Reliability and cost analysis of passive optical networks
2007 (English)In: 2007 ICTON Mediterranean Winter Conference, 2007, 273-273 p.Conference paper (Refereed)
In this talk the cost of building resilient passive optical networks (PONs) is analyzed in relation to the connection availability performance. Both standard and several novel PON protection architectures are considered [1 - 6]. A new measure for cost efficiency of protection is proposed to compare different protection architectures in order to select the most appropriate ones for particular groups of clients. Fault management in communication networks becomes more significant due to the increasing demand for reliable service delivery. On the other hand, access network providers need to keep capital and operational expenditures (CAPEX and OPEX) low in order to be able to offer economical solutions for the customers. Improving network reliability performance by adding redundant components and systems is expensive and thus, not always very suitable for cost-sensitive access networks. The evolution of protection schemes for PONs can be divided into two phases. In the first one, the standard protection architectures were defined by ITU-T  around a decade ago. They are based on duplication of the network resources and are referred to as type A, B, C and D. In Type A only the feeder fiber (FF) is redundant. Type B protection duplicates the shared part of the PON, i.e., FF and optical interfaces at the OLT. In Type B the primary optical interface at OLT is normally working while the second one is used as a cold standby. Type C represents 1+1 dedicated path protection with full duplication of the PON resources. In Type C both the primary and secondary interfaces are normally working (hot standby), which allows for very fast recovery time. Type D protection specifies the independent duplication of FF and distribution fibers (DFs) and thus, it enables network provider to deliver services for different users with different reliability. Obviously, the ITU-T standard Type C and Type D with full protection offer relatively high connection availability but unfortunately they require duplication of all network resources (and investment cost) to realize the protection, which may result in CAPEX that is too high for the cost-sensitive access networks. Therefore, in the second phase of the PON protection scheme evolution the effort was put on the development of cost-efficient architectures [2 - 6]. To evaluate the different PON protection schemes we propose a cost-reliability measure (CRM) in order to capture the trade-off between the deployment cost and reliability performance. The CRM values obtained for each considered protection scheme allow for selecting the most cost-efficient protection for PON customers.
Place, publisher, year, edition, pages
2007. 273-273 p.
network protection, passive optical networks
IdentifiersURN: urn:nbn:se:kth:diva-39650DOI: 10.1109/ICTONMW.2007.4446913ISI: 000255866500072ScopusID: 2-s2.0-47249158914ISBN: 978-1-4244-1639-4OAI: oai:DiVA.org:kth-39650DiVA: diva2:440246
ICTON-MW'07 - International Conference on Transparent Optical Networks 'Mediterranean Winter' 2007; Sousse; 6 December 2007 through 8 December 2007