Digital Trunk Group

- call pickup group
- cathode group
- channels group
- circuit group
- closed-user group
- common-line group
- contact group
- data-packet group
- data-time group
- dedicated-line group
- departmental communication radio group
- digital group
- digital television group
- digital transmission group
- diode group
- direct-channel group
- duplex radio group
- entended numbers group
- Euro-beam group
- exchange group
- external interference group
- full accessible group
- fundamental group
- generator data group
- group of blocks
- group of computers
- group of pictures
- half-group
- high-usage trunk group
- hunting group
- link group
- locked group
- low-orbit group
- master group
- messages group
- multimaster group
- nonlocked group
- Or Borealis group
- Or Concordia group
- orbit group
- outlet group
- partially-accessible group
- peer group
- primary channels group
- programmable-talk group
- pulse group
- radio group
- road communication radio group
- screening group
- secondary channels group
- terminal-endpoint functional group
- tertiary channels group
- through group
- transformer group
- trunk group
- trunking channel group
- twelve-channel group
- user group

- analog multiplexer
- basic multiplexer
- bit-compressor multiplexer
- bit-driver multiplexer
- circuit-switched multiplexer
- data-transmission multiplexer
- digital multiplexer
- exchange multiplexer
- frequency multiplexer
- input multiplexer
- intelligent time-division multiplexer
- internetworking multiplexer
- inverse multiplexer
- magnetic-core multiplexer
- second-order multiplexer
- service multiplexer
- smart multiplexer
- statistical multiplexer
- subscriber loop multiplexer
- switching multiplexer
- synchronous multiplexer
- terminal multiplexer
- thin-film optical multiplexer
- trunk-group multiplexer

- active network
- adjustment network
- all-pass network
- analog cellular network
- asynchronous network
- automatic secure voice communication network
- automatic voice network
- average-capacity radio-relay network
- backbone network
- banyan network
- baseband network
- baseband-switched network
- baseline network
- branched network
- bridged-T network
- broadband integrated-service digital network
- building-out network
- bus network
- butterfly network
- cable telephone network
- cable-news network
- cable-television network
- carrier recovery network
- CATV network
- cellular paging network
- cellular radio network
- circuit-switched network
- circuit-switching network
- circular radiocommunication network
- closed cellular network
- combined distribution network
- commercial communication network
- common-telegraph network
- common-telephone network
- common-user network
- communication network
- compromise network
- computer network
- computerized transport communication network
- conferencing network
- coordinate network
- copy network
- core network
- corporate network
- corporative network
- corrective network
- coupling network
- cross-connect network
- customer network
- damaged network
- data-communication network
- data-computing network
- data-transmission network
- decoding network
- decoupling network
- deemphasis network
- Deep-Space network
- degraded network
- delay-line network
- democratic network
- democratically-synchronized network
- departmental communication network
- departmental data-transmission network
- departmental engineering communication network
- departmental facsimile network
- departmental radio network
- departmental telegraph network
- departmental telephone network
- derived-services network
- despotic network
- despotically-synchronized network
- dial network
- dial-up network
- differentiating network
- digital cellular network
- discrete communication network
- dispersed network
- district center telephone network
- district telephone network
- dual network
- electric communication networks
- electric switched network
- electrically switched network
- engineering subscribers network
- enhanced other networks
- equivalent network
- expansion network
- facsimile-communication network
- federal paging network
- fiber-hubbed network
- fiber-optical network
- flip network
- four-pole network
- four-wire distribution network
- full-service network
- gas-pipeline servicing relay network
- go-around radio network
- group channels network
- group network
- half-open cellular network
- hierarchic computer network
- hierarchical computer network
- hierarchically-synchronized network
- high-capacity radio relay network
- highly hierarchical network
- highly pipelined network
- H-network
- homogeneous network
- hybrid communication network
- hybrid fiber-and-coaxial network
- inductance network
- inductance-capacitance network
- inductance-resisitance network
- inductive cable network
- information network
- in-house network
- integrated digital communication network
- integrated digital network
- integrated transport network
- integrated-services backbone network
- integrated-services digital network
- intelligent network
- interactive network
- interbuilding network
- intercity network
- intercom network
- international communication network
- interoffice transit network
- interorganization network
- intraairport communication network
- intraareal network
- intrabuilding communication network
- intraindustrial communication network
- intraindustrial telephone network
- intraobject communication network
- intraoffice network
- joint-academic network
- landing radio network
- lead network
- leased-line network
- line communication network
- line radio communication network
- linear network
- line-building-out network
- local communication network
- local paging network
- local telephone network
- local transport network
- long distance communication network
- loop network
- loudspeaker dividing network
- main network
- managed-data network
- mesh network
