The following three optical layer protections have different protection ranges. Arrange them in ascending order. Which one is the correct one?

• A.In-board 1+1 protection -> optical line protection -> client side 1+1 protection
• B.Optical line protection -> client side 1+1 protection -> intra-board 1+1 protection
• C.In-board 1+1 protection -> client side 1+1 protection -> optical line protection
• D.Optical line protection -> In-board 1+1 protection -> Client side 1+1 protection

Comment: *

Name: *

Email: *

Verification: *

The nominal rate of the OTU4 signal is 111 809 973.568 kbit/s, and we generally think that the line rate is about 112G.

• A.False
• B.True

Comment: *

Name: *

Email: *

Verification: *

Which of the following description about SW SNCP protection is wrong?

• A.The crossover granularity is GE or Any signal
• B.The trigger conditions are that the board is not in place, SF, SD
• C.When configuring SW SNCP, you need to set the SNCP type
• D.SW SNCP protects the OCh channel by using the dual transmission and selective reception function of electrical layer crossover

Comment: *

Name: *

Email: *

Verification: *

If a network port that supports auto-negotiation is connected to a network port that does not support auto-negotiation, half-duplex and full-duplex modes can be interconnected.

• A.True
• B.False

Comment: *

Name: *

Email: *

Verification: *

Which of the following statements are true about the EFS4 circuit board? (Multiple choice)

• A.This board must be used with the processing board
• B.The board supports Layer 2 switching
• C.The board has four FE ports
• D.The board interface is LC interface

Comment: *

Name: *

Email: *

Verification: *