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+// Example 7.42
+// Calculation of a)excess loss,b)insertion loss,c)crosstalk and d)split ratio for the device.
+// Page no 497
+
+clc;
+clear;
+close;
+
+//Given data
+P1=100*10^-6;                 // Power launched in port 1
+P2=0.005*10^-6;              // Power launched in port 2
+P3=30*10^-6;                // Power launched in port 3 
+P4=35*10^-6;              // Power launched in port 4
+
+// a)Excess loss
+E=10*log10(P1/(P3+P4)); 
+// b)Insertion loss
+I1=10*log10(P1/P3);
+I2=10*log10(P1/P4);
+
+//c)Crosstalk
+C=10*log10(P2/P1);
+
+//d)Split ratio
+S=(P3/(P3+P4))*100;
+
+
+//Displaying results in the command window            
+printf("\n Excess loss(in dB) = %0.2f  ",E);
+printf("\n Insertion loss(in dB) = %0.3f  ",I1);
+printf("\n Insertion loss (in dB)= %0.2f  ",I2);
+printf("\n Crosstalk (in dB)= %0.1f  ",C);
+printf("\n Split ratio(in percentage) = %0.2f  ",S);
+// The cross talk answer computation is wrong in the book