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A transmission medium (plural transmission media) is a material substance (solid, liquid, gas, or plasma) that can propagate energy waves. For example, the transmission medium for sound received by the ears is usually air, but solids and liquids may also act as transmission media for sound.

The absence of a material medium in vacuum may also constitute a transmission medium for electromagnetic waves such as light and radio waves. While material substance is not required for electromagnetic waves to propagate, such waves are usually affected by the transmission media they pass through, for instance by absorption or by reflection or refraction at the interfaces between media.

The term transmission medium also refers to a technical device that employs the material substance to transmit or guide waves. Thus, an optical fiber or a copper cable is a transmission medium. Not only this but also is able to guide the transmission of networks.

A transmission medium can be classified as a:

• Linear medium, if different waves at any particular point in the medium can be superposed;
• Bounded medium, if it is finite in extent, otherwise unbounded medium;
• Uniform medium or homogeneous medium, if its physical properties are unchanged at different points;
• Isotropic medium, if its physical properties are the same in different directions.

Coaxial cable, one example of a transmission medium

Electromagnetic radiation can be transmitted through an optical media, such as optical fiber, or through twisted pair wires, coaxial cable, or dielectric-slab waveguides. It may also pass through any physical material that is transparent to the specific wavelength, such as water, air, glass, or concrete. Sound is, by definition, the vibration of matter, so it requires a physical medium for transmission, as does other kinds of mechanical waves and heat energy. Historically, science incorporated various aether theories to explain the transmission medium. However, it is now known that electromagnetic waves do not require a physical transmission medium, and so can travel through the "vacuum" of free space. Regions of the insulative vacuum can become conductive for electrical conduction through the presence of free electrons, holes, or ions.

Telecommunications[link]

Many transmission media are used as communications channels.

For telecommunications purposes in the United States, Federal Standard 1037C, transmission media are classified as one of the following:

• Guided (or bounded)—waves are guided along a solid medium such as a transmission line.
• Wireless (or unguided)—transmission and reception are achieved by means of an antenna.

Wireless media may carry surface waves or skywaves, either longitudinally or transversely, and are so classified.

In both cases, communication is in the form of electromagnetic waves. With guided transmission media, the waves are guided along a physical path; examples of guided media include phone lines, twisted pair cables, coaxial cables, and optical fibers. Unguided transmission media are methods that allow the transmission of data without the use of physical means to define the path it takes. Examples of this include microwave, radio or infrared. Unguided media provide a means for transmitting electromagnetic waves but do not guide them; examples are propagation through air, vacuum and seawater.

The term direct link is used to refer to the transmission path between two devices in which signals propagate directly from transmitters to receivers with no intermediate devices, other than amplifiers or repeaters used to increase signal strength. This term can apply to both guided and unguided media.

A transmission may be simplex, half-duplex, or full-duplex.

In simplex transmission, signals are transmitted in only one direction; one station is a transmitter and the other is the receiver. In the half-duplex operation, both stations may transmit, but only one at a time. In full duplex operation, both stations may transmit simultaneously. In the latter case, the medium is carrying signals in both directions at same time.

See also[link]

• Vacuum permittivity
• Transmission (telecommunications)
• Excitable medium
• Duplex (telecommunications)

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Friedrich A. Kittler (June 12, 1943 – October 18, 2011) was a literary scholar and a media theorist. His works relate to media, technology, and the military.

Biography[link]

Friedrich Adolf Kittler was born in 1943 in Rochlitz in Saxony. His family fled with him to West Germany in 1958, where from 1958 to 1963 he went to a natural sciences and modern languages Gymnasium in Lahr in the Black Forest, and thereafter, until 1972, he studied German studies, Romance philology and philosophy at the Albert Ludwigs University of Freiburg in Freiburg im Breisgau. During his studies, he was influenced by Jacques Lacan's and Michel Foucault's writings.

In 1976, Kittler received his doctorate in philosophy after a thesis on the poet Conrad Ferdinand Meyer. Between 1976 and 1986 he worked as academic assistant at the university's Deutsches Seminar. In 1984, he earned his Habilitation in the field of Modern German Literary History.

He had several stints as a Visiting Assistant Professor or Visiting Professor at universities in the United States, such as the University of California, Berkeley, the University of California, Santa Barbara and Stanford University.

From 1986 to 1990, he headed the DFG's Literature and Media Analysis project in Kassel and in 1987 he was appointed Professor of Modern German Studies at the Ruhr University. In 1993 he was appointed to the chair for Media Aesthetics and History at the Humboldt University of Berlin. Between 2005 and 2011 he was a professor at the European Graduate School in Saas-Fee, Switzerland.^[1]

In 1993, Kittler was awarded the "Siemens Media Arts Prize" (Siemens-Medienkunstpreis) by ZKM Karlsruhe (Zentrum für Kunst und Medientechnologie, or "Centre for Art and Media Technology") for his research in the field of media theory.^[2]

He was recognized in 1996 as a Distinguished Scholar at Yale University and in 1997 as a Distinguished Visiting Professor at Columbia University in New York. Kittler was a member of the Hermann von Helmholtz Centre for Culture and the research group Bild Schrift Zahl ("Picture Writing Number") (DFG). He died in Berlin. His last words were reportedly "Alle Apparate auschalten", which translates, referring to the machines which were keeping him alive, as "switch off all apparatuses".^[3]

Work and its importance[link]

Friedrich Kittler is seminal in the new approach to media theory that grew popular starting in the 1980s, new media (German: Technische Medien, which translates roughly to "technical media"). Kittler's central project is to "prove to the human sciences [...] their technological-media a priori" (Hartmut Winkler), or in his own words: "Driving the spirit out of the humanities",^[4] a title that he gave a work that he published in 1980.

