Wikipedia:Missing science topics/Federal Standard 1037C

Federal Standard 1037C entitled Telecommunications: Glossary of Telecommunication Terms is a U.S. Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended.

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 U.S. Government, prepared by an agency of the U.S. Government, it appears to be mostly available as a public domain resource, but a few items are derived from copyrighted sources: where this is the case, there is an attribution to the source.

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 computing -- 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
List of antenna terms

Codes/Coding
List of coding terms

Computer Graphics
List of computer graphics terms

Computer Hardware
List of computer hardware terms

Computer Programming/Languages/Software
List 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 limit -- 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
List of telecommunications encryption terms

Facsimile
List of fax terms

Fiber Optics
List of fiber optic terms

Filters
List of telecommunications 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) -- 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 -- 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/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
List 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) -- BSI -- Canadian Standards Association (CSA) -- CCIR -- CEN -- CENELEC -- common carrier -- Deutsches Institut f& (DIN) -- ETSI -- FCC -- International Telecommunication Union (ITU) -- ITU-T -- ISO -- Joint Telecommunications Resources Board (JTRB) -- National Command Authorities (NCA) -- National Communications System (NCS) -- National Exchange Carrier Association -- 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) -- Verband Deutscher Electrotechniker (VDE)

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 (communications) -- 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
List 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 Electrical Code&reg; (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 & -- 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 -- common battery -- 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
List 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 -- Frequency of Optimum Transmission (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
List 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 & -- 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 wave (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 and health -- 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 -- Turnkey -- UPT environment -- UPT service profile -- User information bit -- Video teleconferencing unit -- Virtual call capability