Problem receiving ECM-Faxes with Zyxel U-1496E

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Hi,

Markus Hövekamp wrote:
> Since now I had only very few trouble using my two old Zyxel-modems to
> send and receive fax messages with mgetty (mgetty-fax_1.1.12-1 from
> debian). 
> 
> Only receiving faxes in ECM-mode doesn't work as it should: Using my
> Zyxel with ROM 6.14 always results in the following error (without a
> page been received):
> 
> 	The fax receive was *not* fully successful
> 	The Modem returned +FHNG: 73
>                    (T.30 T2 timeout, expected page not received)

Hmmm. Never tried ECM faxing, but I remember that there were some
complaints on the Hylafax mailing list.

> When my other Zyxel with ROM version 6.13 does the job, the fax is
> received completely but the bit order is just the other way round than
> normal. That makes it very hard to process the fax, since the new_fax
> script doesn't now when to use the -M option in fax2tiff and when not.

Are you using class 2 or class 2.0?  In class 2, the bit order is always
"wrong" (Rockwell compatibility), but mgetty knows about it, while in
class 2.0, the bit order should be "right" by default.  Maybe, if you use
class 2, the ZyXEL Rockwell bug-compatibility doesn't work in ECM mode,
and thus the bit order is "double-wrong"...

> Is it just that I have to update my Zyxel EPROMs? When yes, what is a
> stable version being able to receive ECM correctly? 

No idea, but they have up to 6.20 now, so please try and report back to us
:)

> Or is there another
> "trick" to avoid the problem (perhaps by deactivating ECM)?

That would be another possible approach.

> P.S.: For testing purposes I can recommend calling the (at least for
> D2-customers) free phone number 0172-1414. A voice system will answer
> the call and it is quite easy to order a fax which will be sent some
> seconds later to Your fax number.

Not free for me...

gert
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Gert Doering - Munich, Germany                             gert@greenie.muc.de
fax: +49-89-35655025                        gert.doering@physik.tu-muenchen.de