Circuit noise level: At any point in a transmission system, the ratio of the circuitnoise at that point to an arbitrary level chosen as a reference.
Note: The circuit noise level is usually expressed in dBrn0, signifying the reading of a circuit noise meter, or in dBa0, signifying circuit noise meter reading adjusted to represent an interfering effect under specified conditions.
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The ratio of the channel noise at any point in a transmission system to an arbitrary level chosen as a reference.
Note 1: The channel noiselevel 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).
Note 2: Each unit used to measure channel noiselevel reflects a circuitnoise reading of a specialized instrument designed to account for different interference effects that occur under specified conditions.
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