一：
1. ONU-G: This managed entity represents the ONU as equipment.
2. ONU2-G: This managed entity contains additional attributes associated with a PON ONU. (1) Ethernet connectivity mode, (2) QoS configuration flexibility.
3. ONU data: This managed entity models the MIB itself.
4. Software image: This managed entity models an executable software image stored in the ONU.
5. Cardholder: The cardholder represents the fixed equipment slot configuration of the ONU.
6. Circuit pack: This managed entity models a real or virtual circuit pack that is equipped in a real or virtual ONU slot.
7.
二： OMCI message syntax and common features