Xref: utzoo comp.dcom.modems:8849 comp.unix.questions:29570 comp.unix.admin:1298 Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!uwm.edu!bionet!hayes.ims.alaska.edu!floyd From: floyd@ims.alaska.edu (Floyd Davidson) Newsgroups: comp.dcom.modems,comp.unix.questions,comp.unix.admin Subject: Re: DSZ ZMODEM problem Message-ID: <1991Mar19.054147.9873@ims.alaska.edu> Date: 19 Mar 91 05:41:47 GMT References: <1991Mar16.190010.21805@cs.wayne.edu> <1991Mar18.151002.1423@crom2.uucp> Organization: University of Alaska, Institute of Marine Science Lines: 39 In article t22918@ursa.calvin.edu (Matt Ranney) writes: >jim@crom2.uucp (James P. H. Fuller) writes: > >>and try to download stuff using dsz they get lots of timeouts and error re- [...] >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? Another source of problems, both in talking to Procomm on a DOS machine, and going through a terminal server, is XON/XOFF flow control. It needs to be turned off everywhere. Packet numbers that are the same as XOFF will shutdown one end and cause timeouts. On terminal servers there are usually a number of other "editing" or "control" characters that can get you into trouble. The terminal server must be put into a "passthru" or "passall" mode. Floyd -- Floyd L. Davidson | floyd@ims.alaska.edu | Alascom, Inc. pays me Salcha, AK 99714 | Univ. of Alaska | but not for opinions.