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Huawei HCIA-Transmission V2.5 Sample Questions:

1. Automatic gain control (AGC) can solve the problem of increased optical power in multi-wavelength systems where the increase in wavenumber or decrease in derivative energy transfer affects normal operation.

A) False
B) True

2. Which of the following descriptions of LCAS is wrong?

A) When some members fail, other members still transmit data normally; when the failed members are repaired, the bandwidth of the virtual cascade group can be automatically restored.
B) Use SDH overhead bytes (high-order virtual concatenation uses K4, low-order virtual concatenation uses H4) to carry control information and perform handshake operations between the source and the sink
C) If the belt curtain of a VCTrunk is not suitable and needs to be increased or decreased, the belt curtain can be adjusted through LCAS, which only requires increasing or decreasing the number of VCTrunk members to achieve smooth belt curtain upgrade without interrupting business
D) TR_TIMR is the waiting time for recovery, which refers to the time it takes for the time slot shielded by LCAS to be added to the LCAS virtual cascade group after it changes from bad to good.

3. The error correction capability of FEC is measured by coding gain. Which of the following statements about coding gain is wrong?

A) The coding gain of AFEC is greater than the coding gain of FEC
B) The correction capability of FEC increases with the coding gain.
C) When BER is constant, the OSNR preserved by correction coding is called coding gain.
D) The coding gain of in-band FEC is greater than the coding gain of out-band FEC

4. After configuring PDH services on a per-network element basis, a complete trace cannot be searched. Which of the following is a possible reason? (Multiple choice)

A) Wrong selection of branch plate
B) No direct access is configured at the intermediate site
C) The time period is wrongly configured
D) Wrong circuit board selection

5. Which of the following is the electrical layer overhead of OTN? (Multiple choice)

A) Och
B) ODUk
C) OPUk
D) OTUR

Solutions: