Method used to query the flow and direction of a wavelength signal on an NE

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You can query the logical fiber connections between optical NEs in the main view of the U2000.
On the main topology of the U2000, double-click the desired optical NE to display the status diagrams of the NE.
Select the signal flow diagram. Then you can query the logical fiber connections between boards of the optical NE.

Other related questions:
Method used to query intra-NE fiber connections on the NMS
You can query the logical fiber connections between optical NEs in the main view of the U2000. On the main topology of the U2000, double-click the desired optical NE to display the status diagrams of the NE. Select the signal flow diagram. Then you can query the logical fiber connections between boards of the optical NE.

Signal flow on an RDU9 board
After optical signals enter the IN port of the RDU9 board, they are split based on power by an optical splitter. Then, one multiplexed signal is output by the EXPO port of the board and the other one is output by the TOA port. The TOA port can be connected to an OA unit. If cascading is not required, the optical signal can be directly input to the ROA port of the RDU board. After the optical signal enters the ROA port, it is evenly split by an optical splitter. The split signals are then output by ports DM1 to DM8 of the RDU board.

Methods for checking the wavelength on LWFS boards.
You can run the cfg-get-wavelength command to check the wavelength.

Signal flow on the OAU1 board
One multiplexed optical signal received through the IN port is sent to the EDFA optical module. The EDFA optical module amplifies the optical power of the signal and locks the gain of the signal. The signal is added to the DCM board through the TDC port for color dispersion compensation. Then the signal is sent to the RDC port. At last, the amplified multiplexed signal is output through the OUT port. A multiplexed signal can be also input through the VI port, processed for optical power adjustment, and output through the VO port. Then the IN port receives the multiplexed signal sent through the VO port.

Wavelength spacing for 200G signals
For 10 Gbit/s, 40 Gbit/s, and 100 Gbit/s signals, the wavelength spacing is 50 GHz for an 80-wavelength system and 100 GHz for a 40-wavelength system. For 200 Gbit/s signals, the flexible grid technology can be used. When the technology is used, wavelength bandwidth is flexible, instead of being fixed at 50 GHz or 100 GHz. For example, if different modulation methods are used for 200 Gbit/s signals, different required bandwidth is required. (For example, it can be 75 GHz or 150 GHz). Flexible ROADM adjusts bandwidth based on signals and grooms the signals to specified directions according to the network configurations.

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