【71-75】although a given waveform may contain frequencies over a very broad range， as a practicalmatterany transmission system will be able to accommodate only a limited band of （71）. this，inturn，limits the data rate that can be carried on the transmission （72）. a square wave hasaninfinitenumber of frequency components and hence an infinite （73） .however， the peak amplitudeofthekth frequency component， kf， is only 1/k， so most of the （74）in this waveformisinthefirst few frequency components. in general， any digital waveform will have （75）bandwidth.ifwe attempt to transmit this waveform as a signal over any medium， the transmission systemwilllimitthe bandwidth that can be transmitted.
