Before performing optical power commissioning on the ROADM board, configure virtual optical layer services; otherwise, the ROADM board blocks all wavelengths by default.

Question

Options

• ATrue
• BFalse

• A
  73% (16)
• B
  27% (6)

Explanation

Option A is correct because ROADM (Reconfigurable Optical Add-Drop Multiplexer) boards are designed with a default block-all behavior as a safety mechanism - without a configured virtual optical layer (VOL) service defining which wavelengths to pass, the board treats every wavelength as unauthorized and blocks it entirely. This means attempting optical power commissioning before VOL service configuration is pointless: there are no wavelengths propagating for the system to measure or adjust. The virtual optical layer service essentially acts as the permission framework that tells the ROADM which wavelengths are legitimate and should be allowed through.

Option B is wrong because it implies commissioning can proceed without this prerequisite, which contradicts ROADM's fundamental default-deny design - skipping VOL configuration would result in commissioning failures or inaccurate readings since the optical path is fully blocked.

Memory tip: Think of a ROADM like a firewall - its default rule is "deny all." You must first write the allow rules (virtual optical layer services) before traffic (wavelengths) can flow, and only then can you tune the power levels on what's actually passing through.

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