Re: [hylafax-users] RECV FAX: Failure to train modems

[Lee Howard <faxguy@howardsilvan.com>]

On 2003.05.29 11:23 Jan Kuhn wrote:

> May 29 13:04:00.04: [  714]: RECV training at v.17 14400 bit/s
> May 29 13:04:00.04: [  714]: <-- [11:AT+FRM=145\r]
> May 29 13:04:01.74: [  714]: --> [7:CONNECT]
> May 29 13:04:03.45: [  714]: RECV: TCF 2722 bytes, 13% non-zero, 45
> zero-run
> May 29 13:04:03.45: [  714]: RECV: reject TCF (too many non-zero, max
> 10%)
> May 29 13:04:03.45: [  714]: RECV: reject TCF (zero run too short, min
> 1800)

TCF is supposed to be 1.5 +/- 10% seconds of zero data.  At 14400 bps 
that comes out to 2700 bytes.  So you seem to be receiving the right 
amount of data, but the longest run of zero that you're getting is 45.

> May 29 13:04:25.42: [  714]: RECV training at v.17 12000 bit/s
> May 29 13:04:25.42: [  714]: <-- [11:AT+FRM=121\r]
> May 29 13:04:27.13: [  714]: --> [7:CONNECT]
> May 29 13:04:28.64: [  714]: RECV: TCF 2268 bytes, 14% non-zero, 66
> zero-run
> May 29 13:04:28.64: [  714]: RECV: reject TCF (too many non-zero, max
> 10%)
> May 29 13:04:28.64: [  714]: RECV: reject TCF (zero run too short, min
> 1500)

At 12000 bps TCF should be approximately 2250 bytes.  Again, you seem 
to be getting roughly the right amount of data, but the longest 
zero-run is too short.

These indicate that the connection between the receiver and the 
transmitter is of too poor quality to reliably transmit facsimile image 
data at either 14400 or 12000 bps.

Assuming faxes from other locations are received properly, see if you 
can get the transmitter to slow down the negotiating speed to 9600.

If that doesn't work, then you'll need to adjust Class1TCFMaxNonZero 
and Class1TCFMinRun... but you'd likely have problems with copy quality 
after that and need to adjust MaxConsecutiveBadLines and/or 
PercentGoodLines, and after that you'd probably just end up with a very 
bad-looking, unreadable facsimile image.

Lee.

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