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Nokia Optical Networking Fundamentals Sample Questions (Q15-Q20):

NEW QUESTION # 15
Which of the following statements about Wavelength Tracker monitoring points in CDC-F architecture is TRUE?

A. Wavelength Tracker monitoring points are settled on IRDMxx line interfaces and on CWR CLS interfaces.
B. Wavelength Tracker monitoring points are settled on ITL mux interfaces and on OTs line interfaces.
C. Wavelength Tracker monitoring points are settled on IRDMxx line interfaces only.
D. Wavelength Tracker monitoring points are settled on IRDMxx and OTs line interfaces.

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
In a CDC-F (Colorless, Directionless, Contentionless, Flex-grid) architecture, the placement of monitoring points is vital for end-to-end visibility of wavelengths. Nokia's Wavelength Tracker technology relies on these points to detect the unique "keys" or signatures associated with each wavelength. In a CDC-F node, the primary monitoring points are located on the IRDMxx (Intelligent Reconfigurable Demultiplexer/Mux) line interfaces and the CWR (Colorless Wavelength Router) CLS (Colorless) interfaces.
The IRDM monitoring points allow the system to verify the power and presence of wavelengths as they enter or leave the fiber spans (degrees). The CWR CLS monitoring points are critical because they provide visibility at the "Colorless" add/drop stage. By having monitoring at both locations, the WaveSuite Network Operations Center (WS-NOC) can pinpoint exactly where a signal loss or power degradation is occurring-whether it's in the external fiber plant or within the internal colorless switching fabric of the ROADM. This granular visibility is what allows Nokia's "Power Management" to automate balancing across complex mesh topologies.

NEW QUESTION # 16
Which of the following statements is true about chromatic dispersion (CD)?

A. The fiber attenuation introduces inter-channel interference.
B. The fiber attenuation changes along the fiber, and when the light crosses these differences the CD takes place.
C. Different wavelengths propagate at different speeds within the same media and therefore different colors travel in the fiber with different speed.
D. Different channels have different bandwidth and this causes different CD performances.

Answer: C

Explanation:
Different wavelengths propagate at different speeds within the same media and therefore different colors travel in the fiber with different speed. This phenomenon is known as chromatic dispersion and causes light to spread out as it travels through the fiber over distance, leading to signal attenuation and distortion. The fiber attenuation does not introduce inter-channel interference, but it can cause attenuation of the signal. Different channels have different bandwidths, but this does not affect CD performance.

NEW QUESTION # 17
WDM allows transmission systems to:

A. Share a single signal among multiple fibers doing load balancing, and thus increasing the reliability of the optical transmission
B. Increase the bit rate of each client signal by spreading it over multiple wavelengths
C. Allocate different signals to different time slots
D. Transport multiple signals transparently, onto several wavelengths, all together over one single fiber

Answer: D

NEW QUESTION # 18
How many PM bins can be stored, for each data collection point, on PSS systems?

A. 33 x 15-min bins, 8 x 1-day bins and 1 raw bin.
B. 4 x 15-min bins and 1 x 1-day bin.
C. 200 x 15-min bins, 90 x 1-day bins and 1 raw bin.
D. 120 x 15-min bins, 60 x 1-day bins and 1 raw bin.

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
Performance Monitoring (PM) is critical for maintaining the health of a Nokia 1830 PSS network. The system collects data such as FEC corrected bits, optical power levels, and ODU-layer errors. According to Nokia's standard node management architecture, each data collection point (such as an optical port or an ODU termination point) stores a specific number of historical "bins" locally on the card or the shelf controller.
The standard storage capacity for these PM statistics is 33 x 15-minute bins (covering the last 8 hours and 15 minutes of granular data) and 8 x 1-day bins (covering the last week of daily totals). Additionally, there is 1 raw bin which contains the "current" accumulating data that has not yet been shifted into a completed 15-minute or 24-hour historical bin. This allows network operators using WS-NOC (WaveSuite Network Operations Center) to retrieve recent historical performance data directly from the NE (Network Element) even if the management system was temporarily disconnected. If longer-term history is required, the management system must be configured to poll and archive these bins into its own database before they are overwritten on the hardware.

NEW QUESTION # 19
How are the EPT systems related to NFM-T when CPB is performed?

A. The systems are displayed on the CPB panel, however they cannot be individually selected as they need to run all together
B. The systems are not reported on CPB, as this Is transparent to the user and the whole network is validated and provisioned in one step
C. The systems are displayed on the CPB panel and they can be individually selected
D. The systems are not reported on CPB, but only through the Equipment Manager

Answer: C

Explanation:
The EPT systems are displayed on the CPB (Commissioning Parameter Builder) panel and they can be individually selected. This allows the user to configure the network elements in the network and provision them according to their specific requirements. The systems are not reported on CPB, but through the Equipment Manager. The Equipment Manager is the interface used to configure the network elements and the EPT systems. The NFM-T is not related to the CPB and does not affect the CPB process.

NEW QUESTION # 20
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