Re: flexfax: Error, please help

[David Woolley <david@djwhome.demon.co.uk>]

> First the necessary info:
> I' m using Hylafax Ver. 4.0pl2 under Linux 6.1 with compiler ver. gcc
                                       ^^^^^^^^^
No such thing.  This looks like a Red Hat version number; the most
recent Linux kernel version is 2.2.x (2.3.x as the development version).
(Red Hat was 6.0 in mid June, Caldera 2.2, SuSE 6.1, Debian 2.1r2 and
Slackware 4.0)

> 2.91.66 and Zyxel U1496EG+  with firmware 6.10
 ^^^^^^^^
I don't believe this either, althogh Red Hat have a habit of confusingly
renumbering well known version numbers.

Can you confirm that this really is 4.0pl2, i.e. you built it from the
unpatched, original, source code.

> If I interpret the protocol right, the tranfer is interrupted because my
> machine is missing the acknowledgment for the

No it's interrupted because the the remote machine considered that
the received signal quality was inadequate and the page needed to be
resent and the modem recalibrated (retrained).  The remote machine sent
retrain negative, where the retrain is the request for re-calibration
and the negative means that the page was not acceptable and needs to
be re-transmitted.

RTN's can be caused by a bug in the tagline processing for which there
is a patch (which should be in recent Red Hat binaries, but is not
in the baseline source code).  They can also be caused by real line
quality or hardware problems and by flow control problems.

> Aug 14 05:18:54.04: [32604]: REMOTE best rate 9600 bit/s
> Aug 14 05:18:54.04: [32604]: USE 9600 bit/s
> Aug 14 05:19:00.19: [32604]: --> [1:]
> Aug 14 05:19:00.19: [32604]: SEND begin page
> Aug 14 05:19:17.24: [32604]: SENT 26665 bytes of data
> Aug 14 05:19:17.24: [32604]: SEND end page
> Aug 14 05:19:26.97: [32604]: -->
> [54:]

This is the modem trying to impose software flow control on the computer.

> Aug 14 05:19:26.97: [32604]: --> [2:OK]

However the total time is consistent with flow control working, so it
may be using hardware flow control as well.

> Aug 14 05:19:26.97: [32604]: SEND send MPS (more pages, same document)
> Aug 14 05:19:26.97: [32604]: <-- [9:AT+FET=0\r]
> Aug 14 05:19:29.81: [32604]: --> [7:+FPTS:2]
> Aug 14 05:19:29.81: [32604]: --> [2:OK]
> Aug 14 05:19:29.81: [32604]: SEND recv RTN (retrain negative)