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Optical Networks - _Problems8_114

Optical Networks - _Problems8_114 - Problems 567 B A C E D...

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Problems 567 A C D E B Figure 9.28 Network topology for Problem 9.6. Problems 9.1 Consider a shared protection ring with two types of restoration possible. In the first scheme, the connection is rerouted by the source and destination around the ring in the event of a failure. In the second, the connection is rerouted around the ring by the nodes adjacent to the failed link (as in a BLSR). Give an example of a traffic pattern where the first scheme uses less ring bandwidth than the second. Give another example where the two require the same amount of bandwidth. 9.2 Show that in a ring architecture if the protection capacity is less than the working capacity, then service cannot be restored under certain single failure conditions. 9.3 Compare the performance of UPSRs and BLSR/2s in cases where all the traffic is between a hub node and the other nodes. Assume the same ring speed in both cases. Is a BLSR/2 any more efficient than a UPSR in traffic-carrying capacity in this scenario?
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  • Spring '09
  • Boussert
  • Synchronous optical networking, Network topology, Time-division multiplexing, Wavelength-division multiplexing, traffic-carrying capacity, SONET ring architecture

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