Int 6B Fn 0700  - Novell Nasi/nacs, Ungermann-bass Net One Serial I/o - G  [S]

   AX = 0700h

Return: CH <> 00h if connection active

Notes: this function is also supported by TelAPI and NPC NCSI
   Novell TelAPI returns CX=FF01h and CF clear

See Also: AH=02h,AH=10h