The CPRI protocol between BBU and RRU is private protocol.

When the number of RRU3151 series RRU cascade is more than 1 level, 2.5G optical module is changed to single-mode 6.144G optical module; original light module which less than or equal to 1 level can be still used.

Which kind of interfaces on the UMPT board can be used for S1 interface transmission? (Multiple choice)

DCDU-12B provides 10-channel-48V DC power output, the same fuse configuration, which can meet the power distribution requirements of indoor and outdoor macro stations, small base stations and distributed base stations.

Which of the following events can be used by the frequency switching based on the coverage to make a decision? (Multiple choice)