In telecommunication, reference noise is the magnitude of circuit noise chosen as a reference for measurement.

Note: Many different levels with a number of different weightings are in current use, and care must be taken to ensure that the proper parameters are stated.

See also: dBa, dBa(F1A) , dBa(HA1) , dBa0 , dBm, dBm(psoph) , dBm0 , dBrn,dBrnC , dBrnC0 , [[dBrn(f₁-f₂)]], dBrn(144-line) , dBx .

Source: From Federal Standard 1037C and from MIL-STD-188