Xref: utzoo comp.dcom.modems:8847 comp.unix.questions:29565 comp.unix.admin:1296 Newsgroups: comp.dcom.modems,comp.unix.questions,comp.unix.admin Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!t22918 From: t22918@ursa.calvin.edu (Matt Ranney) Subject: Re: DSZ ZMODEM problem Message-ID: Sender: news@engin.umich.edu (CAEN Netnews) Organization: The University of Michigan, Ann Arbor References: <9857@jjmhome.UUCP> <1991Mar16.190010.21805@cs.wayne.edu> <1991Mar18.151002.1423@crom2.uucp> Date: 19 Mar 91 04:23:32 GMT jim@crom2.uucp (James P. H. Fuller) writes: >and try to download stuff using dsz they get lots of timeouts and error re- >covery and a very low transfer rate. My modem is a T2500 with the registers >optimized (as best I can) for unix/uucp. Also my rz/sz is fairly old, since >it's what came as a freebie on the disk Omen Tech sent me when I registered >dsz-for-DOS a couple of years ago. Would a newer rz/sz help, or is it my >modem settings or something else? My serial card has only a 16450 UART, but >all the errors happen even at 2400bps, so it doesn't seem that the lack of >a buffer is the problem. I'm having almost the same problem. I think I know where the problem lies (at least in out situation). All calls on our campus go through various terminal servers. These terminal servers are connected to the various machines via a 38K baud Ethernet link. But, since the highest supported incoming line's speed is 9600 baud, at LOT of bufferig is taking place in the terminal server. So, say you get one error, your terminal tries to tell the host that you have an error, but the host still has 8 or 9K more of data that you are going to get wether you like it or not. End result: VERY low transfer rates, and lots of "Garbage count exceeded" message on the PC end. So, the problem could be solved by just getting sz/rz to talk to me at my particular baud rate (command line flag). Can this be done? -- Matt Ranney mranney@wybbs.mi.org t22918@ursa.calvin.edu mranney@mole.ai.mit.edu (or any other FSF machine)