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| | Telecom Dictionary N: Phone Service Definitions |
 | | The bandwidth so calculated is considered to be the minimum necessary to convey information at the desired rate with the desired accuracy. |
 | | At a given data - signaling rate or modulation frequency, operating wavelength, and effective noise bandwidth, the radiant power that produces a signal-to-noise ratio of unity at the output of a given optical detector. |
 | | It is determined by (a) measuring (determining) the ratio, usually expressed in dB, of the thermal noise power at the output, to that at the input, and (b) subtracting from that result, the gain, in dB, of the system. |
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