Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: john@zygot.ati.com (John Higdon) Newsgroups: comp.dcom.telecom Subject: Re: Touchtone Fee Abolished in CA Message-ID: <9619@accuvax.nwu.edu> Date: 11 Jul 90 01:37:46 GMT Sender: news@accuvax.nwu.edu Reply-To: John Higdon Organization: Green Hills and Cows Lines: 39 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 475, Message 8 of 9 In article <9532@accuvax.nwu.edu> Heath Roberts writes: >line card itself: there's one per subscriber loop in the switch. So >you can't really just ask about "100% coverage". It doesn't work that >way. Trying to provide more touch-tone service without adding capacity >is like trying to push a thousand cars an hour down a two lane road: >things back up, everybody gets slowed down, etc. You have to add extra >lanes in the long run. Whenever a telco orders a switch, it has a pretty good idea what the traffic patterns will be on it. Since it was necessary to know in the old crossbar days how many "originating registers" would be required in a particular application, it is similarly necessary to know how many TT receivers will be required in a digital switch. Mr. Heath's implication is that an unlimited number rotary subscribers can be off hook dialing calls. Not true. The switch must be configured for expected traffic whether it be rotary or TT. TT receivers are cheap and a relatively few of them can serve many subscribers. >Software's also getting to be more and more complex, so >telcos are spending proportionally more on software than they used to. >These costs are the reason I think I'm justified in saying that CLASS >features, although not "advanced" in concept, and even though they're >pretty common, cost operating companies more to provide than POTS. Not to mention writing their own. Some telcos (like Pac*Bell) buy source licenses with their digital switches. This not only brings down the cost of individual features, but allows the telco to provide services that don't come with the equipment in the first place. Pac*Bell offers a number of subscriber features on the NT DMS100 that are not available from the manufacturer. John Higdon | P. O. Box 7648 | +1 408 723 1395 john@zygot.ati.com | San Jose, CA 95150 | M o o !