Re: [hylafax-users] Troubleshooting failure to train modems

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

David Brodbeck wrote:

> I'm getting a lot of incoming fax failures due to failure to train modems.
> What's odd is faxes from the same machine will sometimes work, sometimes
> not.  I'm wondering if there are any settings I can tweak to improve the
> situation.  A log of one of the failures is attached below.  I'm wondering
> if I should increase Class1TCFMaxNonZero, since that seems to be the error
> that's being flagged.
>  


> Mar 02 12:43:59.12: [ 7629]: <-- [9:AT+FRH=3\r]
> Mar 02 12:43:59.72: [ 7629]: --> [7:CONNECT]
> Mar 02 12:44:00.97: [ 7629]: --> HDLC<9:FF C8 C1 00 60 1F 22 0D DD>
> Mar 02 12:44:00.97: [ 7629]: --> [2:OK]
> Mar 02 12:44:00.97: [ 7629]: REMOTE wants 9600 bit/s
> Mar 02 12:44:00.97: [ 7629]: REMOTE wants A4 page width (215 mm)
> Mar 02 12:44:00.97: [ 7629]: REMOTE wants unlimited page length
> Mar 02 12:44:00.97: [ 7629]: REMOTE wants 3.85 line/mm
> Mar 02 12:44:00.97: [ 7629]: REMOTE wants 2-D MMR
> Mar 02 12:44:00.97: [ 7629]: REMOTE wants T.30 Annex A, 256-byte ECM
> Mar 02 12:44:00.97: [ 7629]: <-- [9:AT+FRH=3\r]
> Mar 02 12:44:00.98: [ 7629]: --> [7:CONNECT]
> Mar 02 12:44:01.00: [ 7629]: --> [2:]
> Mar 02 12:44:01.01: [ 7629]: --> [10:NO CARRIER]
> Mar 02 12:44:01.01: [ 7629]: RECV training at v.29 9600 bit/s
> Mar 02 12:44:01.01: [ 7629]: <-- [10:AT+FRM=96\r]
> Mar 02 12:44:01.33: [ 7629]: --> [7:CONNECT]
> Mar 02 12:44:09.67: [ 7629]: MODEM TIMEOUT: receiving TCF
> Mar 02 12:44:09.67: [ 7629]: <-- data [1]
> Mar 02 12:44:09.68: [ 7629]: --> [16:.¬ç¨pi'"è'ÀÄø]
> Mar 02 12:44:09.68: [ 7629]: DELAY 75 ms
> Mar 02 12:44:09.76: [ 7629]: <-- [9:AT+FTH=3\r]
> Mar 02 12:44:09.76: [ 7629]: --> [2:OK]
> Mar 02 12:44:09.76: [ 7629]: TRAINING failed
>  

Notice that garbage before "DELAY 75 ms" ?   Your modem undoubtedly 
reset itself.  You'll need to get with the modem manufacturer to fix that.

However, it may be a consequence of using Class1TCFRecvHack.  So you may 
want to try disabling that.  The "Hack" config options are really for 
troubleshooting purposes.  Sometimes I guess that they could prove 
beneficial for production-use in some circumstances, but generally I'd 
not expect them to be in production-use.

Lee.

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