Re: [hylafax-users] Hylafax comportation with high latency... and bad modems :-(

[Diego Ercolani <Diego.Ercolani@xxxxxxxxx>]

Alle 19:35, giovedì 16 settembre 2004, caro Lee Howard hai scritto:

> > fiberglass and VOIP.
> > Could it be a problem of high latency?
>
> In this case, no, it doesn't look like latency.
>
> > I've tryied with a standard fax machine (hp multifunction printer) and
> > all
> > work well......
>
> Your HylaFAX version is 4.1.8 and you're running in Class 2 (I think,
> whatever AT#CLS=2 does on your modem).  So comparing it against an HP
> multifunction device really isn't a fair comparison.  The HP likely has
> a better fax implementation than does your modem's Class 2 firmware.
> Also, the the HP likely supports ECM (error correction), which is going
> to make it "look" like there are no problems due to the end result.
>
> When faxing over VoIP you should certainly make sure to use ECM
> whenever possible.  In order to do this, upgrade to 4.2.0 and switch to
> Class 1.
>
> > How can hylafax help me?
> > For convenience I've included a sample log. Note that at about
> > 17:49:38 modem
> > stop writing data:
> > Sep 16 17:49:38.89: [ 4976]: <-- data [1026]
> > and then hylafax resumes with error:
> > Sep 16 17:50:58.88: [ 4976]: MODEM TIMEOUT: writing to modem
> > Sep 16 17:50:58.88: [ 4976]: MODEM WRITE SHORT: sent 1026, wrote 817
> > Sep 16 17:50:58.88: [ 4976]: SENT 22472 bytes of data
> > Sep 16 17:50:58.88: [ 4976]: SEND abort data transfer
>
> This error indicates that the modem hardware or the modem driver was a
> problem in this case: it stopped accepting data from HylaFAX.
>
> Lee.
>
You were right.
It seems that with 4.2.0 almost hylafax try the ECM  (with class 1). But the 
quantum leap is to use XonXoff for the ModemFlowControl  (almost for my 
modems 3com external sporster (1998) and external conexant (2001) ).

Thank you again for your support
Diego

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