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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.
There is a volume control in the base of the telephone with 'loud', 'medium' and 'soft' settings (a silent setting was achieved by slackening off a screw on the tone ringer board inside the phone). Production of the new telephone commenced in 1965 by STC, and an initial quantity of 1,000 was offered to customers on a selective trial basis in ...
A 220 Trimline rotary desk phone, showing the innovative rotary dial with moving fingerstop Early Touch Tone Trimline with round buttons and clear plastic backplate and round non-modular handset cord Redesigned touch-tone desk model Trimline, manufactured on January 9, 1985 The Trimline 2225, one of the last phones made at the Indianapolis Works in 1986 Early foreign made Trimline, December ...
In addition, Advanced American Telephones manufactured phones serve as a portrayal of AT&T's home phone service and are seen in ads for it. Phones made today by Advanced American Telephones primarily include cordless telephones and some corded phones, such as Trimline, and some multi-line desk phones. Advanced American Telephones also holds the ...
The ringing pattern is known as ring cadence, in which the high voltage ring current is switched on and off to create the pattern. In North America, the standard ring cadence is two seconds of ringing followed by four seconds of silence. In Australia and the UK, the standard ring cadence is 400 ms on, 200 ms off, 400 ms on, 2000 ms off.
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The setting itself is part of the price; to set it with a diamond will increase the cost. Some customers looking for engagement rings believe they will walk out of the store with a ready-made ring ...
In many cases, the cadence consists of a double ring of 0.4 seconds separated by 0.2 seconds, and a two second pause after which the cadence repeats (0.4s on, 0.2 s off, 0.4 s on, 2 s off). In many cases the tone is a combination of 400 Hz and 450 Hz sine waves.