- message switching network
- meteorological radio network
- metropolitan-area network
- microwave network
- mid-split network
- mine telephone network
- Ministry of Communication network
- mixed network
- modem-based network
- monochannel network
- multiaccess network
- multifrequency network
- multilayer network
- multipath network
- multiple-domain network
- multiple-switching network
- multiring network
- multistation network
- multisystem network
- mutually-synchronized network
- narrowband digital integrated-service network
- nation-wide network
- n-layer network
- NMT network
- nodeless network
- nonhomogeneous network
- nonintegrated network
- nonswitched network
- nonsynchronous network
- oil-pipeline servicing relay network
- oligarchically-synchronized network
- open cellular network
- optoelectronic network
- originating-switching network
- packet wireless communication network
- packet-radio network
- packet-switching network
- parallel-T network
- passenger train-chief radio network
- passenger train-master radio network
- passive network
- personal radio network
- phase-correcting network
- planetext network
- polled network
- port-annunciation network
- preemphasis network
- press-teletype network
- primary-trunk communication network
- private intercompany network
- private voice-band network
- private-business network
- proliferated network
- protected network
- provincial center telephone network
- public-data network
- public-switched telephone network
- public-telegraph network
- public-transport network
- pulse-delay network
- pulse-forming network
- queueing network
- radial paging network
- radio network
- radiotransmitters network
- railway center radio network
- railway communication network
- railway telephone network
- random-access network
- Raynet network
- RC network
- reconfigured network
- regional communication network
- regional paging network
- reserved radio network
- resistance-capacitance network
- ring network
- ring-radial network
- ring-star network
- road communication network
- routing network
- rural telephone network
- salvation radio network
- satellite network
- secondary computerized communication network
- selective network
- separate crossover network
- shaping network
- ship telephone network
- short-haul network
- shuffle-exchange network
- silent network
- simplex zonal radio network
- simulcast network
- single-frequency network
- slotted-envelope network
- slotted-ring network
- small-capacity radio relay network
- software-defined network
- space network
- space-time-space network
- special communication network
- spread of work radio communication network
- stage-controlled network
- star network
- star-shape network
- station communication network
- submarine cable network
- subscriber's telegraph network
- switched-message network
- switching network
- synchronous-data network
- take-off radio network
- talk-TV network
- taxi radio network
- telecode communication network
- telecommunication network
- telecommunication-management network
- telegraph communication network
- telephone network
- teleprocessing network
- teletex network
- teletype network
- teletypewriter network
- television network
- telex-communication network
- temporary line dispatch radio network
- terminating switching network
- token passing network
- token-bus network
- token-ring network
- token-sharing network
- toll-telephone network
- transit network
- transmission network
- trunk telephone network
- trunking channels network
- underground antenna network
- united automatized state communication network
- urban telephone network
- video area network
- virtual network
- voice network
- water-communication network
- waterside communication network
- wire-hanger network
- wireless network
- word processor network

- analog subscriber set
- answer relay set
- antisidetone set
- ASCII-character set
- automatic zero set
- auxiliary communication type set
- beacon set
- bridging set
- callback-telephone set
- channel set
- character set
- coded-character set
- command set
- common-battery set
- conference set
- conference-communication set
- converter set
- cord set
- cradle set
- crystal set
- customer set
- data set
- device-control code set
- dial-telephone set
- dictaphone set
- digital subscriber set
- direct-data set
- discharging set
- domestic-television set
- duplex-trunk communication set
- executive set
- expansion set
- extension set
- fiber-optic terminal set
- four-wire set
- freehand set
- frequency changer set
- G1 code set
- G2 code set
- generating set
- ground-to-airplane UHF-communication set
- handset set
- hybrid set
- incoming set
- industry TV-set
- infrared-communications set
- interface set
- key set
- key-telephone set
- language set
- LH-termination set
- local battery telephone set
- local communication set
- long distance dial set
- loud-speaking communication set
- magnet telephone set
- magneto telephone set
- manual telephone set
- matching relay set
- mosaic graphic set
- noise/interference set
- noise-immune set
- nontemporary data set
- null set
- n-wire set
- open-standard digital television set
- operator's set
- outgoing set
- paging telephone set
- paired subscriber's set
- paired telephone set
- PBX components set
- personal hearing set
- polar set
- polar-battery set
- primary group converting set
- primary trunking set
- projection set
- push-button set
- quaternary trunking set
- radiac set
- radio set
- radiosonde set
- receiving set
- relay set
- resistance set
- satellite communication set
- searching signaling set
- selective communication set
- SHF-antenna set
- simplex trunk communication set
- speaking devices set
- standard code set
- standard cord set
- station-master assistant set
- subaudio telegraph set
- subscriber set
- subscriber's cord set
- telegraph set
- telephone set
- television set
- temporary data set
