Path: utzoo!telecom-request Date: Fri, 7 Jun 91 08:49 PDT From: John Higdon Newsgroups: comp.dcom.telecom Subject: Re: Modem Trouble on Subscriber Loop Carrier Reply-To: John Higdon Message-ID: Organization: Green Hills and Cows Sender: Telecom@eecs.nwu.edu Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 436, Message 7 of 11 Lines: 32 Jim Hickstein writes: > One of my users tried to dial in from home recently, only to discover > that the modem spit out garbage continually. I notice in your .signature a number that is in the Junction Ave. office. This place is packed with 5ESS, so what you describe could very well be a bad subscriber interface card in the switch. With digital, it can sound perfect and be totally unusable for data, for reasons I'll let others explain. > Thinking fast, I explained that certain adaptive compression and other > fancy techniques can cause trouble for modem users. He mentioned that > a representative of Pac*Bell had said that they "guarantee service > only for voice data [sic]". Call them back and tell them to check the handbook again. Pac*Bell considers the line to be meeting minimal spec IF it passes 2400 bps data. This they do guarantee. In other words, if you cannot get your 2400 bps modem to work through Pac*Bell facilities, then there is prima facie evidence that the line is not meeting minimal voice spec and someone should look into it. Oh, and do not be afraid to suggest things such as subscriber interface circuits (on the 5ESS). The days are long gone where those who knew ANYTHING about telco were immediately suspect. John Higdon | P. O. Box 7648 | +1 408 723 1395 john@zygot.ati.com | San Jose, CA 95150 | M o o !