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ringing current

См. также в других словарях:

  • Ringing — ElectricityIn electrical circuits, ringing is an unwanted oscillation of a voltage or current. It happens when an electrical pulse causes the parasitic capacitances and inductancesFact|date=May 2008 in the circuit (i.e. those that are not part of …   Wikipedia

  • ringing key —    Key that transmits a ringing current …   IT glossary of terms, acronyms and abbreviations

  • Change ringing software — The Blue Line of Plain Bob Minor produced by change ringing software. Change ringing software encompasses the several different types of software in use today in connection with change ringing. Contents 1 …   Wikipedia

  • AC-DC ringing —    Telephone ringing that uses alternating current to operate a ringer and direct current to stop the ringing when the called party answers …   IT glossary of terms, acronyms and abbreviations

  • Ringtone — For the Weird Al Yankovic song, see Ringtone (song). For the film, see Ringtone (film). A ringtone or ring tone is the sound made by a telephone to indicate an incoming call or text message. Not literally a tone, the term is most often used today …   Wikipedia

  • Telephone exchange — A telephone operator manually connecting calls with cord pairs at a telephone switchboard. In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central… …   Wikipedia

  • Number Five Crossbar Switching System — The Number Five Crossbar Switching System or 5XB switch, designed by Bell Labs and made by Western Electric, was in use in Bell System telephone exchanges from 1948 to the 1980s. Its principal use was as a Class 5 telephone switch, though… …   Wikipedia

  • Ringer equivalence number — In telecommunication, a ringer equivalency number (REN) is a somewhat arbitrary number which denotes the electrical load a telephone ringer has on the line. In the U.S., this is determined in accordance with the Code of Federal Regulations ,… …   Wikipedia

  • Ringdown — Ringdown: In telephony, a method of signaling an operator in which telephone ringing current is sent over the line to operate a lamp or cause the operation of a self locking relay known as a drop . Ringdown (a) is used in manual operation, as… …   Wikipedia

  • Magneto — For other uses, see Magneto (disambiguation). Demonstration hand cranked magneto A magneto is an electrical generator that uses permanent magnets to produce alternating current. Hand cranked magneto generators were used to provide ringing current …   Wikipedia

  • Model 500 telephone — Western Electric model 500 set made in 1951 By 1975, the Model 500 layout …   Wikipedia

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