By James Gleick

Blut, Treibstoff, Lebensprinzip - in seinem furiosen Buch erzählt Bestsellerautor James Gleick, wie die info zum Kernstück unserer heutigen Zivilisation wurde. Beginnend bei den Wörtern, den "sprechenden" Trommeln in Afrika, über das Morsealphabet und bis hin zur Internetrevolution beleuchtet er, wie die Übermittlung von Informationen die Gesellschaften prägten und veränderten. Gleick erläutert die Theorien, die sich mit dem Codieren und Decodieren, der Übermittlung von Inhalten und dem Verbreiten der Myriaden von Botschaften beschäftigen. Er stellt die bekannten und unbekannten Pioniere der Informationsgesellschaft vor: Claude Shannon, Norbert Wiener, Ada Byron, Alan Turing und andere. Er bietet dem Leser neue Einblicke in die Mechanismen des Informationsaustausches. So lernt dieser etwa die sich selbst replizierende Meme kennen, die "DNA" der Informationen. Sein Buch ermöglicht ein neues Verständnis von Musik, Quantenmechanik - und eine gänzlich neue Sicht auf die faszinierende Welt der Informationen.

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I l , .. ~" ' INTERFACE +EJ+B' : , I DCE DCE COMMUNICATION \ : I 8: SUBNETWORK + 8 + I I ,~ DeE , DCE I I INTERFACE Fig. 4. 21 standard. The data transmission shown in Fig. 4 is in a telephone net. The basic units of data transmission are - the Data-Circuit Terminating Equipment (DCE) , - the Data-Terminal Equipment (DTE). The DCE is at the end of the circuit; the equipment is owned by the postal authorities and is connected to the DTE with a standard interface by the subscriber. 24 interface.

13. Identifiers The name is a linguistic object identifying an entity. The name can be global (it is valid in the whole network in other words universal). or local (it is valid only in a small region). The names have three types: - the primitive name allocated to the entity by the denominator (it is forbidden to give the same primitive name inside a network). - the descriptive name is a statement. which is valid only for one entity in the system. - the general name is the common name of the entity set.

In Fig. 23 the upper layer is characterized by an active model while the lower one is built into the transmission path. It is trivial that the error characteristics of the transmission path determine the number of acknowledgements of successful transmissions. Therefore, reasonably selected acknowledgement mechanisms are different in cases of different error percentages. 28 2. 1 ABOUT THE SEVEN LAYERS The Seven Layers In the standard recommendation of the Reference Model. ISO suggests the separation of the seven layers.

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