Shoichiro Nakai

An architecture for integrated network management

An architecture is proposed for an integrated network management system (INMS) based on an object-oriented approach. The INMS consists of a central manager (INMS center) and subnetwork management systems (subNMSs). Each of the subNMSs manages a subnetwork which usually consists of similar types of equipment. The INMS center manages network objects such as end-to-end paths and intersubnetwork links, which cannot be viewed from individual subNMSs. The network management protocols between the central manager and the subNMSs are based on the OSI (Open Systems Interconnection) systems management protocols. An object-oriented network modeling is devised to facilitate interfacing the network management software to the managed objects. The kernel module of the proposed architecture is called the Network Resource Manager (NRM). The principal function of the NRM is a uniform management of the network objects which reside both in the individual subnetwork and in the INMS center.<<ETX>>

Real-Time Bifocal Network-Visualization

Although most current management systems employ graphic-user-interface displays to visualize the networks being managed, this approach1 is rather difficult to apply to extremely large-size networks (e.g. those with hundreds of complexly connected devices) since the full picture cannot easily be presented within the limited display space available. The conventional tactic employed to avoid this problem, hierarchical multi-window presentation, has disadvantages of its own, e.g. the complexity of the operations required to move among separate windows, etc. In this paper, we describe an approach to visualizing networks which uses a bifocal display capable of displaying both context and local details simultaneously within a single window and without the loss of information that overlapping windows would produce. We implemented the bifocal network visualization system on a workstation using a frame-buffer memory for real-time image generation, and with the aid of an event simulation program, we were able to operate our proposed system experimentally and confirm the effectiveness of bifocal network visualization. 867 0-7803-181 1-0/94

An automatic generation of management information base (MIB) for OSI based network management system

04.0001994IEEE Real-time Bifocal Network Visualization cope 0 Conventional hierarchical win ow display * Bifocal ne ork visualizati 0 Presentation of network configuration 0 Event monitoring using bifocal display are system for real-time bifocal display In this paper, we present a real-time bifocal network visualization technique. First, we describe the conventional approach (hierarchical network presentation) and discuss its advantages and disadvantages. Next, we introduce our own approach (bifocal network visualization), which overcomes the disadvantages of the conventional. We then present the main implementation of the new approach. Finally, we discuss an example performance evaluation of our approach.

Concurrent network management system using distributed processing techniques

The authors propose an automatic generation of a management information base (MIB), which forms one part of the total NMS (network management system) development support tools. The proposed MIB has capabilities to manage the management information distributed over a network, and gives a convenient object-oriented interface for application programs to handle the distributed information in a transparent fashion. MIB libraries and tools have been developed, part of which can be used as the application interfaces, while others are used internally in the MIB. These libraries and tools cooperatively make possible the automatic generation of MIB. The implementation of the proposed MIB has been done, and it is being applied to real NMS products.<<ETX>>

Automatic tuning of ADSL circuits

This paper proposes a concurrent network management system which can integrate various management applications in an efficient way. The proposed system provides both techniques and tools to attain concurrent execution of management applications in a distributed processing environment. For instance, each concurrently executed management application has its own communication module, named the virtual object, that interacts with other applications. The virtual object as a much enhanced version of the well-known RPC stub is capable of managing application connections and communicated data structures, or handling communication errors. The efficiency of integration is further enhanced through the use of a virtual object generator, which automatically generates the virtual object program codes. The effectiveness of the proposed system has been tested and confirmed in a newly developed experimental system that integrates our management applications such as network design, control, and diagnosis.<<ETX>>

Hardware-oriented TMN systems

The number of ADSL users in Japan has been rapidly increasing, as ADSL can offer high-speed Internet access for a relatively cheap price. ADSL requires a link to be established between the ATU-C (ADSL terminating unit - center) and ATU-R (ADSL terminating unit - remote) before communications can begin, and its links often go down in noisy circumstances affected by the power of home appliances AM radio transmission and so on. Users tend to complain about the quality of ADSL service to the provider by phone, and having to deal with a large number of calls naturally affects business operations. This paper introduces an ADSL integrated management system (DSL-IMS) that can automatically tune the ADSL circuit according to each users environment and stabilize the circuit while maintaining a high data rate. According to the operational result in the real field, DSL-IMS could stabilize the average 97% of the new registration circuits automatically and it could also reduce approximately 45% of operational cost per a circuit. The paper also describes our approach of using DSL-IMS with which we provide ADSL service to more than 1.7 million subscribers.

DUALQUEST: an implementation of the real-time bifocal visualization for network management

The TMN (Telecommunication Management Network) standard is an interoperable framework for the management of telecommunication networks and services. While its capability and functionality are recognized around the world, many networks and network elements lack the computing resources required to implement a complex TMN functionality. A number of reasonable approaches to this problem have been reported, such as a lightweight protocol, Q-adaptation, and Q-addition. However, these approaches suffer from the problem of a required trade-off between system overhead and TMN functionality. The hardware-oriented TMN proposed by the authors is one possible answer to this problem.

Video-on-demand system with program relocation center

Most of the current network management systems employ graphic-user-interfaces for the network visualization purposes. These are well suited for both small- and medium-size networks. For a large-size network, hierarchical multi-window-based network visualizations are usually used; however, tracing a long path (i.e., composed of a huge number of nodes) may meet some difficulties because it must be at first divided into several segments displayed segment-by-segment in several windows. In addition, window manipulations, such as opening and closing operations, are quite complex. To overcome the disadvantages of the multi-window network visualization, we proposed a real-time bifocal network visualization that is capable of displaying both the context and all details of a network within a single window (Fuji, 1994). This paper enhances that approach and describes an implementation, called DUALQUEST, that was installed in a workstation equipped with a frame buffer memory proposed in (Matoba, 1990) for real-time bifocal image processing.