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| geostationary orbit geostationary satellite geostationary satellite orbit geosynchronous orbit germanium photodiode ghost gigaflop gigahertz (GHz) glare glass glide slope facility global global address global status GMT go-ahead message go-ahead notice go-ahead tone gold code Gopher GOS GOSIP Government Open Systems Interconnection Profile graceful degradation graded-index fiber graded-index profile grade of service (GOS) grandfathered systems grandfathered terminal equipment graphical user interface (GUI) graphic character graphics Gray code gray scale great circle Greenwich Civil Time (GCT) Greenwich Mean Time (GMT) ground ground absorption ground constants ground current ground loop ground plane ground potential ground-return circuit ground start ground wave group group address group alerting and dispatching system group busy hour (GBH) group delay group delay time group distribution frame (GDF) group index ( N ) grouping factor group 1. . . 4 facsimile group patch bay group velocity G / T guard band guarded frequency guided mode guided ray guided wave Hagelbarger code half-duplex (HDX) operation halftone halftone characteristic Hamming code Hamming distance Hamming weight handoff handshaking hangover HA1-receiver weighting hard copy hard disk hardened hard limiting hard sectoring hardware hardwire harmful interference harmonic harmonic distortion hazards of electromagnetic radiation to fuel (HERF) hazards of electromagnetic radiation to ordnance (HERO) hazards of electromagnetic radiation to personnel (HERP) H-bend H-channel HDLC HDTV HDX head head end header head-of-bus function head-on collision Heaviside layer height gain helical antenna HEMP HE 11 mode HERF HERO HERP hertz (Hz) Hertzian wave heterochronous heterodyne heterodyne repeater heterogeneous multiplexing heuristic routing hexadecimal
intrinsic noise
International Telegraph and Telephone Consultative Committee |
HF HFDF hierarchical computer network hierarchically synchronized network hierarchical routing high-altitude electromagnetic pulse (HEMP) high-definition television (HDTV) higher frequency ground high frequency (HF) high-frequency distribution frame (HFDF) high-level control high-level data link control (HDLC) high-level language (HLL) high-order language high-pass filter high-performance equipment high-usage trunk group highway hiss hit HLL hockey puck hold-in frequency range holding time homing homochronous homogeneous cladding homogeneous multiplexing hop hop count horizon angle horizontal redundancy check horizontal resolution horn horn gap switch host host computer hot boot hotline hot standby house cable housekeeping signals H-plane bend HTML HTTP hub Huffman coding hundred call-seconds (CCS) hunting hybrid hybrid balance hybrid cable hybrid coil hybrid communications network hybrid computer hybrid connector hybrid coupler hybrid interface structure hybrid junction hybrid mode hybrid network hybrid routing hybrid set hybrid spread spectrum hybrid system hybrid topology hydroxyl ion absorption hypermedia hypertext Hypertext Transfer Protocol Hz ICA ICI ICMP icon ICW identification, friend or foe (IFF) identification friend or foe personal identifier identifier (ID) IDF idle-channel noise idle character idle-line termination idle state idle time IDN IDTV IF I/F IFF IFRB IF repeater IFS ILD illegal character ILS IM image image antenna image frequency image frequency rejection ratio image rejection ratio imagery IMD immediate message IMP impedance impedance matching improper character improved-definition television (IDTV) improvement threshold impulse impulse excitation impulse noise impulse response IN in-band noise power ratio in-band signaling incidental-radiation device inclination of an orbit (of an Earth satellite) inclined orbit inclusion incoherent incoming call identification (ICI) incorrect block incremental compaction incremental phase modulation (IPM) indefinite call sign
interoperability standard |
independent clocks |