WMU board configuration

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The WMU board implements centralized monitoring on the fixed wavelengths of the transmit-end OTU board in a system with a channel spacing of 50 GHz or 100 GHz. The board can monitor two multi-wavelength signals. Generally, its IN1 and IN2 ports are connected to the MON ports of OA/FIU/ITL boards in the two directions.

Other related questions:
Fiber connections on the optical ports of the WMU board
The IN1 and IN2 optical ports on the WMU board separately connect to the MON port on two OA or FIU/ITL boards configured in two different transmit directions for centralized wavelength monitoring.

Functions of spectrum analyzer units MCA and WMU on OSN 6800
Question: When an OSN 6800 device is used to construct a new network, two spectrum analysis units are configured: multi-channel spectrum analyzer unit (MCA) and wavelength monitoring unit (WMU). The functions of these two boards seem to be overlapped. How do we understand these functions? Answer: 1. MCA boards are classified into MCA4 and MCA8, which provide four and eight ports respectively. An MCA board is mainly used to detect channel optical power, center wavelengths, OSNR, and the number of wavelengths on an optical path. Similar to an optical spectrum analyzer, an MCA board reports the detected information to the system control board for fault diagnosis and monitoring. It can also be used together with other boards to achieve the automatic power equilibrium (APE) function. 2. A WMU board works with the system control board to lock wavelengths and monitor the transmit-end OTU wavelength deviation. The monitoring results are transmitted to the system control board through mailbox. Then, based on the wavelength configuration table, the system control board determines whether wavelengths need to be adjusted. If the wavelengths need to be adjusted, the system control board transmits the adjustment information to the OTU board to complete the wavelength deviation adjustment. 3. An MCA board can be configured to monitor the transmit end and receive end.4. A WMU board can be configured only at the transmit end, because it is used to adjust wavelength deviation of the OTU board at the local station with the system control board. 5. An MCA board is easy to maintain. A WMU board provides functions. To use OTU boards with 100 GHz spacing in an 80-channel system in the C band, WMU boards need to be configured to lock the working wavelength of OTU boards. If the working length stability of OTU boards with 100 GHz spacing cannot meet the requirements of an 80-channel system, WMU boards can be used. Suggestion and conclusion: An MCA board is used to monitor optical signals. A WMU board is used to monitor optical signals and lock and control the OTU wavelength with the system control board.

Whether manual configuration is required for the WMU board to implement wavelength locking
The wavelength locking function is achieved after the centralized wavelength monitoring function is configured on the WMU board. When configuring the wavelength monitoring function, you need to understand the transmission direction and fiber connections of each OTU board, and check which optical port of the WMU board is connected. Currently, the following wavelength locking modes are supported: If the OTU, WMU, and optical-layer boards are configured on the same NE and you configure logical fiber connections, wavelength locking can be automatically performed without any operation. If the OTU and WMU boards are configured on the same NE but optical-layer boards are configured on another NE, you need to configure the mapping between the OTU board and the WMU board. If the OTU and WMU boards are configured on different NEs, ensure that the two NEs are in the same optical NE and you need to configure the mapping between the OTU board and the WMU board. Before the configuration, ensure that the DCN communication between NEs is normal.

Threshold of the input optical power of a WMU board in the OSN 6800
For the WMU board in the OSN 6800, its single-wavelength input optical power must be in the range of �?6 dBm to �?6 dBm.

Excessively large wavelength deviation reported by the WMU boards of OSN 6800
Question: The LSX boards with adjustable DRZ reported the WAVE_LEN_OVER alarm, whereas the ones with NRZ fixed wavelengths did not report the alarm. When an optical spectrum analyzer was used for wavelength testing, the wavelength deviations are within the allowed range. No excessively large wavelength deviation is detected. (OSN 6800 NE version 5.51.3.25, NMS version T2000V2R6) Root cause: None Answer. The wavelengths from the light source of the DRZ adjustable optical modules are controlled by the core temperature without human interference. Wavelength deviation adjustment should not be performed by the software to such modules. V100R003C02B028 does not monitor adjustable optical modules for wavelength deviation, and the deviation threshold was changed from 0.5 GHz to 5 GHz.

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