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Abstract

This article will examine the Z39.50 Information Retrieval protocol. It will look at some of the history of the protocol, its operation, and some of the major projects that have made use of it. There has been enough written (perhaps too much) about Z39.50 in the last several years so it is not intended to be a tutorial or detailed description of the protocol. The material that will be presented will try and put some context around the discussion. For those readers who are interested in delving into Z39.50 in a more technical manner, references to much of the material that has been written about it over the years will be provided at the end. Finally, the article will conclude with some thoughts on how technology and technological infrastructure have changed in the years since Z39.50 was initially developed and deployed, and where the protocol has so far lived up to its goals, and where it has perhaps failed to meet some of the high expectations that at least some people involved in the Z39.50 community held for it. The article will conclude with some of the author's speculations (and they are really no more than that) of what the future role of Z39.50 is likely to be.

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Content

Enthält die Beiträge: RÖTGER, A.: Die Schritt-Macher; STERBAK, R.: Die Mega-Handys; LANG, M.: Neue Hardware braucht das UMTS-Land; ZÖBELEIN, K.: Dringend gesucht: die Killer-Applikation; OTTEN, D.: Peilstation in der Westentasche; EBERL, U.: UMTS++

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Content

Weniger begeistert sind die Rivalen der Telekom beim Kampf um den Telefon- und Internetmarkt. Sie werden von der TarifOffensive kalt erwischt. Arcor-Mannesmann etwa dürfte mit dem gerade eingeführten Angebot von 79 Mark für einen 768-Kilobit-Zugang in Zwangs-Kombination mit einem Hochpreis-ISDN-Anschluss beim Kunden wenig Punkte sammeln. Online-Hauptkonkurrent AOL hat das Produkt DSL-Flatrate bislang überhaupt noch nicht auf dem Plan. Dabei könnte das hauseigene Intemet-TV-Angebot AOLlive durch den DSL-Turbo profitieren. Auch bei der Bertelsmann Broadband Group (BBG) ist man mit den DSL-Offerten der Telekom nicht zufrieden. Allerdings aus anderen Gründen. Das Hamburger Unternehmen möchte über Telefonund Kabelnetze interaktives Fernsehen in die Haushalte schicken. "Die Bandbreite ist das entscheidende Handicap", sagt Michael Schacht, Leiter Produktmanagement der BBG. Um unsere Angebote über DSL-Leitungen in guter Qualität auf einen Fernseher zu schicken, reichen 768 Kilobit nicht aus. Wir brauchen mindestens zwei Megabit." Helle Aufregung herrscht bei Deutschlands Kabelnetzbetreibern. Für eine "Kriegserklärung" an die Branche hält Dietmar Schickel, Geschäftsführer des Netzbetreibers Telecolumbus, das Vorgehen der Telekom. Telecolumbus bietet M Berlin einen Highspeed-Zugang zum Web über das TV-Netz an. 49 Mark sind ein quer subventionierter Dumpingpreis. Der Monopolist zeigt seine Krallen", schimpft Schickel. Hintergrund der Empörung: In den Businessplänen der KabelnetzUnternehmen steht die Vermarktung von Highspeed-Internet-Zugängen ganz oben. Sollte die Telekom mit ihrer DSL-Großoffensive in den nächsten zwei Jahren den Markt der Highspeed-Kunden abschöpfen, könnten sich die Milliardeninvestionen, die jetzt in die Modernisierung der Kabelnetze gesteckt werden, nicht mehr rechnen. "Das Tarifdumping" mahnt Schickel, "ist ein Fall für den Regulierer"."