dual-tone signaling
21Аббревиатуры телефонии — Эта страница глоссарий. Аббревиатуры, используемые в телефонии и связи …
22Rotary dial — A German Fe TAp 615, (R g) a widespread rotary dial telephone of the 1960s to the 1980s The rotary dial is a device mounted on or in a telephone or switchboard that is designed to send electrical pulses, known as pulse dialing, corresponding to… …
23Answer supervision — is a term in telephony, describing a situation whereby the called party indicates to the central office that the call is being answered by the called party. by allowing loop current to flow in the line.OverviewCAS E M Signaling BasicsFor digital… …
24Bell (instrument) — See also: Tubular bell For the part of a wind instrument, see Wind instrument#Parts. Bell Parts of a typical bell: 1. yoke, 2. crown, 3. head, 4. shoulder, 5. waist …
25DTMF — See dial, dual tone multifrequency, dual tone multifrequency signaling …
26Modulation — For musical change of key, see Modulation (music). For other uses, see Modulation (disambiguation). Passband modulation v · d · e …
27Interactive voice response — IVR redirects here. For other uses, see IVR (disambiguation). Interactive voice response (IVR) is a technology that allows a computer to interact with humans through the use of voice and DTMF keypad inputs. In telecommunications, IVR allows… …
28Frequency-shift keying — Passband modulation v · d · e Analog modulation AM · …
29Citizens' band radio — Typical 1980s CB base station, used with outdoor antenna. This radio may also be used in an automobile, since it is powered by 13.8V DC. Shown with Astatic Power D 104 desk mic …
30Marine VHF radio — A standard handheld maritime VHF, mandatory on larger vessels under the GMDSS rules …
