The plan of transmission parameters or the network plan was created for Czech Republic in 2005 and this plan has had key effect on traffic in the telecommunication networks providing public telephone service, including mobile networks, NGN networks based on IP protocol and private networks connected to public telephone network. This paper describes practical effects of aforesaid plan on some ty...

High capacity networks are needed for enormous quantity of internet traffic, which is driven by both the exponential growth number people using and ongoing introduction new high-bandwidth requiring applications. Combining optical wireless technologies a promising access network solution. The energy efficiency telecommunication therefore attracting increasing attention today than in past. This s...

Due to the importance that mobile telecommunication systems are assuming in voice networks, this paper addresses the problem of modelling the traffic that characterizes cellular systems. Starting from experimental data provided by a mobile telecom operator, the two aspects of interarrival times and holding times of voice calls are considered. For each of them a study is carried out to find the ...

Protecting our critical infrastructures like energy generation and distribution, telecommunication, production and traffic against cyber attacks is one of the major challenges of the new millennium. However, as security is such a complex and multilayer topic often the necessary structured foundation is missing for a manufacturer to assess the current security level of a system. This paper intro...

We show how the Murφ model checker can be used to automatically carry out safety analysis of a quite complex hybrid system tele-controlling vehicles traffic inside a safety critical transport infrastructure such as a long bridge or a tunnel. We present the Murφ model we developed towards this end as well as the experimental results we obtained by running the Murφ verifier on our model. Our expe...

The modern high-speed network traffic exhibits the self-similarity. The degree of selfsimilarity is measured by the Hurst parameter. In this paper are used two graphical techniques for estimating Hurst parameter of pseudo-random self-similar sequences, based on the fractional Gaussian noise (FGN) method. The analyses show that the FGN method always produces self-similar sequences, with relative...

Both industry and the academic world are becoming more and more interested in techniques to model, analyse, and control complex systems that contain both analog and logical components. Such systems are called hybrid systems. Examples of hybrid systems are telecommunication networks, flexible production systems, parallel processing systems, traffic networks, and so on. In this paper we present a...

ABSTRACT : With the rapid development of information technology, internet has affect the people in all aspects such as public utilities, telecommunication, financial transaction and defense system, all depends on information technology and their security. The widespread deployment of new technologies had maximized the use of internet to a great extent. But at the same time, the potential attack...

The classical Erlang and Engset loss models have been used extensively in the traffic engineering of traditional telephone exchanges. More recently, these models have been generalized to the so-called loss networks, which provide models for resource sharing in multiservice telecommunication networks. In this paper, we introduce a new generalized class of models, queueing-loss networks, which ca...

Due to the increase in traffic volume and service diversity in telecommunication networks, efficient processing of calls and signalling functions in digital exchanges is becoming crucial to the operation of such networks. This paper describes a hierarchical model of the control system in an exchange. The model is represented as an M/G/1 queueing network and it is used for investigation of syste...