Private Telecommunications Network Research Articles

Opis postupka tunelovanja Q signalizacije u privatnim telekomunikacionim mrežama

Introduction/purpose: The article should specify the network signaling type Q-SIG, which is standardized especially for implementation in digital telecommunication networks of integrated services (ISDN), emphasizing the possibility of its further application in the Private Telecommunications Network of Integrated Services of the Serbian Armed Forces (PISN of SAF), i.e. in the Private Automatic Telephone Network of the Serbian Armed Forces (PATN of SAF). Methods: An analysis of the existing standards was performed: ECMA355 and ECMA-336 and a synthesis of the possibilities of their application in the PATN of SAF. Results: The procedure for the application of Q-SIG is processed in a situation when the peripheral parts of the PISN of SAF, which operate on the principle of transmission and circuit switching by TDM (Time Division Multiplexing), are connected via a central Core network with the IP (Internet Protocol), which operates on the principle of packet transmission and switching with the SIP (Session Initiation Protocol). A method of the application of the tunneling of encapsulated Q-SIG messages through the IP network, defined by ECMA-355 Standard, has been developed. The necessary functions for mapping the transmission of tunneled signaling messages Q-SIG and mapping voice (and other audio) information to media streams during VoIP (Voice over IP) communication through that network, which are defined by ECMA-336 Standard, are described. Conclusion: The application of ECMA-355 and ECMA-336 Standards is a new solution in the PATN of SAF with the use of the IP network to connect the IP PINX using the Q-SIG tunneling procedures and mapping functions for their transmission and transmission of audio signals. This then opens up a whole range of new possibilities that, with the growth of the Core network and their application, will rapidly contribute to the creation of a broad Telecommunication information system backbone for the implementation of real-time multimedia communications and the transition to Unified Communications (UC).

AN APPLICATION FOR EFFICIENT TELECOMMUNICATION NETWORKS PROVISIONING USING LINEAR PROGRAMMING

This paper presents a practical proposition for the application of the Linear Programming quantitative method in order to assist planning and control of customer circuit delivery activities in telecommunications companies working with the corporative market. Based upon data provided for by a telecom company operating in Brazil, the Linear Programming method was employed for one of the classical problems of determining the optimum mix of production quantities for a set of five products of that company: Private Telephone Network, Internet Network, Intranet Network, Low Speed Data Network, and High Speed Data Network, in face of several limitations of the productive resources, seeking to maximize the company’s monthly revenue. By fitting the production data available into a primary model, observation was made as to what number of monthly activations for each product would be mostly optimized in order to achieve maximum revenues in the company. The final delivery of a complete network was not observed but the delivery of the circuits that make it up, and this was a limiting factor for the study herein, which, however, brings an innovative proposition for the planning of private telecommunications network provisioning.

A callback mechanism for Private Telecommunications Networks

Private Telecommunications Networks (PTNs), such as enterprise telephony and Voice over IP (VoIP), have been widely deployed. A common limitation of PTNs is that PTN users are usually not assigned with Public Switched Telephone Network (PSTN) E.164 numbers. A PTN user is usually identified by an extension number or a URI (universal resource identifier). When a PTN user initiates a call to a PSTN user, it is not possible to use the PTN calling party’s identifier as the caller ID; instead, an E.164 number of the PBX or VoIP gateway is used. As a result, the PSTN called party cannot use the caller ID received to call back to the PTN calling party later, if the PTN user’s extension number or URI is unknown. This paper proposes a callback table approach to solve this problem. We describe how the call-out information is stored into and retrieved from a callback table maintained in the PBXs or VoIP gateways to provide callback service. Numeric analysis has been performed to evaluate the performance of this callback solution. The numeric results indicate that the callback method provides a satisfactory solution when there is sufficient voice traffic served by a VoIP gateway.

Designing an expert system for fraud detection in private telecommunications networks

Telecommunications fraud not only burdens telecom provider’s accountings but burdens individual users as well. The latter are particularly affected in the case of superimposed fraud where the fraudster uses a legitimate user’s account in parallel with the user. These cases are usually identified after user complaints for excess billing. However, inside the network of a large firm or organization, superimposed fraud may go undetected for some time. The present paper deals with the detection of fraudulent telecom activity inside large organizations’ premises. Focus is given on superimposed fraud detection. The problem is attacked via the construction of an expert system which incorporates both the network administrator’s expert knowledge and knowledge derived from the application of data mining techniques on real world data.

