The bit error ratio (BER) is defined as the probability that a bit is received in error when, between transmission and reception, one or more bits are changed (e.g., a binary 0 is transmitted and a binary 1 is received).
This measured ratio is affected by many factors, including noise, interference, distortion, attenuation, and jitter. Depending on the telecommunication protocol, BER requirements might vary from 1×10-6 to 1×10-12.
