Cause why TD20/TM20 boards are used at an ROADM site in a coherent system

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The OSN 8800 uses the frequency selection technology of coherent boards and works with ROADM boards such as TM20 and TD20 to implement the ROADM solution with a simple structure, greatly reducing the costs for constructing an optical-layer ASON network. For example, when the TN11TM201 and TN12TD201 boards are used, up to 20 colorless wavelengths can be added and dropped, greatly saving board and slot resources.

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