Chapter 9 Communications Circuits Frame AAcA。AcA 4-bit Address. 8-bit Charactor STDM STDM Figure 9-10 STDM tries to avoid having empty slots in a frame, thereby im proving the line use. If a terminal has no data to send in a particular time period, STDM will see if the next terminal has data that can be included in the time slot. When StDM at the receiving end breaks the frame apart, it uses the term inal address to route the data to the proper device. www.gxmu.edu.cnFigure 9-10 STDM tries to avoid having empty slots in a frame, thereby improving the line use. If a terminal has no data to send in a particular time period, STDM will see if the next terminal has data that can be included in the time slot. When STDM at the receiving end breaks the frame apart, it uses the terminal address to route the data to the proper device. www.gxmu.edu.cn Chapter 9 Communications Circuits