jwabik@uc.msc.umn.edu (Jeff Wabik) (02/28/90)
Recently, we've been having trouble doing long-distance with our Microcomm V.32 modems with MNP class 9.. MNP is rarely able to negotiate a high-speed connection, and then keep it up for more than 5 minutes. We solved our problems with T2500's running PEP.. The Telebit modems seem to have no difficulty making the same connection. Everything I've ever seen shows me that PEP is a much better protocol for cruddy lines, while MNP is better for speed. Can someone more "in the know" (e.g. Understands each protocol well enough to point out the pros and cons) than I make a "Consumer Reports" style comparison of the two protocols? (Or even MNP at class 5 on V.32) Thanks! -Jeff -- Jeff A. Wabik E/Mail: jwabik@msc.umn.edu Minnesota Supercomputer Center AT&T: +1 612 626 0211 Minneapolis, MN FAX: +1 612 624 6550
ed@braaten.doit.sub.org (Ed Braaten) (03/17/90)
In article <897@lectroid.sw.stratus.com> dts@pwllheli.sw.stratus.com (Daniel Senie) writes: >> I can >> pretty much assume that I can drop any two TrailBlazers anywhere in the >> world, and they will connect, and stay connected, and give me acceptable >> throughput. With V.32, it seems like I'm lucky to get through, and lucky >> beyond my wildest dreams if I can hold the connection for an hour. >> >> <csg> > >To or from France, PEP does not work, and V.32 with MNP4 will stay up >for hours at a time. I don't think Telebit is certified for France (they >can correct me if I'm wrong). What do you mean by "PEP does not work". Is it because the French PTT doesn't authorize the use of PEP modems in France, or did you actually find that using a PEP modem in the USA to connect to a PEP modem in France didn't work? Re: certification. Let's hope that Europe 1992 forces the PTT's across Europe to make some changes. Example: The German PTT (Telekom) recently introduced a modem that is basically a Telebit Trailblazer with some ROM changes. The price to buy this modem which has the Telekom's "certification" is over 6000 DM. You can buy the same modem (sans ROM/power supply changes) in an "export-only" version for 2-3000 DM. Comments from Telebit? Was more changed than just the ROMS - is it worth the difference in price? -------------------------------------------------------------------------- Ed Braaten | "For the wages of sin is death, but the Work: ed@imuse.intel.com | gift of God is eternal life in Christ Home: ed@braaten.doit.sub.org | Jesus our Lord." Romans 6:23 --------------------------------------------------------------------------
urlichs@smurf.sub.org (Matthias Urlichs) (03/20/90)
In comp.dcom.modems, article <627@braaten.doit.sub.org>,
ed@braaten.doit.sub.org (Ed Braaten) writes:
<
< Re: certification. Let's hope that Europe 1992 forces the PTTs
< across Europe to make some changes. Example: The German PTT
< (Telekom) recently introduced a modem that is basically a Telebit
< Trailblazer with some ROM changes. The price to buy this modem
< which has the Telekom's "certification" is over 6000 DM. You
< can buy the same modem (sans ROM/power supply changes) in an
< "export-only" version for 2-3000 DM.
<
6000 DM, btw, are about $3500. You can get two or three T2500s for
that.
They didn't only change the ROMs, but also hacked the hardware, which might
contribute to the problem described below.
< Comments from Telebit? Was more changed than just the ROMS -
< is it worth the difference in price?
<
You forgot the :-) and the :-( here. (Lots of :-(s, to be exact.)
If you have the German "Kabelmetall" version (which does not even have V.32;
Kabelmetall is the company who did the adaption to the Telekom idea of what
international standards are supposed to be like), you can _not_ dial into a
T2500 in PEP mode.
Don't ask me why. It just won't work. All other combinations are OK (ie, you
can dial up a T1000 from the Kabelmetall modem, or you can dial into the
Kabelmetall modem from a T2500, in PEP mode).
<
They also introduced some stupid limitations on register settings.
For instance, S10 (carrier loss to disconnect time) is either 250 msec or ten
seconds. No other setting of that register will be accepted. :-( :-( :-(
The German translation of the manual of course adheres to the German idea
of how to name wires and handshakes and stuff, and thus manages to be
virtually unreadable.
I'd advise anyone who wants a PEP modem to buy a T2500.
The University of Karlsruhe has one also; we asked the Telekom "network
coordinator" if he had any problems with the modem not being "certified".
He said no, so the modem stayed. Works flawlessly, too.
--
Matthias Urlichsclear@actrix.co.nz (Charlie Lear) (03/21/90)
In article <627@brt.sub.org> ed@braaten.doit.sub.org (Ed Braaten) writes: >which has the Telekom's "certification" is over 6000 DM. You >can buy the same modem (sans ROM/power supply changes) in an >"export-only" version for 2-3000 DM. I have a similar beef. Netcomm Australia has the agency for Telebits in Australia and New Zealand. The price for a T2000 (NOT 2500!) with a Netcomm badge on it is NZD$6406 - that's USD$3811.57 for an eighteen-month-old modem. Is it any wonder that *NOBODY* outside big corporations in New Zealand use Trailblazers? If someone at Telebit reads this newsgroup (I'm sure they do) perhaps they would care to comment on this topic. I'm dead keen on buying a T2500 for my newsfeed/BBS, after all I can get one for less than a quarter of the price of a locally-supplied T2000 if I buy direct from the States. The trouble is, if I *DO* get one, virtually nobody will be able to connect to me using PEP, since there's very few TB's in New Zealand... -- Charlie "The Bear" Lear: Call The Cave BBS, 64(4)643429 157MB Online! Home of the World Famous KiwiBoard BBS Software! Snail: P.O. Box 12-175, Thorndon, Wellington, New Zealand All mail and flames to clear@actrix.co.nz
dts@pwllheli.sw.stratus.com (Daniel Senie) (03/23/90)
In article <627@braaten.doit.sub.org>, ed@braaten.doit.sub.org (Ed Braaten) writes: > > >To or from France, PEP does not work, and V.32 with MNP4 will stay up > > What do you mean by "PEP does not work". Is it because the French PTT > doesn't authorize the use of PEP modems in France, or did you actually > find that using a PEP modem in the USA to connect to a PEP modem in > France didn't work? We have tried numerous times. The telebits keep negotiating the number of carriers and number of bits per carrier in PEP mode until none are left. Several attempts have been made with calls originating both in France and U.S.A. with no luck. We felt very lucky to have purchased V.32 since it does survive the transatlantic lines... I'm not sure what it is about the French PTT, but something about it does actually cause PEP to give up. Any comments from Telebit would be interesting... Daniel Senie UUCP: uunet!lectroid!dts Stratus Computer, Inc. ARPA: dts@lectroid.sw.stratus.com 55 Fairbanks Blvd. CSRV: 74176,1347 Marlboro, MA 01752 TEL.: 508 - 460 - 2686