USRobotics NETServer/8 - Manual (Page 242)

C-4 Software Download
-nna specifies the .nac filename prefix (required):
(pn = NETServer/8 and NETServer/16 NAC
file)
-d specifies the directory path name (optional);
should be followed by the directory name where
the operation and SDL software is stored
Note: If an operator enters an invalid parameter or an
insufficient number of required parameters, the pcsdl program
displays a help screen specifying the correct command syntax.
Optional -d Parameter
The d option tells the SDL program to retrieve the operation and
SDL program files from the specified directory. Otherwise, the
SDL program assumes that the program files are in the current
directory.
Filename Prefixes
Filename prefixes are required to specify both the type of .sdl
file (software download utility) and .nac file (operational code)
to use in the download.