FEC encoding supported by Huawei WDM equipment


Huawei WDM products provide the forward error correction (FEC), high performance forward error correction (HFEC), soft-decision forward error correction (SDFEC), and advanced forward error correction (AFEC) functions on different OTU, tributary, and line boards.
The FEC, HFEC, SDFEC, and AFEC functions help decrease the OSNR requirements of the system at the receive end and extend the transmission distance between optical amplifier sections and regenerator sections. In addition, the FEC, HFEC, SDFEC, and AFEC functions help reduce bit error rate during line transmission and enhance the transmission quality of DWDM networks.
Note that boards that use different FEC modes cannot interconnect with each other.

Other related questions:
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.

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.

Types of supervisory channels supported by NG WDM equipment
The DCC channel bandwidth supported by NG WDM equipment is represented by the number of loadable 64 bytes. The following lists the DCC channels supported by NG WDM equipment and the bandwidth: D1-D3 3 bytes D4-D12 9 bytes GCC0 3 bytes GCC12_9 9 bytes GCC12_18 18 bytes Pilot-tone DCC Irrelevant to byte or bandwidth Note: 1. For the OTU boards whose WDM-side service type is SDH, the DCC channel type is D1-D3. Channels D4-D12 are not supported. 2. SC2/SC1 boards support two DCC channel types: D1-D3 and D4-D12. In normal situations, both DCC channel types can be used to transmit monitoring information. After ASON is enabled, D4-D12 can be used only as physical channels to transmit the ASON protocol. 3. For the OTU board of the OTN frame structure, three channel types are supported: GCC0, GCC12_9, and GCC12_18. For OTN boards with 2.5G rates, GCC0 and GCC12_9 are allocated. For OTN boards with 5G and 10G, GCC0 and GCC12_18 are allocated. The bandwidth provided by GCC0 is 3 bytes, which is the same as the bandwidth of D1-D3. It is the GCC0 byte in the OTUk overhead in the OTN frame structure. The bandwidth provided by GCC12_9 and GCC12_18 are 9 and 18 bytes respectively. They are the GCC1 and GCC2 bytes without various bandwidth in the ODUk overhead in the OTN frame structure. 4. Pilot-tone DCC is special. By coupling RF signals and service signals, pilot-tone DCC uses RF signals to carry monitoring information. Therefore, no byte or bandwidth is involved in pilot-tone DCC.

Dustproof requirements for WDM equipment
The operating environment requirements of WDM equipment must comply with IEC 60529 (Degrees of protection provided by enclosures).

Difference between conventional WDM equipment and OTN equipment
Both of them use the DWDM technology. The difference between them lies in that OTN equipment can achieve electrical cross-connection scheduling for various types of services.

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