Chapter 18: The Public Telephone Network - Review Notes

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

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

---