Reason why the OBU1P1 board in the PID system for OptiX OSN 8800 can be used to achieve commissioning-free

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In the PID system, the OBU1P1 board is configured at the receive end of a site and can automatically adjust EVOAs to ensure that the output optical power satisfies requirements, therefore achieving commissioning-free.

Other related questions:
Principles for configuring the OBU1P1 boards in the PID system for OptiX OSN 8800
When TN55NPO2 boards comprise a 120G PID group, OBU1P1 boards need to be configured based on the line loss if the transmission distance is less than 40 km. If the line loss is less than or equal to 11 dB, no OBU1P1 board needs to be configured. OBU1P1 boards need to be configured at the receive site when the line loss is greater than 11 dB but less than or equal to 20 dB. When the transmission distance is greater than 40 km but less than 80 km, OBU1P1 boards need to be configured at the receive site when the line loss is greater than 9 dB but less than or equal to 20 dB. When TN55NPO2E boards comprise a 200G PID group, OBU1P1 boards need to be configured based on the line loss if the transmission distance is less than 40 km. If the line loss is less than or equal to 9 dB, no OBU1P1 board needs to be configured. OBU1P1 boards need to be configured at the receive site when the line loss is greater than 9 dB. When the transmission distance is greater than 40 km but less than 80 km, OBU1P1 boards need to be configured at the receive site when the line loss is greater than 9 dB but less than or equal to 20 dB.

Reason why the cross-connect board must be TN16UXCM when the TTX board is used in an OptiX OSN 8800 T16 subrack
The TTX board processes 10 x 10G signals and therefore requires a 100 Gbit/s cross-connect capacity on the backplane. An OptiX OSN 8800 T16 subrack supports the 100 Gbit/s cross-connect capacity in a single slot only when the TN16UXCM board is configured as the cross-connect board.

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.

Reason why optical power cannot be queried on TN13FIU in the OptiX OSN 8800
The TN13FIU board does not support optical power detection, while TN11FIU and TN12FIU support.

Whether the 53ND2 board can substitute for the 12ND2 board on OptiX OSN 8800
The 53ND2 board can substitute for the 12ND2 board but cannot substitute for the 11ND2 board.

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