequency-shift telegraphy[?] -- internal bias[?] -- local battery -- mark[?] -- narrative traffic -- neutral direct-current telegraph system -- neutral operation[?] -- polar direct-current telegraph transmission[?] -- polarential telegraph system -- polar operation[?] -- push-to-type operation -- radiotelegram[?] -- radio telegraphy[?] -- record communication -- reperforator[?] -- sending-end crossfire[?] -- space -- tape relay -- telegram -- telegraphy -- teleprinter -- teletypewriter (TTY) -- terminal equipment -- tone diversity[?] -- TTY/TDD[?] -- twinplex[?] -- two-tone keying[?] -- voice-frequency telegraph[?] (VFTG) -- word
Telephony
Glossary of telephony terms
Television
advanced television[?] (ATV) -- aspect ratio -- cable TV (CATV) -- cable television relay service station (CARS) -- chroma keying -- chrominance signal[?] -- closed captioning -- closed circuit -- composite video -- distribution-quality television[?] -- extended-definition television (EDTV) -- fixed microwave auxiliary station[?] -- freeze frame television -- full-motion operation[?] -- ghost -- head end -- high-definition television (HDTV) -- improved-definition television (IDTV) -- lip synchronization -- minimum picture interval[?] -- PAL -- PAL-M[?] -- picture black[?] -- picture white[?] -- raster -- reference black level[?] -- reference white level[?] -- RGB -- scanning -- SECAM -- studio-to-transmitter link[?] (STL) -- television (TV) -- video
Time/Timing
absolute delay[?] -- cesium clock[?] -- channel time slot[?] -- clock -- coasting mode -- coherence time -- coordinated clock[?] -- coordinated time scale[?] -- Coordinated Universal Time (UTC) -- data transfer time[?] -- date -- date-time group (DTG) -- dating format[?] -- DoD master clock[?] -- epoch date -- equipment clock[?] -- external timing reference[?] -- false clock -- Greenwich Mean Time (GMT) -- heterochronous[?] -- hierarchically synchronized network[?] -- homochronous[?] -- independent clocks -- indirect control[?] -- International Atomic Time (TAI) -- isochronous -- isochronous demodulation[?] -- isochronous modulation[?] -- isochronous signal -- Julian date -- leap second -- local clock[?] -- master clock[?] -- master-slave timing[?] -- mesochronous[?] -- mutually synchronized network[?] -- mutual synchronization[?] -- near real time -- nodal clock[?] -- nonsynchronous network[?] -- oligarchically synchronized network[?] -- plesiochronous -- precise time[?] -- precise time and time interval[?] (PTTI) -- primary time standard -- principal clock -- protection interval[?] (PI) -- pull-in frequency range[?] -- quartz clock -- real time -- reference clock -- release time -- remote clock[?] -- rise time[?] -- rubidium clock[?] -- rubidium standard -- secondary time standard[?] -- serial -- slave clock -- standard frequency and time signal-satellite service[?] -- standard frequency and time signal service[?] -- standard frequency and time signal station[?] -- standard time and frequency signal service (STFS) -- station clock[?] -- synchronism -- synchronization -- synchronous network -- synchronous TDM[?] -- time -- time ambiguity[?] -- time instability[?] -- time interval error[?] (TIE) -- time jitter[?] -- time marker[?] -- time of occurrence[?] -- time-out -- time scale -- time standard -- timing recovery[?] -- timing signal[?] -- timing tracking accuracy[?] -- transmit-after-receive time delay -- transmitter attack-time delay -- transmitter release-time delay[?] -- uniform time scale[?] -- unit interval -- Universal Time (UT) -- UTC(i )
Traffic
activity factor[?] -- adaptive channel allocation[?] -- busy hour -- busy season[?] -- calling rate[?] -- call-second -- connections per circuit hour (CCH) -- directionalization[?] -- FOT -- frequency prediction[?] -- grade of service (GOS) -- group busy hour[?] (GBH) -- high-usage trunk group[?] -- holding time[?] -- interconnect facility -- line traffic coordinator[?] (LTC) -- loading -- minimize[?] -- narrative traffic -- net control station[?] (NCS) -- off-line recovery[?] -- overflow -- queue -- queue traffic[?] -- queuing[?] -- record traffic[?] -- scanning -- short haul toll traffic[?] -- switch busy hour[?] -- traffic
Transmission and Transmission lines
Glossary of telecommunications transmission terms
Video
average picture level[?] (APL) -- block distortion[?] -- blurring[?] -- color errors[?] -- continuous presence[?] -- contrast -- control field[?] -- edge busyness[?] -- error blocks[?] -- field -- frame -- freeze frame[?] -- image -- interlaced scanning -- jerkiness -- mosquito noise[?] -- motion compensation -- motion response degradation[?] -- motion video[?] -- object -- object persistence[?] -- object retention[?] -- panning -- p × 64[?] -- quarter common intermediate format[?] (QCIF) -- scene cut[?] -- scene cut response[?] -- smearing[?] -- snow -- spatial application -- spatial edge noise[?] -- still image[?] -- still video[?] -- temporal application[?] -- temporal edge noise[?] -- transmission service channel[?] -- video -- videophone[?] -- windowing[?]
