haskins@s.cs.uiuc.edu (09/24/88)
I just got a Hayes 2400 external modem for use at home. It works fine at 2400 baud, no noise or any other trouble, BUT when I use it at 1200 baud on a couple UNIX machines here, I get lines and lines of garbage and usually have to hang up. It usually doesn't start util I've been online for about 30 seconds. I thought it was line noise, but with an anonymous 1200 baud internal modem, I NEVER get any noise, and with a TEAM 1200 external, I hardly get any. I guess that my phone lines aren't the cleanest in the world, but I don't know why it's the Hayes box that's the worst of the lot. I know it's between the modem and the phone company because when I get the garbage, RD lights up with it. I tried another Hayes 2400 external, but the same thing happened. I even tried CCITT as well as Bell. I'm using PibTerm 4.1.3 with the same config file for each modem. I hope this doesn't mean I have to go to a cheaper modem (snicker). Anybody else have this problem, or have any ideas? ---------------------------------------------- Lloyd Haskins -- haskins@cs.uiuc.edu Department of Computer Science -- University of Illinois
berger@clio.las.uiuc.edu (09/28/88)
What modems are you dialing on the other end? Can you confirm that your baud rates at both ends are within specification (-1.5% to +1%)? I found a machine that had a baud rate slightly high (+1.2%), and it worked with some very cheap modems but not very well with the premium grade modems. Fixing the baud rate clock solved our problems. Mike Berger, U of Il. Dept. of Statistics berger@clio.las.uiuc.edu
tboutell@vax1.acs.udel.EDU (Thomas B Boutell) (10/09/88)
Your difficulties aren't unique. I've also seen the same problem on Hayes 2400 baud units; apparently the 1200 baud side of the box was neglected. I ran a bulletin board for several years with a Racal- Vadic 1200, which became known as the only system the Hayes 2400 users could contact at 1200 without receiving a mess. Perhaps Hayes only tested the unit against 100%- perfect equipment. Sure enough, when I moved to another, reasonably reliable but not sterling modem, the Hayes 2400 callers had problems once more. I wouldn't be too quick to jump for another make of unit, though; I've tried several 2400 baud off- brand units and been pretty much disgusted with each. I've had particularly poor luck with the "DeskTalk 2400" from Comark.
judy@moray.UUCP (Judy Scheltema) (10/09/88)
In article <2034@udccvax1.acs.udel.EDU> tboutell@vax1.acs.udel.EDU (Thomas B Boutell) writes: >Your difficulties aren't unique. I've also seen the same problem on Hayes >2400 baud units; apparently the 1200 baud side of the box was neglected. I also ran into the same problem when using my Hayes 2400 to call a 1200 baud board. All I got was garbage. If I set the modem at 1200 baud *before* initiating the call, everything was fine. One just could not call a 1200 baud board with their modem starting out at 2400. I've also seen the instance when using noisy lines a 2400 baud US Robotics falls back to 1200 and the Hayes tries to connect with it at 1200 and again it's garbage. I suspect the Hayes is falling back to 1200 CCITT rather than 1200 Bell 2.12a. (But that's a guess.) -- Judy Scheltema | uunet!nuchat!moray!judy | cs.utexas.edu!uhnix1!moray!judy Houston, Texas | bellcore!tness1!moray!judy
haskins@s.cs.uiuc.edu (10/12/88)
I'm the original poster of the note on Hayes 2400 trouble at 1200 baud. I've tried logging onto 1200 baud systems starting at both 1200 and at 2400 baud, and the results are the same. I guess what was said earlier about the 1200 baud section being picky and/or neglected may be true. The modems I connect to at school have probably seen better days. BTW, I've tried both using CCITT (or whatever it is, I don't have the manual with me) and Bell, to no avail. I haven't yet tried to communicate with Hayes, which might be the right thing to do. When I have the time. ---------------------------- Lloyd Haskins -- haskins@cs.uiuc.edu