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Last-mile lightpath services : on packet-switched shared infrastructure

Biesbroek, Rudolf (2014) Last-mile lightpath services : on packet-switched shared infrastructure.

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Abstract:Lightpath services o�er a great incentive for data-intensive scientific research and are widely used within and across NREN networks. Extending dynamic lightpaths into the last-mile in a flexible manner with very low provisioning time is the holy grail to achieve, since this would truly serve the end-user. However, the uptake of dynamic lightpaths in last-mile networks is low and a generic solution does not exist. This empirical study investigates the possibilities to extend lightpaths on existing last-mile infrastructure. An experimental setup is used to examine the transmission characteristics when lightpaths are provided over an existing packet-switched last-mile infrastructure, and the consequences for the routed tra�c. The results revealed that in the absence of other tra�c, no significant difference between the physical dedicated lightpath and the packet-switched lightpath regard- ing transmission characteristics is observed. However, under congested conditions a best-e�ort packet-switched shared infrastructure cannot prevent lightpath tra�c from gaining a large part of the resources, thereby suppressing existing background tra�ffic or vice versa. The study also revealed that using strict priority scheduling with tra�c policing enables lightpath tra�c to experience network performance as if no other network tra�c exists, while limiting interference with existing background tra�c. It can be concluded that QoS enabled network devices are able to provide lightpath connectivity on last-mile packet-switched shared infrastructures. Moreover, to improve network utilization, a Network Resource Manager (NRM) could be used. This study provides insight into the feasibility to provide lightpath connectivity into the last mile and serve as basis for future studies. Moreover, the findings may support the decision making process to implement dynamic lightpath services in last-mile networks on existing infrastructures.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Telematics MSc (60032)
Link to this item:http://purl.utwente.nl/essays/65032
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