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Communications Magazine, IEEE

Issue 10 • Date Oct. 1997

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Displaying Results 1 - 18 of 18
  • Simulation Techniques [Book Review]

    Publication Year: 1997 , Page(s): 9 - 14
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    Freely Available from IEEE
  • Management of Broadband Networks

    Publication Year: 1997 , Page(s): 36 - 38
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  • Intranet Services and communication Management

    Publication Year: 1997 , Page(s): 78 - 83
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  • Doubling the capacity of a communications satellite system

    Publication Year: 1997 , Page(s): 142 - 147
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    Two one-way channels are normally used in digital two-way voice communication. Each channel is in effect-used only one half the time. A recent discovery of ours recognized that any one-way channel within a satellite spot-beam can be accessed by anyone in the footprint of the beam. In a two-way voice call, the two parties alternate (in principle) in their transmissions-when one speaks the other is silent. Therefore, the two can share a single one-way channel and provide continuous use of the channel, their respective transmissions interleaved with one another. This condition is unique to intrabeam communication via satellite (or balloon). In a satellite system, capacity is a valued commodity, where capacity is limited by allocated bandwidth and power available. Under those two constraints of bandwidth and power limitation, the discovery described generates a doubling of capacity. This article addresses this concept and some of the engineering challenges and opportunities arising therefrom View full abstract»

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  • Application of adaptive array antenna to a TDMA cellular/PCS system

    Publication Year: 1997 , Page(s): 148 - 152
    Cited by:  Papers (7)
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    This article discusses the use of an adaptive array antenna technology in a TDMA cellular/personal communications services (PCS) system and demonstrates that the adaptive array antenna improves cell coverage, provides better signal quality, and reduces cost of deployment of cellular/PCS service in a given area View full abstract»

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  • On architectures for broadband wireless systems

    Publication Year: 1997 , Page(s): 132 - 140
    Cited by:  Papers (3)  |  Patents (1)
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    The growing popularity of portable and mobile computing and communication devices, along with the introduction of wireline broadband networks, is fueling demand for wireless broadband networks. Since ATM has been accepted as the standard for broadband integrated service networks, the authors consider the problem of providing “ATM-like services” to mobile devices. The fundamental issues that have to be tackled in order to provide broadband services which are currently available (or will be very shortly) to wireline hosts are discussed. The authors compare and contrast the architectures that have been proposed for extending the broadband wireline network infrastructure to the wireless environment. It is argued that transporting small ATM cells over the air leads to inefficient utilization of the already scarce transmission capacity. Subsequently, the authors propose an architecture for integrated wireless and wireline broadband networks which allows the wireline and wireless parts of the network to be designed independently, therefore allowing each to be optimized for the environment in which it operates. At the same time, the proposed architecture also permits simple and efficient interconnection between the wireline and wireless infrastructures View full abstract»

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  • Lessons learned from multimedia field trials in Germany

    Publication Year: 1997 , Page(s): 40 - 45
    Cited by:  Papers (1)  |  Patents (3)
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    Multimedia applications have been evaluated in multiple field trials for some years. Experience was gained on the application, network services, and technology levels. Lessons learned from multimedia field trials will influence development, rollout and operations of future broadband networks. In this article the results of some multimedia field trials conducted in Germany are analyzed. It includes an overview on multimedia experiments conducted over the past decade. A classification of multimedia applications, services, and platforms is followed by a description of a set of experiments. The trials were carried out for business and residential user groups. The technologies utilized in these tests are described in the respective contexts. Finally, the experiences are summarized and areas that need further study are identified View full abstract»

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  • TMN-based customer network management for ATM networks

    Publication Year: 1997 , Page(s): 46 - 52
    Cited by:  Papers (5)
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    Effective end-to-end management of today's globalized heterogeneous corporate customer networks, a mixture of ATM WANs and ATM LANs, is essential for customers at the cutting edge of technology. ATM WAN and ATM LAN management systems generally have different management policies and management information models. Studies on the customer network management system (CNMS) to realize end-to-end customer network management have thus adopted the telecommunications management network (TMN) interoperability concept, which is based on CNM manager and agent interoperation. This article proposes an end-to-end customer network management method that realizes interoperation. In order to realize configuration management, fault management, and performance management, the CNM agent extracts the information needed by CNMS from the ATM transport network operations system and controls the operations system accordingly View full abstract»

