# TIA's Glossary of Telecommunication Terms

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## bit error ratio (BER)

The number of erroneous bits divided by the total number of bits transmitted, received, or processed over some stipulated period. (188) *Note 1:* Examples of bit error ratio are (a) transmission BER, *i.e.,* the number of erroneous bits received divided by the total number of bits transmitted; and (b) information BER, *i.e.,* the number of erroneous decoded (corrected) bits divided by the total number of decoded (corrected) bits. *Note 2:* The BER is usually expressed as a coefficient and a power of 10; for example, 2.5 erroneous bits out of 100,000 bits transmitted would be 2.5 out of 10^{5} or 2.5 × 10^{-5}.

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