sendfax, USR Faxmodem 56K, again

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Hi,

On Fri, Jul 02, 1999 at 03:08:46PM +0200, Norbert Preining wrote:
> On Thu, 01 Jul 1999, Gert Döring wrote:
> > Actually, sendfax depends on the "wellbehavedness" of the local modem.  
> > If the modem needs things like byte padding (where the class 2 standard
> > explicitely says "no padding is sent"), the modem is just broken, and I
> > didn't want to make everything slower (due to extraneous padding) just 
> > to cope with a few broken modems.
> 
> I am not so sure about the not-robustness of my local modem! I tried
> sending faxes to some other fax machines without any problem, and 
> in this way I say that is not really a problem of sendfax, but a problem
> of the stupid fax machines on the other end, that is my experience!

No, it is not.  The usual problem here is byte-padding - how much you
have to pad depends on the receiving machine, and if a modem doesn't
get it right, it will fail for *some* receivers and not for other.s.

> But: It may be a good idea to incorporate some clean-up code in sendfax
> so that if you have to fax to such machines, you can definitely do it
> without problems. At the moment I use most of the time sendfax, but
> when I have to send faxes to two places with philips fax machines
> I have to use efax, because efax seems to clean up the g3-code. 

It doesn't *clean* the G3 code, it obfuscates it - inserting byte padding
is hardly what I would call "cleaning".

But as I said, I will have to add byte padding anyway (for class 1), and 
it will be possible to switch it on for class 2 mode if your modem doesn't
do it properly.

gert

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