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  • × theme_ss:"Datenfernübertragung"
  1. Denenberg, R.: Data communications and OSI (1990) 0.01 
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    Source
    Library hi tech. 8(1990) no.4, S.15-32
    Year
    1990
  2. Rose, M.T.: ¬The open book : a practical perspective on OSI (1990) 0.00 
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    Year
    1990
  3. Heijer, P.C. den; Tolsma, R.: DFÜ: Daten-Fernübertragung : vom Akustikkoppler bis zum lokalen Netzwerk (1990) 0.00 
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    Year
    1990
  4. Mochmann, E.: Moderne Netzwerke zur nationalen und internationalen Datenkommunikation (1990) 0.00 
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    Year
    1990
  5. Löns, K.: Datenkommunikation (1990) 0.00 
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    Year
    1990
  6. LeVan, R.R.: Dublin Core and Z39.50 (2001) 0.00 
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    Footnote
    Teil eines Themenheftes: OCLC and the Internet: An Historical Overview of Research Activities, 1990-1999 - Part II
  7. Hickey, T.B.: ¬A Java Z39.50 Client for Browsing Large Databases (2001) 0.00 
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    Footnote
    Teil eines Themenheftes: OCLC and the Internet: An Historical Overview of Research Activities, 1990-1999 - Part II
  8. Deussen, N.: Sogar der Mars könnte bald eine virutelle Heimat bekommen : Gut 4,2 Milliarden sind nicht genug: Die sechste Version des Internet-Protokolls schafft viele zusätzliche Online-Adressen (2001) 0.00 
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    Abstract
    Der Geniestreich aus dem Europäischen Labor für Teilchenphysik (Cern) in Genf machte aus dem Wissenschaftsnetz ein Massenmedium. Zudem erfuhr die elektronische Post einen Aufschwung. Das Wachstum der Netze sprengt alle Erwartungen", resümiert Klaus Birkenbihl vom InformatikForschungszentrum GMI). Jede Web-Site, jede E-Mail-Box, jeder Computer, der per Standleitung online ist, braucht eine eindeutige Identifizierung. Die Schätzungen, wie viele IPv4-Adressen noch frei sind, schwanken zwischen 40 und zehn Prozent. Der Verbrauch jedenfalls steigt rasant: Die Anzahl der WebSites steuert derzeit auf eine Milliarde zu, weit mehr Netznummern gehen bereits für E-Mail-Anschriften drauf. Den Adressraum weiter ausschöpfen werden demnächst die intelligenten Haushaltsgeräte. Der Laden an der Ecke will wissen, welcher Kühlschrank die Milch bestellt hat, die Videozentrale braucht für das Überspielen des Films die Kennung des PC-Recorders, der Computer des Installateurs benötigt die IP-Anschrift der Heizungsanlage für die Fernwartung. Handys, die später Nachrichten übers Internet schicken, und Internet-Telefonie gehen möglicherweise leer aus. Doch bevor Internet-Adressen zur heiß begehrten Schieberware werden, soll ein neues Adresssystern mit mehr Möglichkeiten her. Schon 1990 hatte sich die Internet Engineering Task Force (IETF) Gedanken über einen neues Internet-Protokoll mit einem größeren Adressangebot gemacht. Im IETF kümmern sich Forscher, Soft- und HardwareIngenieure um die fortlaufende Verbesserung von Architektur und Arbeit des Netz werks. Eine ihrer Arbeitsgruppen prognostizierte, der IPv4-Vorrat gehe 2005 zu Ende. Fünf Jahre dauerte es, dann waren sich alle Internet-Gremien einig: Eine neue Protokollversion, IPv6, muss her. Dann passierte weiter nichts. Endlich verkündete 1999 Josh Elliot von der Icann, ab sofort würden neue Anschriften verteilt. Ein historischer Moment", freute er sich.
    Der neue 128-Bit-Header treibt die Möglichkeiten ins Astronomische: 3,4 mal zehn hoch 38 Adressen, eine 3,4 mit 38 Nullen. -Das IPv6-Forum zerhackte den Zahlentrumm in anschauliche Stücke: Pro Quadratmillimeter Erdoberfläche stehen nun zirka 667 Billiarden, pro Mensch 6,5 mal zehn hoch 28 Adressen, bereit." Eine Billiarde bringt es immerhin auf respektable 15 Nullen. Schon kurz darauf ging ein Aufschrei durch die Netzgemeinde. Das neue Protokoll schrieb die weltweit eindeutigen Seriennummern bestimmter Netzwerkkarten auf den virtuellen Adressaufkleber. Die Ethernet-Adapter bewerkstelligen den Datentransport bei Computern, die über eine Standleitung, ein Koaxialkabel, dauernd online sind. Die Spur von Ethernet-Usern wäre damit leicht zu verfolgen gewesen, ihre Nutzerprofile, ihre Surfgewohnheiten einsehbar wie offene Bücher. Das Problem, ließ Icann nun wissen, sei behoben: Es gebe keine festen Kennzahlen mehr in den Adressköpfen. Bei jedem Hochfahren eines Rechners oder sogar noch öfter werden die Nummern neu durchgemischt", erläutert Hans Petter Dittler, stellvertretender Vorsitzender der deutschen Sektion der Internet Society. Das Betriebssystem Linux kann bereits mit dem IPv6 arbeiten. Microsoft will den Standard in das nächste Windows-Betriebssystem einbauen: "Wir denken, der vorgeschlagene Standard ist wichtig zum Schutz der Privatsphäre der Internet-Nutzer", sagt Jawad Khaki, Vizepräsident für Netzwerke. Seit einigen Tagen steht auf der Microsoft-Homepage eine Vorab-Version von lPv6 für Windows 2000 zum Herunterladen bereit. Geradezu euphorisch gibt sich Protokoll-Chef Vint Cerf. Mit IPv6 haben wir die Grundlage dafür", philosophierte der Internet-Daddy auf dem ersten lPv6-Kongress 1999 in Berlin, "das Internet von unserem Planeten über den Mars und die Asteroiden bis in den Weltraum hinaus auszudehnen." Doch im Internet-Alltag wird das alte Protokoll noch lange Vorrang haben. Grund sind handfeste Programmier-Probleme. Denn Software, die sich explizit auf die vierte IP-Version bezieht, muss umgeschrieben werden - etwa um mit den längeren Adressfeldern umgehen zu können. Hubert Martens vom Münchner Multinet Services befürchtet gar einen InternetCrash: "Das Jahr-2000-Problem war harmlos gegen das, was uns mit lPv6 droht."
