What is the number of the ADSL2+ subbands?

(single) Regarding the MA5600T/MA5680T Ethernet access service board, which of the following statements is correct?

(single) The MA5600T/MA5680T system has a super user level by default. It cannot be added or deleted. What is the default super user name/password?

(single) Is the following description correct? G.SHDSL broadband access technology is suitable for hotels, Internet cafes, high-speed Internet access, video conferencing, etc., but can not provide dedicated line interconnection and dedicated line access.

Which of the following do northbound interface types that U2000 provide for network management include? (Multiple choice)