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Nokia Optical Diagnostics and Troubleshooting Sample Questions (Q18-Q23):

NEW QUESTION # 18
Suppose a node is experiencing a little unexpected attenuation over the Optical Supervisory Channel (OSC) transmit direction. Which of the following statements is FALSE?

A. A Power adjustments action will fail on the local node.
B. Traffic will pass between the local and adjacent node.
C. No OSC-related alarms will raise on the local node.
D. A "Data Link Down" alarm will raise on the adjacent node.

Answer: C

Explanation:
Explanation
The statement that is false is that no OSC-related alarms will raise on the local node. OSC stands for Optical Supervisory Channel, which is a dedicated wavelength used for out-of-band signaling and management of optical network elements. If a node is experiencing a little unexpected attenuation over the OSC transmit direction, it means that the OSC signal is weaker than expected when it reaches the adjacent node. This can cause a "Data Link Down" alarm to raise on the adjacent node, indicating that the OSC communication link is broken or degraded. However, this can also cause an "OSC Power Low" alarm to raise on the local node, indicating that the OSC transmit power is below the threshold. Therefore, there will be OSC-related alarms on both nodes. The other statements are true because a power adjustment action will fail on the local node due to insufficient OSC power, and traffic will pass between the nodes as long as there is no other issue affecting the data channels. References: Nokia Optical Diagnostics and Troubleshooting Course, Optical Supervisory Channel Module product data sheet

NEW QUESTION # 19
Which of the following statements correctly describes where power adjustments can be performed?

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

Answer: C

Explanation:
Explanation
In bidirectional configurations, where the same fiber is used to transmit signals in both directions, power adjustments can be performed at both ingress and egress amplifiers. The ingress power adjustments are performed against the ingress amplifiers, which boost the incoming signals from the opposite direction. The egress power adjustments are performed against the egress amplifiers, which boost the outgoing signals from the same direction2. Therefore, the statement A is correct. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical amplifiers, explained by RP; optical amplification

NEW QUESTION # 20
Which of the following statements about the Wavelength Tracker (WT) capability is TRUE?

A. WT is compatible with other vendor domains, but the user must make sure that Wave Keys are unique on the crossed domains.
B. WT uses a unique identifier based on a pair of numbers encoded by Raman amplifiers into each service wavelength direction.
C. WT uses a unique identifier based on a pair of numbers encoded by Optical Transponders OTs) into each service wavelength direction.
D. Wave Keys are originated by optical amplifiers.

Answer: C

Explanation:
Explanation
The statement that WT uses a unique identifier based on a pair of numbers encoded by Optical Transponders (OTs) into each service wavelength direction is TRUE. WT is a feature of the 1830 PSS that allows for automatic identification and tracking of wavelengths across different network elements and domains. WT uses Wave Keys, which are unique identifiers composed of two numbers: a Wave Key ID and a Wave Key Code. The Wave Key ID identifies the OT that generates the wavelength, while the Wave Key Code identifies the wavelength itself within a given OT6. The Wave Keys are encoded by OTs into each service wavelength direction using phase modulation, and can be decoded by other OTs or amplifiers that have WT capability.
WT enables various applications and benefits, such as simplified commissioning, automated wavelength routing, enhanced fault localization, and improved network security. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical User Guide - Nokia, Alcatel-Lucent 1830 PSS-8 and PSS-16 Photonic Service Switch

NEW QUESTION # 21
Which of the following issues can cause a "Loss too low" message to be displayed after a power adjustment has been provided?

A. A defective WSS unit
B. An incorrect EPT network design
C. A dirty fiber connector
D. Unstable optical power levels

Answer: D

Explanation:
Explanation
A "Loss too low" message can be displayed after a power adjustment has been provided if there is an issue with unstable optical power levels. Unstable optical power levels can be caused by various factors, such as environmental conditions, fiber aging, equipment malfunction, or configuration errors. Unstable optical power levels can affect the accuracy and reliability of the power adjustment process, which relies on measuring the optical loss between two points in the network. A "Loss too low" message means that the measured optical loss is lower than the expected value, which can indicate a problem with the optical signal quality or integrity.
The other issues are incorrect because they either cause a different type of message or do not affect the power adjustment process. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide

NEW QUESTION # 22
Consider the exhibit. A single directional fiber cut is occurring between two amplifiers in unidirectional configuration with Raman pump.
Multiple services are crossing the affected span.
Which node(s) will report an Incoming Payload LOS" alarm?

A. Both Node A and Node C
B. No node, as a Raman pump is used in Node A.
C. Node C only.
D. Neither Node A nor Node C.

Answer: A

Explanation:
Explanation
A single directional fiber cut is occurring between two amplifiers in unidirectional configuration with Raman pump. Multiple services are crossing the affected span. The node(s) that will report an Incoming Payload LOS alarm are both Node A and Node C. An Incoming Payload LOS alarm indicates that there is no or very low signal at the input port of a node. In the exhibit, Node A will report this alarm because it will not receive any signal from Node B due to the fiber cut. Node C will also report this alarm because it will not receive any signal from Node D due to the fiber cut. The Raman pump in Node A does not prevent this alarm, as it only amplifies the signal in the forward direction, not the backward direction. The other options are incorrect because they either ignore one of the nodes that will report the alarm or assume that the Raman pump has an effect on the backward direction. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide

NEW QUESTION # 23
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