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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Optical Network Architecture and Nodes | 20% | - Network topologies and transport architectures - WDM node types and functionalities - Switched WDM (SWDM) principles |
| Topic 2: Optical Networking Basics | 20% | - Optical signal propagation and characteristics - Optical components and functions - Fiber types, properties and transmission principles |
| Topic 3: Network Management and Operations | 20% | - Network design with 1830 EPT / WaveSuite Planner - Performance monitoring, alarms and troubleshooting - NFM-T / WS-NOC management system overview - Network commissioning and monitoring |
| Topic 4: Network Survivability and Protection | 15% | - Protection and restoration mechanisms - Availability and survivability concepts - Path and line protection schemes |
| Topic 5: WDM Technology and Systems | 25% | - Wavelength Division Multiplexing concepts - Optical amplifiers and transmission engineering - DWDM system architecture and building blocks |
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NEW QUESTION # 25
By using the EPT run design command, are the previously designed elements removed?
Answer: D
Explanation:
The EPT run design command can remove previously designed elements, but the user is prompted to choose whether to delete them or leave them intact. This allows the user to progress their design while still keeping the existing elements in place. If the user selects to leave the existing elements, then they will remain in the same slots. If GMPLS nodes are used, the existing slots cannot change as they are controlled by another manager (GMRE).
NEW QUESTION # 26
What is a Shared Risk Group (SRG)?
Answer: A
Explanation:
According to the Nokia Optical Networking documentation, a Shared Risk Group (SRG) is defined as "a set of network resources that share a common failure risk. When a resource in an SRG fails, the other resources in the group are also affected." This can include fibers, boards, nodes, and other network resources. The SRG concept is used in network design and protection mechanisms to ensure survivability and minimal impact on service in case of a failure.
NEW QUESTION # 27
What is the main function of an optical amplifier?
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
The primary function of an optical amplifier in a WDM system is to provide gain to the optical signal to compensate for optical power attenuation (loss) that occurs as light travels through the optical fiber. As photons travel through kilometers of silica fiber, their energy is absorbed or scattered, leading to a reduction in signal strength. To ensure the signal reaches its destination with sufficient power for the receiver to detect it, amplifiers like the EDFA (Erbium-Doped Fiber Amplifier) or Raman amplifiers are placed at strategic intervals along the fiber span.
It is crucial to distinguish this from Option D; modern optical amplifiers perform purely optical amplification, meaning the signal stays in the photonic domain without being converted to electricity (O-E-O). While some specialized amplifiers (like the RA2P) might interact with other parameters, their fundamental job is power restoration. Furthermore, while amplifiers are essential for a network's reach, they do not compensate for chromatic dispersion-that is the job of Dispersion Compensation Modules (DCM) or electronic dispersion compensation (EDC) in coherent transponders-nor do they demodulate signals, which is the role of the receiver in a transponder.
NEW QUESTION # 28
What is the function of the express channel interface?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
In the context of WDM (Wavelength Division Multiplexing) node architecture, an express channel interface (often associated with OADMs or ROADMs) is specifically designed to handle "through" traffic. In a multi-node optical network, not every wavelength (channel) needs to be processed or terminated at every site it passes. To maintain signal integrity and reduce latency, these wavelengths are kept in the optical domain.
The express interface allows these optical channels-those not terminated or "dropped" at the local node-to bypass the local transponders and multiplexers, flowing directly to the downstream node. This photonic bypass avoids unnecessary O-E-O (Optical-Electrical-Optical) conversions, which would otherwise require expensive hardware and increase power consumption. By utilizing express paths, the Nokia 1830 PSS can scale to support massive core network capacities while ensuring that only the relevant traffic is diverted to the local client-facing ports.
NEW QUESTION # 29
When monitoring the quality of the received signal in WDM, an open eye indicates:
Answer: A
Explanation:
An open eye pattern indicates that the signal is not affected by noise, and the received signal is of high quality. This is because an open eye pattern is the result of a signal that is aligned in time, and is not affected by noise or other distortions.
Reference:
"Optical Fiber Communications" by Gerd Keiser
"Fiber-Optic Communications Technology" by Djafar K. Mynbaev
"Optical Communications" by Gerd Keiser
NEW QUESTION # 30
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