DWSS20 Board: Does It Support 20-Degree Optical Grooming?
Short answer
A The DWSS20 is a 20-degree wavelength selective switching board, so it supports grooming of 20-degree optical signals; the optional AM/DM port license only unlocks more ports, so mark TRUE.
Question
Key Takeaways
This question tests whether you can separate the DWSS20's 20-degree WSS grooming role from the default 10 AM/10 DM port entitlement, the main trap being to treat a license-limited port count as a board-degree limit.
The DWSS20 is a 20-degree wavelength selective switching board used for optical-layer grooming in NG WDM nodes. This page confirms the statement is TRUE (A) and explains why default AM/DM port licensing does not change the board's degree capability.
Common mistake: Answering FALSE because a TN52DWSS20 uses only 10 AM and 10 DM ports by default; that is a licensing limit on usable ports, not a limit on the board's 20-degree grooming capability.
Expert Analysis
What DWSS20 is in the path
The scenario asks about a board-level capability, not about a service that must first be provisioned. In an NG WDM node, the DWSS20 is a wavelength selective switching (WSS) board. Its role in the optical-layer grooming path is to receive wavelengths from the node's line directions, select or route them by wavelength, and pass them to the intended degree or add/drop port. The "20" in DWSS20 denotes the 20-degree WSS capability, so the board is intended to groom optical signals across 20 degrees. That makes the statement true; option A is correct.
Where the license changes the answer
A supplied comment makes the important distinction. It describes DWSS20 as a WSS board used to implement wavelength grooming at DWDM nodes, then notes that on a TN52DWSS20 only 10 AM ports and 10 DM ports are usable by default; to use the remaining 10 AM and 10 DM ports, you must configure a DWSS20 port license. This is a capacity/entitlement limit. It affects how many ports can be used in a given deployment, not whether the board type supports 20-degree grooming. If the question had asked "How many AM/DM ports are available without a license?" the answer would be 10 AM and 10 DM, not 20. But the question asks about grooming capability, so the license note does not make the statement false.
Why option B is not chosen
Option B, FALSE, is the trap for readers who see the default 10 AM/10 DM figure and equate it with a 10-degree limit. The request path in the board still has 20-degree WSS grooming; the license gates the additional ports. Therefore, the correct verdict remains A: the DWSS20 supports grooming of 20-degree optical signals.
Exam Strategy
For Huawei WDM board capability questions, separate hardware degree or role from software license limits. Identify the board family (DWSS = wavelength selective switch) and the meaning of its numeric suffix (20 = 20-degree) before judging a TRUE/FALSE statement. If a comment or exhibit mentions default port counts or licenses, ask whether that restricts feature availability or merely capacity; capability statements usually remain true. This technique prevents choosing FALSE for a board that is licensed for fewer ports than it can physically support.
Frequently Asked Questions
Does the DWSS20 support 20-degree optical-signal grooming without a license?
Why is the default 10 AM/10 DM port limit not a reason to answer FALSE?
Community Votes
100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 1 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 1
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ethassan 👍 1 Answered ATrue, As a type of wavelength selective switching board, the DWSS20 board is used to implement wavelength grooming at the nodes in the DWDM network. By default, only 10 AM ports and 10 DM ports of a TN52DWSS20 board can be used. To use the remaining 10 AM ports and 10 DM ports, you must configure one DWSS20 port license
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