Waves
carrier (cxr) -- coherence area[?] -- coherence length -- coherent -- continuous wave[?] (cw) -- depolarization[?] -- doppler effect -- electromagnetic wave (EMW) -- elliptical polarization -- envelope -- group delay -- group delay time[?] -- guided wave[?] -- indirect wave[?] -- left-hand polarized wave[?] (anti-clockwise) -- linear polarization -- material scattering -- microwave -- millimeter wave[?] -- plane wave -- polarization -- polarization diversity[?] -- Poynting vector -- propagation -- pulse carrier[?] -- radiant energy[?] -- radiation -- radio -- radio beam[?] -- radiocommunication[?] -- radio wave -- reflection loss -- reflection -- reflection coefficient (RC) -- right-hand polarized wave[?] (clockwise) -- scattering -- signature -- spurious response[?] -- square wave[?] -- standing wave -- standing wave ratio (SWR) -- tropospheric wave -- waveform -- wavefront[?] -- waveguide scattering[?] -- wave impedance -- wavelength -- wavelength stability[?] -- wave trap[?]
Other
attack time -- vox
Orphans
Access charge -- Aeronautical Emergency Communications System Plan -- Adaptive communications -- Adder-subtracter -- Address message -- AIOD leads -- Air-ground worldwide communications system -- Alarm sensor -- Alternate party -- Area broadcast shift -- Arithmetic shift -- Articulation score -- Asynchronous communications system -- Audible ringing tone -- Audio response unit -- Automatic call distributor -- Automatic callback -- Automatic switching system -- Back-to-back connection -- Balance return loss -- Bandwidth compression -- Bit-count integrity -- Bit-sequence independence -- Bit inversion -- Bit slip -- Bit synchronous operation -- Black noise -- Blind transmission -- Block check character -- Bridge-to-bridge station -- Call-sign allocation plan -- Call collision -- Call delay -- Call duration -- Call processing -- Call set-up time -- Camp-on busy signal -- Carson bandwidth rule -- Centrex service -- Cesium standard -- Channel reliability -- Character-count integrity -- Circuit reliability -- Circuit restoration -- Circular polarization -- Circulator -- Clear message -- Closed-loop transfer function -- Closed waveguide -- Coded set -- Command and control warfare -- Commonality -- Communications blackout -- Communications jamming -- Communications subsystem -- Communications system engineering -- Companding -- Compatible sideband transmission -- Computer conferencing -- Computer network operating system -- Conduction band -- Conference operation -- Configuration control -- Conservation of radiance -- Control of electromagnetic radiation -- Convoy internal communications -- Cryptochannel -- Curve-fitting compaction -- DOD master clock -- Data access arrangement -- Data bank -- Data element -- Data forwarder -- Data service unit -- Decollimation -- Dejitterizer -- Demand assignment -- Desensitation -- Design objective -- Dielectric strength -- Digital milliwatt -- Disengagement originator -- Distributed-queue dual-bus network -- Disturbance voltage -- Dropout -- Dual in-line package -- Duplexer -- Effective data transfer rate -- Effective transmission rate -- Efficiency factor -- Electro-optic effect -- Electro-optics -- Electromagnetic interference control -- Electromagnetic radiation hazards -- Electromagnetic survivability -- Electronic deception -- Electronic warfare support measures -- Endurability -- Exempted addressee -- Extended superframe -- Extinction ratio -- FCC registration program -- Facsimile converter -- Fading distribution -- Fall time -- Flywheel effect -- Foreign instrumentation signals intelligence -- Forward echo -- Four-wire circuit -- Four-wire terminating set -- Frame slip -- Framing bit -- Frequency-exchange signaling -- Frequency averaging -- Frequency compatibility -- Frequency frogging -- Frequency sharing -- Frequency shift -- Gaussian beam -- Ground constants -- Ground loop -- High-performance equipment -- Hop count -- Hybrid balance -- Identification, friend or foe -- Injection laser diode -- Interchangeability -- Inverse-square law -- Ionospheric sounding -- Justify -- Kerr electro-optic effect -- Key pulsing -- Lambert's cosine law -- Loading characteristic -- Loading coil -- Local call -- Lockout (telecommunication) -- Long-haul communications -- Long-term stability -- Longitudinal voltage -- Low-performance equipment -- Low-power communication device -- Magneto-optic effect -- Maintainability -- Maximal-ratio combiner -- Maximum user signaling rate -- Mean time between outages -- Medium-power talker -- Message format -- Modulation factor -- Multiport repeater -- Nuclear hardness -- Nyquist rate -- Operating time -- Operational service period -- Optical attenuator -- Optical density -- Optical switch -- Out-of-band signaling -- Output rating -- Packet-switching node -- Par meter -- Password length equation -- Password length parameter -- Path quality analysis -- Phantom circuit -- Phase inversion -- Photocurrent -- Planck's law -- Proceed-to-select -- Psophometric voltage -- Pulsating direct current -- Pulse link repeater -- Quasi-analog signal -- Radio equipment -- Radio fix -- Radiometry -- Randomizer -- Receive-after-transmit time delay -- Receiver attack-time delay -- Recorder warning tone -- Reference circuit -- Reflectivity -- Reframing time -- Repeating coil -- Ringaround -- Ringback signal -- Ringdown -- Ringer equivalency number -- Round-trip delay time -- Schematic -- Second dialtone -- Separate channel signaling -- Serial access -- Simplex circuit -- Simplex signaling -- Slant range -- Slave station -- Specific detectivity -- Speckle pattern -- Speed of service -- Standard telegraph level -- Standard test signal -- Steady-state condition -- Tactical communications system -- Teletraining -- Ternary signal -- Thermodynamic temperature -- Third-order intercept point -- Time-assignment speech interpolation -- Tactical data information link--A -- Time-domain reflectometer -- Time code ambiguity -- Toll switching trunk -- Traffic-flow security -- Transmission coefficient -- Transmit flow control -- Transportability -- Turnkey -- UPT environment -- UPT service profile -- User information bit -- Video teleconferencing unit -- Virtual call capability
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