Re: [hylafax-users] [SOLVED] RE: factors in bad scan lines

[Dmitry Bely <dbely@mail.ru>]

Lee Howard <faxguy@deanox.com> writes:

> Thanks all for the pointers.  I did check the Copy Quality
> Checking/Correcting settings that Dmitry metioned in his mail that Bernd
> passed along.  AT+FCQ=? isn't broken on these modems (also now testing on a
> Best Data 2834VF) as it is on the USRs, so it does report that it has no
> copy quality checking option (only 0 is reported), however, I did hard-code
> it via !(0),(0) anyway with no noticable improvement.  I looked into the
> S-command registers as suggested by Jay, but honestly felt overwhelmed
> (like, isn't everything in an s-register somewhere?).

Better forget about them when using the modem in fax mode :-)

> So I got looking around into others' config files and noticed something,
> and although I made some changes such as AT&K4 to AT&K6 and AT&K3 to AT&K6
> also, I think that the bottom line ended up being the change of:
> 
> ModemRecvFillOrder:	LSB2MSB
> to
> ModemRecvFillOrder:	MSB2LSB
> 
> in the config file.  I never would have caught that on my own.  So, I guess
> that my question is, how are you supposed to know the proper settings for:
> 
> ModemSendFillOrder
> ModemRecvFillOrder
> ModemFrameFillOrder
> 
> as I've never seen them listed in any manual?

What about T.30? :-)

The correct settings are:

Class1:
ModemSendFillOrder      LSB2MSB
ModemRecvFillOrder      LSB2MSB
ModemFrameFillOrder     LSB2MSB

Class2:
ModemSendFillOrder      LSB2MSB
ModemRecvFillOrder      MSB2LSB (infamous Rockwell bug)
ModemFrameFillOrder     Not applicable

Initially Rockwell was introduced this bug in its modem's data pump (Class2
also assumed LSB2MSB), which most software and hardware makers had to
follow. I know the only exception -- non-Rockwell Multitech modems, that
implements the original Class2 specs and use LSB2MSB for ModemRecvFillOrder.

Class2.0:
ModemSendFillOrder      LSB2MSB
ModemRecvFillOrder      LSB2MSB
ModemFrameFillOrder     Not applicable

Hope to hear from you soon,
Dmitry




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