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A Nokia 5800 showing its modes, including silent mode. Silent mode is a setting available on mobile phones and pagers that, when activated, disables the ringtones and, in some cases, also the vibrating alerts or alarm.
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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.
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.
Hanging up the phone after this would result in a ring back. When the ring back was answered, the ring back process could be repeated by hanging up and lifting up the phone quickly again, and then hanging up. Most other numbers listed for ringback are specific to one exchange or one telco; available lists tend to be outdated and unreliable.
"Many dogs don’t prefer to sleep in their owners’ beds, and that’s normal too," Askeland says. Next: The #1 Sign Your Dog Is Stressed, According to Experts Sources:
Image credits: crimsonbaby_ #5. My Dad was [taken from us] before I was born. When I was still in elementary school, I would feel someone tightening the cover on my bed at night.
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.