By T. Miki (auth.), W. K. Ritchie, J. R. Stern (eds.)
ISBN-10: 9401046700
ISBN-13: 9789401046701
ISBN-10: 9401115346
ISBN-13: 9789401115346
Customer call for for an ever-wider diversity of communciations prone and interesting new technological innovations are forcing advancements in either the overseas and strategic making plans contexts. This quantity surveys these advancements in either the overseas and strategic making plans contexts.
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Extra resources for Telecommunications Local Networks
Example text
From the very beginning the testing projects were based on two developments resulting in: • the fast provision of multichannel and digital optical fibre transmission systems to be used in the long-distance network and the junction line network of the local networks; • the early use of optical fibre technology at the subscriber line level for providing narrowband services and new broadband communications modes. e. its behaviour under operational conditions. These projects mark phase one of the optical fibre subscriber line tests.
However, Telekom and industry gained important knowledge about the problems still to be solved before FITL systems can be introduced on a large scale. g. several TV programmes) to the subscriber's home was limited for technical reasons. Therefore, alternative techniques to provide the subscriber with a wide range of programmes had to be tested, such as the selection of the TV programmes by the subscriber (video on demand) in the exchange. Despite the great progress made with fibre and components, similar considerations have to be made even today, particularly in view of the introduction of HDTV.
Each of these two assumptions can be addressed more fully. 2 COST TODAY AND FLEXIBILITY TOMORROW To understand the issue of cost parity with copper, one must first examine the complexion of the local loop. Rather than a single fixed cost target, the new fibre-based loop systems will need to meet a range of applications and approaches. In a loop survey compiled by Bellcore in 1983, the loop length varied from a minimum of 56 m to a maximum of 38 km (see Fig. 1). 6 km or shorter. Over the last two decades, central office consolidation extended the typical COST TODAY AND FLEXIBILITY TOMORROW 45 radius of a serving central office to 13 km.
Telecommunications Local Networks by T. Miki (auth.), W. K. Ritchie, J. R. Stern (eds.)
by Daniel
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