AN 846: Intel® Stratix® 10 Forward Error Correction

ID 683805
Date 7/02/2018
Public
Document Table of Contents

5.5. Specifications

The IEEE802.3ap specification defines an insertion loss and return loss of 25 dB at 5.15625 GHz. The 1e-12 BER requirement is a system specification that is met with or without FEC.

The IEEE802.3bj specification specifies 100GBASE-KR4 for 100 Gbps operation using NRZ over four differential pairs where the insertion loss does not exceed 35 dB at 12.9 GHz. 100GBASE-KR4 uses:

  • The PCS defined in Clause 82
  • The RS-FEC defined in Clause 91
  • The PMA defined in Clause 83
  • The PMD defined in Clause 93

IEEE802.3bj also specifies 100GBASE-KP4 for 100 Gbps operation using PAM4 over two differential pairs where the insertion loss does not exceed 33 dB at 7 GHz. 100GBASE-KP4 uses:

  • The PCS defined in Clause 82
  • The RS-FEC defined in Clause 91
  • The PMA and PMD defined in Clause 94

The CEI 56G long reach (LR) specification discusses multiple FECs, but the standard is KP4 FEC with PAM4. The 1e-15 BER requirement is a system specification met with FEC.

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