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000059_news@columbia.edu_Tue Aug 1 12:29:13 1995.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: One-Way File Transfer Protocol?
Date: 1 Aug 1995 12:29:13 GMT
Organization: Columbia University
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References: <3vjs4e$nip@elaine30.Stanford.EDU>
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In article <3vjs4e$nip@elaine30.Stanford.EDU>,
Dylan Mackay <opel@leland.Stanford.EDU> wrote:
: I am looking for information on one-way file transfer protocols. What
: I mean by this is a protocol that will support file transmissions in
: which the receiving side has no transmission capability at all. It
: cannot send flow control, error-checcking responses, or anything else
: it might do in traditional ftp-style protocols. Ideally, some type of
: error-checking information could be send with the file, so that the
: receiving end could interpret what it has received, and establish
: whether the transmission was corrupted or not.
:
: I imagine that one could simply add up all of the bytes transmitted,
: and then transmit that sum as a checksum byte. Unfortunately, this
: would only allow the receiver to discard erroneous files, not correct
: them in any way. If there is a more sophisticated type of one-way
: transmission, I'd like to hear about it.
:
: Does such a protocol exist? Is there some kind of a standard? Where
: can I find out about it?
:
It's called "forward error correction". The problem has been considered
in some depth by scientists in the space program:
(a) Obtain an advanced degree in mathematics.
(b) Learn about Hamming codes.
(c) Learn about Bose-Chaudhouri-Hocquengham codes.
(d) Find papers on the fifty or so more advanced techniques developed
since then.
Not for the faint of heart.
- Frank