Although a given waveform may contain frequencies over a very broad range， as a practical matter any transmission system will be able to accommodate only a limited band of（  ）.This， in turn，limits the data rate that can be carried on the transmission（  ）. A square wave has an infinite number of frequency components and hence an infinite （  ）.However， the peak amplitude of the kth frequency component， kf， is only 1/k， so most of the（  ）in this waveform is in the first few frequency components. In general， any digital waveform will have（  ）bandwidth. If we attempt to transmit this waveform as a signalover any medium， the transmission system will limit the bandwidth that can be transmitted.