Chapter 18: The Public Telephone Network - Review Notes

Reviewer and summary notes of the important concepts and formulas in Chapter 18 of the book "Introduction to Electronics Communications" by Wayne Tomasi.

Chapter 18: The Public Telephone Network

This is the summary notes of the important terms and concepts in Chapter 18 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 18

THE PUBLIC TELEPHONE NETWORK

Items

Definitions

Terms

1

It uses the largest computer network in the world to interconnect millions of subscribers in such a way that the myriad of companies function as a single entity.

Public Telephone Network (PTN)

2

Identifies and connects the subscribers to a suitable transmission path.

Switching

3

Supply and interpret control and supervisory signals needed to perform the operation.

Signaling

4

The public telephone companies.

Service Providers

5

Equipment and facilities that are available to all public subscribers to the network.

Common Usage Equipment

6

Another name for Public Switched Telephone Network (PSTN).

Dial-Up Network

7

The transmittal of digital information between two pieces of digital equipment.

Data Transmission

8

Any device used to originate and terminate calls and to transmit and receive signals into and out of the telephone network.

Instrument

9

The instrument is often referred.

Station Equipment

10

The location of the equipment.

Station

11

The operator or user of the instrument.

Subscriber

12

The dedicated cable facility used to connect an instrument at a subscriber's station to the closest telephone office.

Local Loop

13

Similar to local loop except trunk circuits are used to interconnect two telephone offices.

Trunk Circuits

14

The dedicated cable facility used to connect an instrument at a subscriber's station to the closest telephone office.

Local Loop

15

Similar to local loop except trunk circuits are used to interconnect two telephone offices.

Trunk Circuits

16

A central location where subscribers are interconnected, either temporarily or on permanent basis.

Exchange

17

Programmable matrices that provide temporary signal paths between two subscribers.

Switching Machines

18

Exchanges connected directly to local loops.

Local Exchanges

19

The first commercial telephone switchboard began operation New Haven, Connecticut.

January 28, 1878

20

The first local telephone exchanges.

Switchboards

21

A system of sensors, switches, and other electrical and electronic devices that allows subscribers to give instructions directly to the switch without having to go through an operator.

Automated Switching

System

22

Allowed subscribers to manually dial the telephone number of the party they wished to call.

Mechanical Dialer

23

Commonly called for stepper or step-by-step (SXS).

Strowger Switch

24

Simply the path over which voice, data, or video signals propagate.

Circuit

25

A programmable matrix that allows circuits to be connected tom one another.

Circuit Switch

26

Telephone call completed within a single local exchange.

Intraoffice Call

27

Telephone calls placed between two stations that are connected to different local exchanges.

Interoffice calls

28

Another name for interoffice calls.

Interswitch Calls

29

Telephone switching machines in local exchanges are connected to other local exchange office.

Trunks or Interoffice Trunk

30

It is used to interconnect local offices that do not have interoffice trunks directly between them. An exchange without any local loops connected to it.

Tandem Office

31

Switches that interconnect local offices only.

Tandem

32

Trunk circuits that terminates in tandem switches.

Tandem Trunk or

Intermediate Trunk

33

Interstate long distance telephone calls require a special telephone office.

Toll Office

34

Provides telephone numbering system for the United States, Mexico and Canada.

North American

Telephone

Numbering Plan (NANP)

35

It allows many subscriber to share a limited number of lines to a central office switch.

Concentrator

36

A path between two subscribers and is comprised of one or more switches, two local loops; and possibly one or more trunk circuits.

Route

37

A call that call cannot be completed because the necessary trunk circuits or switching paths are not available, the calling party receives an equipment busy signal.

Blocking

38

A local exchange where subscriber loops terminated and received dial tone.

Class 5 End Switching Office

39

Class 4 office having only outward and inward calling service.

Class 4P Switching Office

40

Class 4 office provided human operators for both outward and inward calling service.

Class 4C

41

Switching office that provide service to small groups of class 4 offices within a small area of a state.

Class 3 Primary Center

42

Sectional centers that could provide service to geographical regions varying in size from part of a state to all of several states.

Class 2 Sectional

43

Regional centers were the highest ranking office in the DDD network in terms of the size of the geographical are served and the trunking options available.

Class 1 Regional Center

44

Toll trunks in tandem, excluding the two terminating links at the ends of the connection.

Intermediate Links

45

A global standard for telecommunications defined by the ITU.

Common Channel

Signaling System No. 7

(SS7 or C7)

46

Refers to the exchange of information between call components required to provide and maintain service.

Signaling

47

An architecture for performing out of band signaling in support of common telephone system functions.

SS7

48

Long distance access is now accomplished through an access point.

Point of Presence

(POP)

49

A telecommunications term that describes the legal boundaries for the responsibility of maintaining equipment and transmission lines.

POP

50

Provide access to the SS7 network, access to databases used by switches inside and outside the network.

Signaling Points

51

Codes that are carried in signaling messages exchanged between signaling points to identify the source and destination of each messages.

Point Codes

52

Local telephone switches equipped with SS7 compatible software and terminating signal links

Service Switching Points

53

The packet switches of the SS7 network.

Signal Transfer Points

54

It serves as an interface to telephone company databases.

Service Control Points

55

Another name for service control points.

Signal Control Points

56

Provides access from one level of the protocol to another.

Primitive

Complete List of Reviewers in Electronic Communications System per Chapter

Important List of Communications Engineering Materials


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