RAMON Reliability, Availability and Maintainability of Optical Networks

• Forschungsstelle: COST
• Projektnummer: C01.0087
• Projekttitel Englisch: RAMON Reliability, Availability and Maintainability of Optical Networks

Schlüsselwörter (Englisch)

Optical networks; reliability; availability; maintainability

Forschungsprogramme (Englisch)

COST-Action 270 - Reliability of Optical Components and Devices in Communication Systems and Networks

Kurzbeschreibung (Englisch)

See abstract

Weitere Hinweise und Angaben (Englisch)

Full name of research-institution/enterprise: Eidg. Materialprüfungs- und Forschungsanstalt EMPA Abteilung Elektronik/Messtechnik

Partner und Internationale Organisationen (Englisch)

AT, BE, CY, DK, FR, DE, HU, IT, LV, NL, PL, ES, SE, CH; UK

Abstract (Englisch)

Highly reliable and available telecommunication networks are a prerequisite for the information based society. Availability of communication networks is as important as other basic infrastructure like roads, water, and power. Existing electro-optical and future all-optical networks will provide the pathways to transport data at rates up to terabits/s for a variety of services. The allocation of resources and exploitation of the progress in technol-ogy must be optimized in order to provide services fulfilling different quality of service QoS requirements under total cost consideration. Advanced networks transporting mission critical business data depend on reliable hardware, stable software, and on protection or restoration mechanisms in case of failures. Availability of the physical transport layer and control software is thereby a factor of growing importance due to the increasing amount of lost data and the consequential high business and economic losses in case of technical fault or attack. Networks are generally designed physically survivable for the case of a single span failure by various protection or restoration strategies which compete in minimizing spare capacity. The impact of dual failures which can lead to unavailability, i.e. downtime and lost traffic is thus considered. Network performance with respect to availability, traffic loss, spare capacity consumption and dual failure restorability is investigated for optical long-haul networks under sophisticated survivability strategies with the objective to provide a quantitative basis for network optimization decision. Traditional availability analysis methods based on reliability block diagrams are not suitable for the dual failure case of mesh-restorable networks with widely distributed and interdependent spare capacity. Therefore, new restoration-aware methods for transport and network availability performance assessment are developed. They com-prise the complete network topology, traffic matrix, the exact allocation of working and spare capacity for various survivability strategies, the failure sequence, and the implemented restoration dynamics. Methods of mathematical programming such as linear and integer linear programming are implemented and new algorithms developed for the overall optimization of performance, availability, and cost.

Datenbankreferenzen (Englisch)

Swiss Database: COST-DB of the State Secretariat for Education and Research Hallwylstrasse 4 CH-3003 Berne, Switzerland Tel. [phone] Swiss Project-Number: C01.0087