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Message Digest
Volume 28 : Issue 164 : "text" Format
Messages in this Issue:
Re: Pulse vs. touch tone, was ANI
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Date: Tue, 16 Jun 2009 08:16:36 -0700
From: Sam Spade <sam@coldmail.com>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: Pulse vs. touch tone, was ANI
Message-ID: <pHOZl.1385$LV4.1255@newsfe02.iad>
hancock4@bbs.cpcn.com wrote:
> On Jun 9, 9:53 am, John Levine <jo...@iecc.com> wrote:
>
>
>> Because it's slower. When you're dialing a number, the switch needs
>> to allocate a digit buffer (which has some other telco name I forget)
>> until you've dialed all the digits, and that takes several times
>> longer with pulse dialing. The switch needs to include enough buffers
>> to handle the peak hour number of simultaneously dialed calls.
>
>
> I believe a switch has some sort of status word containing various
> details of the call, and this exists for the duration of the call. It
> is built as the call progresses.
>
> In any event, computer memory is so incredibly cheap these days the
> cost of a some extra memory is trivial relative to the total cost of
> the switch. Think about how cheap PC memory has become and how much
> you get today compared to just ten years ago, let alone 20 years ago.
>
> There is no extra cost to provide pulse dialing.
What do you say to the argument about the cost of assigning real-time
priorities to the switch's CPU? The gentleman who commented on that
seem to have a great grasp of the concept.
Either hardware has to be present to buffer the origination dial pulsing
or the switch has to "see" it as it's happening. I suppose the call
program could create a software file each time someone goes off-hook but
that would represent processor time as well.
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