Editing Network performance (section)

===Error rate===
{{Main|Bit error rate}}
In [[digital transmission]], the number of '''bit errors''' is the number of received [[bit]]s of a [[data stream]] over a [[communication channel]] that have been altered due to [[noise (telecommunications)|noise]], [[interference (communication)|interference]], [[distortion]] or [[bit synchronization]] errors.

The '''bit error rate''' or '''bit error ratio''' ('''BER''') is the number of bit errors divided by the total number of transferred bits during a studied time interval. BER is a unitless performance measure, often expressed as a [[percentage]].

The '''bit error probability''' ''p<sub>e</sub>'' is the [[expectation value]] of the BER. The BER can be considered as an approximate estimate of the bit error probability. This estimate is accurate for a long time interval and a high number of bit errors.