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  • Managing PC networks

    Publication Year: 1997 , Page(s): 112 - 117
    Cited by:  Papers (4)  |  Patents (6)
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    The increasing number and heterogeneity of networked personal computers (PCs) along with the integration of PC networks into classical data processing infrastructures consisting of UNIX, NT, and mainframe servers is one of the most important computing trends in recent years. The variety of operating systems and system configurations turns management in this environment into a complex task. Obviously, this scenario cannot be efficiently managed with proprietary or dedicated tools alone. Management applications must become part of an integrated network, system and application management solution. This need is further exacerbated by the increasing appearance of mobile systems. Relevant management tasks such as inventory management, software distribution, remote control, and license management are presented according to their need in different PC networking environments. An overview of the DMI standard of the DMTF as well as the Web-based enterprise management (WBEM) and Java management API (JMAPI) activities is followed by a discussion of organizational and operational issues for PC management projects. A brief outlook concludes the presentation of this new, complex and very dynamic area in management View full abstract»

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  • Evolution of TMN network object models for broadband management

    Publication Year: 1997 , Page(s): 60 - 65
    Cited by:  Papers (4)
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    Telecommunications management network (TMN)-based object models need to satisfy the three objectives of interoperability, integration, and flexibility in order to support rapid provision of future broadband services. While current models are focused on interoperability, it is necessary to consider new techniques to deliver the integration and flexibility capabilities required for these services. The Open Distributed Processing Reference Model (RM-ODP), coupled with CORBA technology, has been proposed as a distributed environment to provide the integration and flexibility capabilities lacking in existing protocols. Existing protocols will continue to be widely used for broadband management interfaces as the distributed environment evolves. The challenge is to maximize the benefits of the distributed environment without compromising the benefits already delivered by the existing protocols. A multiplicity of models has been developed to differing requirements and using differing methodologies. Although there is much commonality between these models, a final stage of convergence is needed to produce a unified network model. There are outstanding issues for definition of management services, resource models, and at the computational level, which need to be resolved for successful evolution to distributed systems. However, a partnership between formal standards bodies and other organizations and consortia which exploits their complementary strengths will ensure that distributed network management of the TMN will become a reality View full abstract»

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  • Web-based intranet services and network management

    Publication Year: 1997 , Page(s): 100 - 110
    Cited by:  Papers (11)  |  Patents (5)
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    Intranets are composed of a network of various devices, systems, and services supporting a wide variety of applications within an organization. Providing a secure, reliable, and efficient operating environment to support the organization's daily activities and its business is the most challenging task faced by operations and management staff today. Current management practices typically involve the use of separate, incompatible tools and techniques for managing networks, systems, and applications. What is needed desperately is a simple, uniform framework for managing not only networks but also systems and applications. Web-based management is a promising approach that can provide a truly integrated management solution. This article examines the key emerging technologies involved in Web-based management. The authors present an integrated architecture that can be used to manage all the networking and computing resources in an Intranet. Also presented are several specific examples where Web technology has been applied in managing different target resources for validating the architecture View full abstract»

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  • An outlook on intranet management

    Publication Year: 1997 , Page(s): 92 - 99
    Cited by:  Papers (1)  |  Patents (1)
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    The growing trend of corporate organizations to embrace intranet technology is accelerating the computing paradigm shift from a desktop-centric model to a network-centric one. Intranet revamps the enterprise LAN and WAN by adorning them with the glaze of Internet attire. As with any kind of network, intranet reliability is subordinate to the attention and effort put into its management. Since what characterizes an intranet is not only its network infrastructure but also its information content and the way it is created, shared, and stored, intranet management must extend beyond typical network management issues and encompass service management. The authors elaborate on intranet management and reflect on the challenges it poses View full abstract»

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  • Broadband management after permanent connections

