Modern Cable Television Technology: Video, Voice, and Data Communications
A technical reference and handbook for electronics and telecommunications engineers working with cable television transmission systems.
TABLE OF CONTENTS Modern Cable Television Technology: Video, Voice, and Data Communications
Part V: System Architecture
Chapter List
- Chapter 15: Service-Related Architecture Requirements
- Chapter 16: Architectural Elements and Examples
- Chapter 17: Network Reliability and Availability
15.1 Introduction
The architecture of a cable system is a description of how the major elements signal acquisition, signal processing, signal transport, and subscriber terminal equipment are interconnected. The first step to selecting or analyzing a specific network architecture is to analyze the services to be delivered and their requirements. It is that analysis that will be covered by this chapter.
First, we discuss the categories of service-related parameters that are affected by architecture, then the requirements of various specific service types. The emphasis will be on the process to setting standards and on alternative means of meeting those standards rather than on suggesting specific values.
Chapter 16 will deal with specific architectures and how they differ relative to the parameters discussed here, and Chapter 17 will cover the calculation of network reliability and availability, given a specific equipment configuration.
15.2 Performance Parameters
Network performance can be measured by many yardsticks. Signal quality in the broadband distribution system, including noise, distortion, levels, frequency response, and other related parameters, is extensively discussed in Chapters 9 14. Other architecture-affected topics are discussed in this chapter.
15.2.1 Information Capacity
The information capacity of a network is a composite of many factors, including the RF bandwidth, the efficiencies of the processes by which raw information is encoded for modulation onto RF carriers, spatial reuse of the network, and efficient sharing among users with varying needs for information transmittal rate.
Downstream RF Bandwidth
One of the fundamental measures of the broadband, linear distribution network is the range of frequencies used to transport signals toward customers. In cable television systems, the lower limit of downstream frequency range in coaxial distribution networks is constrained by the fact that upstream signals are almost always carried ...
Copyright Morgan Kauffmann 1999 under license agreement with Books24x7
