BER · Bit-Error Rate
The fraction of transmitted bits received in error; a key quality metric for high-speed optical and copper links.
Current numbers
1e-12default fabric BER acceptance threshold per port (InfiniBand ibdiagnet)
100-200 Gb/sPAM4 SerDes per-lane rate driving 800G/1.6T links — FEC-mandatory, BER-screening-critical
≤1e-13post-FEC BER pass floor for AI fabric links (tightening toward 1e-13 at the highest lane rates)