TELECOM Digest OnLine - Sorted: Re: Speed Dials

Re: Speed Dials

TELECOM Digest Editor (
Mon, 11 Sep 2006 20:13:57 EDT wrote on the topic of Speed Dials:

TELECOM Digest Editor noted in response to Lisa Hancock:

>> [TELECOM Digest Editor's Note: Plus which, on (at least the older) AE
>> rotary dial phones, the dial would return 'faster' when you removed
>> your finger. WE dials pulsed and clicked their way back. PAT]

> The dial speed is about 10 pulses per second. (A good modem manual
> will tell you exactly the "contact make/break" times and the settings
> for outside the U.S. as well).

> Anyway, I believe panel switching and certainly crossbar and ESS could
> and would accept 20 pulses per second. Way back in HS a kid figured
> out on his phone dial an adjustment to make it 20 p/s and it worked
> (on either #1 xbar or panel). PBX switchboards had 20 p/s dials.

> However, I think they realized this higher speed was rough on
> equipment and did not provide it to the general public for that
> reason. I don't know if SxS could handle it but SxS components had
> wear issues and certain improvements was rough on SxS unless it was
> carefully spread out among switches within an office.

I tried an experiment once with a Hayes modem and tone dialing. I kept
setting the 'dialing speed' faster and faster on the modem so that
eventually, instead of getting a faster and faster 'beep, beep, bloop'
sound as it was 'dialing' or toning out its signal it got to where
the modem was 'toning out' its signal in just two or three seconds
total. Central office was still able to keep up with that pace on the
touchtone speed, but then I set the modem to get it all out in about
one or two seconds -- just an audible blur, no way for the naked ear
to make anything out of it -- and then about half the time, my call
'could not be completed as dialed'. If I slowed it down just a pinch,
so that ten digits still reached the central office in about three or
four seconds, it always heard me and made the right connection. I did
_not_ think touch tone signals could be interpreted that fast, but on
ESS I guess they can be.


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