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Simple SNMP based optical power meter

Simple SNMP based optical power meter

引用

International Conference on Instrumentation Control and Automation (ICA)

作者： Karel Slavicek CESNET a.l.e Prague Czech Republic

cesnet is an association of universities and Academy of science of Czech Republic. It is operating a national research and education network (NReN) interconnecting all university cities in the republic. So called CeF - customer empowered fiber - is used on lot of cesnet backbone lines. In this paper we discus cesnet developed technology used to enlight leased dark fiber lines. We especially concentrate on the newly developed SNMP based power meter.

关键词： Optical amplifiers Integrated optics Stimulated emission Optical fiber amplifiers Calibration

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extending the reach of 10Ge at 1310 nm

Extending the reach of 10GE at 1310 nm

引用

International Conference on Transparent Optical Networks

作者： J. Vojtech M. Karasek J. Radil CESNET a.l.e Prague Czech Republic

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Web Deployed Interface for a Medical Knowledge Grid

Web Deployed Interface for a Medical Knowledge Grid

引用

International Conference on Internet and Web Applications and Services (ICIW)

作者： Martin Kuba Zora Sebestianova CESNET a.l.e Brno Czech Republic

We present our work on Web-deployed human interface for a knowledge grid intended for sharing medical knowledge. The grid allows medical specialists to provide their knowledge encapsulated as grid services, it allows the same or other medical specialists to easily locate the services, eventually build complex processing workflows from the services, and apply them to their data. everything is done in secure manner, which is crucial in medicine. The human interface has two parts - a Web interface for so called documentation service and a Web-deployed GUI interface for searching grid services and invoking grid workflows. As the grid connects experts from the whole world, a two-layered internationalization is an important feature.

关键词： Humans Ontologies Grid computing Supercomputers Drugs Publishing length measurement Documentation Graphical user interfaces Instruments

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Traffic classification for portable applications with hardware support

Traffic classification for portable applications with hardwa...

引用

Workshop on Intelligent Solutions in embedded Systems

作者： Petr Zejdl Sven Ubik Vladimir Macek Arne Oslebo UNINETT Norway CESNET a.l.e Czech Republic

Traffic filtering and classification is needed in many monitoring applications. To process large volumes of data, we need hardware support embedded in monitoring cards. The problem is that different cards have differe... 详细信息

关键词： Monitoring Hardware Filtering Software Band pass filters libraries Computer architecture

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TCI: A system for distributed network monitoring, troubleshooting and dataset creation

TCI: A system for distributed network monitoring, troublesho...

引用

Ieee Symposium on Network Operations and Management

作者： Dominik Soukup Jaroslav Pešek lukáš Hejcman David Beneš Tomáš Čejka Czech Technical University in Prague & CESNET a.l.e Prague Czech Republic CESNET a.l.e Prague Czech Republic

ISBN: (数字)9798350327939

ISBN: (纸本)9798350327946

Network traffic monitoring is a very complex task that requires a combination of multiple tools and teams. Very often, detected events must be validated and confirmed, or ongoing detection needs additional detailed data from full packets. All these activities must be done automatically concerning data privacy. This is why we propose a solution in the form of Traffic Capture Infrastructure (TCI), a single system for network traffic capture, investigation, and dataset creation, even in high-speed provider networks. Our system supports extensive user management features to ensure dataset privacy, system integrity, and unified control over many network probes. This paper presents the architecture, main functions, recommendations, and lessons learnt from full packet monitoring in today’s networks. lastly, we prove the value of this system with several publications that have used our system to create their underlying dataset and network traffic investigation.

关键词： Data privacy Telecommunication traffic Systems support Task analysis Probes Monitoring

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DMA Medusa: A Vendor-Independent FPGA-Based Architecture for 400 Gbps DMA Transfers

DMA Medusa: A Vendor-Independent FPGA-Based Architecture for...

引用

Annual Ieee Symposium on Field-Programmable Custom Computing Machines (FCCM)

作者： Jan Kubálek Jakub Cabal Martin Špinler Radek Iša CESNET a.l.e Prague Czech Republic

ISBN: (纸本)9781665435550;9781665402538

FPGA accelerator cards are used for packet capture and monitoring in high-speed networks. With the 400G ethernet technology, there is a need for an ability to transfer data to and from the host memory at the speed of 400Gbps. Currently available architectures (for example [1],[2],[3]) are limited to throughput up to 100Gbps and are therefore not suitable for this use *** paper presents a vendor-independent DMA architecture that is capable of scaling up to 400Gbps throughput in a single FPGA using two PCIe Gen4 ×16 slots bifurcated into four ×8 interfaces. This architecture is designed to support hundreds of independent DMA channels and supports one or more PCIe endpoints with different configurations. We also demonstrate the performance of the proposed DMA architecture using results measured on an accelerator card with Intel Stratix 10 DX FPGA.

