Re: [hylafax-users] Forcing lower baud rate fax-fax

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

On 2003.11.21 22:14 John Murphy wrote:
> I have line quality problems that prevents consistent
> sending/receiving (even
> with a regular fax machine) unless I force the baud to 9600 or slower.
>  I'm
> having trouble doing this.  I think I need to limit the
> capabilities/arguments of the AT+FRM and AT+FTM= commands to values
> 96/97 or
> below.

This can be done with HylaFAX CVS HEAD (to someday be 4.2.0) with the 
Class1TMQueryCmd and Class1RMQueryCmd options.

> In my logs, I see lots of re-training at lower and lower baud rates
> until a
> page or two squeaks through.

HylaFAX CVS also has a "better" (at least for me and for a couple 
others that have shown logs to this effect) retraining and slow-down 
procedure which may help faxes go through without touching 
Class1TMQueryCmd or Class1RMQueryCmd.

> How can I limit the range of transfers
> without
> going in and messing with the class1.c++ file or some other nasty
> hack.

'man hylafax-config' details this in HylaFAX CVS.

HylaFAX CVS also supports Class 1 ECM (Class1ECMSupport which defaults 
to "no").  Enabling this feature may likely help get faxes through 
looking "perfect" (no bad scan lines) on noisy lines, even at faster 
baud rates (and a tighter compression, MMR).  It still may slow things 
down a bit (because it repeatedly resends portions of the image that 
didn't go through properly).

If you do use Class 1 ECM you may want to review:

http://bugs.hylafax.org/bugzilla/show_bug.cgi?id=451

which enables taglines on MMR faxes (and is undergoing QA before its 
committal to CVS).

Lee.

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