The overhead ratio is a factor that affects the error correction capability of the FEC technology. Generally, when the same FEC encoding/decoding algorithm is used, the higher the overhead ratio is, the larger the net coding gain is.

• A.True
• B.False

Comment: *

Name: *

Email: *

Verification: *

When the OSN 8800 needs to access GE signals, the boards that can be used are: (Multiple Choice)

• A.TEM28
• B.TOA
• C.TSC
• D.TDX

Comment: *

Name: *

Email: *

Verification: *

The network element automatically backs up the network element database to the FLASH database every 30 minutes by default.

• A.TRUE
• B.FALSE

Comment: *

Name: *

Email: *

Verification: *

Which of the following methods can be used to analyze faults in the NG WDM system?

• A.RMON
• B.Loopback
• C.Service Signal Flow Analysis
• D.Replacement

Comment: *

Name: *

Email: *

Verification: *

Loopback is a common operation for routine maintenance and troubleshooting. Which of the following statements about loopback operations are incorrect?

• A.The hardware loopback is performed by using the fiber jumper or self-loop cable to perform the loopback on the optical port or electrical port.
• B.When performing a hardware loopback on an optical port, you need to add an optical attenuator.
• C.After the inloop is performed, the signals are transmitted to the external.
• D.After the outloop is performed, the signals are transmitted to the internal.

Comment: *

Name: *

Email: *

Verification: *