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From: chris@utgard.uucp (Chris Anderson)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: Trouble with Telix Kermit
Summary: hmmm
Keywords: nn
Message-ID: <1991Jan15.220602.26108@utgard.uucp>
Date: 15 Jan 91 22:06:02 GMT
References: <1991Jan13.211741.6620@murdoch.acc.Virginia.EDU> <1991Jan13.222953.24375@agate.berkeley.edu> <1991Jan14.003203.8193@murdoch.acc.Virginia.EDU>
Followup-To: comp.binaries.ibm.pc.d
Distribution: na
Organization: QMA, Inc., Rancho Cordova, California
Lines: 31

In article <1991Jan14.003203.8193@murdoch.acc.Virginia.EDU> dmm0t@holmes.acc.Virginia.EDU (Dave Meyer) writes:
>Kermit with sliding windows is nowhere near as fast as Ymodem or Zmodem,
>but for those of us using 7-bit networks, it's the only game in town.
>X/Y/Zmodem require 8-bit transmission.

Ummm, I beg to differ.  My experiments with sliding window kermit 
(and by that I mean the new one, not the old sliding window kermit
released several years ago) show it to be comparable with ymodem 
and about 85-90% of zmodem's efficiency.  In addition, kermit is
much more stable with noise on the line than zmodem.  This was 
with 2 512byte windows.  

Zmodem also can be used on 7 bit lines.  It does this the same way
that kermit does -- by escaping every 8 bit character.

>If you can get Zmodem to work for you, there's absolutely no reason
>to go to any other protocol unless you have an error correcting
>modem (in which case, use Ymodem-G).  But if you're stuck using kermit,
>get the sliding windows versions running on host and remote and you'll
>see a huge improvement.

I'm not such a big fan of zmodem when you have noisy lines.  Zmodem
makes some huge assumptions regarding the quality of the line.  Kermit
is slower, but it gets the job done where zmodem will crap out.

Chris
-- 
+---------------------------------------------------------------+
|  Chris Anderson, QMA, Inc.      utgard!chris@csusac.csus.edu  |
|      My employer doesn't listen to me... why should you?      |
+---------------------------------------------------------------+