Which of the following statements is correct. when the MA5800 downlink fiber connection? (Multiple choice)
A . One end is connected to the main control board, and the other end is connected to the ODF frame.
B . When the fiber is laid at the inflection point, pay attention to the need to bend, cannot be folded into 90 degrees
C . Fiber needs to be tied
D . Downstream adopts SC type fiber
Answer: BCD