The mission of the European Bioinformatics Institute (EBI), an outstation of the European Molecular Biology Laboratory (EMBL) in Heidelberg, is to ensure that the growing body of information from molecular biology and genome research is placed in the public domain and is accessible freely to all parts of the scientific community in ways that promote scientific progress. To fulfil this mission, the EBI provides a wide variety of free, publicly available bioinformatics services. These can be divided into data submissions processing; access to query, analysis and retrieval systems and tools; ftp downloads of software and databases; training and education and user support. All of these services are available at the EBI website: http://www.ebi.ac.uk/services. This paper provides a detailed introduction to the interactive analysis systems that are available from the EBI and a brief introduction to other, related services.
This paper describes the electrical architecture and design of the IBM eServere BladeCentert midplane and media interface card. The midplane provides the redundant interconnects among processor blades, switch modules, media interface card, and management modules. It also serves as the redundant power distribution medium from the power modules to all blades and other devices. A major attribute of the BladeCenter electrical design is the redundant nature of the interconnects, which gives this product superior reliability and availability. The media interface card provides the interface between the CD-ROM and floppy disk drives and the blades that share these devices. The sharing of these devices was a key BladeCenter innovation. Also, to ensure that the architecture will be flexible enough to support multiple input/output fabric protocols, SerDes (serialized/deserialized) is used as the internal high-speed communication electrical interface. Since highspeed designs can easily result in higher implementation costs, a significant predesign simulation effort was undertaken to analyze and prioritize design guidelines in order to develop a high-speed midplane at a competitive cost. This paper highlights how we reduced board costs by finding solutions that overcame some of the challenges of 2.5-Gb/s data transmission over multiple printed circuit boards and connectors.
The goal of this paper is to describe some of the design choices made in a BladeCenter system design. This paper will focus on the connector modeling that was used to make design trade-offs, unique to a 1OGbps serial system. Connectors are a significant source of crosstalk noise in a system, which could increase jitter in the resulting eye pattern. Since crosstalk jitter is uncorrelated from the link data pattern, it is hard to remove through equalization techniques. This paper provides a process to extract accurate coupled models from connectors. It also describes how modeling was used to predict crosstalk noise and shows how a small percentage of connector crosstalk can have a significant impact on the over all signal distortion, if the connector pin assignment is done randomly IntroductionDesign choices in a Blade Center backplane system are based on simulation models. Accurate simulation models are critical to making good design trade-offs, especially in 1OGbps serial systems. Typically, models for several components provided by external suppliers have limited accuracy. As serial link speeds have increased, minimizing crosstalk has become a major Signal Integrity challenge. In a 1OGbps system connector crosstalk can be a significant jitter contributor if the connector pin assignment is done randomly. However, the effect on the overall system can be reduced by following certain design guidelines.This paper provides a process to extract accurate connector crosstalk models. The Molex SEARAYTM connector was evaluated to determine its suitability in the high speed backplane system. As shown in Figure 1 below, the BladeCenter interconnects are card to card high speed channels, which enable system compatibility between shared devices. The backplane in a blade system can be defined as a flexible interface to attach shared devices such as processor blades, switches, management modules, etc.Two different techniques were used to measure the near end and far end crosstalk contribution of the connector. The correlation of crosstalk measurement techniques was done using a VNA in the Frequency domain and a TDR in the Time domain. This procedure validated the connector crosstalk measurements, which with a high confidence to see the impact of connector cross talk.In addition to characterizing the crosstalk contribution of the connector by itself, a channel simulation using the StatEye tool was performed using the validated coupled models that were created by exporting measured frequency domain data into the touchstone format.
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