- terminating set
- terrestrial satellite radio set
- tester set
- time-signal set
- tone dialing set
- transmission measuring set
- transmission test set
- transmitting set
- transponder set
- trunk communication set
- UHF-device set
- universal cord set
- universal relay set
- USB-set
- user's set

- acoustic alarm system
- acoustic image system
- acoustic systems
- actiontrack system
- active IR-system
- actuator system
- adaptive communication system
- adaptive teleinformation system
- adaptive telemetering system
- advanced information system
- Afsatcom system
- air system
- aircraft intercommunication system
- airfield communication system
- air-ground automatic system
- airline reservation system
- air-to-ground TV system
- alarm signal system
- alarm system
- all-channel signaling system
- ALL-IN-ONE system
- alphanumeric system
- amplified speaker system
- amplitude shift-keying system
- AMPS system
- analog cellular communication system
- analog cellular system
- analog component video system
- analog television system
- analog tropospheric system
- anisochronous system
- antenna system
- antitheft system
- AR system
- Arabsat system
- ASK system
- associated channel analog system
- asynchronous address communication system
- audio recording system
- Aurora system
- Aussat system
- automatic communication system
- automatic connection establishment system
- automatic control system
- automatic data acquisition system
- automatic telegraphy system
- automatic telephone system
- automatic tuning system
- automatized cellular system
- auxiliary alarm system
- balanced cable transmission system
- band sharing system
- base station system
- baseband system
- basic input/output system
- bass-reflex speaker system
- batch processing system
- batch transmission system
- batch-and-forward system
- batteryless system
- bilateral CTV system
- binary tariff system
- biocontrol system
- bit parallel interface system
- bit transport system
- bridge duplex system
- broadband mobile system
- broadcast satellite system
- broadcasting delivery media systems
- burglar alarm system
- byte-serial interface system
- cabinet system
- cabinetless system
- cable distribution system
- cable TV system
- call-accounting system
- call-answering system
- call-counting system
- call-distributing system
- call-processing system
- call-queueing system
- camp-on system
- CAPTAIN system
- car component audio system
- carrier reinsertion system
- carrier system
- carrier-communication system
- carrier-current communication system
- Cassegrain-Schmidt system
- cassette recording system
- cassette reproducing system
- CATRIN system
- caution system
- CD 900 system
- cellular system
- cellular-radio system
- central-battery system
- centralized control system
- chirp binary telegraph system
- cipher system
- circuit switched telecommunication system
- circuit switching telecommunication system
- circular telecontrol system
- clock system
- closed-circuit communication system
- closed-circuit telegraph system
- closed-numbering system
- code-dependent system
- code-division multiple access system
- code-independent system
- code-insensitive system
- code-sensitive system
- coding system
- coherent fiber-optic system
- collimating system
- collocated system
- color separating system
- combined numbering system
- combined power supply system
- combined satellite communication system
- common-battery system
- common-carrier system
- common-channel signaling system
- common-engineering communication system
- common-purpose cellular system
- common-using band system
- common-using cordless telephone system
- common-using paging system
- communication system
- communication traffic system
- communications system
- community antenna system
- community antenna television system
- community TV-system
- commununication switching system
- compact disk digital audio system
- compatible color television system
- compatible single sideband system
- compatible single-band system
- compatible TV-system
- complex radio communication system
- computer vision system
- computer-telephone system
- Comsar system
- Comsat system
- Conax system
- concentrated-insonation system
- conference system
- conference-communication system
- congested system
- congress-class system
- constant-current system
- control generating system
- conventional television system
- Conversant system
- cordless-communication system
- crossbar system
- crossed-coincident microphone system
- Crosspoint system
- CSE system
- C-system
- cubical video projecting system
- data processing system
- data system
- data transport system
- data-collection system
- data-compression system
- data-exchange system
- dataflow system
- data-gathering system
- data-handling system
- data-measuring system
- data-reduction system
- data-transmission system
- Decca Navigator system
- DECfax system
- decision-feedback system
- dedicated control channel system
- dedicated multimedia system
- delta-sigma system
- deluxe presentation system
- departmental communication system
- desktop-video system
- DFS/Copernicus system
- dial-telephone system
- differential phase shift-keying system
- differential-duplex system
- differential-magnetic system
- digital camera system
- digital hybrid-key telephone system
- digital mass storage system
- digital microwave radio transmission system
- digital telephone communication system
- digital transmission system
- digital TV-communication system
- Digital UNIX system
- digital-analog system
- digital-cellular system
- digital-data modulation system
- digital-effect system
- digital-message entry system
- digital-termination system
- direct-broadcasting satellite system
- directing system
- direct-modulation system
- direct-sequence system
- direct-telephone communication system
- discrete communication system
- discrete sound system
