create sdlc link

   The create sdlc link command creates an instance of the SDLC Link
   subentity for each physical line, which manages all stations on the
   line.  Creation also allocates resources for the subentity, and set
   its characteristics to their default values.

   Ex,   ncl> create sdlc link sdlc-1 line modem connect line line-0, -
         _ncl> capability primary