This counts the total number of bits received in error during this port's BERT session, likewise saturating at 0xFFFFFFFF rather than wrapping. Paired with pportBertBitCount for the same channel, this is the numerator you would use to compute an actual bit error rate for this specific test run, keeping in mind that on a severely degraded line this counter could itself saturate well before the bit count does. A pportBertErrorCount of 500 against a pportBertBitCount of 5 billion bits on this channel would indicate an extremely low, generally acceptable error rate for that test run.