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+// Example 8.6;//total channel loss
+clc;
+clear;
+close;
+afc=5;//attenuation in dB/km
+aj=2;//splice loss in dB/km
+l=5;//length in km
+ac=3;//dB
+ac1=4.5;//dB
+cl=(afc+aj)*l+ac+ac1;//dB
+disp(cl,"tota channel loss in dB is")