By Brebner G.
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Das Buch gibt einen fundierten Überblick über aktuelle und zukünftige Satellitensysteme für Mobilkommunikation (personal verbal exchange) und Breitbandkommunikation. In Teil I werden die Grundlagen von geostationären und nichtgeostationären Satellitenkonstellationen sowie die damit verbundenen nachrichtentechnischen Fragen behandelt.
This e-book constitutes the refereed court cases of the thirteenth IFIP TC 6/TC eleven foreign convention on Communications and Multimedia safety, CMS 2012, held in Canterbury, united kingdom, in September 2012. The 6 revised complete papers awarded including eight brief papers, eight prolonged abstracts describing the posters that have been mentioned on the convention, and a pair of keynote talks have been rigorously reviewed and chosen from forty three submissions.
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A main difference from radio is that infra- INTRODUCTION 17 red waves do not pass through solid objects, and so its use is confined to within rooms. Infra-red is not normally usable outdoors, since the sun’s rays interfere. One advantage of the in-room use is that infra-red transmissions are not regulated, unlike radio, which involves the central assignment of radio frequencies to users. Infra-red is an unguided medium that is naturally unicast, but can be used in either unicast or broadcast modes.
The N-ISDN basic service, designed to replace a normal telephone link, offers two 64 Kbit per second digital channels for voice or data transmission, together with a 16 Kbit per second control channel. Each 64 Kbit per second channel is suitable for transmitting speech in digital form, so essentially N-ISDN offers the equivalent of two telephone lines instead of one. N-ISDN services are now offered in many countries. To allow use of N-ISDN when a remote computer supports it, and the normal telephone service otherwise, devices called hybrid modems are available.
If a user requires faster transmission rates at present, then the norm is to make use of a leased line provided by a public carrier. This gives a direct link between two fixed points, with transmission rates of up to 45 Mbits per second being available in North America and Japan, and up to 34 Mbits per second being available elsewhere in the world. The difference in rates is due to the slightly different digital transmission mechanisms used in the two different parts of the world. These will be described in outline here.