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From: weisen@eniac.seas.upenn.edu (Neil Weisenfeld)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: Fastest Modem Transfer Protocal - Opinions Needed
Message-ID: <26501@netnews.upenn.edu>
Date: 27 Jun 90 13:48:39 GMT
References: <1990Jun23.203333.12501@ariel.unm.edu> <1990Jun26.021616.11782@murdoch.acc.Virginia.EDU> <12085@yunexus.YorkU.CA>
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Reply-To: weisen@eniac.seas.upenn.edu.UUCP (Neil Weisenfeld)
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In article <12085@yunexus.YorkU.CA> rreiner@yunexus.YorkU.CA (Richard Reiner) writes:
>dmm0t@hudson.acc.Virginia.EDU (David M. Meyer) writes:
>
>>I've always found Zmodem to be the fastest.  Kermit, on the other
>>hand, is consistently the slowest protocol of any I've used.
>
>There's Kermit and then there's Kermit.  Old versions of Kermit are
>pretty slow: they use 90 byte packets, and handshake after each
>packet.  Newer Kermits can use packets up to 2000 bytes, and support
>sliding windows.  This means they can be as fast as Zmodem (and for
>the same reasons).
>
>There's also the issue of whether Kermit thinks it's on a 7 bit or an
>8 bit wide link.  Sending binaries on a 7 bit link forces Kermit to do
>"8th bit quoting" which on average increases transfer time by 50%.
>Other protocols, on the other hand, generally just can't transfer 8
>bit data on a 7 bit link.

Thanks goodness someone mentioned this.  There was some dispute about
this a while ago.  Some people said that Zmodem doesn't do 8th bit quoting
and some said that it does.  I even had some alum. from my school try to
tell me that I didn't need 8th bit quoting (even though the campus network
administrators agree that I do).  ... And someone else who told me
that our VAX 6300 was stupid (or broken) because IT required it.  I didn't
take the time to respond to that.

Anyway, If someone can truly answer whether or not Zmodem will do it,
and if a version exists for UNIX that will do it, it would be greatly
appreciated.

Neil


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Neil I.  Weisenfeld                    | InterNet: weisen@eniac.seas.upenn.edu
Dept. of Computer and Info. Sciences   | USPS: I dunno, I'm moving...
University of Pennsylvania             | PENNmail: Don't even try it...
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