Showing papers by "Jurgen Jasperneite published in 2012"

Approaches to reduce the latency for high priority traffic in IEEE 802.1 AVB networks

Abstract: The IEEE 802.1 Audio Video Bridging (AVB) standard is increasingly seen as a next generation real-time communication system for various application domains. The most important requirements are a short latency and a low jitter of the data transmission. One of the biggest impacts on the latency and the jitter of a reserved real-time stream is the interfering non real-time traffic. This paper presents some possible approaches under discussion within AVB community to mitigate the effect of such interference. A case study using one of the approaches is described and a simulation model is implemented as a proof of concept.

An FPGA based HSR architecture for seamless PROFINET redundancy

Abstract: This paper presents the mapping of the High-Availability Seamless Redundancy (HSR) protocol to PROFINET RT. Whereas common PROFINET RT components that implement the Media Redundancy Protocol (MRP) are requiring up to 200 ms for recovery after link failures, HSR provides seamless redundancy. In order to overcome the incompatibilities between PROFINET and HSR a configurable HSR RedBox is implemented. The hardware architecture, running at 100 MHz, is mapped onto an Altera Stratix IV FPGA and is capable of processing up to 100 Mbps per port. Using several RedBoxes in a ring, a seamless redundancy is demonstrated for a PROFINET RT test network, using 1 ms cycle time with 3 ms watchdog. The presented architecture is highly configurable and can be mapped both to high-end and low-end FPGAs and therefore fulfills industrial requirements.

An FPGA based approach for the enhancement of COTS switch ASICs with real-time Ethernet functions

Abstract: This paper presents an approach for the enhancement of standard switch ASICs with real-time Ethernet functions. Whereas a standard switch ASIC provides sophisticated mechanisms for switching of non real-time frames, an attached FPGA implements cut-through switching of real-time frames. The proposed FPGA architecture supports configuration of port numbers, bandwidth reservation for real-time frames and utilizes flow-control mechanisms of the ASIC in order to keep frame buffer sizes low. Mapping exemplary RTE extensions of PROFINET IRT onto a Xilinx Spartan 6 FPGA demonstrates the capability of providing band-width reservation and cut-through-forwarding of real-time frames. Therefore, the approach benefits from the innovations made by the switch manufacturers, whereas only a small amount of functions has to be mapped onto an FPGA.

Performance Evaluation of Cellular Communication Systems for M2M Communication in Smart Grid Applications

Abstract: The increasing power demands and growing awareness for sustainable and green energy has led to distributed generation of power from different sources. This transition from centralized to a distributed power generation has increased the necessity to upgrade the traditional grid. The future grid, i.e. Smart Grid, should offer two way flow of power and information. Smart grid needs to intelligently manage the power generation, transmission, and distribution to generate optimal power resources and adapt consumers to those power resources. In addition, it should support smart metering and monitoring to reduce energy consumption and cost. This intelligent management demand near real time communication between the power generators, consumer utilities and the control center. Thus machine-to-machine (M2M) communication is the necessity of future smart grid applications.

Sicherheits- und Datenschutzanforderungen an Smart Grid-Technologien

Abstract: Kunftige Smart Grids stellen hochgradig vernetzte Systeme mit einem prognostizierten Umfang des heutigen Internets dar. Hierbei wird Automatisierungs- und Kommunikationstechnik eingesetzt, die neue Herausforderungen bezuglich Datensicherheit- und Datenschutz zu erfullen hat. Dieser Beitrag zeigt die Anforderungen an IKT-Systeme fur ein zukunftiges heterogenes, dezentrales und intelligentes Energiesystem unter Berucksichtigung aktueller und zu erwartender Datensicherheits- und Datenschutzanforderungen auf.