jpp@specialix.co.uk (John Pettitt) (09/17/90)
Well ? has anybody done it ? I am told that I can get call setup times of the order of 200ms over ISDN. If this is true it should be possible to `fake' a connected all the time link using ISDN thus saving the cost of a leased line. This does sound rather too good to be true. Comments ? -- John Pettitt, Specialix International, Email: jpp@specialix.com Tel +44 (0) 9323 54254 Fax +44 (0) 9323 52781 Disclaimer: Me, say that ? Never, it's a forged posting !
pi@complx.UUCP (Kurt Jaeger) (09/18/90)
In article <1990Sep17.100257.9110@specialix.co.uk> jpp@specialix.co.uk (John Pettitt) writes: >Well ? has anybody done it ? I am told that I can get call setup >times of the order of 200ms over ISDN. Thats right. You can get something like a "leased ISDN" which requires You to pay (e.g. here in the FRG) at least 80 hours per month of connect time, but it will connect the line in a very short time. I think the 200ms depend on the distance to the goal. >If this is true it should be possible to `fake' a connected all the >time link using ISDN thus saving the cost of a leased line. Well, but it is NOT needed to use a fast-dial ISDN line. At the recent GUUG meeting Wiesbaden I have seen a normal ISDN setup with IP over ISDN. The line had a timeout of 20 seconds and automatically redialed when there were more packets. The timeout can be configured, they said... The dialing time was approx. three seconds, so IP wont recognize it anyway. I did a telnet to a host approx. 100km away and ftp'ed from there the kernel. The transmission rate was 5.2KB/sec (hashing enabled). The company offering the software (for 386er *IX, almost all important brands) can be reached at: BinTec Computersysteme Willstaetter Strasse 30 D-8500 Nuernberg 60 Tel. 0911-99675-0 Fax. 0911-6880725 I do not have any correlations with them, except hoping to reduce my News-feed-costs :) >This does sound rather too good to be true. Comments ? It sounds very interesting, yes. Well, that solution is useful for european ISDN-lines only, I assume :( So long, PI -- pi@complx.stgt.sub.org, K.Jaeger, D7K/FRG, +49 711 8701309 Q, 30 years to go !
08071TCP%MSU@PUCC.PRINCETON.EDU (Doug Nelson) (09/19/90)
>Well ? has anybody done it ? I am told that I can get call setup >times of the order of 200ms over ISDN. If this is true it should be >possible to `fake' a connected all the time link using ISDN thus >saving the cost of a leased line. > >This does sound rather too good to be true. Comments ? Yes, it has been done, at least with a PC as a router (based on KA9Q). We have done a demo of it right here on our campus. The ISDN packet driver used in this demo was developed at the University of Michigan. I don't know what its status is - it hasn't been contributed to the public packet driver collection. This one doesn't do anything about dropping the phone call when the line is idle and redialing when it's back, but that could be added, I'm sure. Doug Nelson Michigan State University
hagiwara@sm.sony.co.jp (Takashi Hagiwara) (09/19/90)
In article <9009182032.AA05594@ucbvax.Berkeley.EDU>, 08071TCP%MSU@PUCC.PRINCETON.EDU (Doug Nelson) writes: > >Well ? has anybody done it ? I am told that I can get call setup > >times of the order of 200ms over ISDN. If this is true it should be > >possible to `fake' a connected all the time link using ISDN thus > >saving the cost of a leased line. > > > >This does sound rather too good to be true. Comments ? Yes, it has been done. We, sony, has a unix-based workstation, it has the ISDN Interface board. (We got an apploval of PTT of Japan.) Our machine installed this board can be used as a TCP/IP gateway between Lan and ISDN. We will demonstorate TCP/IP over ISDN at InterOP '90. If anyone is interested in it, please stop by at Sony booth. Takashi Hagiwara (Hagiwara@Sm.Sony.Co.Jp)
dap@aber-cs.UUCP (Dave Price) (09/19/90)
I was interested to hear of the PD written at Michigan. I am currently writing one for a MITEL EXPRESS Card. Can anyone tell me more about the Michigan work? Dave Price
ms@unido.UUCP (Marc Sheldon) (09/21/90)
pi@complx.UUCP (Kurt Jaeger) writes: >>This does sound rather too good to be true. Comments ? >It sounds very interesting, yes. Well, that solution is useful for >european ISDN-lines only, I assume :( It should also work for American ISDN. The supported ISDN-hardware is capable of the American national ISDN-Standard. The only problem you will get is to find another person using the proprietary IP-over-ISDN- implementation of BinTec. But, better still, i hear that they are working on a PPP-implementation ... Coming real soon now ... We are going to offer Network-connections to UNIDO using this implementation of IP-over-ISDN in approx. 3 weeks. Marc Marc R. Sheldon e-mail : ms@Uni-Dortmund.DE University of Dortmund, CS-Department P.O.Box 500500 voice : +49 231 7552444 D-4600 Dortmund 50, West Germany FAX : +49 231 7552386
mts@TERMINATOR.CC.UMICH.EDU (Michael T. Stolarchuk) (09/21/90)
I'm suprised dory leifer hasn't said anything... Maybe he doesn't read tcp-ip. He has been working on tcp-ip over ISDN for over a year. He demoed his work at the last year educom at UofMichigan. I'm cc-ing him on this message in the hope that it will prompt him to send mail to tcp-ip. mts. the snail.
ole@CSLI.STANFORD.EDU (Ole J. Jacobsen) (09/22/90)
The Michigan ISDN work is described in the October (INTEROP) issue of ConneXions, page 27. The article is by Dory Leifer of Umich who will also be showing the ISDN implementation on the INTEROP 90 show floor. PS. The first sentence of the article has a typo which was introduced by the editor (me). It refers to ISDN as Integrated Services DATA Network instead of Digital Network. Oops, sorry, I need more AI than a spell- checker. :-) Ole J Jacobsen, Editor & Publisher ConneXions--The Interoperability Report Interop, Inc., 480 San Antonio Road, Suite 100 Mountain View, CA 94040, USA Phone: (415) 941-3399 FAX: (415) 949-1779 Email: ole@csli.stanford.edu
del@RUNNINGMAN.CC.UMICH.EDU (Dory Leifer) (09/22/90)
I'm suprised dory leifer hasn't said anything... Maybe he doesn't read tcp-ip. He has been working on tcp-ip over ISDN for over a year. He demoed his work at the last year educom at UofMichigan. I'm cc-ing him on this message in the hope that it will prompt him to send mail to tcp-ip. mts. the snail. -------- Thanks Mike. I usually do not read tcp-ip because of the large volume of traffic on it. People usually do forward me items that seem relevant to what I am working on. There is a separate mailing group that is dedicated to IP over ISDN. I would suggest that interested parties move their discussion to this group. The group can be addressed at: TCP-ISDN@list.prime.com or TCP-ISDN-REQUEST@list.prim.com to be added. In any case, I will be doing a demo of IP over ISDN at InterOp next month as well as a talk on what has been done here. Also there is a fairly involved article for this month's issue of Connexions. Dory Leifer Information Technology Division The University of Michigan +1 313 763 4896