9
CONCEPTS IN TRANSMISSION
TRANSPORT
9.1
OBJECTIVE
A telecommunication network consists of customer premise equipment (CPE), switch-
ing nodes, and transmission links as illustrated in Figure 9.1. Chapter 5 dealt with one
important type of CPE, namely the telephone subset. The chapter also covered wire-
pair connectivity from the telephone subset to the local serving switch over a subscriber
loop. Basic concepts of switching were reviewed in Chapter 4, and Chapter 6 covered
digital switching. In this chapter we introduce the essential aspects for the design of
long-distance links.
There are four different ways by which we can convey signals from one switching
node to another:
1. Radio
2. Fiber optics
3. Coaxial cable
4. Wire pair
Emphasis will be on radio and fiber optics. The use of coaxial cable for this application is
deprecated. However, it was widely employed from about 1960 to 1985 including some
very-high-capacity systems. One such system (L5) crossed the United States from coast
to coast with a capacity in excess of 100,000 simultaneous full-duplex voice channels
Node
CPE
CPE
Node
Node
Link
Link
Figure 9.1
A telecommunication network consists of customer premise equipment (CPE), switching
nodes, and interconnecting transmission links.
Fundamentals of Telecommunications, Second Edition, by Roger L. Freeman
ISBN 0-471-71045-8
Copyright
2005 by Roger L. Freeman
195
Summary :
One such system (L5) crossed the United States from coast to coast with a capacity in excess of 100,000 simultaneous full-duplex voice channels Node CPE CPE Node Node Link Link Figure 9.1 A telecommunication network consists of customer premise equipment (CPE), switching nodes, and interconnecting transmission links.
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