Free Access Huawei.H31-311_V2.5.v2024-10-03.q257 Practice Test (Page 47)

Question 226

The essence of OPSK modulation is to reduce the baud rate of the optical signal by half without reducing the line rate by washing four possible values on the phase of the optical field; this multiplexing method can reduce the spectral bandwidth of the optical signal by half, making multi-wavelength ULH transmission with 50GHZ interval and 40G line rate possible.

A.FALSE

B.TRUE

Question 227

Which of the following statements regarding the protection of the cross-connecting plate 1+1 is correct?
(Multiple choice).

A.The source business board sends services to the main and standby crossover boards. .

B.After the service cross-connection is completed, the active and standby cross-board sends the data of the primary cross-board to the receiving service board.

C.The bus of the two cross-connected modules works independently and does not interfere with each other. .

D.Both cross-connecting plates have the same configuration. The service board will selectively receive services from one of them based on the quality of service and the status of the cross-connecting board. .

E.Dual bus system structure indicates that the service board performs dual data transfer to the cross-connection side and selectively receives data on the cross-connection side. .

F.The receiving service board can only receive data from the active cross-link board

Question 228

Erbium-doped fiber amplifier (EDFA) is a key component of the new generation of optical communication systems. Which of the following is the function of EDFA? (Multiple choice)

A.Low noise index

B.High output power

C.High gain

D.Amplification of any wavelength

Question 229

Among the maintenance signals at the ODUk level, which of the following maintenance signals are included in the STAT bits of PM and TCM? (Multiple choice)

A.AAIS

B.LCK

C.IAE

D.OCI

Question 230

In Ethernet, the frame length has a lower limit, which is mainly due to the following considerations?

A.Carrier Sense

B.Conflict Detection

C.Improve network bandwidth utilization

D.Multi-point access

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Question 226

Question 227

Question 228

Question 229

Question 230

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