telephone instrument
41End instrument — In telecommunications an end instrument is a technical term for the piece of equipment connected to the wires at the end of a telecommunications link. In most cases, this is a telephone …
42L'interprétation par téléphone — Interprétation Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom …
43GPO telephones — The United Kingdom s General Post Office (GPO) had a number of telephones that were provided by them for connection to their exchanges. Until 1982 the GPO had a monopoly on the provision of all telephones within the UK and so the range was… …
44Ringdown — 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… …
45Otto Julius Zobel — Born October 20, 1887(1887 10 20) Ripon, Wisconsin Died January 1970 (age 82) Morristown, New Jersey …
46Acoustic coupler — In telecommunications, the term acoustic coupler has the following meanings: # An interface device for coupling electrical signals by acoustical means usually into and out of a telephone instrument. # A terminal device used to link data terminals …
47Ringback tone — A Ring back Tone (RBT), or Audible Ringing Tone or Ring back Signal, is the audible ringing that is heard on the telephone line by the calling party after dialing and prior to the call being answered at the receiving end. This tone assures the… …
48Magneto — 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 …
49Automatic redial — In telecommunication, an automatic redial is a service feature that allows the user to dial, by depressing a single key or a few keys, the most recent telephone number dialed at that instrument. Note: Automatic redial is often associated with the …
50Local battery — In telecommunication, the term local battery has the following meanings: #in telegraphy, the source of power that actuates the telegraphic station recording instruments, as distinguished from the source of power that furnishes current to the line …
