By David R. Smith
Digital Transmission structures, 3rd Edition, is a complete assessment of the speculation and practices of electronic transmission structures utilized in electronic verbal exchange. This new version has been thoroughly up-to-date to incorporate the most recent applied sciences and latest options within the transmission of digitized info in addition to assurance of electronic transmission layout, implementation and trying out.
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Additional info for Digital Transmission Systems
Digital As analog transmission networks incorporate and evolve toward digital facilities, the reference circuit must show a representative mix of analog and digital transmission facilities. Interfaces of digital and analog equipment also must be reflected in the choice of reference circuit. An example of such a hybrid system is the use of digital multiplexing for telephony but with circuit switching done on an analog basis, requiring that AID conversion equipment (such as peM) appear at each switching center.
Ine vitably, discussion of certain digital communication topics had to be curtailed or omitted to keep the book to a manageable size. A separate, thorough treatment of error correction codes has not been attempted, although their use with transmission systems is described in Chapter 5. Switching systems have been discussed only to the extent that they influence transmission system design and performance. The growth in data communications has led to the development of many technologies, such as packet switching, which are not given thorough treatment here.
A long-haul circuit , for example, may require a mix of satellite, radio, and cable media. Transmission systems may be devised for single circuits or for multiple circuits through the use of multiplexing techniques. Transmission systems may also interconnect many users to provide a network for communication. As the size of a network grows, it becomes impractical to provide dedicated transmission channels for each circuit. Hence, most networks employ switches that provide a temporary circuit at the request of one of the connected users.