- discrete-addressing system
- disk-operating system
- DISOSS system
- dispatch telephone communication system
- dispatch-center system
- dispersed-insonation system
- distributed-insonation system
- distributed-processing system
- documental-type communication system
- Dolby systems
- domestic satellite communication system
- double-band telephone communication system
- double-channel transmission system
- double-current transmission system
- double-pole communication system
- double-sideband large carrier system
- DSCS system
- D-system
- dual-cable system
- dual-reflector system
- duplexed system
- Earth-to-space transmission system
- ECM system
- electric communication system
- electronic antishock system
- electronic data-gathering system
- electronic data-processing system
- electronic-message system
- electronic-scanning system
- electronic-switching system
- Ellipso system
- emergency telephone communication system
- emergency-broadcast system
- EMX system
- equidistant system
- error-correction system
- error-detection system
- Eutelsat system
- extensible system
- external paging system
- facsimile system
- fast-acting servicing system
- fault-tolerant system
- fax communication system
- fax transmitting system
- feed system
- fiber transmission system
- fiber-optic transmission system
- field-sequential system
- final mile system
- finishing system
- fire alarm system
- fire warning system
- first generation cellular system
- five-channel communication system
- fixed satellite system
- Flexcam system
- flexible access system
- Flitsatcom system
- focusing system
- four-channel sound system
- four-dimensional system
- four-wire telephone communication system
- frame-sequential system
- frequency shift-keying system
- frequency-carrier system
- frequency-control system
- front-bass reflex speaker system
- fully digital system
- gate system
- Gaussian system
- generalized system
- generating dynamic system
- generator-dc-motor system
- GIGASET radio system
- global positioning system
- Global system
- Gopher system
- grandfathered system
- group-alerting and dispatching system
- guide system
- hard-wired CCTV system
- hazard system
- helical-scan system
- HF-synchronizing system
- high-precision navigating system
- Hi-linear system
- home system
- home-telephone system
- home-type system
- homing-guidance system
- host system
- hydroacoustic system
- ideal communication system
- idealized system
- image informaion system
- image-forming system
- immedial servicing system
- incompatible system
- independent system
- information retrieval system
- information system radio system
- information system
- information-feedback system
- information-measuring system
- infrared alarm system
- Inmarsat system
- Inmarsat-A system
- Inmarsat-B system
- Inmarsat-C system
- Inmarsat-D system
- Inmarsat-M system
- Inmarsat-P system
- integrated telephone system
- integrated videographic teleconferencing system
- integrated-antenna system
- integrated-communication system
- integrated-modulation system
- integrated-office system
- Intelsat system
- interactive system
- intercarrier-sound system
- intercommunication system
- intercontinental tropospheric system
- interlock system
- intermachine exchange system
- intermediate system
- international communication system
- interphone system
- Intervision system
- intraband signaling system
- intruder alarm system
- inward-outward dialing system
- ionoscatter system
- ionosphere sounder system
- ionospheric system
- Iridium system
- isolated system
- Italsat system
- J-carrier system
- joint-multichannel trunking and switching system
- K-carrier system
- key system
- key-telephone system
- land satellite communication system
- large-grained communication system
- laser communication system
- L-band satellite system
- L-carrier system
- Leasat system
- lightning protection system
- limited distortion system
- line amplifiers system
- link system
- little-channel relay system
- local alarm system
- local battery system
- local communication system
- local radio paging system
- long-haul system
- long-range system
- loop system
- loud-speaking communication system
- low-traffic system
- magnetic tape recording system
- Mail system
- management-information system
- manual cellular system system
- manual telephone set system
- Marisat system
- master television system
- master-antenna television system
- matrix sound system
- message feedback system
- message procession system
- message registration system
- message-switched system
- meteor radio system
- Metrobus system
- micro component system
- Micro Press Cluster Printing system
- micro-lens system
- microprocessor system
- microwave relay system
- midi system
- mine radio telephone system
- mini system
- mixed media system
- mixed numbering system
- mobile cellular communication system
- mobile land communication system
- mobile radio system
- mobile relay system
- mobile system
- modulated system
- monetary mobile system
- MS-Mail system
- multiareal system
- multicassette system
- multichannel telephone system
- multicomputer system
- multidisk system
- multiformat recording system
- multifrequency tone signaling system
- multiguard system
- multilevel mixed system
- multimedia system
- multiple-channel system
- multiqueue system
- Multiscrypt system
- multistandard system
- multitrack editing system
- mutibeam antenna system
- muting system
- Nagravision system
- NAMTS system
- narrow-angle TV system
- national communication system
- navigation system
- n-channel communication system
- n-channel DPSK system
- n-channel transmission system
- network standalone system
- network system
- network-operation system
- networks numbering system
- neutral direct-current telegraph system
- n-head video system
- NMT system
- noise-reduction system
- nonhoming tuning system
- noninterlaced television system
