Library /sys$common/syshlp/nclhelp.hlb SNA Peer Server Module, SDLC, Link subentity, disable  *Conan The Librarian (sorry for the slow response - running on an old VAX)

   disable sdlc link

   The disable sdlc link command disables an instance of the SDLC Link
   subentity.  You can only disable a previously enabled entity.  The
   disable command stops the operation of the Link subentity.  To be
   successful with this command, all Station subentities on the Link
   must have been disabled.  At the completion of the command the
   subentity is off.

   Ex,   ncl> disable sdlc link sdlc-0