home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
kermit.columbia.edu
/
kermit.columbia.edu.tar
/
kermit.columbia.edu
/
newsgroups
/
misc.19950528-19950726
/
000407_news@columbia.edu_Sat Jul 22 13:13:49 1995.msg
< prev
next >
Wrap
Internet Message Format
|
1995-07-31
|
6KB
Received: from apakabar.cc.columbia.edu by watsun.cc.columbia.edu with SMTP id AA02668
(5.65c+CU/IDA-1.4.4/HLK for <kermit.misc@watsun.cc.columbia.edu>); Sat, 22 Jul 1995 11:11:39 -0400
Received: by apakabar.cc.columbia.edu id AA16246
(5.65c+CU/IDA-1.4.4/HLK for kermit.misc@watsun); Sat, 22 Jul 1995 11:11:37 -0400
Newsgroups: comp.protocols.kermit.misc
Path: news.columbia.edu!news.cs.columbia.edu!news.boxhill.com!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in1.uu.net!omen!caf
From: caf@omen.com (Chuck Forsberg WA7KGX)
Subject: Re: Kermit download from CompuServe.. best setup??
Organization: Omen Technology INC
Date: Sat, 22 Jul 1995 13:13:49 GMT
Message-Id: <DC4Cr1.BB8@omen.com>
References: <3uidtu$r5c@hpber004.swiss.hp.com> <DC095G.Dp3@omen.com> <3ulp8c$ep5@apakabar.cc.columbia.edu>
Lines: 93
Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <3ulp8c$ep5@apakabar.cc.columbia.edu>,
Frank da Cruz <fdc@watsun.cc.columbia.edu> wrote:
>In article <DC095G.Dp3@omen.com>, Chuck Forsberg WA7KGX <caf@omen.com> wrote:
>: In article <3uidtu$r5c@hpber004.swiss.hp.com>,
>: Daniel Huber <danielh@hpber002.swiss.hp.com> wrote:
>: >Running Kermit 190, I'd like to download software from CompuServe over
>: >their Internet access. However, the filetransfer stops with synchronization
>: >errors and others...
>: >
>: >Anybody could provide me a .kermrc with a tuned setup for these downloads?
>:
>: You should be able to do better. These are results I got downloading
>: compressed files with SCO Unix Professional-YAM over the Internet using
>: a 14.4 PPP connection.
>:
>: K DIGI0032.JPG 414227 672 615.94 0 0 0 2043 -1 T cis
>: K DIGI0031.JPG 188152 681 275.95 0 0 0 2043 -1 T cis
>: R digi0029.jpg 161999 1484 109.14 0 0 0 128 2 rb cis
>: E digi0028.jpg 24576 962 25.53 0 10 0 1024 -1 rb cis
>: C digi0028.jpg 182266 1447 125.93 0 0 0 128 1 B cis
>: K DIGI0027.JPG 140818 612 229.81 0 0 0 2043 -1 rb cis
>: C digi0025.jpg 111577 1471 75.80 0 0 0 128 17 B cis
>: K DIGI0023.JPG 129055 709 181.82 0 0 0 2043 -1 rb cis
>: C digi0022.jpg 110808 1454 76.18 0 0 0 128 0 B cis
>: K DIGI0017.JPG 598644 647 924.06 0 0 0 2043 -1 rb cis
>: K WZCOMM.ZIP 177603 1453 122.18 0 0 0 4085 -1 T psu
>:
>What do the columns of numbers represent?
For wzcomm.zip (beta test of a native 32 bit WIN32 version of ZCOMM
shareware comms program for Win95 or NT):
177603 bytes transferred in file
1453 characters per second average throughput for file
122.18 seconds transfer time for file
4085 data bytes in last or largest packet
>
>: K = Kermit
>: R = ymodem-g
>: C = CompuServe 32 bit B+
>:
>: YMODEM-g is the fastest on CompuServe, but it won't be reliable
>: over internet until CompuServe gets the flow control right.
>:
>: ZMODEM is not generally available on CompuServe, so the B+ must be used.
>:
>: The Kermit timings do not include the annoying pause at startup,
>: so the real Kermit time is a bit worse than shown. These
>: figures indicate CompuServe's Kermit is not very spiffy. This
>: is the situation on most services. Unlike ZMODEM, freely usable
>: Kermit code is not very efficient.
>:
>Amen. CompuServe could very easily have installed fully capable Kermit
>protocol, but it chose not to do so. Readers may draw their own conclusions
>as to the reason, bearing their connect-time charges in mind.
Developers such as Datastorm and CompuServe tend to make use of
royalty-free code when implementing protocols. The most recent
royalty-free Kermit code released with the blessing of Columbia University
is "The Source" SuperKermit code published in the middle 1980s. As Frank
himself has commented, this version of Kermit was not robust. Its
poor performance prompted GTE Telenet to commission the creation
of ZMODEM in 1985/1986. The rest is history.
CompuServe claim they have not widely deployed ZMODEM because it
consumes too many resources. I suspect CompuServe have made the
same measurements of system resources consumed by sz and Ckermit
and concluded that Ckermit is far more resource intensive than sz.
>I would encourage paying CompuServe users to complain to CompuServe about
>the lack of a decent Kermit (and for that matter, Zmodem) file transfer
>capability, and to contact us at Columbia (and the management at Omen) if
>they want to put things right. They are, after all, not exactly
>cash-starved.
CompuServe has enhanced their B protocol with 32 bit CRC and streaming
data transfer to provide excellent throughput downloading the types of
files users download from CompuServe. A number of programs have competent
B+ implementations, including Omen Technology's ZCOMM and Professional-YAM.
The only programs I know of that have high performance Kermit
implementations are Omen Technology's ZCOMM and Professional-YAM, and
Columbia University's product. Since ZCOMM and Pro-YAM have good 32 bit
B+ download performance, only Columbia's product would benefit if
CompuServe switch to the current Kermit protocol. CompuServe may not wish
to make this change, which would increase system load and break some
programs written to the 1985 Kermit spec.
--
Chuck Forsberg WA7KGX caf@omen.COM 503-621-3406 FAX:-3735
Omen Technology Inc "The High Reliability Software"
Author of YMODEM, ZMODEM, Professional-YAM, ZCOMM, GSZ and DSZ
TeleGodzilla BBS: 503-621-3746 FTP: ftp.cs.pdx.edu pub/zmodem