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We report on experimental realization of the high fidelity of electric pulses passing through normal or anomalous dispersive cascaded electronic circuit systems (CECSs). It is found that the positive or negative group delay can be regarded as a good concept to describe the evolution of electric pulses as long as the fidelity of the output electric pulses is high. Here we systematically demonstrate that the fidelity changes in both normal and anomalous dispersive CECSs strongly depend on the different truncations or pulse shapes encoded in electric signals. Our experiment confirms that before a critical number of cascaded circuits, the pulse fidelity is high initially and changes slowly, however it suffers an exponential decrease beyond that critical number. For a certain electric input pulse, this critical number in normal dispersive CECSs is usually much larger than that in anomalous dispersive CECSs. For a fixed CECS, the weaker the input pulse is truncated, the larger the critical number is. Our results may be useful to the potential applications of positive or negative group delay in designing electronic circuit systems to compensate group delay. Keywords: Group delay, Cascaded electronic circuit systems, Anomalous and normal dispersion, Fidelity, Electric pulses