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Nokia Optical Diagnostics and Troubleshooting Sample Questions:

1. Which of the following statements best describes the output of the command: show xc 1?

A) A list of all boards on all nodes that this cross-connection passes through, along with expected power levels, measured power levels, and allowed power deviations.
B) OCH trail name, ITU channel, administrative/operational states, protection states, and Wave Keys for both directions.
C) A list of cross-connections, including A-end, Z-end, frequency, ID number, OCH trail name, and administrative/operational states.
D) A list of boards that this cross-connection passes through on the local node, along with administrative/operational states, expected power levels, and measured power levels.

2. Which of the following statements about optical power vs amplification stages is TRUE?

A) The Optical Supervisory Channel (OSC) is amplified when passing through all amplifier types, except for Raman which is not based on EDFA.
B) When multiple channels pass through a shared port (for example, an amplifier line interface), the total aggregated power reflects the number of channels currently present.
C) Ingress amplifiers are always more powerful [than egress amplifiers, to reduce the impact of non-linear effects.
D) When channels pass through amplifiers, all of them always experience a similar amplification.

3. Which of the following statements best describes the Forward Error Correction (FEC) technique?

A) FEC enables errors to be detected and data to be retransmitted. This technique is effective only below a specified OSNR threshold.
B) FEC enables errors to be detected and corrected without retransmission. This technique is effective only above a specified OSNR threshold.
C) FEC enables errors to be detected and corrected without retransmission. This technique is effective only below a specified OSNR threshold.
D) FEC enables errors to be detected and data to be retransmitted. This technique is effective only above a specified OSNR threshold.

4. Consider the exhibit.

Which type of loopback is applied?

A) Line port terminal Ioopback
B) Client port facility loopback
C) Line port facility Ioopback
D) Client port terminal Ioopback

Solutions: