Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!uwm.edu!mixcom!sysop From: sysop@mixcom.UUCP (System Operator) Newsgroups: comp.dcom.modems Subject: Re: Practical Peripherals Tech Support Message-ID: <93@mixcom.UUCP> Date: 8 Dec 90 15:45:12 GMT References: <28617@usc> Organization: MIX Communications, Milwaukee, WI (Public access Usenet, Email) Lines: 40 In article eggbert@bucsf.bu.edu (Eugene Wang) writes: > >I haven't tried calling a PP9600SA since I know of no others. Does >anyone know where I could to try this out? > I am using a PP 9600 for dial-in service on a UNIX computer used for computer data transfers (email, Usenet). The problem I see is 2400/1200 non-error correcting modems calling, the PP answering, connecting then immediately dropping the connection. I have not tried this at plain V.32. Repeated attempts will usually result in a connect the PP holds (2 -3 calls). If you enable error correction on the same modem used to call, the connection is made and held first time. I was able to reproduce this behavior calling with a USR Dual Std. This is particularly evident when the PP 9600 is connected to a DigiBoard multiport serial board. It happens less often when connected to a "com" port, which makes no sense to me unless the RS232 electrical characterics of the PP 9600 differed when an error correcting call occurs vs a non-error correcting call. (If you have another explanation, my email box is open :-) Some modems, such as a PP 2400 I have, will not talk with the 9600 at all, but will connect with other modems. That might be the fault of the 2400, not the 9600. After extensive conversations with PP, I am going to put my USR Dual Std. on the system and see if it behaves the same as the PP 9600. (Note: there are several 2400s that have been working fine for months. The PP 9600 is the first to exhibit unusual behavior.) I will also perform other tests in an attempt to definitively isolate the source of the problem. Dean Roth -- Milwaukee Information eXchange (MIX), public access *NIX/Usenet MIX Communications, P.O. Box 17166, Milwaukee, WI 53217