Functions of spectrum analyzer units MCA and WMU on OSN 6800

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?
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.

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