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Nokia Optical Diagnostics and Troubleshooting Sample Questions:

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

A) Ingress amplifiers are always more powerful [than egress amplifiers, to reduce the impact of non-linear effects.
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) The Optical Supervisory Channel (OSC) is amplified when passing through all amplifier types, except for Raman which is not based on EDFA.
D) When channels pass through amplifiers, all of them always experience a similar amplification.

2. Which of the following statements correctly describes where power adjustments can be performed?

A) In bidirectional configurations, both ingress and egress power adjustments are performed against the ingress amplifiers only.
B) In unidirectional configurations, both ingress and egress power adjustments are performed against the ingress amplifiers only.
C) When Raman pumps are used, both ingress and egress power adjustments are performed against the Raman pump directly.
D) In bidirectional configurations, ingress power adjustments are performed against the ingress amplifiers, while egress power adjustments are performed against the egress amplifiers.

3. Consider the exhibit. What do the different colored green columns indicate?

A) Optical power levels measured for multiple wavelengths against a specific interface.
B) The average optical power levels measured for multiple wavelengths throughout their shared optical path.
C) Optical power levels measured multiple times against a specific interface, at 24-hour intervals for the same wavelength.
D) Optical power levels measured at different interfaces throughout the optical path of a single wavelength.

4. Suppose a channel-related alarm is reported on an 1830 PSS node, and is related to a possible Wave Keys clock source issue. What is the recommended order for the following troubleshooting steps?

A) 1. Replace the suspect PF.
2. Retrieve the channel power trace.
3. Switch to alternate clock source (PF).
4. Determine the active clock reference source.
B) 1. Retrieve the channel power trace.
2. Determine the active clock reference source.
3. Switch to alternate clock source (PF).
4. Replace the suspect PF.
C) 1. Determine the active clock reference source.
2. Replace the suspect PF.
3. Retrieve the channel power trace.
4. Switch to alternate clock source (PF).
D) 1. Retrieve the channel power trace.
2. Replace the suspect PF.
3. Determine the active clock reference source.
4. Switch to alternate clock source (PF).

Solutions: