Description of the FEC, AFEC and super modules

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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.

Other related questions:
FEC, AFEC, and super modules
FEC and AFEC are different encoding formats. The difference between the super board and non-super board lies in modulation formats. The AFEC and super modules are designed for adding the transmission distance of WDM equipment without regeneration. The following combinations are available: Common FEC Common FEC + Super module AFEC AFEC +Super module Signals of different modulation formats can be interconnected, while signals of different encoding formats cannot be interconnected. That is, OTU boards with and without the super module can be interconnected, but OTU boards of the AFEC and FEC encoding formats cannot be interconnected.

Value of pre-FEC BER of the LWF board in FEC or AFEC mode on WDM 1600G devices that causes post-FEC BER
When the pre-FEC BER reaches 10E�?, the bit error handling will be initiated. The error correction threshold of Huawei WDM devices can reach around 10E�? for FEC which meets the G.975 protocol standards, and reach around 10E�? to 10E�? for AFEC.

Threshold of the pre-FEC BER that will trigger post-FEC bit errors on LWF boards using the FEC/AFEC function in BWS 1600G devices
When the pre-FEC BER reaches 10E-7, the system will start bit error processing. (The actual error correction limit of Huawei WDM devices can reach around 10E-5 for G.975-compliant FEC, and reach around 10E-3 to 10E-4 for AFEC.)

Interconnection and differences between FEC and AFEC on WDM equipment
AFEC is an enhanced forward error correction function, but FEC is a standard error correction function. The frame structures of the two functions are different and therefore cannot be interconnected.

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