I understand that too, but in the Dev. Mappings Document it is written:
The presence of a device in the file device_mappings.txt does not indicate, expressed or implied, support of the device on the target NetBackup platform. Refer to the NetBackup Hardware Compatibility List, found below in the Related Documents section, for such support statements.
The TS7520 is not listed in the HCL for NBU 5.x....
Thx anyway...