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| Section | Weight | Objectives |
|---|---|---|
| Network Survivability and Protection | 15% | - Path and line protection schemes - Availability and survivability concepts - Protection and restoration mechanisms |
| WDM Technology and Systems | 25% | - DWDM system architecture and building blocks - Wavelength Division Multiplexing concepts - Optical amplifiers and transmission engineering |
| Optical Networking Basics | 20% | - Optical components and functions - Fiber types, properties and transmission principles - Optical signal propagation and characteristics |
| Network Management and Operations | 20% | - Network commissioning and monitoring - NFM-T / WS-NOC management system overview - Network design with 1830 EPT / WaveSuite Planner - Performance monitoring, alarms and troubleshooting |
| Optical Network Architecture and Nodes | 20% | - Network topologies and transport architectures - WDM node types and functionalities - Switched WDM (SWDM) principles |
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10. Frage
Which statement is correct about node synchronization?
Antwort: B
Begründung:
Node synchronization is a process of keeping the NFM-T database in sync with the nodes in the network. The synchronization process will download all the items from the node, including NE parameters, ports, alarms, internal links, etc., to the NFM-T database. This ensures that the NFM-T database is up to date and the network is running efficiently.
11. Frage
In which window(s) does the attenuation reach its minimum peak?
Antwort: C
Begründung:
The third window (1550 nm) is where the attenuation reaches its minimum peak. This is because the materials used in fiber optic cables have minimal absorption in this wavelength range. The first and second windows (850 nm and 1300 nm respectively) have higher attenuation due to the materials used in the fiber optic cables.
12. Frage
Which of the following is NOT a troubleshooting functionality of the Wavelength Tracker?
Antwort: B
Begründung:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
The Nokia Wavelength Tracker is a unique and powerful technology used within the 1830 PSS portfolio to provide "layer 0" visibility. It works by embedding unique optical signatures (keys) onto each wavelength at the source (transponder). These signatures allow the system to identify and monitor individual channels as they traverse the optical network without the need for expensive Optical Spectrum Analyzers (OSAs) at every site.
Specifically, the Wavelength Tracker enables tracing a service along its path by identifying these unique keys at various monitoring points. It also excels at channel power monitoring, as it can measure the power level of each specific wavelength independently. Furthermore, it is instrumental in detecting unexpected or missing channels (ghost signals or misrouting) by comparing the detected keys against the expected provisioning data in the management system. However, it is not used for testing a node's internal fiber connectivity before service provisioning. Internal fiber connectivity is typically verified during the commissioning phase using the Commissioning and Power Balancing (CPB) tool within WS-NOC or through manual physical inspection and "fiber-it" procedures. Wavelength Tracker requires an active, keyed optical signal to function, which generally exists only during or after the service provisioning stage.
13. Frage
What is a degree-1 node?
Antwort: D
Begründung:
A degree-1 node is a node that only has one direction, and it is therefore a terminal node. This means that the node only has one input and one output port. It does not have any other ports to connect to other nodes or fibers. This is a common feature of some optical transport networks, such as ring networks, where a degree-1 node serves as the endpoint of the ring.
14. Frage
What is an optical switch?
Antwort: D
Begründung:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
In the context of optical networking fundamentals, an optical switch (often referred to as a Photonic Switch or Layer 0 switch) is defined as a device that routes an optical signal-composed of photons-from an input port to one or more output ports without converting it into an electrical signal. This process is known as transparent switching. It operates entirely within the optical domain, maintaining the integrity of the lightwave regardless of the data rate or protocol being carried (e.g., SDH, Ethernet, or OTN).
It is important to distinguish this from Option D, which describes an Electrical or ODU Switch (Layer 1). In a device like the Nokia 1830 PSS-24x, signals are converted to electrical format (O-E-O) to be switched at the ODU (Optical Data Unit) level via a central fabric. While this provides "any-to-any" grooming, a true optical switch (like a WSS found in ROADMs) simply steers the light. The primary advantage of an optical switch is its ability to handle massive amounts of bandwidth with extremely low latency and lower power consumption compared to electrical switching, as it avoids the overhead of repeated O-E-O conversions at intermediate network nodes.
15. Frage
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