asterisk users - Oct 2009 - What dahdi_dynamic and dahdi_transcode modules are for?

I want to know what dahdi_dynamic and dahdi_transcode modules are for.
What are they purpose?.
I have read in this thread:
http://www.mail-archive.com/asterisk-users at lists.digium.com/msg180595.html

That dahdi_transcode is for the TC400B transcoder card. But this does not
seems to be true, because in the oficial documentation of the card, does not
mention at all to load this module.

...and dadhi_dynamic?

Where i can find more info about this two modules does?

Thank you.

Gonzalo
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