There are eight analog signals, each of bandwidth B=2kHz. Samples of these signals are time-division-multiplexed, quantized and binary-coded. The step size Δ of the quantizer cannot be greater than 0.5% of the peak amplitude mmax. Then the minimum number of quantization levels should be L= . The transmission bandwidth BT is if Nyquist criterion pulse with roll-off factor r=1/3 are used, where the sampling rates must be at least 50% above the Nyqusit sampling rate.