This read-only object reports, in bits per second up to 20 Mbps, the bit rate detected on the line during the BERT test, which per the desc may not be available until the test completes. It gives the admin a measured throughput figure for the line under test conditions, useful for comparing against the line's provisioned or expected sync rate. For example, an admin seeing a much lower cXdslTestBertBitRate than the line's normal provisioned rate would suspect a line-quality problem limiting achievable throughput.