zSeries systems require that any FCP (Fibre Channel protocol) device be entered manually in order for the installation program to recognize the hardware. The values entered here are unique to each site in which they are setup.
Each value entered should be double checked as any mistakes made may cause the system not to operate properly.
For more information on these values, refer to the hardware documentation that came with your system and check with the system administrator who has setup the network for this system.