Path: utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!brutus.cs.uiuc.edu!wuarchive!texbell!vector!telecom-gateway
From: bovine!john@apple.com (John Higdon)
Newsgroups: comp.dcom.telecom
Subject: Re: Call Progress Signals Needed
Message-ID: 
Date: 15 Aug 89 01:11:16 GMT
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X-TELECOM-Digest: volume 9, issue 298, message 10 of 12

In article , userDBUG@ualtamts.BITNET
(Dan Berry) writes:
> I was interested in finding out the tone plans for the typical phone
> system's call progress signals, but I can't seem to be able to find
> them in any of my books!  You know, the frequencies for a dial tone,
> busy signal, ringing and the rest of them.  From someone else that
> I've talked to, they made mention that only some four frequencies
> were used to get some 20+ signals.  dB's and timing too, S.V.P.


All of the information you seek in the Radio Engineer's Handbook. I
don't have my copy at hand, but it's widely available and in it's
umpteenth edition. Everything you ever wanted to know about telephony
hardware is in that book.

--
        John Higdon         |   P. O. Box 7648   |   +1 408 723 1395
      john@zygot.uucp       | San Jose, CA 95150 |       M o o !