by

DOI: 10.1023/A:1018700218505
Print publication date: 12/1/1999
View article on SpringerLink

by Ho, L. Lawrence

DOI: 10.1023/A:1018748101667
Print publication date: 12/1/1999
View article on SpringerLink

by Cho, Young-Hyun; Tokunaga, Hiroshi; Hong, James W.; Chujo, Takafumi

DOI: 10.1023/A:1018796017597
Print publication date: 12/1/1999
View article on SpringerLink

by Chen, Graham; Kong, Qinzheng; Etheridge, Jaon; Foster, Paul

The deregulation of the global telecommunicationindustry has seen a change in the business andoperational environment in which services are deployedand managed. The requirements have intensified toprovide a management framework for telecommunicationnetworks and services across multiple technology domainsand using multiple management technologies. This paperdescribes an integrated TMN service management architecture that provides an environment fordifferent service management functions and differentmanagement domains to be integrated. To furthersubstantiate this architecture, a system was built todemonstrate the integration concepts. The research anddevelopment work reported in this paper focuses on thefollowing two aspects of integration: first theintegration between TMN network and service managementfunctions; and next the integration between differentservice management functions. A proof of concept systemwas developed to demonstrate such integration. Itconsists of the following components: Generic service ordering and provisioning; connectionmanagement based on a generic network model concept; andservice management based upon service level agreementmanagement and customer service management concepts. This paper reports this work and theexperiences gained from this research.

DOI: 10.1023/A:1018744000758
Print publication date: 12/1/1999
View article on SpringerLink

by Znaty, Simon

New open service architectures are now emerging.An important part of these architectures is theconnection management function. It enables theestablishment, control and release of semipermanentconnections requested by telecommunications services suchas virtual private networks. This paper presents thespecification, design and implementation of thisconnection management function in our OAMS Open Service Architecture. The proposed architecture isdeployed over a distributed processingenvironment.

DOI: 10.1023/A:1018791916688
Print publication date: 12/1/1999
View article on SpringerLink

by Mountzia, Maria-Athina; Rodosek, Gabi Dreo

This paper proposes the application of conceptsfrom the area of intelligent agents to overcomedeficiencies of existing management architecturesregarding distribution of functionality and flexibility. Its main contribution is the proposal of amethodology for a flexible, distributed realization ofcomplex management tasks. The main application areas aredistributed services which are complex pieces of software, distributed across variousheterogeneous end systems in a network. Mostly, theyrely on the provision of other services as well. Theapproach relies on well-known concepts, such ascooperative distributed problem solving and intelligentagents, and offers a framework to combine these twoconcepts, providing a step on the roadmap to a flexible,distributed management architecture. The assessment of the approach is displayed throughout thepaper by scenarios from the area of nontime criticalfault management.

DOI: 10.1023/A:1018739932618
Print publication date: 12/1/1999
View article on SpringerLink

by Klemettinen, Mika; Mannila, Heikki; Toivonen, Hannu

Fault management is an important but difficultarea of telecommunication network management: networksproduce large amounts of alarm information which must beanalyzed and interpreted before faults can be located. So called alarm correlation is acentral technique in fault identification. While the useof alarm correlation systems is quite popular andmethods for expressing the correlations are maturing, acquiring all the knowledge necessary forconstructing an alarm correlation system for a networkand its elements is difficult. We describe a novelpartial solution to the task of knowledge acquisition for correlation systems. We present a methodand a tool for the discovery of recurrent patterns ofalarms in databases; these patterns, episode rules, canbe used in the construction of real-time alarm correlation systems. We also present tools withwhich network management experts can browse the largeamounts of rules produced. The construction ofcorrelation systems becomes easier with these tools, as the episode rules provide a wealth ofstatistical information about recurrent phenomena in thealarm stream. This methodology has been implemented ina research system called TASA, which is used by several telecommunication operators. We briefly discussexperiences in the use of TASA.

DOI: 10.1023/A:1018787815779
Print publication date: 12/1/1999
View article on SpringerLink

by Grover, Wayne D.

There is growing interest on the part of networkoperators in the ability to analyze the availability ofpath implementations in their networks and to providevarious grades of assured service availability to customers. The calculation of availabilityis, however, considerably more complex in today’s SONETring-based networks than in prior point-to-pointsystems. This is due both to the active protection nature of the rings and their dual-redundantinterconnect strategies. We show that there is also morethan one option for dual-ring interconnection and thata minimum cost high availability path implementation will generally involve a mixture ofmatched-node and explicitly dual fed treatments. Wedevelop an economic comparison of dual feeding (df) andmatched nodes (mn) in terms of the resource consumptionof each scheme and show that the choice can bemade on an individual ring-by-ring basis with a simpledecision criterion. We then develop expressions ofgeneral use for the end-to-end unavailability ofsingle-fed, pure df, mn and mixed df-mn path constructions.These results are a step towards on-line provisioning orpath planning systems that can minimize the pathimplementation cost subject to an assured target level of design availability.

DOI: 10.1023/A:1018735831709
Print publication date: 12/1/1999
View article on SpringerLink

by Bernstein, Lawrence; Yuhas, C. M.

DOI: 10.1023/A:1018783714871
Print publication date: 12/1/1999
View article on SpringerLink