nces for the material discussed in this chapter. As an additional reference it is suggested visiting the web pages on the opensource components discussed in this chapter. This will give a better understanding of the specific component and how it fits in the complete NMS package. 1. openNMS: www.opennms.org 2. openORB: openorb.sourceforge.net 3. JacORB: www.jacorb.org 4. JBoss: www.jboss.org 5. JOnAS: jonas.objectweb.org 6. openCCM: openccm.objectweb.org 7. JFreeChart: www.jfree.org/jfreechart/ 8. Log4J: logging.apache.org/log4j/1.2/index.html 9. BouncyCastle: www.bouncycastle.org 10. Hibernate: www.hibernate.org 11. edtFTPJ: www.enterprisedt.com/products/edtftpj 12. WestHawk: snmp.westhawk.co.uk 13. NetSNMPJ: netsnmpj.sourceforge.net Chapter 12 NMS Functions This chapter is intended to provide the reader with a basic understanding about the functions available in a network management system (NMS). At the end of this chapter you will have a good understanding of the categories under which network functions can be grouped in the eTOM (enhanced telecom operations map) model. This would include a discussion of the categories and how it maps to actual func- tions in the NMS. 12.1 Introduction The TMF (TeleManagement Forum) expanded the network and service manage- ment layers in the TMN model to have more detailed mapping of the telecom oper- ations and created the TOM model. Later the TOM model was revised by TMF to have three main sections: SIP (strategy, infrastructure, and product), OFAB (opera- tions, fulfillment, assurance, and billing), and enterprise management. This revised model is called eTOM. The functions of the NMS mainly fall under the resource management layer of eTOM that spreads across SIP and OFAB. Though the NMS data can be used for planning phases in SIP, its functions can be directly mapped to real-time network configuring and maintenance in OFAB. So this chapter will mainly be about the network management functions from the categories of resource management in OFAB of the eTOM model. The followin