Information Theory

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By James Gleick

ISBN-10: 3868813128

ISBN-13: 9783868813128

Blut, Treibstoff, Lebensprinzip - in seinem furiosen Buch erzählt Bestsellerautor James Gleick, wie die details 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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Three twisted pairs carry signals from its hub to a PC. Each of the three twisted pairs uses ternary (not binary) signaling using three logic levels. Thus, one of 3 × 3 × 3 = 27 symbols can be sent at once. Only 16 symbols are used, though, which is equivalent to sending 4 bits at once. With 25 MHz clocking, 25 MHz×4 bits yields a data rate of 100 Mbps. The channel from the PC to hub operates at 33 MHz. For most PC applications, an asymmetrical connection with more capacity from hub to PC for downloads is acceptable.

Uncompressed digital voice consists of 8000 samples/second of 8 bits each (or 64 Kbps). Thus, the SONET STS-1/OC-1 frames are generated at a rate of 8000 frames/second. 19 where ATM is being carried over SONET). The functions of the layers are (Onvural 95): • Path = End-to-end transport as well as functions including multiplexing and scrambling. • Line = Functions include framing, multiplexing, and synchronization. 38 1 Networking and Grids Fig. 18. An STS-1/OC-1 SONET frame ATM Path Line Section Photonic Fig.

Each piconet that is part of a scatternet uses a separate pseudo-random frequency hopping sequence. The scatternet approach results in a very small decrease in throughput. Note that a node can be on several piconets in a scatternet. Moreover, it may be a master node on some piconets and a slave node on other piconets. 4 Zigbee In actuality, the original Bluetooth has faced some problems in gaining acceptance. 11 technology and its pricing has not given Bluetooth a price advantage on certain applications (Zheng 04).

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Die Information by James Gleick


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