TELECOM Digest OnLine - Sorted: Re: Bell Divestiture

Re: Bell Divestiture

Tony P. (
Wed, 22 Jun 2005 17:13:22 -0400

In article <>,

> [TELECOM Digest Editor's Note: I had a couple of Hayes Modems which
> could be switched between pulse and tone dialing, and you could set
> the 'speed' of the pulsing or the 'speed' of the tone signals. You
> could make both modes go quite fast; with tone dialing so fast that
> it was little more than just a single blip in your ear, and most
> times it would work quite well. Only on occassion the modem would
> give its short little blip or tone burst when dialing *before* the
> line was set up to allow it, and you would have to redial, but
> usually it worked okay. PAT]

Yes I remember those Hayes modems. We use to run the DTMF at 30ms on ESS
switches, and 70ms on SxS switches that were adapted to interpret DTMF.

In some cases with a good pair you could get as low as 20ms but it
wasn't reliable.

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