Re: [hylafax-users] 4.2.1 Job Batching with MultiTech MT2834ZDX Modems

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

On 2005.01.26 07:35 Michael Boers wrote:
> After recently upgrading to hylafax 4.2.1 I began receiving notices 
> of  squished faxes.  It turns out when jobs are batched and sent with 
> my  MultiTech MT2834ZDX modem the following happens:
>
> 	1.	The first job is sent normally
> 	2.	The rest of the jobs are sent in fine (7.7 line/mm) mode
> 	3.	Because the fax is imaged in normal (3.85 line/mm) 
> mode, it only  uses half of the page vertically hence is squished
>
> Questions:
> 	1.	Is there a way to disable job batching globally rather 
> than on a  per destination basis?
> 	2.	Is there a fix for this?
>
> Partial Log File Follows, notice how the FDCS parameters from the  
> receiving machine at time 09:38:48.53 and 09:39:17.66 are different.

In Class 2 HylaFAX indicates to the modem what DCS parameters it wants 
the modem to use by way of the +DIS command.  HylaFAX traditionally 
only sends +DIS before the first page is sent and thereafter before any 
page where the session parameters need to change.  If the session 
parameters don't need to change, then it doesn't send +DIS.

> Jan 26 09:38:41.21: [67876]: USE 3.85 line/mm
> Jan 26 09:38:41.21: [67876]: USE 2-D MR
> Jan 26 09:38:41.21: [67876]: <-- [24:AT+FDIS=0,5,0,2,1,0,0,2\r]
> Jan 26 09:38:41.48: [67876]: --> [2:OK]
> Jan 26 09:38:41.48: [67876]: <-- [7:AT+FDT\r]
> Jan 26 09:38:48.53: [67876]: --> [21:+FDCS:0,5,0,2,1,0,0,3]
> Jan 26 09:38:48.53: [67876]: --> [7:CONNECT]

> Jan 26 09:39:05.29: [67876]: SEND send EOM (more documents)

> Jan 26 09:39:10.85: [67876]: USE 3.85 line/mm
> Jan 26 09:39:10.85: [67876]: USE 2-D MR
> Jan 26 09:39:10.85: [67876]: <-- [7:AT+FDT\r]
> Jan 26 09:39:17.66: [67876]: --> [21:+FDCS:1,5,0,2,1,0,0,1]
> Jan 26 09:39:17.66: [67876]: --> [7:CONNECT]

Notice that the modem seems to have "forgotten" our previous +DIS 
command.  Looks like we need to send +DIS after every instance of EOM, 
too, then.  Please try the attached patch and let me know how it goes.

I think that this is really a bug with the modem.  My thinking is that 
the modem should remember the +DIS command.  However, we can easily 
work around the error by reminding the modem.  Furthermore, I think 
that the MT2834ZDX is end-of-life, and so you won't see any fix-it 
support from the manufacturer.

Lee.

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