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//Caption:Program to determine the distance limit imposed by the need to echo E bit in a BRI S/T interface
//Example 11.1
//Page 501
//Refer to figure 11.5 on page 500
disp('By seeing the figure, it can be seen that the minimum delay between a terminal transmitting D bit and receiving it back in the following E bit is seven bit times')
disp('At a 192 kbps data rate the duration of bit is 5.2 usec. Thus, the total round trip propagation time is ')
7*5.2//usec
disp('Assuming no appreciable circuitry delays in the NT,')
c=3*10^8// speed of light
Lmax=(36.4*10^-6)*(1/3)*c
disp('Because round trip propagation involves both direction of transmission')
Dmax=(1/2)*Lmax
disp("Result")
disp("Maximum length of wire(Lmax) = 3640 m = 3.64 km")
disp("Maximum distance(Dmax)= 1820 m = 1.82 km")
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