ATM interworking unit with ISDN and ethernet interfaces

The convergence of telecommunications and computer communication technologies requires the development of Interworking Units to convert different data formats, protocols and control procedures. This paper describes the architecture of an electronic device, which is able to perform interworking functionalities between ATM, ISDN and Ethernet networks and presents several scenarios for interconnection environments

Electronic and photonic switching in the atm era

Broadband networks require high-capacity switches in order to properly manage large amounts of traffic fluxes. Electronic and photonic technologies are being used to achieve this objective both allowing different multiplexing and switching techniques. Focusing on the asynchronous transfer mode (ATM), the inherent different characteristics of electronics and photonics makes different architectures feasible. In this paper, different switching structures are described, several ATM switching architectures which have been recently implemented are presented and the implementation characteristics discussed. Three diverse points of view are given from the electronic research, the photonic research and the commercial switches. Although all the architectures where successfully tested, they should also follow different market requirements in order to be commercialised. The characteristics are presented and the architectures projected over them to evaluate their commercial capabilities.Peer ReviewedPostprint (published version

ACSys/RDN experiences with Telstra’s experimental broadband network, first progress report

This report summarises our experiences with the EBN and provides an indication of where we are now. We don’t present a set of detailed performance measurements in this report, instead we focus primarily on bandwidth utilisation and network management. We are currently producing a more comprehensive set of performance measurements, which will be presented in a subsequent report

Quality of Service over Specific Link Layers: state of the art report

The Integrated Services concept is proposed as an enhancement to the current Internet architecture, to provide a better Quality of Service (QoS) than that provided by the traditional Best-Effort service. The features of the Integrated Services are explained in this report. To support Integrated Services, certain requirements are posed on the underlying link layer. These requirements are studied by the Integrated Services over Specific Link Layers (ISSLL) IETF working group. The status of this ongoing research is reported in this document. To be more specific, the solutions to provide Integrated Services over ATM, IEEE 802 LAN technologies and low-bitrate links are evaluated in detail. The ISSLL working group has not yet studied the requirements, that are posed on the underlying link layer, when this link layer is wireless. Therefore, this state of the art report is extended with an identification of the requirements that are posed on the underlying wireless link, to provide differentiated Quality of Service

ACSys/RDN experiences with Telstra’s experimental broadband network, second progress report

This report addresses three issues relevant to DHPC network infrastructure requirements:. · Technically, what we can currently achieve with the EBN? · What are desirable qualities in future ATM networks? · What further development of the EBN would we like to see for other applications? In writing this report, we will briefly describe the EBN ATM experience of ACSys’ Distributed High Performance Computing Project and Digital Media Libraries project, explain some of the technology and networking issues we have dealt with and summarise what we have learned. We have also included some background material on the EBN and ATM networks in general

Controle de acesso para gerência de segurança de redes virtuais emuladas

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico.Visando incrementar a segurança no ambiente de redes virtuais emuladas, este trabalho apresenta procedimentos de controle de acesso para prevenir e reagir a diversos tipos de ameaças. O estudo apresenta três categorias de ameaças ao serviço de LAN Emulation (LANE): Confidencialidade, Integridade e Disponibilidade. Também descreve as políticas de segurança estabelecidas pelo ATM Forum, as quais foram avaliadas por meio de experimentos. Os experimentos foram realizados em uma rede que possui backbone ATM e sub-redes Ethernet. Com base nas ameaças, foram definidos procedimentos de controle de acesso usando as políticas de segurança e atributos de controle do próprio equipamento. Esses procedimentos de controle são implementados pelo gerenciamento Simple Network Managament Protocol (SNMP), o qual utiliza regras de produção para tomada de decisão

Multi-protocolos sobre ATM, interoperabilidade e gerência: um estudo de caso

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Computação.Este trabalho consiste no estudo e na realização de experimentos com o Multi-Protocolo sobre ATM. São apresentados testes de interoperabilidade entre equipamentos com suporte a MPOA de diferentes fabricantes. Nos experimentos de conformidade as características dos equipamentos são confrontadas com as declarações de conformidade da implementação do protocolo MPOA. Para mostrar os benefícios do MPOA, foi implementado um ambiente de teste especifico para realizar experimentos de avaliação de desempenho em ambientes

Using Quality of Service can be simple: Arequipa with Renegotiable ATM

We have modified the popular Mbone toolVic (VIdeo-Conferencing) to use Arequipa (Application REQuested IP over ATM). The latter enables applications and in particular Vic, to request a direct ATM connection for its exclusive use and to directly control the traffic parameters of this connection. We have also implemented ATM Forum's UNI4.0 signaling and ITU-T's connection modification recommendation Q.2963.1, on end-systems as well as on switches. This implementation, coupled with the Arequipa mechanism, allowed Vic to negotiate and renegotiate ATM bandwidth at will, at run time. We describe how Vic accomplished that over the ATM WAN of SWISSCOM, transferring live video from Lausanne to Basel and Zurich over switched, renegotiable ATM connections. To our knowledge, this was the first time any application had the capacity to tune ATM traffic parameters at run time. Keywords: ATM, Arequipa, QoS, signaling, renegotiation, Vi

Avaliação das propostas de integração IP sobre ATM

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência da Computação.ATM (Asynchronous Transfer Mode) é uma das tecnologias de rede de alta velocidade mais adotada nos dias atuais, sendo que um dos principais diferenciais desta tecnologia é o provimento de Qualidade de Serviço. Atualmente, a tecnologia ATM deve conviver com o protocolo IP, devido principalmente ao grande volume de aplicações. Existem algumas alternativas em termos de integração do IP com ATM, por exemplo IPOA (Internet Protocol Over ATM), LANE (Lan Emulation), MPOA (MultProtocol Over ATM) e MPLS (MultProtocol Label Switch). Este trabalho apresenta estas propostas de integração IP sobre ATM, fazendo também uma análise comparativa. Outra contribuição deste trabalho é a definição de linhas guias para a seleção de uma destas opções de integração de IP sobre ATM durante o projeto de uma rede