If so, this fault is typically caused by high insertion loss of the connector or the bending of the optical fiber. Bit Error Rate (BER) is a measure of signal integrity in data transmission systems, typically defined as the average ratio of the number of erroneously received bits to the total number of bits transmitted. Check for common connection problems, such as link failures or modules not recognized. If the fault persists, replace the optical module to check whether the fault is caused by the. Facing packet loss and RX drops issue on my Mikrotik x86 with 10G NIC, my current traffic is over 2200 Mbps. The channel insertion loss consists of the specified cable loss for each operating distance, splice losses and the loss of two connections.