Description: The main subtree for system management, following functionalities included. -- NE(such as OLT) system management -- SNMP user, erroring management -- CLI user management -- LCT management -- SSH management -- System RTC(Real-time Clock) management -- System NTP management -- Alarm and event management -- SYSLOG management -- NE(such as OLT) software version management -- Hardware detection management -- System broadband management -- Remote Unit(such as ONU) software version management -- Remote Unit(such as ONU) channel management -- Remote Unit(such as ONU) file management -- Remote Unit(such as CPE) access control management -- Data backup management -- File management, File server management -- Configuration synchronization management -- Flash and Configuration data management -- AAA, Radius, Tacacs+ management -- Performance management -- Log management -- DNS management