Help. Newbie. sendfax looses scanlines at Tx.

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Hello. This is my 1st post in this newsgrp.

I've just been looking around in this group for a similar probblme but I
did not identinfy with any, so I need to post in order to get help.

Today I installes mgetty + sendfax on a Redhat 6. I installed the rpm
which came with RH6. I tried to send some textfiles over a fax
connection and I managed to get the result of a "ls /", parsing it trhu
pbmtext and thru pbm2g3. Then I sent the file an all was OK. That g3
file was less than 10k long.

Then I realised that the letters received were quite little, and I treid
to scale the pbm, and I used another input which was a hand-generated
file similar to a price-list in order to figure out a major approach to
the final result that I need.

I got the fax nearly correct, but some scan lines were missing. I did a
lot of trial-and-error combinations and I realised that the problem is
on the sendfax or on my modem. I know that the g3 file is ok, because if
the g3 file which looses lines is converted back to another format,
there are no missing lines. The fax-machine receiving the faxes is a
dayly used machine at my job and did not fail in some years of
functioning. So the froblem is between the g3 and the reception, which
means the sendafax and modem.

I realised that all little files are sent correctly. Little is less then
10k approx. Greater files are NOT truncated in the transmission, it
looses a group of scanlines and then continues. The log file says tha
ALL is ok. No Error was logged. Neither the PC nor the fax-receiver
complains about it.

Anybody got the same problem?

I use an Sporster Flash US Robotics.

Thank you very much.