Path: utzoo!attcan!uunet!hayes!tnixon
From: tnixon@hayes.uucp (Toby Nixon)
Newsgroups: comp.dcom.modems
Subject: Re: Do US-made modems work in the UK?
Message-ID: <2263@hayes.uucp>
Date: 22 Oct 90 13:08:55 GMT
References: <1990Oct16.133001.271@computing-maths.cardiff.ac.uk> <2174@hayes.uucp> <2489@root44.co.uk>
Organization: Hayes Microcomputer Products, Norcross, GA
Lines: 23

In article <2489@root44.co.uk>, jgh@root.co.uk (Jeremy G Harris)
writes: 

>>DTMF dialing is standardized worldwide (CCITT Recommendation Q.23). 
> 
> Just because it is standardised in a CCITT Recommendation doesn't
> automatically make it universally available.
> Pulse dialling is usable anywhere in the UK.  Tone isn't.

Fine, but that's not what he asked.  He DID ask whether DTMF was the 
same everywhere, and that's the question I answered.

Unfortunately, pulse dialing is NOT the same everywhere.  You find 
variations in the make/break ratio, pulse rate, separation between 
digits, etc.  A pulse-dial modem in the US might very well NOT work 
on a pulse-dial exchange in the UK or elsewhere.  But you can be 
pretty sure a DTMF modem WILL work.

-- 
Toby Nixon, Principal Engineer   | Voice:   +1-404-449-8791  AT&T:  !tnixon
Hayes Microcomputer Products Inc.| Fax:     +1-404-447-0178  CIS: 70271,404
P.O. Box 105203                  | UUCP: uunet!hayes!tnixon  MCI:  267-0805
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