We have N transmitters, and each is attempting to access N distinct receivers. Each station has two transmitters and two receivers. Subject to these constraints on the number of transmitters and receivers per station, any logical connection graph can be realized. Each node can tansmit and receive on two wavelengths. Each wavelength can support S bps.
Traffic is uniform.
You are to consider various designs and find the maximum throughput. Which network provides the maximum capacity per user. The re-circulating perfect shuffle network gives max. Only four wavelengths are possible on the optical medium. A node may have no more than four transmitters and receivers and all may operate in parallel.