Precautions for commissioning multiplexed signals

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During optical power commissioning of a WDM network, you need to first commission the single-wavelength optical power and then the multiplexed-wavelength optical power. This rule ensures that the attenuation of multiplexed signals is the minimum. If you commission the multiplexed-wavelength optical power first, the attenuation of multiplexed signals may be excessively large and as a result the single-wavelength optical power may fail to be commissioned, causing a commissioning failure.

Other related questions:
Whether optical signals of the SC2 board are originated from multiplexed signals or received by the SC2 board
The OSC signals received by the SC2 board are sent from the laser of the peer SC2 board and then are split by the FIU board. They are not multiplexed signals.

Precautions for commissioning the TN12OBU1P board of OSN 8800
The working principle of the TN12OBU1P1 board is as follows: The attenuation of the built-in VOA before the IN port on the TN12OBU1P1 board cannot be manually adjusted. The board controls the input optical power. When the sum of the input optical power on the IN port plus 20 dB (gain) is greater than 7 or 9 dBm (maximum output power of the board, depending on the version), the board software automatically increases the attenuation of the built-in VOA to ensure that the output optical power is 7 or 9 dBm. When the sum of the input optical power on the IN port plus 20 dB (gain) is less than 7 or 9 dBm (maximum output power of the board, depending on the version), the board software adjusts the attenuation of the built-in VOA to the minimum value to obtain an output optical power value that is as high as possible. The TN12OBU1P1 board is a commissioning-free board. In addition, the input optical power of the board is not locked. Instead, the gain is locked to 20 dB for the board.

Whether the multiplexing from four ODU1 signals to one ODU2 signal is similar to the SDH multiplexing (both implemented in byte interleaved mode)
Yes. Both are implemented in byte interleaved mode.

What is Spatial Multiplexing
The MIMO technology provides the system with the spatial multiplexing gain and spatial diversity gain. In spatial multiplexing, multiple antennas are used on the received end and transmit end and multipath components in spatial communication is used, allowing signals to be transmitted over multiple data channels (MIMO sub-channels) in the same frequency band. This technology makes the channel capacity linearly increase with the growing number of antennas. This increase in channel capacity does not require additional bandwidth and does not consume additional transmit power. Therefore, spatial multiplexing is an efficient means to improve channel capacity and system capacity. In spatial multiplexing, serial-to-parallel conversion is performed on the transmitted signal to produce several parallel signal flows, which are then transmitted using their respective antennas in the same frequency band simultaneously. Due to the use of multipath propagation, each transmit antenna produces a unique spatial signal for the receive end. After the receive end receives the mixed signals of data, it differentiates these parallel data flows based on the fading between different spatial channels. Spatial multiplexing requires the spacing between transmit and receive antennas to be greater than the distance, ensuring that each sub-channel of the receive end is an independently fading channel.

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