Channel noise level

In telecommunications, the term channel noise level has the following meanings:

1. The ratio of the noise in the communication channel at any point in a transmission system to an arbitrary level chosen as a reference.^[a][b]
2. The noise power spectral density in the frequency range of interest.
3. The average noise power in the frequency range of interest.

See also

• Ambient noise level

Notes

1. The channel noise level may be expressed in (a) dB above reference noise (dBrn), (b) dB above reference noise with C-message weighting (dBrnC), or (c) adjusted dB (dBa).
2. Each unit used to measure channel noise level reflects a circuit noise reading of a specialized instrument designed to account for different interference effects that occur under specified conditions.