Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bbn!apple!sun-barr!texsun!texbell!vector!telecom-gateway From: westmark!dave@rutgers.edu (Dave Levenson) Newsgroups: comp.dcom.telecom Subject: Re: answering machine and dialup modem. Message-ID: Date: 21 May 89 13:24:18 GMT Sender: news@vector.Dallas.TX.US Organization: Westmark, Inc., Warren, NJ, USA Lines: 30 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 173, message 3 of 7 In article , khl@cunixc.cc.columbia. edu (Kenneth H. Lee) writes: > ... Line 1 is supplied via the RED/GREEN pair > while line 2 is supplied via the BLACK/YELLOW pair of the jacks. > > My problem is that when I am logged onto any system via my > dialup modem and my answering machine answers my phone, my modem drops > carrier and my session drops. I can also hear my modem carrier > whenever I use line 1 and the modem is in use. I think there are two problems here: The answering machine is probably configured/designed to interwork with 1A2 key telephone units, and is shorting the second pair when it answers the first pair. That can probably be corrected by changing the configuration options to "SINGLE LINE" or something like that in the answering machine. If it doesn't have configuration options, modify its cord so that it only connects to one pair. The crosstalk is caused by running two lines in the same quad station wire. Use cables with two (or more) twisted pairs, and the crosstalk should be eliminated. -- Dave Levenson {uunet | rutgers | att}!westmark!dave ...the man in the mooney