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

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

(I accidentally hit "send" prematurely last time.)

On 2005.01.26 07:35 Michael Boers wrote:

> Questions:
> 	1.	Is there a way to disable job batching globally rather 
> than on a  per destination basis?

I had intended on adding a modem "SupportsBatching" config option, but 
it looks like I didn't do it.  If someone opens a Bugzilla report on 
it, or adds a note to the existing batching bug report, then I will 
eventually get around to it.  However, I'd much prefer fixing any 
batching errors first.

> 	2.	Is there a fix for this?

I think that the attached patch will fix it for you.

> 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 really stems from 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.

Attachment: hylafax-eomdiscmdfix.patch
Description: Binary data