 Although it is theoretically possible for a random data pattern to align with the scrambler state and produce a long run of 65 zeroes or 65 ones, the probability of such an event is equal to flipping a fair coin and having it come up in the same state 64 times in a row.At 10 Gigabits per second, the expected event rate of a 66-bit block with a 65-bit run-length, assuming random data, is 66×264÷1010÷2 seconds, or about once every 1900 years.The run length statistics may get worse if the data consists of specifically chosen patterns, instead of being random.