flexfax: Squished pages when receiving

[Roeland de Ponti <Roeland@messina.demon.nl>]

I have been experiencing similar problems to those stated in FAQ 141,
only my problem is exactly the other way around. I have configured my
faxmodem for CLASS2 operation. I've used the

    Class2DDISCmd:          AT+FDIS

configuration parameter.

If I send a fax from Hylafax to a Brother fax machine, the faxes turns
out correct. However if I send a fax from the Brother fax machine to
Hylafax, the faxes negotiate 3,85 line/mm, resulting in the 'squished'
fax syndrome.

This is a part of the trace log while sending from the Brother fax to
HylaFax:
    ...
    Dec 15 15:40:16.02: [ 3121]: ANSWER: FAX CONNECTION
    Dec 15 15:40:16.03: [ 3121]: RECV FAX: begin
    Dec 15 15:40:21.73: [ 3121]: --> [5:+FCON]
    Dec 15 15:40:23.35: [ 3121]: --> [29:+FTSI: "         31206387595"]
    Dec 15 15:40:23.35: [ 3121]: REMOTE TSI "31206387595"
    Dec 15 15:40:23.65: [ 3121]: --> [22:+FDCS: 0,5,0,2,0,0,0,3]
    Dec 15 15:40:23.65: [ 3121]: REMOTE wants 14400 bit/s
    Dec 15 15:40:23.65: [ 3121]: REMOTE wants page width 1728 pixels in
215 mm
    Dec 15 15:40:23.65: [ 3121]: REMOTE wants unlimited page length
    Dec 15 15:40:23.65: [ 3121]: REMOTE wants 3.85 line/mm
    Dec 15 15:40:23.65: [ 3121]: REMOTE wants 1-D MR
    Dec 15 15:40:23.76: [ 3121]: --> [2:OK]
    Dec 15 15:40:23.76: [ 3121]: <-- [7:AT+FDR\r]
    Dec 15 15:40:26.68: [ 3121]: --> [5:+FCFR]
    ...
And this is part of the log obtained from sending from Hylafax to the
Brother Fax
    ...
    Dec 15 15:45:53.95: [ 3157]: DIAL **2
    Dec 15 15:45:53.95: [ 3157]: <-- [8:ATDT**2\r]
    Dec 15 15:46:09.17: [ 3157]: --> [5:+FCON]
    Dec 15 15:46:11.25: [ 3157]: --> [29:+FCSI: "         31206387595"]
    Dec 15 15:46:11.25: [ 3157]: REMOTE CSI "31206387595"
    Dec 15 15:46:11.67: [ 3157]: --> [22:+FDIS: 1,5,0,2,1,0,0,3]
    Dec 15 15:46:11.67: [ 3157]: --> [2:OK]
    Dec 15 15:46:11.67: [ 3157]: REMOTE best rate 14400 bit/s
    Dec 15 15:46:11.67: [ 3157]: REMOTE max page width 1728 pixels in
215 mm
    Dec 15 15:46:11.67: [ 3157]: REMOTE max unlimited page length
    Dec 15 15:46:11.67: [ 3157]: REMOTE best vres 7.7 line/mm
    Dec 15 15:46:11.67: [ 3157]: REMOTE best format 2-D MR
    ...
It's strange since the faxes use 2-D encoding/ 7.7line/mm when sending
from Hylafax to the Brother fax, but use 1-D encoding/3.85line/mm when
sending from the Brother fax to Hylafax.

This doesn't only occur with the Brother fax. Other fax machines have
the same problem when sending to the Hylafax server. I've tried this
configuration using 'Use2D' set to yes and no, both options show the
same result.

If, however, I configure the faxmodem for class1 use, this is what the
log files show when Hylafax receives from the Brother fax.

    Dec 15 15:57:32.39: [ 3272]: REMOTE wants 14400 bit/s
    Dec 15 15:57:32.39: [ 3272]: REMOTE wants page width 1728 pixels in
215 mm
    Dec 15 15:57:32.39: [ 3272]: REMOTE wants unlimited page length
    Dec 15 15:57:32.39: [ 3272]: REMOTE wants 3.85 line/mm
    Dec 15 15:57:32.39: [ 3272]: REMOTE wants 2-D MR
    Dec 15 15:57:32.39: [ 3272]: RECV training at v.17 14400 bit/s

Received and transmitted faxes using Class1 operation show no signs of
squished pages.
What's more, the info file for the capabilities of the faxnumber for the
Brother fax state that the remote fax supports 2D-encoding. However, the
2D encoding is only used when transmitting to the Brother fax and not
when receiving from the Brother fax.

The modem I'm using is a so-called 'Wisecom' modem. It's based on a
Rockwell chipset. I've been experiencing problems like these with
basically all modems I've been using since I started using Hylafax 3.0
(I'm currently using 4.0pl2). All of these modems are Rockwell based.

For now, I'll go back to class1 operation mode, however I would
appreciate if anyone can explain why this occurs.

Roeland