Design of Capacitated Multicommodity Networks with Multiple Facilities

This paper addresses the problem of designing a multicommodity network using several facilities with different costs and capacities. The problem is addressed in a special context of designing private telecommunications networks using Fractional-T1 services. The algorithm starts from any given solution of the problem and gradually improves it by solving a series of subproblems, arriving at a local minimum. The subproblem is defined over a subset of links, called the subnetwork, by using one of the links as the base link. It is shown that the subproblem can be formulated as a multiple choice knapsack problem that is solved by dynamic programming. Computational results and lower bounds are reported on problems of up to 20 nodes and up to 3 facilities. On most problems, the algorithm produces solutions within about 5% of lower bound on the average. Although it was not possible to compute lower bounds for larger problems, heuristic solutions and running times are reported for problems of up to 99 nodes and four facilities.

A state-wide senior parallel programming course

In this paper, we describe an undergraduate parallel programming course based upon networked workstations. The course is offered on the North Carolina Research and Education Network (NC-REN), a private telecommunications network which interconnects universities in North Carolina and provides multiway, face-to-face video, and audio communications. Course materials are described and made available in a new textbook. Topics are divided into basic techniques and applications. In addition, extensive home page materials are described.

1 network privatisation: The trend for the future

At the recent Financial Times Conference on Telecommunications and the European Business Market: the Perspectives for Change, two of the contributors examined the question of whether companies should “make” their own private telecommunications network, or “buy” a publicly-offered service. The topic is not only interesting as a case study of “make or buy”, but is especially timely in the specific field of telecommunications in Europe. In June 1987, the European Commission issued its Green Paper on telecommunications liberalisation and rationalisation of Europe's equipment manufacturers. Current difficulties include national regulatory powers, cross subsidies, lack of common standards, and lack of agreement on standards, frequencies and tariff principles. Not least, rapid changes in the technology itself has turned telecommunications into a Strategic competitive asset for companies. The two authors of these articles argue from slightly different perspectives; White as a major user developing into a provider, and Wilson as an adviser and provider. Both are convinced that the make or buy decision is an over-simplification; there are other, intermediate, options. Both agree that which ever decision is taken, it is likely to be the most important one in information technology that companies make in the next few years.

The CEGB corporate communications network

The CEGB operates a large private telecommunications network. This article briefly describes the network and examines some of the design considerations which are particularly influenced by the nature of the ESI's business

IPA — a processing architecture based on the ISO network reference model

IPA embodies ICL's strategy and plans for information processing over at least the next 10 to 20 years. It is not itself a product but a comprehensive and consistent set of systems concepts, design rules and function descriptions, together with specifications for interfaces and protocols, in accordance with which all existing software and hardware products will evolve and all new products will be developed. In broadest terms its objective is the provision of standard methods for linking together computers, computer systems and terminals via either public or private telecommunication lines or networks, extending to international linkings. The formal structure of IPA is based on the ISO seven-layered model for open systems interconnection. The paper explains the need for such an architecture, describes the essence of the ISO model and shows its close relation to the existing ICL communications architecture full XBM, from which IPA has evolved. The paper slows also how the principles of IPA can be implemented in various circumstances and describes some of the first products and user services which will be made available.

Current and medium term developments in switching

The current and medium term developments in switching are characterized by the extensive use of stored program control, digital switching and common channel signalling. In implementation terms, integrated circuit silicon semiconductor technology dominates. From the user’s viewpoint, these developments should result in large reductions in equipment size and procurement times, improved operational, maintenance and subscriber facilities, and an enhanced ability to cope with the evolving needs of both public and private telecommunication networks.

The use of operational research and systems analysis in decision making in Unilever

An organization as big as Unilever (1975 sales were £7000 million) needs to consider the balance of interest between shareholders, employees, customers, government and the environment. Many routine decisions are computerized and no longer of scientific interest. The talk will be concerned with some more complex problems. Decision trees are being used on investment and withdrawal problems. Systems analysis helps us to study the long-term effects of effluents on wild life in rivers. We have the world’s largest private telecommunications network so that managers can have access to current information and we have computer based financial models to enable us to explore the effects of decisions on cash and profit flows.