TELECOM Digest OnLine - Sorted: Re: Dial/Touch Tone Speeds

Re: Dial/Touch Tone Speeds

Paul Coxwell (
Mon, 27 Jun 2005 10:05:37 +0100

> I never tinkered with changing the pulse rate, but
> there were AT commands to do that as well. I think in foreign
> countries the "make/break" ratio of pulses was different and I didn't
> want to risk screwing up my modem/software with an oddball setting.

Yep. Here in England it was common to have an AT&P1 command in the
initialization string to set the modem to a 67/33 ratio. In practice,
the default U.S. setting almost always worked perfectly anyway. I
don't recall ever having problems on the default setting when dialing
out from the small SxS office which served my area in the early 1980s.

The make/break ratio would probably become a problem only if tolerances
on a particular switch were right on the limits.

- Paul.

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