Telephony

The calling tone is 80 Vrms (more or less 10 Vrms). So 1,41*90 Vpeak =

127Vpeak. And there is the necessity of capacitors to filter the DC signal when the phone is not being used (about 48Vdc). About call-waiting tone signal, It is a acoustic signal. I measured 0,2-0,5Vrms but my multimeter isn't true rms.

PH

VRMS

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We call that the "ringing signal".

J F I followed you mesgs here a little bit. did a search on google and came up with this one:

question: does this work? do you need a special modem to detect the tone? rw

I am and my multimeter are very fast. I am joking :-)

My thought: provided that it is a acoustic/audible signal, that has the same amplitude when I am talking to telephone :-) Or no? hahahaha, that is, maybe it isn't necessarily true!

Do you know any way to measure it?

PH

one:

It works really. Read the past messages! You can get the same function adding the string +PCW=1 if your modem supports call waiting. But we want to learn to make that. Do you understand? We don't want only to use the modem :-)

PH

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Yes, it works.  Read some of the OP\'s posts to that effect.

You need a modem which supports call-waiting detection.  The spec is
provided on the web page, I think.

Why is difficult to find those informations? Google for "+PCW=1 modem v 92" and you will find only few pages. Why?

Pedro Henrique

JF,

What do OP mean, please?

PH

if you're talking about the AT Hayse commands, I find them easy.

ect..

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"I\'m never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

easy.http://www.modem.com/general/extendat.htmlhttp://www.modemsite.com/56k/hcf9.asp

Only one of them refers to +PCW string. I want to mean that those informations aren't found easily from modem manufacturers.

PH

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Original Poster.  That is, the poster who started the thread.

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Probably because its not really a "hot" topic.