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000204_news@newsmaster….columbia.edu _Wed Aug 20 13:18:24 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Poor perforfance with MOTOROLA SURFER 56K and KERMIT 95
Date: 20 Aug 1997 17:18:22 GMT
Organization: Columbia University
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In article <33fb1d58.35296892@news.comm2000.it>,
Roberto Perelli <rober@proxys.it> wrote:
: I'm evaluating this new modem from Motorola with KERMIT95 at client
: side and C-Kermit 6.192 but when trasfering big files I get a lot of
: CRC errors and only using small packets transfer ends.
:
: Does anyone knows a configuration of this modem that can give better
: results?
:
File transfer performance is discussed at length in your C-Kermit manual,
especially Chapter 12 (of the second edition). Long packets are faster than
short packets if you have a good connection.
But you don't. CRC errors are indicative of any number of things -- again
all this is explained in your manual. Lack of effective flow control,
failure of the two modems to negotiate an error-corrected session, interrupt
conflicts, an unbuffered UART, you name it.
Meanwhile, as I'm sure you noticed, your modem is not directly supported by
Kermit 95. So I assume you are using K95 1.1.13 and its TAPI interface to
the modem. But who knows if the TAPI modem command strings are correct?
We have had several questions about BitSurfer modems, but we don't have any
information on them. If somebody would like to send us a copy of the
technical manual or command summary, then we could support them better.
- Frank
P.S. We do have a USR 56K (X2) modem, and it works very nicely with K95.