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Journal of Network and Systems Management

, Volume 1, Issue 2, pp 143–169 | Cite as

Impact of a transmission facility link failure on dynamic call routing circuit-switched networks under various circuit layout policies

  • D. Medhi
  • S. Sankarappan
Papers

Abstract

A major transmission facility failure such as a fiber cut can significantly deteriorate the performance of a network by affecting multiple trunk groups in the network. To improve network performance various restoration options (pre-planned or real-time) in the traffic and/or the transmission facility network can be addressed. In this paper, we address the implication of various pre-planned circuit layout policies (based on trunk group diversity) on dynamic routing circuit-switched networks in the event of a failure. Using a network based on realistic data, we give results on comparative network performance under different circuit layout policies and on the effect of a failure depending on the time of the day it occurs. We observe that in the event of a failure, a network with trunk group diversity provides load balancing in terms of pairwise blocking and avoids isolation of traffic pairs compared to a network without trunk group diversity. However, in some instances, the overall network blocking may not be lower in a network with trunk group diversity compared to a network without trunk group diversity.

Key words

Circuit-switched network dynamic call routing circuit layout trunk group diversity network failure 

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Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • D. Medhi
    • 1
  • S. Sankarappan
    • 2
  1. 1.Computer Science Telecommunications ProgramUniversity of Missouri—Kansas CityKansas City
  2. 2.DAVID Systems, Inc.Sunnyvale

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