  9. Petry, W.; Werner, H.-J.: Anwendertraum: Kommunikations- und Retrieval-Software im Vergleich (1993) 0.00 
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    Source
    Cogito. 9(1993) H.2, S.18-22
  10. Petry, W.: Datenreisen billiger : wie man Telekommunikationskosten sparen kann (1994) 0.00 
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    Source
    Cogito. 10(1994) H.4, S.17-22
  11. Matthews, J.R.; Parker, M.R.: Local Area Networks and Wide Area Networks for libraries (1995) 0.00 
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    Date
    30.11.1995 20:53:22
  12. Scheuerer, J.: Onlinebanking (1997) 0.00 
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    Source
    Com!. 1997, H.8, S.22-24
  13. Berezak-Lazarus, N.: ADSL - Auf der Überholspur durch die Multimedia-Welt (1999) 0.00 
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    Footnote
    Rez. in: Internet Professionell 2000, H.2, S.22
  14. Buxton, A.B.: International gateways (1991) 0.00 
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    Source
    Standards for the international exchange of bibliographic information: papers presented at a course held at the School of Library, Archive and Information Studies, University College, London, 3-18 August 1990. Ed.: I.C. McIlwaine
  15. Cerf, V.G.: Netztechnik (1995) 0.00 
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    Pages
    S.22-31
  16. Duhm, U.: Ring frei zur nächsten Runde (1999) 0.00 
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    Date
    19. 2.1999 20:21:22
  17. Corey, J.F.: ¬A grant for Z39.50 (1994) 0.00 
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    Abstract
    In Sept. 1990, the US Dept. of Education's Library Technology and Cooperation Grants Program awarded a three-year grant to the Florida Center for Library Automation (FCLA), an agency of the Florida State University System, to develop software adhering to the ANSI Z39.50 Information Retrieval protocol standard. The Z39.50 software was to operate over the OSI communications protocols and be integrated with FCLA's NOTIS system, which is shared by all 9 state universities in Florida. In order to test the correctness of its Z39.50 software, FCLA sought out other library software developers who would be willing to develop Z39.50 systems of their own. As part of this process, FCLA helped to found the Z39.50 Implementor's Group (ZIG), which has since gone on to improve the standard and promote Z39.50 implementations throughout much of the North American library systems marketplace. Early on in the project, it became apparent that TCP/IP would be a more heavily used communication vehicle for Z39.50 messages than OSI. FCLA expanded its design to include TCP/IP and, by the end of the grant in Sept. 1993, will have a working Z39.50 system that can communicate over both OSI and TCP/IP networks
  18. Hinich, M.J.; Molyneux, R.E.: Predicting information flows in network traffic (2003) 0.00 
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    Abstract
    Hinich and Molyneux review the literature of internet measurement and note three results consistently to be found in network traffic studies. These are "self-similarity," "long-range dependence," by which is meant that events in one time are correlated with events in a previous time and remain so through longer time periods than expected, and "heavy tails" by which they mean many small connections with low byte counts and a few long connections with large byte counts. The literature also suggests that conventional time series analysis is not helpful for network analysis. Using a single day's traffic at the Berkeley National Labs web server, cumulated TCP flows were collected, log transforms were used with the adding of .01 to all values allowing log transforms of the zero values, and providing a distribution that overcomes the heavy tail problem. However, Hinich's bicorrelation test for nonlinearity using overlapping moving windows found strong evidence of nonlinear structures. Time series analysis assumes linear systems theory and thus additivity and scalability. Spectral analysis should provide large peaks at the lowest frequencies if long range dependence is present since the power spectrum would go to infinity if the frequency goes to zero. This does not occur and so long range dependence must be questioned, at least until it is determined what effect other OSI layers may have on the TCP data.
  19. Sloan, B.G.: Remote access : design implications for the online catalog (1991) 0.00 
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  • e 11
  • d 9

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