Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!pilchuck!ssc!tad
From: tad@ssc.UUCP (Tad Cook)
Newsgroups: sci.electronics
Subject: Re: Phone Dial Tones
Summary: dialtone
Message-ID: <775@ssc.UUCP>
Date: 13 Jan 91 19:42:08 GMT
References: <1991Jan9.102713.10815@bernina.ethz.ch>
Distribution: sci
Organization: very little
Lines: 43

In article <1991Jan9.102713.10815@bernina.ethz.ch>, hb9zz@bernina.ethz.ch (Marco Zollinger) writes:
> I'm devlopping a little databank program for the atari st and need the frequecy
> of the dial tones and eventually the waveform.
> 

Standard dialtone in North America is 350 plus 440 Hz.

You didn't want the frequencies for standard Dual Tone Multifrequency
tone dials, did you?

Here is the scheme:


          1209hz        1336hz       1477hz

697hz       1             2            3

770hz       4             5            6

852hz       7             8            9

941hz       *             0            #


When dialing a digit one, you get 1209+697 hz.  A digit will put out
the tones for the row and column that it is in.

There is also a fourth column at 1633 hz available, but I am assuming
that this is not for military autovon networks!

Levels should be about -9 to -6dbm (275 to 388 mv) across the line,
with about the levels about the same, or the high frequency a db or two
hotter.


Tad Cook
Seattle, WA
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