“In analog world the standard test message is the sine wave, followed by the two-tone signal for more rigorous tests. The property being optimized is generally signal-to-noise ratio (SNR). Speech is interesting, but does not lend itself easily to mathematical analysis, or measurement.
ln digital world a binary sequence, with a known pattern of ‘ 1’ and ‘0’ , i s common . It i s more common to measure Bit error rates (BER) than SNR, and this is simplified by the fact that known binary sequences are easy to generate and reproduce. A common sequence is the pseudo random binary sequence.”
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“A PRBS (Pseudo Random Binary Sequence) is a binary PN (Pseudo-Noise) signal. The sequence of binary 1’s and 0’s exhibits certain randomness and auto-correlation properties.Bit-sequences like PRBS are used for testing transmission lines and transmission equipment because of their randomness properties.Simple bit-sequences are used to test the DC compatibility of transmission lines and transmission equipment.”
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Pseudo-Random-Bit-Sequence (PRBS) is used to simulate random data for transmission across the link.The different types of PRBS and the suggested data-rates for the different PRBS types are described in the ITU-T standards O.150, O.151, O.152 and O.153.In order to properly simulate real traffic, a pseudo-random bit sequence (PRBS) is also used. The rate of the PRBS can range between 2^-9 and 2^-31. Typically, for higher-bit-rate devices, a high-rate PBRS pattern is preferable so that the device under test is effectively stressed
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