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+//Example 12.2: link length and bandwidth
+clc;
+clear;
+close;
+format('v',4)
+disp("part (a)")
+af=3;//dB/km
+ac=0.5;//dB/splice
+nc=1;//
+lc=1;//dB
+ncc=1.5;//
+plx=0;//dBm
+prx=-25;//dBm
+Ms=7;//dB
+L=((plx-prx-Ms-(lc*ncc))/(af+ac));//
+TTX=12;//NS
+TRX=11;//NS
+NS1=3;//NS/KM
+NS2=1;//NS/KM
+tmat=(NS1*L);//ns
+tint=(NS2*L);//ns
+tsys=sqrt((TTX^2+tmat^2+tint^2+TRX^2));//ns
+disp(L,"maximum possible link length in km is")
+format('v',3)
+disp("part (b)")
+af=3;//dB/km
+ac=0.5;//dB/splice
+nc=1;//
+lc=1;//dB
+ncc=1.5;//
+plx=-0;//dBm
+prx=-25;//dBm
+Ms=7;//dB
+L=((plx-prx-Ms-(lc*ncc))/(af+ac));//
+TTX=1;//NS
+TRX=5;//NS
+NS1=9;//NS/KM
+NS2=2;//NS/KM
+tf=((NS1*L)^2+(NS2*L)^2);//
+tsys=sqrt((TTX^2+tf+TRX^2));//ns
+df=0.35/(tsys*10^-3);//
+disp(round(df),"system bandwidth in MHz iz")