Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 8

Consider an OBS system in which the processing and configuration times are both 1 ms. Similar to Fig. 13.37, suppose the burst goes between edge routers A and B through four intermediate OXCs and that all nodes are 10 km apart. If the OBS control packet is sent by A at time t = 0 and the propagation delay in an optical fiber is 5 µ s/km, calculate the following:
( a ) The offset time
( b ) The times at which the control packet will arrive at and leave from each intermediate OXC
( c ) The times at which the burst will arrive at each intermediate OXC.