A Absolute gain (physics) Adaptive communications ADSL loop extender AIDR Anisochronous Articulation score Asynchronous communication Asynchronous operation Attack time Attenuation to crosstalk ratio Audit (telecommunication) Audit trail Autonomous telepresence Availability Available Revenue Time Average call duration B Back-channel Back-to-back connection Balance return loss Bearer service Bill shock Bipolar signal Black facsimile transmission Black recording Blind transmission BORSCHT Building Integrated Timing Supply Business internal dialing Busy hour Busy hour call attempts C Call Detail Record Call shop Call-second Called subscriber identification Called party Calling party Carrier Ethernet Carrier frequency Carrier grade Carson bandwidth rule Channel reliability Channel state information Clock domain crossing Combined distribution frame Comfort noise Communications jamming Communications survivability Communications, Media and Entertainment Complementary code keying Contention (telecommunications) Continuous transmission mode Conventional radio Crosstalk (electronics) Customer proprietary network information D Data compaction Data link Data rate units Degree of start-stop distortion Demand load Demarc extension Design layout record Dial peer Dialer Dialer Management Platform Directive gain Distortion-limited operation Distribution frame D cont. Disturbance voltage Diversity combining Drop (telecommunication) E Effective Earth radius Effective data transfer rate Effective transmission rate End instrument Erlang (unit) Error vector magnitude Extinction ratio F Facility (telecommunications) Falsing Wikipedia:Federal Standard 1037C terms/telecommunication network terms Wikipedia:Federal Standard 1037C terms/telecommunication service terms Feeder line (network) Femtocell Five by five Fixed Dialing Number Four-wire terminating set Full width at half maximum G Gating (telecommunication) Global Title Ground constants H Hagelbarger code Halftone characteristic Hard copy Harvard sentences Hierarchical cell structure High Speed Link Hop count Hybrid balance I IDTV Independent clocks Index of cooperation Information transfer Information-bearer channel Information-transfer transaction Intelligent Network Interface Device Interchange circuit Intercharacter interval Intermediate distribution frame International gateway Interposition trunk K K-factor (telecommunications) Kendall effect Keying (telecommunications) Krone LSA-PLUS L Layered system Link (telecommunications) Link margin List of telephony terminology Loading Local Dialing Disparity Location Area Identity Logic Trunked Radio Longitudinal voltage Loop gain Loop start M Main distribution frame Maximal-ratio combining Media gateway Mediation function Meet-me-room Mesochronous network Message format Misdialed call Mobile Internet growth M cont. Mobile phone penetration rate Mobile phone signal Mobile switching centre server Modulation error ratio Multipoint Control Unit N NGOSS Naked DSL Narrowcast Net gain NetExpert Network interface device Noise temperature Non-line-of-sight propagation O Objective Systems Integrators On-hook Operations support system Operator logo Optical modulation amplitude Optical power budget Optical power margin Out-of-band infrastructure Overmodulation P Personal numbering Phantom circuit Phase noise Phase perturbation Pilot signal Plesiochronous Plesiochronous difference Post over IP Power budget Power ramp Priority call Proceed-to-select Processing delay Propagation constant Protective distribution system Psophometric voltage Public call office Public data transmission service Pulse duration Q Qualdir Quantization error Quasi-analog signal Queuing delay R Radio silence Rayleigh fading Received noise power Receiver attack-time delay Recovery procedure Reference noise Reflection coefficient Release time (telecommunication) Remote call forwarding Round-trip delay time Route reestablishment notification Routing and wavelength assignment (RWA) Rural radio service S Serial access Service Control Point Signal reflection Signal compression Signal regeneration Signal transition Simplex circuit Slave station