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Proceedings Paper

Effects of network node consolidation in optical access and aggregation networks on costs and power consumption
Author(s): Christoph Lange; Ralf Hülsermann; Dirk Kosiankowski; Frank Geilhardt; Andreas Gladisch
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Paper Abstract

The increasing demand for higher bit rates in access networks requires fiber deployment closer to the subscriber resulting in fiber-to-the-home (FTTH) access networks. Besides higher access bit rates optical access network infrastructure and related technologies enable the network operator to establish larger service areas resulting in a simplified network structure with a lower number of network nodes. By changing the network structure network operators want to benefit from a changed network cost structure by decreasing in short and mid term the upfront investments for network equipment due to concentration effects as well as by reducing the energy costs due to a higher energy efficiency of large network sites housing a high amount of network equipment. In long term also savings in operational expenditures (OpEx) due to the closing of central office (CO) sites are expected. In this paper different architectures for optical access networks basing on state-of-the-art technology are analyzed with respect to network installation costs and power consumption in the context of access node consolidation. Network planning and dimensioning results are calculated for a realistic network scenario of Germany. All node consolidation scenarios are compared against a gigabit capable passive optical network (GPON) based FTTH access network operated from the conventional CO sites. The results show that a moderate reduction of the number of access nodes may be beneficial since in that case the capital expenditures (CapEx) do not rise extraordinarily and savings in OpEx related to the access nodes are expected. The total power consumption does not change significantly with decreasing number of access nodes but clustering effects enable a more energyefficient network operation and optimized power purchase order quantities leading to benefits in energy costs.

Paper Details

Date Published: 23 January 2010
PDF: 13 pages
Proc. SPIE 7621, Optical Metro Networks and Short-Haul Systems II, 76210F (23 January 2010); doi: 10.1117/12.841797
Show Author Affiliations
Christoph Lange, Deutsche Telekom AG (Germany)
Ralf Hülsermann, Deutsche Telekom AG (Germany)
Dirk Kosiankowski, Deutsche Telekom AG (Germany)
Frank Geilhardt, Deutsche Telekom AG (Germany)
Andreas Gladisch, Deutsche Telekom AG (Germany)


Published in SPIE Proceedings Vol. 7621:
Optical Metro Networks and Short-Haul Systems II
Werner Weiershausen; Benjamin Dingel; Achyut Kumar Dutta; Atul K. Srivastava, Editor(s)

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