- nonsegmented system
- Norsat system
- n-satellite system system
- n-tone DPSK system
- n-tone MFSK system
- NTSC system
- NTT system
- obligatory message system
- Odyssey system
- off-line system
- on-line computer system
- on-line secured system
- open numbering system
- open system
- operative-engineering communication system
- opposite signals system
- optical-communication system
- optical-information system
- optical-projection system
- optoelectronic system
- oscillating system
- oscillation system
- outband signaling system
- package-and-resource tracking system
- pagemaster system
- paging system
- PAL system
- parametric system
- PATHWORKS system
- pattern recognition system
- personal holding guard system
- phase shift-keying system
- phone system
- Piccolo system
- pilot-controller system
- polar direct-current telegraph system
- portable mobile system
- power control system
- power controlling system
- power-line carrier system
- power-supply system
- press-to-talk system
- Prestel system
- primary-supply system
- privacy system
- private branch paging system
- private movable system
- private videodata system
- private videotex system
- process-interface system
- PROFS system
- programmable cross-connect system
- programmable cross-connected system
- programmed radio system
- prompting system
- protected wireline distribution system
- protection system
- pseudoquadraphony system
- pseudotrunking system
- public videodata system
- public videotex system
- pulse-code system
- pulse-frequency system
- pulse-time system
- quadraphonic sound system
- quadruple-diversity system
- R1 system
- R2 system
- radio buoy system
- radio command system
- radio communication system
- Radio Data system
- radio facsimile system
- Radiocom 2000 system
- radio-control system
- radio-paging system
- radio-relay system
- radiosonde-radio-wind system
- radio-telemetering system
- real time pulse-echo system
- real time system
- receiver lockout system
- recording system
- recovery system
- redundant system
- reference-information system
- regional electronic payment system
- relay-radio system
- remote concentrating system
- remote control system
- remote diagnostic system
- remote information system
- remote semiconcentrating system
- remote sensing system
- remote signaling system
- rendering system
- rerecording system
- reserved servicing system
- RF/Transmission system
- rotary system
- safety alarm system
- safety system
- Satcom system
- satellite comminication system
- satellite marine comminication system
- Satellite Master Antenna Television system
- satellite radio system
- satellite-aircraft communication system
- SB-communication system
- SBL communication system
- scalable system
- scanning trunking system
- SCO UNIX system
- searchless identification system
- seat reservation system
- SECAM system
- second generation cellular system
- second room system
- secondary supply system
- secrecy system
- section communication system
- security system
- segmented system
- seismic system
- selective calling system
- selective frequency base station system
- selective protective system
- selective telephone system
- self-adjusting system
- self-balancing differential system
- self-contained system
- self-test system
- selsyn system
- semiautomatic-switching system
- semiautomatized cellular system
- sensory system
- servo system
- shadow-batch system
- short-haul microwave system
- Sicral system
- Sigma Servo system
- signal system
- simplex movable system
- single-band transmission system
- single-busbar system
- single-cable communication system
- single-cable system
- single-channel system
- single-current transmission system
- single-pulse tracking system
- Skynet system
- small-grained communication system
- SmarTrunk II radio communication system
- solid-state uninterruptible power battery system
- Sony bus system
- sound alarm system
- sound equalization system
- sound navigation system
- sound reinforcement system
- sound warning system
- space-division system
- space-switched system
- spark-safe system
- speaker system
- special communication system
- speech-processing system
- speech-recognition system
- split-speaker system
- spread-spectrum system
- stabilizing system
- stage monitoring system
- standalone double point system
- star-circuit system
- STAREX CMX system
- starting communication system
- start-stop system
- stationary satellite system
- step-by-step system
- stereo sound system
- stereophonic sound system
- storage system
- storage-and-retrieval system
- Strowger system
- submarine fiber-optic system
- subprimary digital transmission system
- subscriber carrier system
- subscriber switching system
- suffix system
- Supersat system
- supervisory control system
- surround sound system
- switched telecommunication system
- switching system
- sync communication system
- synchro system
- synchronous communication system
- synchronous digital system
- TAGS system
- tandem system
- tariffication system
- T-carrier system
- TDF system
- teleautomatic system
- Telecom system
- telecommunication system
- telecommunications system
- telecommunication-service priority system
- telecommunications-service priority system
- telecontrol system
- telemechanic system
- telemetering system
- telemetry system
- telephone system
- telephone-answering system
- telephone-communication system
- telephone-communications system
- teleprocessing system
- Telesat system
- teletex system
- teletypewriter system
- television-telephone system
- Tele-X system
- Telsar system
- terminal system
- terrestrial radio-relay system
- theft-prevention system
- thin-route system
- third generation communication system
- three-axle stabilizing system
- three-channel HF-telephone system
- three-channel transmission system
- three-color system
- three-lens optical system
- three-primary system
- three-wire system
