Since 2018, in response to market changes, different main models of optical products have been launched. The correct switching order is (). (Multiple Choice)

Question

Options

• AOSN9800U16>OSN9800M24>E9624
• BOSNS80>OSN1800V>OSN1800VPro
• COSN2500>OSN1800V>OSN8800T16
• DOSN1800V>OSN1800VPro>E6616

• A
  83% (33)
• C
  18% (7)

Explanation

Options A, B, and D each trace a coherent, chronological product evolution within a single Huawei optical product family. A follows the high-capacity backbone OTN line (OSN9800U16 → OSN9800M24 → E9624), B traces the edge/access OTN line (OSN580 → OSN1800V → OSN1800VPro), and D continues the metro OTN evolution (OSN1800V → OSN1800VPro → E6616) - each reflecting Huawei's iterative response to growing bandwidth and integration demands since 2018.

Option C is wrong because it mixes incompatible product families: the OSN2500 belongs to a legacy SDH/OTN line, and the OSN8800T16 is a backbone-class platform - placing them in a sequence with the metro-class OSN1800V misrepresents the actual product roadmap and suggests a nonsensical cross-family transition.

Memory tip: Group each correct option by market tier - think "backbone (A), edge (B), metro (D)" - and verify that every product in the sequence belongs to the same family with each step representing a clear generational upgrade. If a sequence jumps between tiers (as C does with OSN2500 → OSN1800V → OSN8800T16), it is almost certainly wrong.

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