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

[WarmSpgs@aol.com]

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