Ringing (telephony)

（重定向自Ringing generator）

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) −48 VDC loop supply. This signal is produced by a ringing generator at the central office.

单词	Ringing generator
释义	Ringing generator 英语百科 Ringing (telephony) （重定向自Ringing generator） 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) −48 VDC loop supply. This signal is produced by a ringing generator at the central office.
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