Sharpe, Sam J wrote:
I am facing a problem that I need to transfer some files (server to
client) over a one-way only communications channel (satellite download
only connection). Does anyone know of any ready made application (or
script) to help with that ? I guess the server would need to generate
and push forward error correction FEC data along with the files (since
there's no NACKs).
Any previous experience or thoughts is highly appreciated
I don't have any previous experience, but my thoughts are:
This is exactly what Satellite TV transmission does (one way data with
error correction). I believe it's possible to encapsulate data within
the DVB standard, but it involves wrapping the data within MPEG frames.
I would guess that the efficiencies of this are pretty bad, but it's
probably possible.
I have no idea how you'd go about researching this though!
For that matter, now you point it out, any TV or radio broadcast is a
one-way transmission of data.
Not a reliable one (like TCP) though.
UDP is fine if you can tolerate losses (as syslog does). I guess
splitting into small packets, wrapping with serial numbers and robust
ECC stuff and sending the whole set several times, uncollated, should
do. Experience would inform how many times are needed.
Whether to use UDP or raw IP may be a matter of taste (and whether UDP
headers are useful).
--
Cheers
John
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