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//Example 5.14, Page number 5.32
clc;clear;close
// variable declaration
P_i=100 // input
P_o=2 // output
L=10 // in km
// Calculations
S=(10/L)*log(P_i/P_o) // dB/km
O=S*L // dB
// Result
printf("a)Signal attention per unit length = %.1f dB-km^-1",S)
printf("\nb)Overall signal attenuation = %.f dB",O)
// Answer given in the textbook is wrong
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