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



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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