04 Try it yourself Interactive

Step the sum, one substituted line at a time

The three tabs are the three scenarios worth knowing: an office LAN where transmission dominates, the Delhi to Chennai fibre path from section 02 where propagation dominates, and a geostationary satellite link where propagation swamps everything else combined. The middle tab reproduces section 02 exactly, line for line. Below the tabs, six settings you can change independently, so you can walk the numbers from one regime into the other and watch which term takes over. Every step prints the expression with the values substituted before it prints a result, so nothing here is a number you have to trust. Nothing plays on its own: Next, Back and Reset, or the arrow keys.

Delhi to Chennai fibre
seven givens, four delays
Processing is a fixed given of 0.020 ms per router throughout. Queuing is the only setting here that represents load rather than physics, which is the point of having it on its own control.
Press Next to begin. Each press works out one more line of the sum.


      

        
Transmission ms–

        
Propagation ms–

        
One way ms–

        
RTT ms–

      


      

      

        
        
        
        step 0 / 0