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Re: LF: Re: Ringing Voltage on Telephone, boo-boo

To: [email protected]
Subject: Re: LF: Re: Ringing Voltage on Telephone, boo-boo
From: [email protected]
Date: Thu, 8 Nov 2001 01:50:49 EST
Reply-to: [email protected]
Sender: <[email protected]>
I don't know how it is in Canada, but in the States, the 20Hz component is the only ringing voltage sent across the line to the telephone set, which can readily be confirmed by sticking a blocking capacitor and a bridging transformer acorss the line and looking at the result directly on an oscilloscope. The modulated audio frequency tones are sent from the switching office back to the caller, not to the recipient.

Locally, the ringing voltage is 90V RMS, riding on the normal on-hook DC of about 50 volts.

73,
John


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