TELECOM Digest OnLine - Sorted: Re: Hayes Smartmodems (was Re: Bell Divestiture)

Re: Hayes Smartmodems (was Re: Bell Divestiture)

Tony P. (
Thu, 23 Jun 2005 17:23:48 -0400

In article <>, TELECOM Digest Editor
noted in response to

>> [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]

> I had a Hayes 300 modem when 1200 baud was considered astronomically
> fast. I kept it until I upgraded to a Hayes 2400 baud modem. I think
> both of them are still in one of my goody boxes put away, for all the
> good they'll be to me now.

> I had become very familar with the Smartmodem when it first came out.
> I was working for MCI at the time. One day, we got a phone call from
> a salesman who was at one of our customer sites. This customer had
> several MCI long distance lines hooked up to his PBX. The salesman
> had sold them a Smartmodem 1200 but was unable to make it work through
> the PBX. When the customer mentioned the MCI lines, the salesman
> pointed the finger at MCI.

> So the customer called and put the salesman on the phone with one of
> our people. That person just happened to know I knew a lot about the
> Smartmodem and transfered the salesman to me.

> I got him to describe the setup. Then I asked him how he was making
> it dial. He told me that he was typing in 'ATD9,' and then the area
> code and the number.

> I knew immediately what was wrong when he said that. I told him to
> try typing in 'ATDT9,' and the area code and the number. He took this
> attitude that how could a telephone technician know anything about a
> Smartmodem.

> I asked him what he had to lose by trying it. So, finally, he did.

> I heard him typing, then I heard the dial tone from the Smartmodem,
> then I heard it outpulse digit 9 in DTMF. I then heard secondary
> dialtone and then the area code and number outpulsed in DTMF.

> Then, I heard the distant modem answer, the local modem respond in
> carrier, and then the speaker went silent.

> I then heard the salesman shout, 'IT WORKS'. Then he came back to the
> telephone. His voice was showing that he was very embarrassed.

> I knew I was going to laugh out loud, so I needed to get off the phone
> quickly. I told him I was glad to help him and that he should call me
> back if he ever needed more help. Thank you and goodbye, so to speak.
> I laughed hysterically for several minutes after I got off the phone.

> The boss was very grateful. This was a customer we wanted to keep a
> very good relationship with. He thanked me very much.

> When Hayes designed the Smartmodem, they should have had the unit
> default to touch-tone instead of outpulsing rotor dialing by default.
> Incidents like this could have been avoided. I happened to know that
> this customer's PBX did not support rotary dialing. The 'T' I added
> to the string switched the unit from default rotary dialing to touch
> tone. Problem solved.

> Regards,

> Fred Atkinson

> [TELECOM Digest Editor's Note: I think we used 'ATT' for tone dialing
> and 'ATP' for pulse dialing.

Actually it was ATD and ATDT if you wanted to be fussy. AT was the
attention grabber, followed by the command and then any parameters.

If I recall correctly you could set one of the S registers to a value
to default DTMF dialing on ATD.

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