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Chapter 16: Telephone Instruments and Signals – Tomasi Review

Chapter 16: Telephone Instruments and Signals

This is the summary notes of the important terms and concepts in Chapter 16 of the book "Electronic Communications System" by Wayne Tomasi. The notes are properly synchronized and concise for much better understanding of the book. Make sure to familiarize this review notes to increase the chance of passing the ECE Board Exam.


CHAPTER 16

TELEPHONE INSTRUMENTS
AND SIGNALS


Items

Definitions

Terms

1

Process of conveying information from one place to another.

Communications

2

Is a long-distance communications

Telecommunications

3

One of the most remarkable devices ever invented.

Telephone

4

Anyone who uses a telephone or a data modem on a telephone
circuit is part of a global communications network.

Public Telephone Network

5

The PTN is comprised of several very large corporations and
hundreds of smaller independent companies jointly.

Telco

6

The telephone system as we know it today began as an unlikely
collaboration of two men with widely disparate personalities:

Alexander Graham Bell and Thomas A. Watson

7

The simplest and most straightforward form of telephone
service.

Plain Old Telephone Service

8

Most fundamental component of a telephone circuit.

Subscriber Loop or Local Loop

9

An unshielded twisted-pair transmission line consisting of two
insulated conductors twisted together

Local Loop

10

Comes from the Greek word "tele" meaning from afar
and phone, meaning sound, voice, or voiced sound.

Telephone

11

The first telephone set that combined a transmitter and
receiver into a single handheld unit was introduced in 1878

Butterstamp Telephone

12

Helps prevent the speaker from talking too loudly

Sidetone or Talkback

13

The pair of wores connecting.

Local Loop

14

A series of telephone connection interfaces that are
registered with the U.S. Federal Communications Commission.

RJ or Registered Jacks

15

The most common telephone jack in use today and can have up to
six conductors.

RJ-11

16

An apparatus that creates an exact likeness of sound waves
with an electric current.

Telephone Set

17

Is originally an electromagnetic bell, placed directly across
the tip of the ring of the local loop.

Ringer Circuit

18

Purpose of a Ringer.

Alert the destination party of incoming
calls

19

Sometimes called a Switch Hook.

On/Off Hook Circuit

20

Helps solve an important transmission problem in telephone set
design.

Equalizers

21

It is the transmitter of the telephone.

Microphone

22

Converts acoustical signals in the form of sound pressure
waves from the caller to electrical signals that are transmitted into the
telephone network.

Microphone

23

Enables the subscriber to output signals representing digits.

Dialing Circuit

24

Signaling messages can be subdivided further into one or four
categories:

Alerting, Supervising,
Controlling, and
Addressing

25

Indicate a request for service.

Alerting Signals

26

Provide call status information.

Supervising Signals

27

Provide information in the form of announcements.

Controlling Signals

28

Provide the routing information.

Addressing Signals

29

Is strictly for signaling between a subscriber’s location and
the nearest telephone office or message switching center.

DTMF

30

Are used to transfer digits and control signals between
switching machines.

Multifrequency Tones

31

Are combinations of two frequencies that fall within the
normal speech bandwidth so they can be propagated over the same circuits as
voice.

MF Tones

32

Equipment Busy Signal is sometimes.

Congestion Tone or No-Circuit-Available

33

Occurs whenever the system is overloaded and more calls are
being placed than can be completed.

Blocking

34

Is sent from a central office to a subscriber whenever there
is an incoming call.

Ringing signal

35

Telephones that operate without the cords attached to the
handset.

Cordless Telephones

36

Relay radio signals and messages from wire line and cellular
telephones to subscribers carrying portable receivers.

Paging Transmitters

Complete List of Reviewers in Electronic Communications System per Chapter

Important List of Communications Engineering Materials

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