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Gain Tracking is the measurement of the linearity of the Encoding and Decoding processes. Using a reference level of –10 dBm0, a 1020 Hz signal is varied in level from +3 to –55 dBm0 and expected to remain within a particular tolerance envelope. This tolerance envelope is defined in ITU-T G.712 and, as an example, is +/- 0.5 dB from +3 to –40 dBm0 and +/- 3 dB at –55 dBm0.