关键词： High-speed networks Computer architecture ethernet Throughput Field programmable gate arrays Monitoring

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High Throughput and low latency lZ4 Compressor on FPGA

High Throughput and Low Latency LZ4 Compressor on FPGA

引用

International Conference on Reconfigurable Computing and FPGAs (ReConFig)

作者： Tomáš Beneš Matěj Bartík Pavel Kubalík CTU FIT & CESNET a.l.e CTU FIT

ISBN: (纸本)9781728119588

This paper presents an FPGA design implementing a single lZ4 lossless compression IP block, providing a throughput of 6 Gbps combined with extremely low latency, while still retaining full binary compatibility with the original lZ4 format. The best-known competitor is capable of processing up to 2 Gbps per block/engine with unknown latency. The presented design uses two key features: A low-latency 8-way match search unit and consequently a match buffer which allows encoding lZ4 sequences independently to reduce stalls in the data processing pipeline. The design was evaluated on several compression corpora with an average compression ratio of 1.7.

关键词： data compression field programmable gate arrays logic circuits microprocessor chips Field programmable gate arrays Microprocessor chips logic circuits Data compression compression ratio Throughput latency Gbps stalls(animals)

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Flow-based detection of IPv6-specific network layer attacks 11th

引用

11th IFIP WG 6.6 International Conference on Autonomous Infrastructure, Management, and Security, AIMS 2017

作者： Hendriks, luuk Velan, Petr Schmidt, Ricardo De O. Deboer, Pieter-Tjerk Pras, Aiko Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Enschede Netherlands CESNET a.l.e Zikova 4 Prague 6160 00 Czech Republic

ISBN: (纸本)9783319607733

With a vastly different header format, IPv6 introduces new vulnerabilities not possible in IPv4, potentially requiring new detection algorithms. While many attacks specific to IPv6 have proven to be possible and are described in the literature, no detection solutions for these attacks have been proposed. In this study we identify and characterise IPv6-specific attacks that can be detected using flow monitoring. By constructing flow-based signatures, detection can be performed using available technologies such as NetFlow and IPFIX. To validate our approach, we implemented these signatures in a prototype, monitoring two production networks and injecting attacks into the production traffic. © The Author(s) 2017.

关键词： Network layers

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Towards low-noise tunable THz generation

Towards low-noise tunable THz generation

引用

2023 International Topical Meeting on Microwave Photonics, MWP 2023

作者： Indra, Win Feng, Zitong Vojtech, Josef Ding, Meng Shi, Bo Slavik, Radan University of Southampton Optoelectronics Research Centre Southampton United Kingdom National Physical Laboratory Teddington United Kingdom CESNET A.l.e 160 00 Czech Republic

ISBN: (纸本)9798350342215

We phase locked a commercial telecom ITlA (integrable-Tunable-laser-Assembly) laser to an optical frequency comb with carrier frequency within the telecom C-band (1527 nm-1565 nm). We achieved short-Term integrated phase noise of 1.1 rad2 and long-Term frequency stability below ± 0.4 Hz. Fractional frequency instability for Terahertz source generated via photomixing of two such lasers is calculated and compared with the state-of-The-Art. © 2023 Ieee.

关键词： Frequency stability

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Compact and low-power comb-locked transmitter based on ITlA tuneable lasers 45

Compact and low-power comb-locked transmitter based on ITLA ...

引用

45th european Conference on Optical Communication, eCOC 2019

作者： Slavík, Radan Vojtech, Josef Ding, Meng Richardson, David J. Optoelectronics Research Centre University of Southampton SouthamptonSO17 1BJ United Kingdom CESNET a.l.e Praha 6160 00 Czech Republic

ISBN: (纸本)9781839531859

We suggest and demonstrate a radically new approach to generate frequency-locked optical carriers. It provides for a low-power-consumption, self-starting and stable fibre comb operating across the entire C-band. We phase lock commercially-available Integrated-Tunable-laser-Assembly (ITlA) lasers to the comb with arbitrary and fully tuneable spectral spacing. © 2019 Institution of engineering and Technology. All rights reserved.

关键词： Optical transmitters

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