- time-dissemination system
- time-frequency hopping system
- time-switched system
- total access communication system
- total area coverage system
- transmission system
- trichromatic system
- triple-interlace system
- triplex system
- trunk communication system
- TV-observation system
- twelve-channel transmission system
- two-arm system
- two-band system
- two-color system
- two-roller transfer system
- two-step control system
- two-way CATV system
- two-way system
- two-wire telephone communication system
- ultra-match system
- ULTRIX system
- unified radioaccess system
- unilateral-control system
- unilateral-synchronization system
- uninterruptible-power system
- Unisat system
- universal alarm system
- universal-battery system
- universal-electronic system
- universal-movable system
- Uniworks system
- vestigial-sideband system
- video editing system
- video home system
- video recording system
- videocom system
- videoteleconference system
- videotex system
- virtual studio system
- vision system
- vocoder system
- voice dialog system
- voice frequency carrier telegraph system
- voice modulation system
- voice post system
- volume control system
- waiting system
- warning system
- watch system
- watching system
- waterside facsimile communication system
- wave-propagating system
- wide-angle TV system
- Winfax Pro system
- wired broadcasting system
- wireless CCTV system
- wireless home system
- wireless infrared speaker system
- wire-radio communication system
- XY system
- zone-selective protection system
- zoning system

- administrative-economic communication
- advanced shipboard communication
- aerial communication
- aeronautical communications
- air steward-to-air steward telephone communication
- airborne SHF-communication
- airborne-to-Earth communication
- aircraft communication
- air-to-air communication
- air-to-air voice communication
- air-to-ground electric communication
- Airways and Air communications
- all-mine telephone communication
- analog tropospheric communication
- analog-to-digital communication
- annunciating communication
- antenna communication
- asynchronous communication
- audio-conference communication
- audio-visual communication
- auroral long-distance communication
- automatic trunk communication
- auxiliary communication
- babyphone communication
- basic communication
- bathysphere-to-carrier-ship communication
- bidirectional communication
- binary-synchronous communication
- boat emergency communications
- both-way simultaneous communication
- branch telephone communication
- broadcast communication
- carrier-current communication
- car-to-car communication
- coastal center-to-coastal center communication
- code-independent data communication
- coherent-light communication
- combine wall communication
- command-telephone communication
- common-service communication
- common-using telegraph communication
- common-using telephone communication
- component triaxial communication
- computerized communication
- computer-to-computer communication
- conductor-to-departure responsible communication
- conference communication
- confidential special radio communication
- contact network communication
- contactless HF-communication
- contingency communication
- continuous communication
- control communication
- data communication
- data-transmission communication
- departmental engineering communication
- departmental telegraph communication
- digital communication
- digital-speech communication
- direct communication
- direct-pair communication
- direct-telephone communication
- disaster communication
- dispatch communication
- display communication
- distress communication
- district-by-district communication
- diversity communication
- diver-to-diver communication
- diving-service communication
- document electric communication
- documental conference communication
- duplex communication
- duplex radiotelephone communication
- Earth-to-airborne communication
- Earth-to-satellite communication
- Earth-to-space-to-Earth communication
- either-way communication
- electrical communication
- electromagnetic communication
- electronic communication
- emergency communication
- emergency ship radio communication
- enciphered-facsimile communication
- engineering station communication
- engineering-telephone communication
- everyone-to-everyone communication
- face communication
- fast-acting telephone communication
- fire-place communication
- fixed aeronautical communication
- fixed-electric communication
- fleet communication
- frequency-hop communication
- gateway-to-gateway communication
- ground-line communication
- group engineering communication
- half-duplex communication
- harmonic communication
- H-carrier communication
- HF-communication
- high-speed mobile communication
- house-car communication
- hydroacoustic communication
- incoming communication
- inductive mines communication
- industrial communication
- industrial-automatic communication
- industrial-engineering communication
- in-plant communication
- interaction communication
- interpaging communication
- interstation communication
- interstellar communication
- intersystem communication
- intraairplane telephone communication
- intrabasin selector communication
- intrabasin telegraph communication
- intrabasin telephone communication
- intrairport communication
- intraship communication
- intratrain telephone communication
- irregular communication
- isochronous communication
- land mobile communication
- land-to-space communication
- letter-printing communication
- lighting wire communication
- line communication
- line-path communication
- line-track telephone communication
- littoral radiotelephone communication
- local common service communication
- local engineering communication
- local telephone communication
- long-haul communication
- long-haul fiber-optical communication