Kittler sees an autonomy in technology and therefore disagrees with Marshall McLuhan's reading of the media as "extensions of man": "Media are not pseudopods for extending the human body. They follow the logic of escalation that leaves a written history behind it. (Kittler in Geschichte der Kommunikationsmedien. In: Jörg Huber, Alois Martin Müller (publishers): Raum und Verfahren).

Consequently, he sees in writing literature, in writing programmes and in burning structures into silicon chips a complete continuum: "As we know and simply do not say, no human being writes anymore. [...] Today, human writing runs through inscriptions burnt into silicon by electronic lithography [...]. The last historic act of writing may thus have been in the late seventies when a team of Intel engineers [plotted] the hardware architecture of their first integrated microprocessor." (Kittler, Es gibt keine Software. In: ders.: Draculas Vermächtnis. Technische Schriften).

See also[link]

• Media influence
• Paul Virilio

Notes[link]

Publications[link]

• 2009: Musik und Mathematik. Band 1: Hellas, Teil 2: Eros. Wilhelm Fink Verlag, Paderborn.
• 2006: Musik und Mathematik. Band 1: Hellas, Teil 1: Aphrodite. Wilhelm Fink Verlag, Paderborn.
• 2004: Unsterbliche. Nachrufe, Erinnerungen, Geistergespräche. Wilhelm Fink Verlag, Paderborn.
• 2002: Zwischen Rauschen und Offenbarung. Zur Kultur- und Mediengeschichte der Stimme (as publisher). Akademie Verlag, Berlin
• 2002: Optische Medien. Merve: Berlin. ISBN 3-88396-183-3 (English edition: Optical Media, with an introduction by John Durham Peters. Polity Press 2010)
• 2001: Vom Griechenland (with Cornelia Vismann; Internationaler Merve Diskurs Bd.240). Merve: Berlin. ISBN 3-88396-173-6
• 2000: Nietzsche – Politik des Eigennamens: wie man abschafft, wovon man spricht (with Jacques Derrida). Berlin.
• 2000: Eine Kulturgeschichte der Kulturwissenschaft. München
• 1999: Hebbels Einbildungskraft – die dunkle Natur. Frankfurt, New York, Vienna
• 1998: Zur Theoriegeschichte von Information Warfare
• 1998: Hardware das unbekannte Wesen
• 1997: Literature, Media, Information Systems: Essays (published by John Johnston). Amsterdam
• 1993: Draculas Vermächtnis: Technische Schriften. Leipzig: Reclam. ISBN 3-379-01476-1 Essays zu den "Effekten der Sprengung des Schriftmonopols", zu den Analogmedien Schallplatte, Film und Radio sowie "technische Schriften, die numerisch oder algebraisch verfasst sind".
• 1991: Dichter – Mutter – Kind. Munich
• 1990: Die Nacht der Substanz. Bern
• 1986: Grammophon Film Typewriter. Berlin: Brinkmann & Bose. ISBN 3-922660-17-7 (English edition: Gramophone, Film, Typewriter, Stanford 1999)
• 1985: Aufschreibesysteme 1800/1900. Fink: Munich. ISBN 3-7705-2881-6 (English edition: Discourse Networks 1800 / 1900, with a foreword by David E. Wellbery. Stanford 1990)
• 1979: Dichtung als Sozialisationsspiel. Studien zu Goethe und Gottfried Keller (with Gerhard Kaiser). Göttingen
• 1977: Der Traum und die Rede. Eine Analyse der Kommunikationssituation Conrad Ferdinand Meyers. Bern-Munich

Literature[link]

Secondary literature on Friedrich Kittler:

• Frank Hartmann: Friedrich Kittler. In: Information Philosophie 25 (1997) 4, S. 40-44.
• Josef Wallmannsverger: Friedrich Kittler. In: Helmut Schanze (publisher): Metzler Lexikon Medientheorie/ Medienwissenschaft, S. 162 f. Stuttgart 2002.
• Geoffrey Winthrop-Young: Friedrich Kittler zur Einführung, Hamburg: Junius Verlag 2005.

Lectures[link]

• The Relation of Art and Techne, European Graduate School
• Friedrich Kittler. Ein Medienphilosoph, European Graduate School
• Die Endlichkeit der Algorithmen
• Aphrodite mit Stefan Münker
• Farben und/oder Maschinen denken
• Vom Gott der Diebe zum gerechneten Raum
• Kittler liest Gedichte von Sappho und spricht über die Liebe
• Blitz und Serie, Ereignis und Donner
• Ontologie der Medien

External links[link]

• Friedrich Kittler Faculty page at European Graduate School. Biography, bibliography, articles and video lectures
• Friedrich Kittler in the German National Library catalogue (German)
• Auf dem Weg in den Maschinenpark - Rezension Friedrich Kittler: Eine Kulturgeschichte der Kulturwissenschaft - von Frank Hartmann, 28 November 2000
• Telepolis: Friedrich Kittler meets Stephan Schambach von Stefan Krempl, 26. Mai 2000
• Telepolis: Vom Sündenfall der Software - Medientheorie mit Entlarvungsgestus: Friedrich Kittler - von Frank Hartmann, 22 December 1998
• Telepolis: Nicht Cyborg, sondern Affe 17 April 2005
• "Rock me, Aphrodite!" - Interview mit Kittler auf Telepolis, 24 May 2006.
• "Hegel is dead. Miscellanea on Friedrich A. Kittler (1943-2011)" - Obituary on Kittler, Telepolis, 17 November 2011.
• The Sigmund H. Danziger, Jr. Memorial Lecture in the Humanities (Sigmund H. Danziger, Jr Lecture 1993-1994
• "We only have ourselves to draw upon"" - An interview by Andreas Rosenfelder

Notes[link]