You have to design a network between 7 cities, (A thru F are arranged forming an hexagon and the seventh "G" is the center). Consider carefully the design restrictions because you have a limited number of components and the fiber distance is also a limitation.

• There will be an optical switch in each city that supports 4 ports. Each port is a pair of fibers, one for transmission and the other for reception.
• Each fiber supports 3 colors ( C1 to C3)
• Each switch can handle 12 independent connections ( 4 ports, 3 colors each)
• One port must be reserved for the traffic destination in the city, the remaining three are for long distance.
• The max distance for a fiber link with no amplifiers is 100 KM
• All distances between neighbor cities are 100 km (not the actual logic links or light-paths). Of course some cities will be at 200 km or more.
• There are only 4 EDFA available.
• Create a design that will allow at least four lightpath connections from each city to other 4 . (Only 3 fiber pairs allowed to terminate in a city but each fiber carries multiple colors)
• Remember that a lightpath only connects two cities at the end and cannot be shared with a third.
• Include the total cost of your solution for bonus 10 points:
  • The cost of a switch is $100K, an amplifier is $50K, 100km of fiber are $1M. (grating cost is not considered)

Provide:

1. Diagram of a switch design with a detailed structure that will be installed in each city. Consider the ports, wavelenghth split/merge into fibers, and fabric)
2. Map or diagram of city connections illustrating the physical fiber connectivity between switches (include the local port)
3. Color links between different cities (when they are not directly attached through a direct fiber, try to avoid interference)
4. IF you encounter a situation where it is impossible to establish a lightpath due to resource limit or blocking please explain clearly the reason.
5. -Turn in scanned procedure before deadline.

Answer rating: 100% (QA)

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