Now, due to the need for new services, there are two waves at site B that need to be moved up and down, that is, the OLA site must be transformed into a back-to-back OTM site. Which of the following description is wrong?

A WDM network is shown in the figure.

Now, due to the need for new services, there are two waves at site B that need to be moved up and down, that is, the OLA site must be transformed into a back-to-back OTM site. Which of the following description is wrong?
A . Site type convert from OLA to back-to-back OTM requires to add boards such as M40/D40/OA/OU
B . It is necessary to evaluate whether the existing network sub-slot slots are sufficient. If new sub-shelves are required, it is necessary to evaluate whether there is space to install new sub-shelves.
C . Since the original network dispersion is normally compensated, it is not necessary to adjust the dispersion after network reconstruction.
D . Need to re-calculate the design SNR of each segment of A-B, B-E, A-E, and evaluate whether the designed SNR can meet the needs of business reception
E . Make an optical power budget for the new service relay segment, and the rebuilt site needs to redesign the power according to the requirements of the back-to-back OTM site. If possible, an optical amplifier board needs to be added.

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Answer: B