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New forward error correction specification lowers total physical layer latency for engineered network links.

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Vincent

INTERNET BUSINESS NEWS-(C)1995-2019 M2 COMMUNICATIONS

The 25 Gigabit Ethernet Consortium, established to develop 25 Gbps and faster Ethernet specifications, has announced the availability of a low-latency forward error correction (FEC) specification for 50 Gbps, 100 Gbps and 200 Gbps Ethernet networks, the company said.

High latency is a problem for performance-critical networks in applications such as high-performance computing (HPC), data center interconnect, machine learning, financial trading and others. The availability of a low-latency FEC allows high-speed Ethernet to be better suited for these applications, especially for HPC networks where other interconnect technologies are more prominent than Ethernet.

FEC is a major source of latency in a switched network and the new specification cuts FEC latency approximately in half. This will have a significant impact on overall physical layer latency, in particular for hyperscale datacenter networks comprised of a large number of nodes, with multiple hops between servers.

The specification allows NEMs to optionally use a shortened codeword FEC variant -- RS (272, 257+1, 7, 10) that...

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