Path: utzoo!censor!geac!yunexus!rreiner
From: rreiner@yunexus.YorkU.CA (Richard Reiner)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: Fastest Modem Transfer Protocal - Opinions Needed
Message-ID: <12085@yunexus.YorkU.CA>
Date: 26 Jun 90 06:24:55 GMT
References: <1990Jun23.203333.12501@ariel.unm.edu> <1990Jun26.021616.11782@murdoch.acc.Virginia.EDU>
Organization: York U. Computing Services
Lines: 16

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.