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+// Example 8.14.b //possible increase in link length
+clc;
+clear;
+close;
+mip=-10;//dBm
+mop=-25;//dBm
+tsm=mip-mop;//dB
+disp(tsm,"total system margin in dB is")
+l=2;//km
+fcl=3.2;//dB
+lfc=l*fcl;//fiber cable loss in dB
+sl=0.8;//dBm
+slc=sl*l;//dB
+cl=1.6;//dB
+sm=4;//dB
+tsm1=lfc+slc+cl+sm;//dB
+disp(tsm1,"total system margin in dB is")
+epm=tsm-tsm1;//dB
+ma=8;//dB
+l1=((-mop-cl-ma)/(fcl+sl));//km
+eil=l1-l;//
+disp(eil,"possible increase in length in km")