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+clc;

+//page no 778

+//prob no. 20.4.6

+//A multimode step index fiber

+del_t=4;B=10;

+//a)Determination of BW distance product

+BDP=1/(2*del_t);

+disp('Mbps-km',BDP,'a)The BW distance product for fiber is');

+//b)Determiation of dispersion limited length

+z_max_disp=BDP/(B*10^-3);

+disp('km',z_max_disp,'b)The disp limited length for a fiber is');