Articulation score – Astable – Asymmetric Digital Subscriber Line – Asynchronous communications system – Asynchronous operation – Asynchronous start-stop – Atmospheric duct – Atmospheric waveguide – Attenuation – Audible ringing tone – Audio system measurements – Audiophile – Automatic call distributor – Automatic gain control – Automatic link establishment – Automatic number identification – Automatic sounding – Automatic switching system – Autovon – Availability – Avalanche diode – Azimuth Backplane – Backscattering – Back-to-back connection – Backward channel – Balance return loss – Balanced line – Balancing network – Ball grid array – Band gap – Band-stop filter – Bandwidth compression – Bare particular – Barrage jamming – Baseband – Battery (electricity) – Baud – Baudot code – BCS theory – Beam diameter – Beam divergence – Beam steering – Beamwidth – Beat frequency oscillator – Bel – Biconical antenna – Big ugly dish – Bilateral synchronization – Billboard antenna – Binary classification – Binary multiplier – Binaural recording – Bipolar junction transistor – Bipolar signal – Bit inversion – Bit pairing – Bit robbing – Bit stuffing – Bit synchronous operation – Bit-count integrity – Bits per second – Black facsimile transmission – Black recording – Blanketing – Bluetooth – Blu-ray Disc – BNC connector – Boresight – Breadboard – Bremsstrahlung – Bridging loss – Broadband Internet – Broadband wireless access – Broadband – Broadcasting – Burst transmission – Busy hour – Busy signal – Bypass Cable modem – Cable television – Caesium standard – Call collision – Call set-up time – Call-second – Capacitive coupling – Capacitor – Capture effect – Carbon nanotube – Card standards – Carrier-sense multiple access with collision detection – Carrier shift – Carrier system – Carrier wave – Carrier-to-receiver noise density – Carson bandwidth rule – Cassegrain antenna – Category 5 cable – Cathode-ray tube – Central processing unit – Chadless tape – Channel – Channel noise level – Channel reliability – Character-count integrity – Characteristic impedance – Charge-coupled device – Chemical vapor deposition – Chirp – Chroma subsampling – Circuit breaker – Circuit noise level – Circuit reliability – Circuit restoration – Circuit switching – Circular polarization – Circulator – Citizens' band radio – Cladding – Clapp oscillator – Clean room – Clear channel – Clearing – Clipping – Clock gating – Clock signal – Closed waveguide – Closed-circuit television –
Image antenna – Image impedance – Image frequency – Image rejection ratio – Image response – Impedance matching – In-band on-channel – Incidental radiator – Independent sideband – Index of cooperation – Inductive coupling – Inductive reactance – Inductor – Industrial Computers – Information transfer – Information-bearer channel – Infrared – Input/output – Insertion gain – Insertion loss – Inside plant – Integrated circuit – Intensity modulation – Intentional radiator – Intercept – Interchange circuit – Intercharacter interval – Interconnect facility – Interference – Interferometry – Intermediate-field region – Intermodulation distortion – International Electrotechnical Commission – Interoperability – Interposition trunk – Intersymbol interference – Inverse multiplexer – Inverse-square law – Ion pump – Ionosphere – ISM band – Isochronous burst transmission – Isochronous signal – Isotropic antenna Jam signal – Jamming – Jansky – Jitter Karnaugh map – Kendall effect – Key pulsing – Kirchhoff's circuit laws – Klystron – Knife-edge effect Laser – Launch angle – Launch numerical aperture – Lead-lag effect – Leaky mode – Light bulb – Light-dependent resistor – Light-emitting diode – Lightning – Limiting – Line code – Linear-feedback shift register – Linear regulator – Lip synchronization – List of telephony terminology – Lists of video game companies –
Minimum bend radius – Mode scrambler – Mode volume – Modem – Modular synthesizer – Modulation factor – Modulation rate – Modulation – Molecular electronics – Monostable – Moore's law – Morse code – MOS Technology 6501 – MOS Technology 6502 – MOS Technology SID – MOS Technology VIC-II – Mu-law algorithm – Multicoupler – Multi-element dipole antenna – Multimeter – Multipath propagation – Multiple access – Multiple homing – Multiplex baseband – Multiplexer – Multiplexing – Multivibrator N connector – Nanotechnology – Nanowire – Narrative traffic – Narrowband modem – Narrowband – National Electrical Code (US) – Natural frequency – Near-field region – Negative resistance – Negative-acknowledge character – Net gain (telecommunications) – Netlist – Network administration – Network architecture – Network management – Neural network (machine learning) – Neutral direct-current telegraph system – NI Multisim – Nickel metal hydride – Noise figure – Noise (electronics) – Noise power – Noise temperature – Noise weighting – Noise-cancelling headphone – Noise-equivalent power – Non-return-to-zero – Normalized frequency – Norton's theorem –
Spill-forward feature – Spillover – Spin glass – Spot beam – Spread spectrum – Spurious emission – Squelch – Standard telegraph level – Standard test signal – Standard test tone – Standing wave ratio – Standing wave – Starpath Supercharger – Start signal – Start-stop transmission – Static electricity – Steady-state condition – Step-index profile – Stoletov's law – Stop signal – Stopband – Store-and-forward switching center – Stressed environment – Strobe light – Stroke speed – Subcarrier – Subtractive synthesis – Sudden ionospheric disturbance – Supercomputer – Superconductivity – Superheterodyne receiver – Superparamagnetism – Superposition theorem – Supervisory program – Suppressed carrier transmission – Surface wave – Surface-mount technology – Surveillance device – Survivability – S-Video – Switch – Switched-mode power supply – Synchronism – Synchronization – Synchronizing – Synchronous network – Synchronous optical networking – Synthesizer – System integrity – Systems control Table of standard electrode potentials – Tactical communications system – Tactical communications – Tactical data information link--A – Tantalum – Tape relay – T-carrier – Technical control facility – Telecommunications – Communications – Telecommunications service – Teleconference – Telegrapher's equations – Telegraphy – Telemetry – Telephone tapping – Teletext – Teletraining – Television – Television reception –
Tensor – Tesla coil – Tesla patents – Test antenna – Tether propulsion – Thermal noise – Thermal tails – Thermistor – Thévenin's theorem – Third-order intercept point – TNC connector – Three phase – Time-assignment speech interpolation – Time-division multiple access – Time-division multiplexing – Time-domain reflectometer – Time-out – Tinfoil hat – Toll switching trunk – Total harmonic distortion – Total internal reflection – Traffic intensity – Traffic shaping – Transceiver – Transcoding – Transducer – Transformer – Transient electromagnetic device – Transimpedance amplifier – Transistor radio – Transistor – Transistor-transistor logic –
Zero dBm transmission level point – Zero insertion force (ZIF) – Zero-dispersion wavelength – Zigbee – Zig-zag in-line package – Zobel network – Zone melting – Z-transform