- long-haul telephone communication
- loud-speaking communication
- main conference communication
- main engineering communication
- main radio communication
- manoeuvre radio communication
- man-to-machine communication
- marine communication
- marine facsimile communication
- meteor-burst communication
- meteoric-ionospheric communication
- microwave communication
- militarized guard communication
- mobile aeronautical communication
- mobile communication
- moon-bounce communication
- moorage-by-moorage communication
- movable communication
- MT administration-to-road communication
- multicast communication
- multichannel communication
- multimedia communication
- multiple channel class A communication
- multiple channel class B communication
- multiple channel class C communication
- multiple channel system radio communication
- multipoint communication
- navigating-service communication
- n-way communication
- office communication
- operative communication
- operative-dispatch communication
- operative-managing communication
- operative-repairing communication
- operator-to-train mobile communication
- oral communication
- outgoing communication
- packet communication
- passband data communication
- passenger-to-locomotive driver communication
- passenger-to-policemen communication
- phase-locked communication
- phototelegraph communication
- pilot-to-steward telephone communication
- plane-to-plane communication
- platform announcing communication
- platform radio communication
- platform-to-train mobile communication
- point-to-point communication
- power dispatch communication
- power line communication
- private bypass communication
- private-branch communication
- private-branch industrial communication
- pulse communication
- radial communication
- radial-aerial USB-communication
- radio link communication
- radio relay communication
- radio searching communication
- radiotelephone communication
- railway telephone communication
- real-time communication
- recording communication
- regional communication
- regular communication
- remote reference communication
- road communication
- road engineering communication
- road managing communication
- road power dispatch communication
- road service dispatch communication
- road servicing communication
- road telegraph communication
- rural communication
- safety communication
- satellite marine communication
- satellite-to-Earth communication
- satellite-to-satellite communication
- SB communication
- secure communication
- selector communication
- service communication
- service dispatch communication
- service section communication
- SHF-wave communication
- ship coastal facsimile communication
- ship-driver-to-ship-driver communication
- ship-radio communication
- ship-telephone communication
- ship-to-ship communication
- ship-to-spacecraft communication
- ship-to-submarine communication
- shore-to-ship communication
- short-band communication
- simplex communication
- simplex single-frequency communication
- simplex stripping communication
- simplex two-frequency communication
- single-channel communication
- single-frequency radio communication
- single-hop communication
- single-side loudspeaking communication
- sky-wave communication
- slope telephone communication
- sonic communication
- space communication
- space laser communication
- spacecraft-to-subscriber communication
- space-to-space communication
- special communication
- speech communication
- static-wire communication
- station communication
- station inductive communication
- station mobile communication
- station-by-station telephone communication
- station-radio communication
- steering cab-to-captain's cab communication
- steering cab-to-power dispatchboard communication
- steering cab-to-tiller compartment communication
- submarine laser communication
- submarine sound communication
- submarine TV-communication
- submarine-to-satellite communication
- submarine-to-submarine communication
- subscriber-to-workgroup communication
- switch point communication
- synchronous communication
- telegraphic communication
- telegraphic-telephone radio communication
- telephonist-to-diver communication
- telex communication
- ticket-dispatch communication
- time-bill communication
- train dispatch communication
- train inductive communication
- train radio communication
- train radiotelephone communication
- train radiowire telephone communication
- train-interstation communication
- train-master-to-station-master assistant communication
- train-master-to-train team communication
- train-to-movable object communication
- train-to-train radio communication
- transport police communication
- tropospheric communication
- tropospheric-scutter communication
- trunk communication
- tunnel train radio communication
- twilight scutter communication
- two-frequency radio communication
- two-side loudspeaking communication
- two-way alternative communication
- two-way simultaneous communication
- ultrasonic communication
- ultraviolet communication
- underground communication
- undersea optical communication
- underwater communication
- unwired earth current communication
- USB-communication
- variable frequency sync communication
- vehicle-to-vehicle communication
- videoconference communication
- videotelephone communication
- voice communication
- wagon-to-wagon mobile communication
- wall communication
- waterside communications
- waterside USB-communication
- wave conducting communication
- wire port communication
- wire radio communication
- wire telephone communication
- workgroup-to-workgroup communication
- world-wide telephone communication

- anisotropic exchange
- area exchange
- auto-manual telephone exchange
- automatic exchange
- automatic message exchange
- automatic telephone exchange
- branch exchange
- circuit switching exchange
- common-battery exchange
