1,720,973 research outputs found
P4-based Telemetry Processing for Fast Soft Failure Recovery in Packet-Optical Networks
Full text linkA novel framework for in-network P4 processing of distributed multi-layer telemetry data is presented, enabling effective soft failure detection and recovery strategies enforced in just a few microseconds
Telemetry and AI-based security P4 applications for optical networks [Invited]
No full textThis paper presents the potentials and challenges of programmable packet-optical nodes encompassing coherent pluggable modules applied in the context of optical metro networks. Two innovative applications of P4-based data plane programmability are then presented. The first targets the monitoring and processing of optical telemetry data/metadata directly in the forwarding plane. The second one focuses on the deployment of deep neural networks in P4 chipsets, effectively supporting in-network distributed cyber security functionalities in packet-optical nodes
Enabling hierarchical control of coherent pluggable transceivers in SONiC packet–optical nodes
Full text linkTraditional metro networks are composed of packet switching nodes (i.e., routers) interconnected by optical transport links. In this scenario, the packet and optical domains are clearly separated, using dedicated controllers. Standalone muxponders/transponders will be replaced in optical metro and transport networks by the utilization of hybrid packet-optical nodes equipped with coherent pluggable transceivers. Thus, the traditional packet control plane is unable to manage and fully support the specific optical parameters required to configure such pluggable modules. Moreover, the coordination between the optical and packet layers within this hybrid node has not been standardized yet and requires careful design to enable effective management of connectivity services. This paper proposes two software-defined networking (SDN)-based hierarchical solutions to coordinate and control coherent pluggable transceivers in a multi-layer network exploiting hybrid packet-optical nodes. The two solutions have been designed and validated focusing on the pluggable module configuration and the communication within the SDN hierarchical architecture. An experimental testbed including two packet-optical nodes, running an extended version of the open-source Software for Open Networking in the Cloud (SONiC) operating system, is deployed to show the effectiveness of the two solutions, with a deep analysis of the time required to set up end-to-end connections spanning the packet and optical domains
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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