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+//Optical Fiber communication by A selvarajan
+//example 10.2
+//OS=Windows XP sp3
+//Scilab version 5.5.1
+clc;
+clear all;
+PB=40//power budget in dB
+x=-30//crosstalk in dB assumed
+N=4//no. of switches 
+Lin=1//insertion loss of in dB
+Linw=Lin*N//worst case insertion loss of in dB
+Lc=2//worst case connector loss in dB
+L=Linw+2*Lc//total power lost in the worst case signal path in dB
+Power_margin=PB-L//power margin in dB
+K=0;
+for i=1:N
+K=K+(((-1)^(i+1))*(10^(-x/10))^i);
+end
+SbyN=10*log10(K)//Signal power to noise power in dB
+mprintf('Signal power to noise power =%fdB',SbyN)
+mprintf('\nPower Margin =%fdB',Power_margin)//The Textbook answer is wrong