The multitone test signal (MTTS) consists of a spectrum of N discrete signals separated by frequency spacing of 100 Hz in the low frequency range. The spectral lines are all of equal amplitude; their phase relationship to each other is chosen on the basis of mathematical considerations so that the energy of the test signal is distributed approximately evenly across the entire period of the test signal. The transmission characteristics, i.e. the amplitude and phase distortion of a telephone line, produce changes in the test signal. On the receive side, these changes are measured and evaluated, e.g. by means of a Fourier analysis. The results may be displayed on a screen in the form of an amplitude andor phase graph and also, for example, the group delay may be derived from this.
ITU-T O.81 APP.1-1998由国际电信联盟 IX-ITU 发布于 1998-06-01。
ITU-T O.81 APP.1-1998 在中国标准分类中归属于: M40 电话通信设备。
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