What are differences between options "always-on" and "once-on" in password authentication of an ONU (MA5680T)?
always-on: When this option is selected, it indicates that each time an ONU go online, the ONU is authenticated in the password mode, and the MAC/SN parameter is not required for registration.
once-on: If this option is selected, when an ONU goes online for the first time, it is authenticated in the password mode in a specified period. After authentication, the ONU is bound to the MAC/SN. Then, if the ONU goes online next time, it is authenticated by MAC/SN instead of password.