Why the Bit Error Rate is a key concept of the Service Level Agreement?
In telecommunication, an error ratio is the ratio of the number of bits, elements, characters, or blocks incorrectly received to the total number of bits, elements, characters, or blocks sent during a specified time interval. The error ratio is usually expressed in scientific notation; for example, 2.5 erroneous bits out of 100,000 bits transmitted would be 2.5 out of 105 or 2.5 × 10-5. The most commonly encountered ratio is the bit error ratio (BER). For a given communication system, the bit error ratio will be affected by both the data transmission rate and the signal power margin. The BER is an indication of how often a packet or other data unit has to be retransmitted because of an error.
