H31-311 무료 덤프문제 온라인 액세스

Which of the following are communication quality alarms? (Multiple Choice)

• A.No login of an NE user
• B.Loss of optical signals
• C.NE communication interruption
• D.Optical port loopback

The error correction capability of FEC is measured with the encoding gain. Which of the following statements about the encoding gain is incorrect?

• A.When the BER is constant, the OSNR saved by the correction encoding is called encoding gain.
• B.The encoding gain of AFEC is larger than that of FEC.
• C.The encoding gain of the inband FEC is larger than that of the outband FEC.
• D.The error correction capability of FEC increases with the encoding gain.

The PRBS can be used to test whether an SDH service is normal and whether the protection switching function is normal.

• A.FALSE
• B.TRUE

When the U2000 data is backed up using scripts, the backup is fast because the backup files are small.

• A.FALSE
• B.TRUE

In the case of SNCP, a line board selectively receives services. Therefore, the SNCP can protect the services on the line.

• A.FALSE
• B.TRUE