This problem illustrates some of the difficulties facing network planners when they have to use OADMs that are constrained in what channels they can add and drop. Consider a four-node linear network with nodes A, B, C, and D in that order. We have three wavelengths lambda-1, lambda-2, and lambda-3 available. The OADMs given to us can drop two fixed channels i.e., we can put OADMs that drop either (lambda-1, lambda-2), or (lambda-2, lambda-3), or (lambda-1, lambda-3). Now consider the situation where we need to set up the following light paths – AB, BC, CD, AC, and BD.
Computer Science
This problem illustrates some of the difficulties facing network planners when they have to use OADMs that are constrained in what channels they can add and drop.
Consider a four-node linear network with nodes A, B, C, and D in that order. We have three wavelengths lambda-1, lambda-2, and lambda-3 available. The OADMs given to us can drop two fixed channels i.e., we can put OADMs that drop either (lambda-1, lambda-2), or (lambda-2, lambda-3), or (lambda-1, lambda-3). Now consider the situation where we need to set up the following light paths – AB, BC, CD, AC, and BD.
A) What OADMs would you deploy at each node?
B) At a later point, the light path traffic changes and we need to replace light paths AC and BD with AD and BC. What changed would you have to make in order to support the new traffic.
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