The overhead ratio is a factor that affects the error correction capability of FEC technology. Generally, under the same FEC encoding/decoding algorithm, the higher the overhead ratio, the greater the net coding benefit.

• A.FALSE
• B.TRUE

Comment: *

Name: *

Email: *

Verification: *

Which of the following description of the principle of automatic protection switching of the standard SSM protocol are correct? (Multiple choice)

• A.The network element broadcasts the clock quality information and the clock source ID of the synchronization source through the downstream station between the S1 bytes, and notifies the upstream station that the clock quality from the local network element is "not available for synchronization" by the S1 byte in the direction of the synchronization source.
• B.According to the clock source priority table, the network element first selects the clock with the highest quality level from the available clock sources as the homologous source.
• C.If there are multiple clock sources with the highest quality level, the network element selects the clock with the highest clock priority as the synchronization source.
• D.The network element broadcasts the clock quality information of the synchronization source to the downstream site through the S1 byte, and notifies the upstream station that the clock quality from the local network element is "not available for synchronization" by the S1 byte in the direction of the synchronization source.

Comment: *

Name: *

Email: *

Verification: *

Which of the following description is wrong about the content of the formula for calculating the maximum line rate (N=Ratc/((L+7+1+M)x8))?

• A.M is the frame gap, and the minimum IFG (minimum frame gap) is 8 bytes.
• B."8" outside the brackets is 1 Byte containing 8 Bits
• C.L is in standard Ethernet frame length with a minimum value of 64Bytes
• D.Rate indicates the line rate of the physical layer. If the device port is FE, then Rate=100Mbit/s.

Comment: *

Name: *

Email: *

Verification: *

When performing fiber synchronization, the network element does not create a fiber. What does it indicate?

• A.Fiber connection exists only on the local network management side.
• B.Fiber connection that does not exist on the network management side and the NE side.
• C.The fiber connection exists on both the network management side and the network element side.
• D.Fiber connection only on the NE side.

Comment: *

Name: *

Email: *

Verification: *

The following is the client-side logical port of the board in the standard mode.

• A.ODUkLP-n
• B.RX/TX-n
• C.ClientLP-n
• D.n(Nn/OUTn)-OCH: 1-ODUk: m-ODUp:a

Comment: *

Name: *

Email: *

Verification: *