Xref: utzoo comp.dcom.modems:7512 comp.sources.d:6009 Path: utzoo!utgpu!watserv1!watmath!att!linac!pacific.mps.ohio-state.edu!tut.cis.ohio-state.edu!mstar!mstar.morningstar.com!bob From: bob@MorningStar.Com (Bob Sutterfield) Newsgroups: comp.dcom.modems,comp.sources.d,osu.network Subject: TB2500 doing V.32 to osu-cis Message-ID: Date: 29 Nov 90 21:00:48 GMT Sender: usenet@MorningStar.COM (USENET Administrator) Reply-To: bob@MorningStar.Com (Bob Sutterfield) Organization: Morning Star Technologies Lines: 96 In article bob@MorningStar.Com (Bob Sutterfield) writes: We have a Telebit Trailblazer 2500 that we use (among other things) to get to osu-cis for UUCP. All is well using PEP to osu-cis' directly connected Trailblazer Plus. However, when that TB+ is busy [or broken], we'd like to be able to use OSU's V.32/MNP5 modems and the campus Micom switch to get to osu-cis at 9600bps. Our fallback thus far has been at 2400bps via the same path. When I dial by hand using the same register settings as in the Dialers line (details below), I'm able to raise osu-cis as expected. However, when uucico chews through its chat script, and gets to the point where it's finally talking directly to osu-cis and expects a "login:" to appear, it sees strings of null bytes and other noisy-looking stuff. One might almost believe that there were parity or stop bit mismatches, except that I'm able to do the same thing by hand with no problems at all. Also, we're able to get through at 2400bps, though that uses a different bank of modems at OSU. I recently received the new version of the T2500 ROMS (GF7.00) and attacked this once again. Here's what I found, excerpted and paraphrased from a mail message. I'll include, at the end, the Systems and Dialers lines that work for us. Sorry to be so long-winded, but I wanted to let others know what worked for me, and what I understand of why. Date: Thu, 29 Nov 90 15:22:52 EST From: bob@MorningStar.Com To: karl_kleinpaste@tut.cis.ohio-state.edu Subject: success! (was: humor me) Date: Wed, 28 Nov 90 22:13:55 -0500 From: Let me know what you learn. If I connect to OSU's 9600bps modems using our T2500 in V.32, then I can't get a login banner from the Pyramids when going directly through the OSU Micom switch (lotsa noise characters). If I go through an IP terminal server then all is well, but only if I hadn't used any MNP error correction when I dialed the Micom switch. If I use MNP4 and/or MNP5 and pass through a terminal server, then I don't get anything from the Pyramid past the password: prompt (there's a "login -r c3po..." or "login -r lettuce..." running on the Pyramid, but it never transmogrifies into a uucico.) Oddly enough, I can talk to those same modems (614-292-3196) using our T2500 at 2400bps with MNP4 and MNP5 enabled with no problem at all, whether going directly to the Pyramid or passing through a terminal server. I only have difficulties at 9600bps V.32 with MNP4 and MNP5. I'm now happily doing UUCP between mstar and osu-cis using mstar's Telebit T2500 with its MNP and V.42 features disabled, and passing through a terminal server rather than going directly to the Pyramid. Unfortunately, when I get a noisy line, the V.32 might retrain down to several steps slower than 9600 and/or the uucico might retransmit a lot, which reduces the throughput. If I could use MNP4 or V.42 then uucico probably wouldn't retransmit so much, but I have no way to measure that. I'm also seeing the effects of Sonngate (a Bridge CS/1) not being a very fast terminal server, along with passing through several IP routers and a Proteon ring along the way. Right now (midafternoon) I'm seeing UUCP throughputs on large files of around 500 bytes/sec, whereas that same modem can pump 1400-1500bytes/sec over PEP to another unloaded machine with a directly-connected Trailblazer. Whew! At least, at times like now when your TB+ is broken, I don't feel like I'm sucking a full news feed through a very thin straw. Here's what works for us. From Systems: # direct to the Pyramid doesn't work #osu-cis Any;1 ACU 19200v 2923196 "" \d\r\d\r\d\r\d\r Name? osu-cis nected \c nected \c GO \d\d\d\d\d\d\r\d\r in:--in:--in: Umstar word: ratsmU osu-cis Any;1 ACU 19200vnomnp 2923196 "" \d\r\d\r Name? sonngate GO \d\r\d\r ohio-state.edu \c selection\s: 1 help)\s: osu-cis.cis\semacs in:--in: Uanon From Devices: ACU tty14 - 19200v tbv32 ACU tty14 - 19200vnomnp tbv32nomnp From Dialers: # # Telebit Trailblazer 2500 # # MNP5 (compression) tbv32 =W-, "" A\pA\pATZ\r\dAT OK AT OK ATx3s58=0s7=60s8=5s92=0s50=6s111=0s95=2s96=1s51=5DTW\T CONNECT\s9600/REL # MNP4 (error correction, but no compression) #tbv32 =W-, "" A\pA\pATZ\r\dAT OK AT OK ATx3s58=0s7=60s8=5s92=0s50=6s111=0s95=2s96=0s51=5DTW\T CONNECT\s9600/REL # no MNP tbv32nomnp =W-, "" A\pA\pATZ\r\dAT OK AT OK ATx3s58=0s7=60s8=5s92=0s50=6s111=0s95=0s96=0s51=5DTW\T CONNECT\s9600 I hope this will be useful to you. If anyone figures out how to use a T2500 talking MNP[45] over V.32 to the modems at OSU, please let me know!