- community automatic exchange - data exchange - dial exchange
- digital exchange - double exchange - group selector exchange
- heat exchange
- indirect exchange
- intergranular exchange
- international exchange
- international program exchange - isotropic exchange
- key exchange
- local exchange
- magneto exchange
- manual exchange
- metallic crosspoint exchange
- minor exchange
- momentum exchange
- negative exchange
- office network exchange - parent exchange
- positive exchange - query exchange
- radiation exchange
- retransmission exchange
- satellite exchange
- self-contained automatic exchange
- semiautomatic exchange
- semielectronic exchange
- sequenced packet exchange - strong exchange
- tandem exchange
- telegraph exchange
- telephone exchange
- teletypewriter exchange
- telex exchange
- terminal exchange
- trunk exchange
- tunneled exchange of light
- TV program exchange
- weak exchange

- analog exchange
- anisotropic exchange
- area exchange
- auto-manual telephone exchange
- automatic exchange
- automatic message exchange
- automatic telephone exchange
- branch exchange
- circuit switching exchange
- common-battery exchange
- community automatic exchange
- computerized branch exchange
- crossbar exchange
- data exchange
- data switching exchange
- data-transmission exchange
- dial exchange
- digital exchange
- digital matrix exchange
- direct exchange
- double exchange
- dynamic data exchange
- electronic automatic exchange
- electronic exchange
- enterprise mail exchange
- exchange for a system of extensions
- frame relay exchange
- global Internet exchange
- graphics exchange
- group selector exchange
- heat exchange
- indirect exchange
- intergranular exchange
- international exchange
- international program exchange
- Internet key exchange
- internetwork packet exchange
- ion exchange
- isotropic exchange
- key exchange
- local exchange
- magneto exchange
- manual exchange
- metallic crosspoint exchange
- minor exchange
- momentum exchange
- negative exchange
- office network exchange
- open systems message exchange
- packet switching exchange
- parent exchange
- positive exchange
- private automatic branch exchange
- private automatic exchange
- private branch exchange
- private exchange
- private manual branch exchange
- quasi-electronic exchange
- query exchange
- radiation exchange
- retransmission exchange
- satellite exchange
- self-contained automatic exchange
- semiautomatic exchange
- semielectronic exchange
- sequenced packet exchange
- software exchange
- space-division exchange
- step-by-step exchange
- stored-program controlled telephone exchange
- strong exchange
- tandem exchange
- telegraph exchange
- telephone exchange
- teletypewriter exchange
- telex exchange
- terminal exchange
- trunk exchange
- tunneled exchange of light
- TV program exchange
- weak exchange

- access switch
- air-break switch
- air-pressure switch
- alignment switch
- allotter switch
- analog switch
- analog-digital switch
- antenna switch
- antitransmit-receive switch
- ATM-switch
- automatic reclosing switch
- backbone switch
- band switch
- battery switch
- branch switch
- bus-bar sectionalizing switch
- call switch
- change-tune switch
- coaxial switch
- code switch
- communication switch
- congested switch
- controlled switch
- cord switch
- cradle switch
- crossbar switch
- cross-point switch
- data transfer switch
- decimal-binary switch
- deck switch
- desktop switch
- differential switch
- digital switch
- discharge switch
- disconnecting switch
- discriminating switch
- distribution switch
- electronic switch
- emergency switch
- emulation switch
- engineering communication switch
- Ethernet switch
- fallback switch
- fax-to-telephone switch
- feeder switch
- ferrite switch
- fiber-optic switch
- field-discharge switch
- forward/reverse switch
- four-layer switch
- fuse switch
- gang switch
- gate-controlled switch
- group switch
- Hall-effect switch
- heterodyne/exciter switch
- hitless switch
- hook switch
- hunting switch
- INPUT SELECTOR switch
- input-buffer switch
- instant-on switch
- key switch
- lightning switch
- light-operated switch
- line switch
- line-finder switch
- load switch
- local switch
- logic switch
- loudness switch
- magnetic-reed switch
- magnetooptical switch
- mains switch
- master switch
- memory-time switch
- mode select switch
- multiple-contact switch
- multiple-way switch
- multiplex switch
- multiplexer switch
- muting switch
- n-channel switch
- nonblocking switch
- n-port managed switch
- n-way switch
- on-off switch
- option switch
- optoelectronical switch
- output buffer switch
- ovonic memory switch
- packet switch
- pilot switch
- polarity switch
- power switch
- programmed switch
- pull switch
- pull-cord switch
- push-button switch
- push-to-talk switch
- quick-break switch
- quick-make switch
- radio aids switch
- radiotelephone switch
- REC SELECTOR switch
- reciprocal ferrite switch
- redundancy switch
- reed switch
- reset switch
- resonator-chamber switch
- reversing switch
- ring switch
- rotary-stepping switch
- routing switch
- sampling switch
- selector switch
- self-restoring switch
- sensor mode switch
- sequence switch
- shared-buffer switch
- shared-medium switch
- shared-memory switch
- sharing-selector switch
- short-circuiting line switch
- shuttle switch
- silicon-symmetrical switch
- single-pole switch
- snap switch
- snap-acting switch
- solid-state switch
- source switch
- step-by-step switch
- stud switch
- subscriber line switch
- system switch
- talk-listen switch
- terminal switch
- test-mode switch
- thin-film optical switch
- thyristor switch
- time switch
- time-delay switch
- toggle switch
- toll offering switch
- touch switch
- touch-sensitive switch
- transfer switch
- transistor switch
- trigger switch
- trunk switch
- tumbler switch
- turbo switch
- unmanaged switch
- wave-band switch
- waveguide switch