Adjacent channel isolation for the D40 board

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For the D40 board, the adjacent channel isolation should be greater than 25 dB.

Other related questions:
Adjacent channel isolation for the M40 board
For the M40 board, the adjacent channel isolation should be greater than 22 dB.

Cause why the attenuation of the EVOA on a non-service channel of the M40V board connected to the D40 board is set to the maximum in the dummy light scenario
This setting ensures that the receive optical power is small to prevent a sharp optical power change on adjacent service channels.

FIU board isolation
Isolation refers to the ratio of the optical power leaked by local-frequency or RF signals to the input optical power, in the unit of dB. Isolation of a frequency mixer refers to the mutual isolation between frequency ports, including the isolation among local frequency, IF, and RF.

Whether the spacing specifications for adjacent channels refer to the specifications on fibers or in vacuum
The spacing specifications for adjacent channels refer to the specifications on fibers.

What is a fractional channelized board
Currently, the fractional channelized board refers to the 1E1T1-F/2E1T1-F/4E1T1-F/8E1T1-F board. The 1E1T1-F/2E1T1-F/4E1T1-F/8E1T1-F board line contains 32 timeslots that are numbered from 0 to 31. In fractional channelized mode, timeslot 0 is used to transmit synchronous information, and other timeslots can be bundled into a channel set.

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