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- Q2174765 subject Q6892398.
- Q2174765 subject Q8762084.
- Q2174765 abstract "A ringing signal operates a bell or other ringtone generator in a telephone, to alert the user to an incoming telephone call. In landline telephones, bells or ringtones are rung by impressing a 60 to 105-volt RMS 20-Hertz sine wave across the tip and ring conductors of the subscriber line, in series with the (typically) -48VDC loop supply. This signal is produced by a ringing generator at the central office. When the subscriber line is called, a relay on the subscriber line card connects the ringing generator to the subscriber line. The exchange also sends a ringback tone to the calling party. When the called party answers by taking the telephone handset off the switchhook, the subscriber's telephone draws direct current from the central office battery. This current is sensed by the line card and the ringing relay is de-energized.".
- Q2174765 wikiPageWikiLink Q10371827.
- Q2174765 wikiPageWikiLink Q11035.
- Q2174765 wikiPageWikiLink Q1162746.
- Q2174765 wikiPageWikiLink Q1378949.
- Q2174765 wikiPageWikiLink Q1462168.
- Q2174765 wikiPageWikiLink Q1488337.
- Q2174765 wikiPageWikiLink Q159241.
- Q2174765 wikiPageWikiLink Q204896.
- Q2174765 wikiPageWikiLink Q223323.
- Q2174765 wikiPageWikiLink Q2296401.
- Q2174765 wikiPageWikiLink Q256132.
- Q2174765 wikiPageWikiLink Q2603074.
- Q2174765 wikiPageWikiLink Q390750.
- Q2174765 wikiPageWikiLink Q457875.
- Q2174765 wikiPageWikiLink Q484921.
- Q2174765 wikiPageWikiLink Q5021881.
- Q2174765 wikiPageWikiLink Q5022190.
- Q2174765 wikiPageWikiLink Q5282971.
- Q2174765 wikiPageWikiLink Q6502269.
- Q2174765 wikiPageWikiLink Q6553232.
- Q2174765 wikiPageWikiLink Q6892398.
- Q2174765 wikiPageWikiLink Q690856.
- Q2174765 wikiPageWikiLink Q7099767.
- Q2174765 wikiPageWikiLink Q747865.
- Q2174765 wikiPageWikiLink Q7808786.
- Q2174765 wikiPageWikiLink Q7921621.
- Q2174765 wikiPageWikiLink Q81945.
- Q2174765 wikiPageWikiLink Q8762084.
- Q2174765 wikiPageWikiLink Q942297.
- Q2174765 comment "A ringing signal operates a bell or other ringtone generator in a telephone, to alert the user to an incoming telephone call. In landline telephones, bells or ringtones are rung by impressing a 60 to 105-volt RMS 20-Hertz sine wave across the tip and ring conductors of the subscriber line, in series with the (typically) -48VDC loop supply. This signal is produced by a ringing generator at the central office.".
- Q2174765 label "Ringing (telephony)".