In smaller offices, a special Sub-Cycle magnetic oscillator was used.
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In large Central Offices, there were 48VDC motor-driven generator sets for both ringing & other signals such as dial tone and busy signals. (SLC is a trademark of Alcatel-Lucent, but is a term often used generically.]This ring voltage came from various sources. This is done at the Central Office, or a neighborhood multiplexer called a "SLC" for Subscriber Line Carrier. On a POTS interface, this signal is created by superimposing ringing voltage atop the -48VDC already on the line. Variation of the ring signal can be used to indicate characteristics of incoming calls (for example, rings with a shorter interval between them might be used to signal a call from a given number).A ringing signal is an electric telephony signal that causes a telephone to alert the user to an incoming call. In Australia the ring signal averages 100 V AC at 25 Hz.While the sound produced is still called a “ring”, more-recently manufactured telephones electronically produce a warbling, chirping, or other sound. Some non-Bell system party lines in the US used multiple frequencies (20/30/40 Hz, 22/33/44 Hz, etc.) to allow "selective" ringing. In Europe it is around 60-90 volts AC at a frequency of 25 hertz. The ringing signal sent to a customer's telephone is 90 volts AC at a frequency of 20 hertz in North America.
This electromagnetic bell system is still in widespread use. The aforementioned electrical signal powered the electromagnets which would rapidly move and release the clapper, striking the bells. The term originated from the fact that telephones originally had a ringing mechanism consisting of bells and an electromagnetically-driven clapper, producing a ringing sound. For mobile phones, the network sends the phone a message indicating an incoming call.Ī telephone “ring” is the sound generated when there is an incoming telephone call. For landline telephones, the call signal can be an electric current generated by the switch or exchange to which the telephone is connected.
A phone “rings” when its network indicates an incoming call and the phone thus alerts the user.
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