Theodoros Karounos was born in Barsinikos a town near Mystras, Greece in 1953, studied in the Technical School of Sivitanidios and received his High School Diploma from the High School Equivalency Program of the State University of New York, completed the School of Contemporary studies of the City University of New York in 1979, received his B.Sc. in Computer Science in 1983 and the M.Sc. Degree in Information
We present an SNMP-based MIB for storing and updating management information in a Narrow-Band ISD... more We present an SNMP-based MIB for storing and updating management information in a Narrow-Band ISDN computer interface (ISDN controller). The ISDN Controller MIB has two major parts, the telecommunicatio ns part, which enables the manager to control and monitor the ISDN connections, and the data communications part, oriented to the monitoring and control of the data exchange over the ISDN network. The MIB is divided into three groups: the controller group, that contains general information about the controller; the port group, that contains cumulative information about the connections established over a single B- Channel; and the connection group, that contains information about the established connections. Apart from the specification of the MIB, we examine possible ways of accomplishing the physical connection between the manager and the SNMP agents, since the use of the ISDN network is not cost-efficient for the transmission of management information.
The work reported in this paper is part of RACE II Project 2037 (Distributed Documenting Services... more The work reported in this paper is part of RACE II Project 2037 (Distributed Documenting Services - DIDOS), partially funded by the Commission of the European Union (CEU) The project objectives are to demonstrate the feasibility of distributed service management, enhance the use of Pan-European ISDN and motivate the deployment of Integrated Broadband Communications (IBC or B-ISDN) in Europe. The concepts are being tested in three multi-national "Application Pilots" within the business sector of electronic Technical Documentation (TD). All users that participate in the project (TD producers and service providers) are interconnected via ISDN in a "Distributed Service Centre." Participants are equipped with a Service Management kernel that performs basic "agent" functions and a user access shell, including directory and administration services. In the paper we outline a Reference Platform that evolved within the project, formalise user and functional requi...
ABSTRACT In this paper, we address the congestion problems occurring at high speed networks, main... more ABSTRACT In this paper, we address the congestion problems occurring at high speed networks, mainly because of digital image transfer. Such problems can be efficiently solved only by proper design and intelligent management of the related networks. To that end, we present a traffic source and network model of a typical Picture Archiving and Communication System (PACS), useful for a performance evaluation during the design phase. We proceed gradually from a simple to a complex source model, and present results and conclusions based on simulation studies of the system. Analytical solutions to the problem are also presented to complement time consuming simulations. We handle firstly the communication network as a queueing system, with Poisson image arrivals and constant service time. Next, we consider the case of finite buffers, necessary for realistic dimensioning. From the network management point of view, we specify "agent" objects, (extensions to standard Management Information Bases, MIBs), giving network management the possibility of monitoring and controlling the PACS environment. These objects are functional aggregates of variables such as the number of image servers and image display workstations, the mean value and the distribution of the image size, the capacity of the transport network, buffer sizes, etc.
ABSTRACT We present an SNMP-based MIB for storing and updating management information in a Narrow... more ABSTRACT We present an SNMP-based MIB for storing and updating management information in a Narrow-Band ISDN computer interface (ISDN controller). The ISDN Controller MIB has two major parts, the telecommunications part, which enables the manager to control and monitor the ISDN connections, and the data communications part, oriented to the monitoring and control of the data exchange over the ISDN network. The MIB is divided into three groups: the controller group, that contains general information about the controller; the port group, that contains cumulative information about the connections established over a single BChannel; and the connection group, that contains information about the established connections. Apart from the specification of the MIB, we examine possible ways of accomplishing the physical connection between the manager and the SNMP agents, since the use of the ISDN network is not cost-efficient for the transmission of management information. KEY WORDS: N-ISDN Contr...
We present an SNMP-based MIB for storing and updating management information in a Narrow-Band ISD... more We present an SNMP-based MIB for storing and updating management information in a Narrow-Band ISDN computer interface (ISDN controller). The ISDN Controller MIB has two major parts, the telecommunicatio ns part, which enables the manager to control and monitor the ISDN connections, and the data communications part, oriented to the monitoring and control of the data exchange over the ISDN network. The MIB is divided into three groups: the controller group, that contains general information about the controller; the port group, that contains cumulative information about the connections established over a single B- Channel; and the connection group, that contains information about the established connections. Apart from the specification of the MIB, we examine possible ways of accomplishing the physical connection between the manager and the SNMP agents, since the use of the ISDN network is not cost-efficient for the transmission of management information.
The work reported in this paper is part of RACE II Project 2037 (Distributed Documenting Services... more The work reported in this paper is part of RACE II Project 2037 (Distributed Documenting Services - DIDOS), partially funded by the Commission of the European Union (CEU) The project objectives are to demonstrate the feasibility of distributed service management, enhance the use of Pan-European ISDN and motivate the deployment of Integrated Broadband Communications (IBC or B-ISDN) in Europe. The concepts are being tested in three multi-national "Application Pilots" within the business sector of electronic Technical Documentation (TD). All users that participate in the project (TD producers and service providers) are interconnected via ISDN in a "Distributed Service Centre." Participants are equipped with a Service Management kernel that performs basic "agent" functions and a user access shell, including directory and administration services. In the paper we outline a Reference Platform that evolved within the project, formalise user and functional requi...
ABSTRACT In this paper, we address the congestion problems occurring at high speed networks, main... more ABSTRACT In this paper, we address the congestion problems occurring at high speed networks, mainly because of digital image transfer. Such problems can be efficiently solved only by proper design and intelligent management of the related networks. To that end, we present a traffic source and network model of a typical Picture Archiving and Communication System (PACS), useful for a performance evaluation during the design phase. We proceed gradually from a simple to a complex source model, and present results and conclusions based on simulation studies of the system. Analytical solutions to the problem are also presented to complement time consuming simulations. We handle firstly the communication network as a queueing system, with Poisson image arrivals and constant service time. Next, we consider the case of finite buffers, necessary for realistic dimensioning. From the network management point of view, we specify "agent" objects, (extensions to standard Management Information Bases, MIBs), giving network management the possibility of monitoring and controlling the PACS environment. These objects are functional aggregates of variables such as the number of image servers and image display workstations, the mean value and the distribution of the image size, the capacity of the transport network, buffer sizes, etc.
ABSTRACT We present an SNMP-based MIB for storing and updating management information in a Narrow... more ABSTRACT We present an SNMP-based MIB for storing and updating management information in a Narrow-Band ISDN computer interface (ISDN controller). The ISDN Controller MIB has two major parts, the telecommunications part, which enables the manager to control and monitor the ISDN connections, and the data communications part, oriented to the monitoring and control of the data exchange over the ISDN network. The MIB is divided into three groups: the controller group, that contains general information about the controller; the port group, that contains cumulative information about the connections established over a single BChannel; and the connection group, that contains information about the established connections. Apart from the specification of the MIB, we examine possible ways of accomplishing the physical connection between the manager and the SNMP agents, since the use of the ISDN network is not cost-efficient for the transmission of management information. KEY WORDS: N-ISDN Contr...
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Papers by Θόδωρος Γ. Καρούνος