This attribute indicates the calculated bit error rate on the link. Test
data are generated and sent in frames of a preset size (frameSize).
The Test component tries to estimate the number of bit errors in any
errored frame which is identifiable. The statistics are updated
accordingly. A lost frame (possibly due to an error on the flag
sequence) is not used for the bit error rate calculation. The result is
presented in the form of xEsyy, where x is the mantissa; and syy is
the exponent, for example 0E+00, 2E-09.
Note that the bitErrorRate is an estimate only. For more reliable test
results, the test should be done over a long period. Multiple tests
would also improve the confidence level of the test results.
This attribute is not displayed for ATM cards because the physical
layer drops all errored frames at the controller interface.