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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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Towards low-noise tunable THz generation

Towards low-noise tunable THz generation

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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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Coherent Data System and Slow Data Transmission in a Single Fiber with ITU Grid Spacing 13

Coherent Data System and Slow Data Transmission in a Single ...

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Optical Modeling and Performance Predictions XIII 2023

作者： Horvath, Tomas Sima, Jaromir Radil, Jan Vojtech, Josef Brno University of Technology Department of Telecommunications Technicka 12 Brno Czech Republic CESNET a.l.e Department of Optical Networks Generala Piky 26 Prague Czech Republic University of South Bohemia in Ceske Budejovice Branisovska 31a Ceske Budejovice Czech Republic

ISBN: (纸本)9781510665422

In the period following the COVID-19 outbreak, there continues to be a demand for high-speed data services and sufficient bandwidth. From a transport network perspective, a coherent system transmits data independent of the specific transmission wavelengths . However, it is desirable to address the transmission of slow signals (e.g., OOK) in the same fiber and their interaction between transmissions. Here, we assess the effect of a slow signal with a low modulation rate in a DWDM network on high-speed (super channel) 800G transmission. To evaluate the effect on high-speed transmission, the Q factor and eSNR parameters provided by the Ciena transmission system were analyzed. For the test setup and the combination of the coherent 800G signal with the standard DFB transceiver signal and 100 GHz spacing. The 800G signal required 112 GHz bandwidth for its transmission. For a path length of 200 km and for modulation rates of the OOK signal ranging from 100 Mbit to 4 Gbit, we found no significant effect on the evaluated parameters of the Q factor and eSNR of the transmitted 800 G signal. The more significant effect on the 800G signal is, the mutual power level of neighboring channels with different modulation types. To limit the mutual influence of adjacent signals, these signals must also be balanced according to their maximum (peak) power level in the transmitted spectrum. © 2023 SPIe.

关键词： Bandwidth

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Towards low-noise tunable THz generation

Towards low-noise tunable THz generation

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International Topical Meeting on Microwave Photonics (MWP)

作者： Win Indra Zitong Feng Josef Vojtěch Meng Ding Bo Shi Radan Slavík Optoelectronics Research Centre University of Southampton Southampton UK National Physical Laboratory Teddington UK CESNET a.l.e Czechia

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 rad 2 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.

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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...

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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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living lab long-Term Sustainability in Hybrid Access Positive energy Districts - A Prosumager Smart Fog Computing Perspective

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Ieee Internet of Things Journal 2023年第21期10卷 18898-18908页

作者： Vohnout, Rudolf Bukovsky, Ivo Chou, Shuo-Yan Geyer, Jakub Budik, Ondrej Sharma, Rohit Prokysek, Milos Horvath, Tomas Wyckmans, Annemie University of South Bohemia in České Budějovice Faculty of Science Department of Computer Science České Budějovice37005 Czech Republic National Taiwan University of Science and Technology Department of Industrial Management Taipei106 Taiwan SRM Institute of Science and Technology NCR Campus Department of Electronics and Communication Engineering Ghaziabad201204 India Brno University of Technology Department of Telecommunications Brno61600 Czech Republic CESNET a.l.e Department of Optical Networks Prague16000 Czech Republic NTNU-Norwegian University of Science and Technology Department of Architecture and Planning Trondheim7491 Norway

living lab, one of the recent emerging smart city concepts, faces long-term sustainability challenges associated with its complexity and breadth of use. To be efficient, it must rely on comprehensive set of information distributed appropriately among all stakeholders to unleash its full innovation potential. This is especially true in the case of positive energy districts (PeDs), where timely data dissemination is essential for prosumager decisions and their greedy behavior. This article interconnects intelligent information exchange, supported by ultralow latency hybrid access network infrastructure, with the clever use of available fog computing resources to properly disseminate complex energy details to all participating entities. As the optimal task offloading for effective information distribution constitutes the convergence problem, we reintroduced higher order neural units. These units contribute to sustaining both computational and energy efficiency, as well as the balance of the entire system. We have achieved a reliable hourly energy consumption prediction with a computationally very lightweight alternative to commonly used deep neural network approaches that can be deployed on available smart appliances with ease. The application and simulation were performed on the data set provided by one of europe's smart city pioneers, where the prosumager PeD transition has already started. © 2023 Ieee.

关键词： Decision making

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High Throughput and low latency lZ4 Compressor on FPGA

High Throughput and Low Latency LZ4 Compressor on FPGA

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2019 International Conference on Reconfigurable Computing and FPGAs, ReConFig 2019

作者： Benes, Tomas Bartik, Matej Kubalik, Pavel CTU FIT CESNET A.l.e CTU FIT

ISBN: (纸本)9781728119571

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. © 2019 Ieee.

关键词： Pipelines

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High-speed stateful packet classifier based on TSS algorithm optimized for off-chip memories

High-speed stateful packet classifier based on TSS algorithm...

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Ieee Design and Diagnostics of electronic Circuits and Systems (DDeCS)

作者： Michal Orsák Tomáš Beneš Faculty of Information Technology Brno University of Technology Brno Czech Republic Faculty of Information Technology Czech Technical University Prague Czech Republic CESNET a.l.e Prague Czech Republic

We present a modular out-of-order architecture for stateful packet classification. The architecture uses DDR4 SDRAM memory to store rules and their state information to support millions of rules. The memory access pattern generated by network traffic significantly degrades the performance of the DDR4. Our architecture contains a cache and aggregation queues to negate this effect. Additionally, the memory subsystem supports a read cancellation and uses an out-of-order pipeline to maximize the main memory's effectiveness further. The rule set update is implemented as a non-blocking operation and can be interleaved with lookup operations without any performance decrease, leading to the same execution time for rule update and rule lookup. The architecture is optimized for the modern datacenter's network traffic and a small on-chip memory footprint, making it suitable as an accelerator for the Open vSwitch. As a result, our novel architecture configured with 1 million exact match rules can process traffic up to 202 Gbit/s (300 Mp/s) in average case and 51 Gbit/s (76 Mp/s) in the worst case with the use of a common dual-channel 64 bit DDR4-2666 MHz. It uses fewer FPGA resources (excluding cache memory) than the well-known de facto industry standard Xilinx MIG DDR4 controllers. Our proposed architecture enables commodity FPGA cards commonly equipped with DDR4 to process 100 Gbit/s which results in a significant cost reduction of a 100G SmartNICs.

关键词： Out of order Ports (computers) Pipelines Telecommunication traffic Throughput Hardware System-on-chip

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Comb-locked telecom-grade tunable laser using a low-cost FPGA-based lockbox

Comb-locked telecom-grade tunable laser using a low-cost FPG...

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Conference on lasers and electro-Optics (CleO)

作者： Zitong Feng Alex Tourigny-Plante Josef Vojtěch Jérôme Genest David J. Richardson Radan Slavík Optoelectronics Research Centre University of Southampton Southampton UK Centre d’Optique Photonique et Laser Universite Laval Québec QC Canada CESNET a.l.e Praha 6 Czech Republic

We frequency locked a commercial ITlA (integrable-tunable-laser-assembly) laser to an optical frequency comb with arbitrary carrier frequency within the telecom l band (1570-1625 nm). We achieved long-term (days) freq... 详细信息

ISBN: (纸本)9781943580910

关键词： lasers and electrooptics laser stability Optical harmonic generation Telecommunications electrooptical waveguides

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High Throughput and low latency lZ4 Compressor on FPGA

High Throughput and Low Latency LZ4 Compressor on FPGA

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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

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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