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000329_fdc@columbia.edu_Tue Jan 29 11:19:35 EST 2002.msg
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Article: 13167 of comp.protocols.kermit.misc
Path: newsmaster.cc.columbia.edu!news.columbia.edu!news-not-for-mail
From: fdc@columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Evaluation of K95
Date: 29 Jan 2002 08:25:08 -0500
Organization: Columbia University
Lines: 35
Message-ID: <a367rk$m5s$1@watsol.cc.columbia.edu>
References: <c4914b87.0201280513.16dbc7a5@posting.google.com> <gWtomC2dEjRt-pn2-s9d6MMWmKCzf@era0>
NNTP-Posting-Host: watsol.cc.columbia.edu
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Xref: newsmaster.cc.columbia.edu comp.protocols.kermit.misc:13167
In article <gWtomC2dEjRt-pn2-s9d6MMWmKCzf@era0>,
ERA <era@eracc.hypermart.net> wrote:
: On Mon, 28 Jan 2002 13:13:54 UTC, satprof@altavista.com
: (satprof) wrote:
:
Thanks for the ringing endorsement, Gene.
: + My requirement is for a solid & reliable overnight transfer of
: ^^^^^ ^ ^^^^^^^^
: You're talking kermit products from Columbia U. there definitely.
:
: + about 70MB via double satellite links (~ 300kbps)...
:
70MB / 30Kcps = 39 minutes...
: ...with the
: + possibility of data validation & restarts. Has anyone here any
: + experience with such a set-up?
:
: Not with satellite links.
:
Of course Kermit works nicely with satellite links too, because of its
sliding windows with selective repeat transport, but some first-hand
independent testimony would be appreciated. Meanwhile, however, you might
want to look at the following article from 1990:
http://www.columbia.edu/kermit/newsn4.html#eff
Towards the end are some benchmarks performed over a satellite link.
Speeds are higher these days but the issues are the same. Kermit sliding
windows let you get pretty much full speed out of satellite links, whereas
stop-and-wait or streaming protocols are either orders of magnitude slower,
or else have intolerable error recovery characteristics.
- Frank