Path: utzoo!attcan!uunet!samsung!dali.cs.montana.edu!uakari.primate.wisc.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!julius.cs.uiuc.edu!ux1.cso.uiuc.edu!news.cs.indiana.edu!iuvax!silver!herrj From: herrj@silver.ucs.indiana.edu (Jonathan R. Herr) Newsgroups: comp.dcom.modems Subject: Re: INFO-MODEMS Digest V90 #286 Message-ID: <71393@iuvax.cs.indiana.edu> Date: 13 Nov 90 01:17:42 GMT References: <3182.27310BB8@zswamp.fidonet.org> <1990Nov5.172154.9486@bigsur.uucp> Sender: news@iuvax.cs.indiana.edu Organization: Misters Mom Anonymous Lines: 31 In article <1990Nov5.172154.9486@bigsur.uucp> mussar@bcars53.uucp (G. Mussar) writes: >Zmodem sends 10 bit async chars (1 start, 8 data and 1 stop). With non-MNP, >these chars are sent between the modems as 10 bits each as well. This means >that maximum performance is limited to 2400/10 = 240 chars/second (minus any >Zmodem overhead). I think 234 is about right. >Gary Mussar |Bitnet: mussar@bnr.ca Well, I hate to disagree (okay, I like to) but at 2400 bps, my STAR modem *regularly* transfers at rates in excess of 250 cps on ZIP'ed files from another 2400 bps modem. Neither of us run MNP anything. And this is using Zmodem. However, it does seem to degrade as the files get larger (ie. > 120K). This is also with only this one particular BBS. It seems that the other BBS's around town carry a lot of line noise or suffer the effects of transferring through a network before getting to the modem (at least those are the only reasons that I can think of). I did, on one occassion only, achieve 260 cps transferring a large text file (ie. ~200K). Is this simply a fluke in the protocol or are our modems working faster than normal? Jonathan R. Herr | Don't wait to see me. Send e-mail. I don't herrj@silver.ucs.indiana.edu| always make it to campus but always get home. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I'd clone myself if I could and get twice as much done in a single day.