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Mạng và viễn thông P27

Telecommunications Management Network (TMN) The goalof the ‘telecommunications management network’o r ‘ T M Nis to provide for consistent and efficient management of complex telecommunications networks. The T M N model describes the basic operating and management functionswhich a network operator has to conduct and the standard interfaces to be used between network components and network managementsystems. | Networks and Telecommunications Design and Operation Second Edition. Martin P. Clark Copyright 1991 1997 John Wiley Sons Ltd ISBNs 0-471-97346-7 Hardback 0-470-84158-3 Electronic PART 5 RUNNING A NETWORK Networks and Telecommunications Design and Operation Second Edition. Martin P. Clark Copyright 1991 1997 John Wiley Sons Ltd ISBNs 0-471-97346-7 Hardback 0-470-84158-3 Electronic __27 Telecommunications Management Network TMN The goal of the telecommunications management network or TMN is to provide for consistent and efficient management of complex telecommunications networks. The TMN model describes the basic operating and management functions which a network operator has to conduct and the standard interfaces to be used between network components and network management systems. Key elements of the TMN concept are the management model the Q3-interface and the CMIP common management information protocol . We discuss them all in this chapter which in parallel gives an insight into the problems of managing complex networks. At the end we also briefly discuss the SNMP simple network management protocol which is used as an alternative to CMIP in many corporate and Internet router networks. 27.1 THE PROBLEMS OF MANAGING NETWORKS Figure 27.1 illustrates a typical telecommunications network of today. It provides a valuable insight into the complexity of managing even relatively simple telecommunications networks. The figure shows a simple data network composed of four different component types but each provided by different manufacturers. They each have independent network management systems NMS . Each NMS is capable of monitoring and controlling every aspect its manufacturer s network equipment but is incapable of monitoring or controlling other manufacturers devices. The component types shown are data switches managed by a proprietary network management system NMS1 SDH synchronous digital hierarchy transmission .