Re: [hylafax-users] 2-DMR: faxgetty and faxmodem defaults

[Giulio Orsero <giulioo@pobox.com>]

On 24 Oct 2000 23:14:47 +0300, you wrote:

>> When using faxgetty, 2D is used automatically, if possible.
>> When using faxmodem (no faxgetty), the default is not to use 2D unless
>> one says otherwise using appropriate faxmodem parameters.
>Yes, because without faxgetty Hylafax cannot query the modem's
>capabilities.
I understood that there's no way to query capabilities from a class1
modem, so how does faxgetty decide to do 2D on the modem?
Maybe, it sees that it's a class1 modem, so that 2D is always possible?
And, if so, why can't faxmodem (it can see if it's a class1 by looking
at config.<devid>) do the same?

> But why is it interesting for you? Normal faxgetty-controlled 
>operation is always preferable even in send-only environment.
Because in some cases we use a prog called "callback" that is part of
mgetty package. callback wants "mgetty" to be in respawn on the line,
else it won't work. Another reason is that I've not yet been able to
have adaptive answer to work correctly.

>Class2/2.0: both the modem and the software should support 2-D
>Class1:     the software support is enough (Class1 modems have no idea about
>            data they send/receive) 
So why doing "faxmodem <devid>" on a class1 modem is not enough to
enable 2D?

>> 1) why does faxmodem (without any argument) default to tell hfaxd that
>> the modem has different capabilities than the ones determined by
>> faxgetty?
>See above. faxmodem cannot query actual modem's capabilities, so mandatory
>ones (which are guaranteed to be supported by any modem) are reported by
But faxmodem knows if the modem operates in class1 or class2.0 by
looking at config.<devid>, so that in case of a class1 it could enable
2D.

>> 2) if the 1D, 2D, ... does not depend on the modem  for class1, what's
>> the maximum we can safely use? (0,1)  or  (0,1,2)  or (0,1,2,3) (I'm
>> referring to http://www.hylafax.org/HylaFAQ/Q803.html)
>1. Class2 capabilities has nothing to do with Class1.
Yes, but the only way I could enable 2D with faxmodem on my class1
modem,  has been to look at that faq of yours and then specify
capabilities with 
faxmodem -c'....'

>2. Anything but 1-D MH and 2-D MR is not supported by Hylafax. The same is
>true for higher resolutions (more than 196x204dpi)
So the max for the 5th parameter is (0,1)  for a class1 modem?

Basically, what I'm wondering is "If 2D entirely depends on HylaFAX when
using a class1 modem, then why doesn't HylaFAX always enable 2D if it
operates on a class1 modem (either using faxgetty or faxmodem)?"

Thanks.

-- 
giulioo@pobox.com


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