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Volume 28 : Issue 164 : "text" Format

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  Re: Pulse vs. touch tone, was ANI 

====== 27 years of TELECOM Digest -- Founded August 21, 1981 ====== Telecom and VOIP (Voice over Internet Protocol) Digest for the Internet. All contents here are copyrighted by Patrick Townson and the individual writers/correspondents. Articles may be used in other journals or newsgroups, provided the writer's name and the Digest are included in the fair use quote. By using -any name or email address- included herein for -any- reason other than responding to an article herein, you agree to pay a hundred dollars to the recipients of the email. =========================== Addresses herein are not to be added to any mailing list, nor to be sold or given away without explicit written consent. Chain letters, viruses, porn, spam, and miscellaneous junk are definitely unwelcome. We must fight spam for the same reason we fight crime: not because we are naive enough to believe that we will ever stamp it out, but because we do not want the kind of world that results when no one stands against crime. Geoffrey Welsh =========================== See the bottom of this issue for subscription and archive details and the name of our lawyer, and other stuff of interest. ---------------------------------------------------------------------- Date: Tue, 16 Jun 2009 08:16:36 -0700 From: Sam Spade <> To: Subject: Re: Pulse vs. touch tone, was ANI Message-ID: <pHOZl.1385$LV4.1255@newsfe02.iad> wrote: > On Jun 9, 9:53 am, John Levine <> 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. ------------------------------ TELECOM Digest is an electronic journal devoted mostly to telecom- munications topics. It is circulated anywhere there is email, in addition to Usenet, where it appears as the moderated newsgroup 'comp.dcom.telecom'. TELECOM Digest is a not-for-profit, mostly non-commercial educational service offered to the Internet by Patrick Townson. All the contents of the Digest are compilation-copyrighted. You may reprint articles in some other media on an occasional basis, but please attribute my work and that of the original author. The Telecom Digest is currently being moderated by Bill Horne while Pat Townson recovers from a stroke. Contact information: Bill Horne Telecom Digest 43 Deerfield Road Sharon MA 02067-2301 781-784-7287 bill at horne dot net Subscribe: telecom Unsubscribe: telecom This Digest is the oldest continuing e-journal about telecomm- unications on the Internet, having been founded in August, 1981 and published continuously since then. Our archives are available for your review/research. We believe we are the oldest e-zine/mailing list on the internet in any category! URL information: Copyright (C) 2008 TELECOM Digest. All rights reserved. Our attorney is Bill Levant, of Blue Bell, PA. ************************ --------------------------------------------------------------- Finally, the Digest is funded by gifts from generous readers such as yourself who provide funding in amounts deemed appropriate. Your help is important and appreciated. A suggested donation of fifty dollars per year per reader is considered appropriate. See our address above. Please make at least a single donation to cover the cost of processing your name to the mailing list. All opinions expressed herein are deemed to be those of the author. Any organizations listed are for identification purposes only and messages should not be considered any official expression by the organization. End of The Telecom digest (1 message) ******************************

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