    Publication Year: 1997 , Page(s): 54 - 59
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    There is now general agreement about the management of ATM cross-connects and permanent virtual circuits. This is a significant achievement of international collaboration and cooperation, and its benefits will be felt increasingly strongly as we enter the new millennium. However, there are three further issues for the management of ATM networks which need to be resolved before the work of this millennium can be considered to be complete. These are the management of switched virtual circuits, the coordination of management between different operators, and the different management protocols and their evolution. These issues are discussed, and new international standards which relate to them are introduced View full abstract»

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  • Customer and network operations for broadband and narrowband access networks

    Publication Year: 1997 , Page(s): 66 - 71
    Cited by:  Papers (1)
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    Effective operations of today's access networks based on intelligent, computer-controlled network elements is a key issue. Due to the increased complexity of operation and the cost pressure in a competitive telco environment, a possible answer for these challenges is the introduction of sophisticated network operations (network management) technologies. On the other side, the costs of customer operations in connection with access networks are also very substantial. Any improvement in this field can increase the capabilities of the access operator to maximize the revenue stream. Another issue is that in the near future all operators will be forced to introduce next-generation customer operation systems simply to be able to survive. This article discusses the general issues of both access network management and customer operations in a tutorial manner View full abstract»

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  • The CSELT intranet services

    Publication Year: 1997 , Page(s): 118 - 121
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    The authors summarize CSELT's experience in setting up a corporate intranet as a way to distribute and publish information. The intranet architecture and the main services offered are presented, with an outline of the deployment and organizational aspects. Finally, the CSELT intranet evolution as foreseen is presented. The general architecture of the document and information management system allows the use of different products for different document processes, but ensures a unique access to the information based on World Wide Web technology. In this way the document management system is open to integrating new products to be used for particular needs, leaving the user interface unchanged View full abstract»

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  • Intranets: technologies, services and management

    Publication Year: 1997 , Page(s): 84 - 91
    Cited by:  Patents (1)
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    An intranet is a network which facilitates seamless computing and communications-using mostly Internet software and hardware technologies-within a corporation. The key issues, challenges, technological and policy enablers, and driving expectations of customers and/or applications of corporate networks are reviewed. Management of service and information transport are then examined. Various phases in the life cycle of enterprise networks (ENs) are then presented. Finally, one possible path for the evolution of existing ENs to intranets or next-generation ENs is discussed View full abstract»

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  • Managing the last mile [access network]

    Publication Year: 1997 , Page(s): 72 - 76
    Cited by:  Papers (3)
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    No matter how good the transmission technology, if you can not manage it, you can not use it. Telecommunications planners are faced with simultaneously provisioning the explosion of lines linking homes and businesses with central offices and planning for a future where highly sophisticated interactive broadband services must be provided. Managing all portions of the network is complicated, but none more so than the access network known colloquially as “the last mile,” the low data speed capacity lines that actually connect the home or business to the high-speed network. Before a line used for plain old telephone service (POTS), called a loop, can be used in higher speed applications it must be checked to make sure that it has the right electrical characteristics. The evolution of the loop from POTS to midband to broadband usage is examined emphasizing the relevant plant administration processes. Using today's special service administration is an expensive way to provide service. Alternates to special service provisioning are described View full abstract»

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  • General packet radio service in GSM

    Publication Year: 1997 , Page(s): 122 - 131
    Cited by:  Papers (90)  |  Patents (14)
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    In the Global System for Mobile Communications (GSM) Phase 2+ development, one major activity is to specify the general packet radio service (GPRS). The standardization is expected to be completed at the end of 1997. The purpose of GPRSI like other packet data services, is to efficiently accommodate data sources that are bursty in nature. Another important goal of the technology is to make it possible for GSM license holders to share physical resources on a dynamic, flexible basis between packet data services and other GSM services. The authors present a detailed description of the GPRS system, emphasizing the radio link protocol, and demonstrate its performance. The performance measures have been obtained from the WINLAB GPRS simulator View full abstract»

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Aims & Scope

IEEE Communications Magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications systems (PCS), ISDN, and more.

Full Aims & Scope

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Editor-in-Chief
Osman Gebizlioglu
Huawei Technologies