Chapter 9 Communications Circuits 面 7 FDM LILT Figure 9-8 FDM channels have full time use of a limited range of frequencies. TDM channels can use the full range of frequencies, but only during predetermined time slots www.gxmu.edu.cnFigure 9-8 FDM channels have full time use of a limited range of frequencies. TDM channels can use the full range of frequencies, but only during predetermined time slots. www.gxmu.edu.cn Chapter 9 Communications Circuits