Chapter 16: Telephone Instruments and Signals - Review Notes

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

Reviewer in Electronic Communications System by Wayne Tomasi

Important List of Communications Engineering Materials

Communications Engineering Coaching Materials

Series of Communications Engineering Exams: ECE Pre-Board

Series of Questions and Answers in Communications Engineering

Multiple Choice Questions in Data Communications and Networking

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