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Huawei Certified Internetwork Expert-Transmission Sample Questions:

1. The following is wrong about the position of the dispersion module in the signal flow.

A) The OTM station usually pre-fills 20KM DCM before sending OBU
B) If there is only one OBU board, the DCM is placed after the OBU
C) If there are two OBU boards, the DCM is placed between the two OBUs
D) If there is an OAU board, DCM is placed between OAU's TDC/RDC

2. It is known that the technical indicators of the GE optical interface of a certain PTN equipment are as follows: average transmit optical power (dBm): -5~0, receiving sensitivity (dBm): -23, minimum overload point (dBm): -3, minimum extinction ratio (dB) ): 9. For this optical interface, which of the following optical power (dBm) is the most suitable received optical power?

A) -15
B) -3
C) 0
D) -5

3. The optical power of one wave is 3dBm, and the optical power of the other wave is 5dBm. The total optical power after the two waves are combined is 3+5 = 8dBm

A) FALSE
B) TRUE

4. After the 10G system wavelength division commissioning is completed, it is found that the OSNR value of the single wave scanned by the receiving MCA is very good, but the bit error rate before error correction is very poor. The possible reasons are (multiple choices)

A) Unreasonable dispersion compensation
B) The line attenuation is greater than the design value
C) An optical equalization station is used in the middle
D) Unreasonable optical power commissioning

5. The following clock networking optimizations are wrong:

A) Under the non-SSM switching protocol, the clock network can only be configured as one-way and cannot form a loop.
B) Under the standard SSM switching protocol, the clock can be configured as bidirectional, but it must not be configured as a ring. Enable the extended SSM protocol to solve the clock loop problem by assigning a clock ID to the clock source.
C) For PDH, ITU-T stipulates that 4 consecutive odd frames sa4~sa8 in 2M bit signal TS0 are used to transmit quality information, and SDH uses S1 byte b5-b8 to transmit the same quality information. SDH equipment can automatically extract SSM information from the 2Mhz external clock signal provided by the BITS equipment, so as to know the quality level of the timing signal.
D) Timing reference clock transmission link, requires that at most N=20 network elements, the transit office clock must be introduced for clock reshaping and regeneration (high-quality clocks are serialized), up to K=10 transit office clocks, clocks The maximum number of G.813 clocks on the link does not exceed 60.

Solutions: