Functions of the VI and VO optical ports of the OAU board

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A VOA is configured between the two optical ports. A multiplexed signal is input through the VI port, processed for optical power adjustment, and then output through the VO port. Then the IN port receives the multiplexed signal sent through the VO port.

Other related questions:
Method used to connect the TDC and RDC optical ports of the OAU board
A DCM module can be connected between the two ports. If dispersion compensation is not required, the two ports can be directly connected using an optical fiber.

Split ratio calculation for the MON port of the OAU board on OSN 6800
The split ratio between the MON port and the OUT port is 1:99. In other words, the optical power of the MON port is 20 dB lower than that of the OUT port, which is calculated using the following formula: Pout (dBm) �?Pmon (dBm) = 10 x lg(99/1) = 20 dB.

Optical ports of an FIU board
An FIU board has a total of seven optical ports. The IN/OUT optical port is used to receive and transmit line optical signals. The RC/TC optical port is used to receive and transmit optical signals of the main optical channel. The RM/TM optical port is used to receive and transmit optical signals of the supervisory channel. The MON optical port is used to output optical signals to the spectrum analyzer board for online optical performance monitoring.

Optical ports of the OTU board
The OTU board provides two groups of optical ports: IN/OUT and Rx/Tx. The IN and OUT ports correspond to WDM-side input and output, and the Rx and Tx ports correspond to SDH-side input and output. The WDM side is also called the line side; the SDH side is also called the client side. In the alarm parameters, 1 indicates the WDM-side transceiver optical port, and 2 indicates the SDH-side transceiver optical port. In some documents, the optical ports of the OTU board are classified into system-side and line-side ports. In the early period, the system side is also called the client side.

Whether the VI port on the OBU board can report a LOS alarm
No, the VI port on the OBU board cannot report a LOS alarm. When logical fibers are created on the NMS, if no FIU board is configured at the local site and the multiplexed-wavelength optical signals of the peer site need to be connected to the OBU board at the local site, you are advised to connect the logical fiber to the IN port of the OBU board. In this way, the corresponding logical fiber will turn red in case of a fiber cut.

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