- Industry: Telecommunications
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The nomenclature for the line rate of the optical transmission signal.
Industry:Telecommunications
The noise temperature referred to the output of the receiving antenna of the Earth station corresponding to the radio-frequency noise power which produces the total observed noise at the output of the satellite link excluding noise due to interference coming from satellite links using other satellites and from terrestrial systems.
Industry:Telecommunications
The noise power, usually relative to a reference. Note: Noise level is usually measured in dB for relative power or picowatts for absolute power. A suffix is added to denote a particular reference base or specific qualities of the measurement. Examples of noise-level measurement units are dBa, dBa (F1A,) dBa (HA1,) dBa0, dBm, dBm (psoph,) dBm0, dBm0P, dBrn, dBrnC, dBrn (f1-f2,) dBrn (144-line,) pW, pWp, and pWp0.
Industry:Telecommunications
The noise power in a bandwidth of 1 Hz, i.e., the noise power per hertz at a point in a noise spectrum. Note: The noise-power density of the internal noise that is contributed by a receiving system to an incoming signal is expressed as the product of Boltzmann's constant, k, and the equivalent noise temperature, Tn. Thus, the noise-power density is often expressed simply as kT. Synonym kT.
Industry:Telecommunications
The noise level resulting from undesired variations of a carrier in the absence of any intended modulation. Synonym residual modulation.
Industry:Telecommunications
The noise generated by thermal agitation of electrons in a conductor. The noise power, P, in watts, is given by P = kTf, where k is Boltzmann's constant in joules per kelvin, T is the conductor temperature in kelvins, and f is the bandwidth in hertz. Note 1: Thermal noise power, per hertz, is equal throughout the frequency spectrum, depending only on k and T. Note 2: For the general case, the above definition may be held to apply to charge carriers in any type of conducting medium. Synonym Johnson noise.
Industry:Telecommunications
The noise generated by thermal agitation of electrons in a conductor. The noise power, P, in watts, is given by P = kTf, where k is Boltzmann's constant in joules per kelvin, T is the conductor temperature in kelvins, and f is the bandwidth in hertz. Note 1: Thermal noise power, per hertz, is equal throughout the frequency spectrum, depending only on k and T. Note 2: For the general case, the above definition may be held to apply to charge carriers in any type of conducting medium. Synonym Johnson noise.
Industry:Telecommunications
The minimum value of a signal that can be detected by the system or sensor under consideration. 2. A value used to denote predetermined levels, such as those pertaining to volume of message storage, i.e., in-transit storage or queue storage, used in a message switching center. 3. The minimum value of the parameter used to activate a device. 4. The minimum value a stimulus may have to create a desired effect.
Industry:Telecommunications
The noise contributed by one or both loops of a telephone circuit to the total circuit noise. Note: In a given case, it should be stated whether the loop noise is for one or both loops.
Industry:Telecommunications
The noise caused by random fluctuations in the motion of charge carriers in a conductor. Note: There is often a minor inconsistency in referring to shot noise in an optical system: many authors refer to shot noise loosely when speaking of the mean square shot noise current (amperes2) rather than noise power (watts. )
Industry:Telecommunications
