18.104.22.168. KR FEC Blocks
The KR FEC blocks in the Enhanced PCS are designed in accordance with the 10G-KRFEC and 40G-KRFEC of the IEEE 802.3 specification. The KR FEC implements the Forward Error Correction (FEC) sublayer, a sublayer between the PCS and PMA sublayers.
Most data transmission systems, such as Ethernet, have minimum requirements for the bit error rate (BER). However, due to channel distortion or noise in the channel, the required BER may not be achievable. In these cases, adding a forward error control correction can improve the BER performance of the system.
The FEC sublayer is optional and can be bypassed. When used, it can provide additional margin to allow for variations in manufacturing and environmental conditions. FEC can achieve the following objectives: