EDITION 8
8 CREDIT HOURS
SIGNAL SUBCOURSE 333
TELEPHONE SYSTEM CHARACTERISTICS
INTRODUCTION
The quality of a communication system depends on many things.
Can we recognize the voice of the speaker?
How far apart are the telephones?
What quality of reproduction is needed to enable us to communicate by
voice?
What is the frequency response of the telephone receiver?
Why do we sometimes select a four-wire circuit instead of a two-wire
circuit?
How does echo interfere with our conversation?
How much noise can we tolerate and still hear the message?
These technical implications refer to telephone system characteristics.
Overall system characteristics are determined by the total effect of all
components that make up the system.
Circuit conditioners must be aware of
telephone system characteristics and their effects, because many times these
technicians are called upon to modify the characteristics to accommodate other
types of signals such as data.
This subcourse will provide you with an introduction to telephone systems,
and will present them in terms of signal levels.
This subcourse consists of four lessons and an examination, as follows:
CREDIT
LESSONS
HOURS
PAGE
1.
Introduction to Telephone Systems
2
1
2.
Network Losses and Gains
2
11
3.
Echo Suppressors and Compandors
2
32
4.
1
43
Examination
1
66
You are urged to finish this subcourse without delay; however, there is no
specific limitation on the time you may spend on any lesson.
Materials furnished:
Subcourse Booklet
i
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