Peter Cousens wrote:
>
> >  Does anybody have some specs or pointers to Telephone Pulse Dialing
> > protoc. Pulse timing, interdigit times and so on.
> >
> >> Mark is 33.3ms, space is 66.6 ms
> >> You will find it fairly international.
> >>
>
> Anyone have the min. interdigit time

I really think you may need about 330ms for reliable operation on an old
relay type exchange, if that's what you are chasing Peter.

I recall the 33/66 ms timing was done with a set of brass wings in a
small cup that acted as a govenor. You adjusted it so a zero produced an
even 1 second timing. The time between digits was the time taken to get
your finger into say number 1, the closest to the stop, and set it ready
to dial. If you forced it with a pencil, you could beat the mechanical
steppers, and end up with an incorrect number.

If you are driving a digital exchange, then I dare say, you could
shorten all timings considerably.

And different countries I'm sure will have different standards.

Don McKenzie  mailto:don@dontronics.com   http://www.dontronics.com

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