Re: Partial page print

Hi Lee

Thanks for the feedback.  A colleague proposed I maybe try downing the DTE-DCE speed (previously set at 115200, now at 57k).  For now I have not seen the issue yet.  If it pops up, I will try and change from 1.0 to 1.  I'm not using a VM but using an embedded environment.

Does seem like a serial comms issue though.

Kind regards
Christo

-----Original Message-----
From: Lee Howard [mailto:[email protected]]
Sent: 09 December 2015 12:00 AM
To: Christo Labuschagne
Cc: [email protected]
Subject: Re: [hylafax-users] Partial page print

Switch to Class 1 (from Class 1.0) and see what happens.

V.34-Fax unfortunately burdens the DCE (the modem firmware) with the generation of FCS bytes on the ECM frames. Consequently, the error correction occurs between the DCE and the remote end rather than from the DTE (the software, HylaFAX in this case). So, in a V.34-Fax situation the serial communication path between the DTE and DCE is not checked for errors.

Switching to Class 1 (disabling V.34-Fax) will make ECM check the entire data path, including the serial path between the DTE and DCE.

Normally the serial path between the DTE and the DCE is not suspect because... well, it's a rare thing. However, if the flow-control is broken (software or hardware - XON/XOFF or RTS/CTS) or if the serial
driver(s) are buggy, then there can be problems.

If I remember right, you are using a virtual machine, and if that is the case, then my first suspicion would be that there is a problem with the serial emulation in the VM. (We've certainly seen that be the case many times before.)

Thanks,

Lee.


On 12/07/2015 07:56 PM, Christo Labuschagne wrote:
>
> Good day all
>
> Second question of the week. We recently noticed that our device (with
> a Davicom modem running hylafax+ 5.5.6) sometimes only print partial
> pages to a Brother 2840 fax machine (have not confirmed if this
> happens to other fax machines as well). Please find attached the log
> files of two instances, one (nopp) where it printed a tiff without
> issues and the cxx6 where it printed the same tiff with pages 5-8 only
> half of the page, with pages 1-4 and 9 ? 10 without issues.
>
> It is a bit inconsistent in the sense that it does not always print
> 5-8 partial, sometimes only 9-10, so no pattern there yet. Am I
> missing something in the log file that would indicate a partial print?
> I?ve tried various combinations of ECM 256 and 64 with MR and MMR
> encoding without any luck. I also have the audio recording of the coms
> between the Davicom modem and the fax. Does anyone know of or have an
> application that can decode audio files to fax image?
>
> Thank you for the support!
>
> *Christo Labuschagne*
>
> *Developer***
>
>
> Important Notice:
>
> This e-mail and its contents are subject to the Nanoteq (Pty) Ltd
> e-mail legal notice available at:
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Important Notice:

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