Before revision: In communication systems with very low uncorrected bit error rates, such as modern fiber optic transmission systems, or systems using large amounts of forward error correction, errored seconds are often a better measure of effective error rate than simple bit error rate.
After revision: with higher low-level error rates that are correctedIn communication systems with very low uncorrected bit error rates, such as modern fiber optic transmission systems, or systems using large amounts of forward error correction, errored seconds are often a better measure of effective error rate than simple bit error rate.