Currently, 2Mbit/s signals are most widely used. Which of the following steps are involved in the process of multiplexing 2Mbit/s signals into STM-N? (Multiple choice)

• A.Join Pointer
• B.Scrambling
• C.Rate adaptation
• D.Add segment overhead

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Which of the following descriptions about the DWSS20 board is correct? (Multiple choice)

• A.For the pass-through service, only one pair of optical fibers needs to be connected in the two directions.
• B.Support the optical power query function of DM01~DM20, AM1~AM20 and IN/OUI optical ports on the network management system.
• C.It can realize the multiplexing and demultiplexing functions of coherent signals and non-coherent signals.
• D.It can realize the optical power adjustment function for each wavelength in the sending direction and receiving direction.

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The overhead ratio is a factor that affects the error correction capability of FEC technology. Generally, under the same FEC encoding/decoding algorithm conditions, the higher the overhead ratio, the greater the net coding gain

• A.False
• B.True

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Which of the following alarms can trigger the automatic switching of optical line protection? (Multiple choice)

• A.R_LOS
• B.IN_PWR_LOW
• C.POWER_DIFF_OVER
• D.MUT_LOS

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The manual reset at the equipment site is hard reset.

• A.True
• B.False

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