Description of the FEC, AFEC and super modules

Question:
Which are the descriptions of the FEC, AFEC, and super modules?
None
Answer:
FEC and AFEC are different encoding formats. The super board and non-super board distinguish in modulation formats. The AFEC and super modules are designed for increasing the transmission distance of the WDM device without a relay. Four combinations are used as follows:
1. Common FEC
2. Common FEC+super module
3. AFEC
4. AFEC+super module
Signals of different modulation formats can be interconnected. Signals of different encoding formats cannot be interconnected.
That is, the super module and non-super OTU boards can be interconnected, but an OTU board encoded in FEC mode cannot be interconnected to an OTU board encoded in AFEC mode.

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