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The symbol dBrn or dB(rn) is an abbreviation for decibels above reference noise.. Weighted noise power in dB is referred to 1.0 picowatt.Thus, 0 dBrn = -90 dBm.Use of 144 line, 144-receiver, or C-message weighting, or flat weighting, can be indicated in parentheses.
In telecommunications, reference noise is the magnitude of circuit noise chosen as a reference for measurement.. 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.
Examples of electrical noise-level measurement units are dBu, dBm0, dBrn, dBrnC, and dBrn(f 1 − f 2), dBrn(144-line). Noise may also be characterized by its probability distribution and noise spectral density N 0 (f) in watts per hertz. A noise signal is typically considered as a linear addition to a useful information signal.
The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. Until the mid-1920s, the unit for loss was miles of standard cable (MSC). 1 MSC corresponded to the loss of power over one mile (approximately 1.6 km) of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to a ...
In telecommunications, the term channel noise level has the following meanings: . The ratio of the noise in the communication channel at any point in a transmission system to an arbitrary level chosen as a reference.
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In telecommunications, a transmission level point (TLP) is a test point in an electronic circuit that is typically a transmission channel.At the TLP, a test signal may be introduced or measured. [1]
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