Labels:book | earth | hakham | plant | plaything | reckoner | sea | sky | windowpane OCR: LANS AND WLANS 2 5 3 What kind of signals travel over computer networks? When FIGURE 5-9 data is transmitted over network link it usually takes the form of an elec- Digital and Analog Waves tromagnetic signal. You can think of these signals as waves that ripple The signals carried on digital through cables or through the air. Digital signals are transmitted as bits channel are depicted as stepped using limited set of frequencies. Analog signals can assume any value wave within specified range of I frequencies. Figure 5-9 helps you visualize the difference between digital and analog waves How can network detect if a signal has been corrupted? Digital networks -those that transmit digital signals- -can be easily moni- tored to determine interference has corrupted any signals At its most prim ...
