Enhancing High-Speed Telecommunications Networks with FEC

Two future ITU specifications recommend FEC in transmission systems, ITU-T G.709 and ITU-T G.975. ITU-T G.709 defines the network node interface for the optical transport network operating at 2.5, 10 and 40 Gbps, and describes a "wrapper" approach that incorporates a simple framing structure and an FEC section. Specifically intended for use in optical fiber submarine cable systems, ITU-T G.975 recommends FEC in systems operating at 2.5 Gbps and higher. Both specifications use a Reed-Solomon encoder/decoder for FEC. This white paper describes the reasons for this choice and describes a practical implementation of FEC for ITU-T G.709 systems using Altera programmable logic devices (PLDs).

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