1,743,893 research outputs found

    Actes de la seconde seance des Estats generaux de France, tenus à Blois, le mardy XVIII du mois d'octobre, 1588

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    [Actes. 1588-10-18. Blois]Appartient à l’ensemble documentaire : Centre1Ouvrages avant 180

    Tableau chronologique : 1585-1588

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    Schrenck Gilbert. Tableau chronologique : 1585-1588. In: Albineana, Cahiers d'Aubigné, 2, 1990. D’Aubigné et les guerres poitevines (1586-1588) sous la direction de Marie-Madeleine Fragonard. pp. 21-22

    Grec 1588

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    Numérisation effectuée à partir d'un document original : Grec 1588.Synaxarium septembris-julii, 28Colbert. 371

    The Impact of Network Latency on the Synchronization of Real-World IEEE 1588-2008 Devices Using 1588 and non-1588 Aware Switches

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    Precision Time Protocol (PTP) is a high precision time synchronization protocol designed to operate over a local area network. PTP, often referred to as 1588, is defined by the IEEE Standard 1588(TM)-2008. The protocol theoretically allows synchronization at the nanosecond level. New devices with support for 1588 are emerging into the market, but there have been few studies on real 1588 devices. Our research was broken into two parts: Phase 1 and Phase 2. Phase 1 studied performance of the protocol in an environment where two 1588 devices are connected via a network in which impairments that are typically observed in real networks are introduced and non-1588 devices are present. Measuring the Pulse-Per-Second (PPS) clock outputs of the 1588 boards, we were able to calculate the standard deviation and the mean synchronization error of the 1588 clocks. When we applied latency via network emulators and traffic generators between the 1588 connections, we found that 1588 boards were unable to maintain high accuracy time synchronization under variable and asymmetric latency. The results provide valuable insight into the real-world accuracy and robustness because it is rare that a network will contain neither variable or asymmetric latency. In Phase 2 we studied the impact of latency and high-bandwidth background traffic on 1588 clock synchronization when connected through 1588 and non-1588 aware switches. We found that 1588 aware switches provide higher precision time synchronization in small networks; but in large networks where congestion is present 1588 aware switches were unable to maintain high accuracy clock synchronization without prioritization. Our results also show that having cut-through Enterprise Ethernet switches connected to high congestion endpoints with priorities enabled is adequate for maintaining sub-microsecond synchronization performance

    Mar di India [cartographic material].

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    Map of the Indian Ocean and surrounding countries ; Australia called Terra Del Zur. Relief shown pictorially.; Scale : Milliaria Germanica comm.; On verso: Mar d'India, oder das ost-Indische meer ... In German, black type, 2 column text with ornate initial. Printed marginal headings.; Title in cartouche.; From: Atlantis majoris... Amstelodami : Apud Ioannem Ianssonium, 1650.; Tooley, 1564.; Koeman's Atlantes Neerlandici, 1:426.5M, O & T (7) Y.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-t1564; Exhibited in online exhibition: 34zBSouth Land to New Holland"34y Bat http://www.nla.gov.au/exhibitions/southland/ ANL

    Polus Antarcticus [cartographic material] /

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    Corners are filled with native scenes, including animals, birds, boats and a representation of a penguin and of a penguin being hunted. Title in cartouche.; From: Het vijfde deel des grooten atlas... / Ioannem Ianssonium. 1650.; Hemispherical map, with notes, centred on the South Pole to the Tropic of Capricorn; includes southern parts of South America and South Africa and the west and south coasts of Australia. Relief and vegetation shown pictorially.; On verso: Beschryvinge van de Zvyder Pool. Dutch language, black type, 2 column text with ornate initial. Printed marginal headings.; At centre of map: Terra Australis Incognita.; Koeman, Me 168.; Tooley 729.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-t729

    IX A 1 - Alte Stadtrechnungen (1587 - 1588)

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    IX A 1 - ALTE STADTRECHNUNGEN (1587 - 1588) IX A 1 - Alte Stadtrechnungen (1587 - 1588) ( -

    Polus Antarcticus [cartographic material] /

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    Hemispherical map, with notes, centred on the South Pole to the Tropic of Capricorn; includes southern parts of South America and South Africa and the west and south coasts of Australia. Relief and vegetation shown pictorially.; Corners are filled with native scenes, including animals, birds, boats and a representation of a penguin and of a penguin being hunted. Title in cartouche.; At centre of map: Terra Australis Incognita.; From: Atlas novus / Johannes Janssonius and Hernricus Hondius. Amsterdami, 1638.; Koeman/van der Krogt, 1:401.3A (98) 5G; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-rm85
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