Jacques Goldberg's linmodem site has recent drivers that are newer than on the Smartlink site.
Smart Link has supplied a binary driver for various versions of Redhat to their OEM customers.
A copy is available from Aztech here: Aztech driver page
Most users will be unable to use this driver in its current form.
Si3012-BS Phone Line Interface N. A./JPN 16-pin SOIC -40 to 85 C Si3012-KS Phone Line Interface N. A./JPN 16-pin SOIC 0 to 70 C Si3014-BS Phone Line Interface International 16-pin SOIC -40 to 85 C Si3014-KS Phone Line Interface International 16-pin SOIC 0 to 70 C Si3024-BS AC97 Interface 16-pin SOIC -40 to 85 C Si3024-KS AC97 Interface 16-pin SOIC 0 to 70 C HAMR5603 AC97 Interface 16-pin SOIC SL1500 PCI Bus Interface 80-pin LQFP SmartPCI56-INT = Si3012 + HAMR5603 + SL1500 SmartPCI56-INT = Si3014 + HAMR5603 + SL1500