CONFIG_ISDN_DRV_SC
  This enables support for the Spellcaster BRI ISDN boards.  This
  driver currently builds only in a modularized version ( = code which
  can be inserted in and removed from the running kernel whenever you
  want, details in <file:Documentation/modules.txt>); the module will
  be called sc.o.  See <file:Documentation/isdn/README.sc> and
  <http://www.spellcast.com/> for more information.