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+// Example 8.49
+// Calculation of viability of digital link.
+// Page no 503
+
+clc;
+clear;
+close;
+
+//Given data
+M=-10;                      // Mean optical power
+S=-41;                      // Receiver sensitivity
+TS=18.2;                    // Total system margin
+SP=3;                       // Split loss
+C=1.5;                     // Connector loss
+SM=6;                       // Safety margin
+
+
+// Net margin between LED and receiver
+N=M-S;  
+
+// Total system loss
+T=TS+SP+C+SM;
+// Excess power margin
+E=N-T;
+
+
+
+
+//Displaying results in the command window            
+printf("\n Excess power margin(in dB) = %0.1f  ",E);
+
+
+// The answers vary due to round off error