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A ring generator or ringing voltage generator is a device which outputs 20 cycle sinusoidal AC at up to 110 volts peak to power bells or annunciators in one or more telephone extensions. [4] The output stops if a handset is taken off the hook. In terminology devised by phone phreaks, a ringing generator is a magenta box.
Ringing noise from an electromechanical telephone Example of a short digital tune which could be used as a ringtone on a mobile phone. A ringtone is the sound made by a telephone to indicate an incoming telephone call. Originally referring to the sound of electromechanical striking of bells or gongs, the term refers to any sound by any device ...
Also known as caller tunes in some countries, such as India, [6] [better source needed] ringback music is a service offered by mobile network operators that allows subscribers to select a melody, music, tone, song or even personalized recorded sounds as a Ring-Back tone for all of their callers.
Unlike in the public telephone network, which has a standard ringing cadence (the repeating pattern of ringing and silence), the ringing cadence when using a magneto depended on the skill of the operator. When ringing local extensions, some switchboard operators used local codes of ringing to indicate internal, external or urgent calls.
Some dial tones were simply adapted from 60 Hz AC line current. In the UK, the standard Post Office dialing tone was 33 Hz; it was generated by a motor-driven ringing machine in most exchanges and by a vibrating-reed generator in the smaller ones. Some later ringing machines also generated a 50 Hz dial tone.
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The most significant distinction between ordinary telephones and sound-powered telephones is in the operation of the microphone. Since the microphones used in most telephones are designed to modulate a supplied electric current they cannot be used in sound-powered transducers. Most sound-powered telephones use a dynamic microphone.