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From: ssc!tad@beaver.cs.washington.edu (Tad Cook)
Newsgroups: comp.dcom.telecom
Subject: Re: Touchtone History
Message-ID: <10250@accuvax.nwu.edu>
Date: 30 Jul 90 19:28:03 GMT
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X-Telecom-Digest: Volume 10, Issue 530, Message 6 of 11


In article <10035@accuvax.nwu.edu>, drivax!marking@uunet.uu.net
(M.Marking) writes:

> ssc!tad@beaver.cs.washington.edu (Tad Cook) writes:

> ) In article <9706@accuvax.nwu.edu>, drivax!marking@uunet.uu.net
> ) (M.Marking) writes:

> ) > *Dual* Tone Multi Frequency.) The frequencies are:
> ) > 
> ) > 			1209	1336	1477	1653 Hz
> )                                                 ^^^^WRONG!

> ) Actually, the fourth column tone is 1633 Hz.

> You seem to be right. It seems I reached for the wrong reference 
> first. 1633 Hz is the choice of:

(lists three references)

These typos are common throughout the technical references.  Another
one that is frequently misstated is 1477 Hz, which is often misprinted
as 1447 Hz.  I think REFERENCE DATA FOR RADIO ENGINEERS had that one a
few years ago, and other folks spread it from there.


Tad Cook   Seattle, WA   Packet: KT7H @ N7HFZ.WA.USA.NA   Phone: 206/527-4089 
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