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.
2)
Identifies and connects the subscribers to a suitable transmission path.
3)
Supply and interpret control and supervisory signals needed to perform the operation.
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. Any device used to originate and terminate calls and to transmit and receive signals into and out of the telephone network.
8)
9)
The instrument is often referred.
10) 11)
12)
11)
The location of the equipment. The operator or user of the instrument. The dedicated cable facility used to connect an instrument at a subscriber's station to the closest telephone office. Similar to local loop except trunk circuits are used u sed to interconnect two telephone offices.
Prepared By : JENNIFER F. DOCOT
Public Telephone
Network (PTN)
Switching
Signaling
Data Transmission
Instrument
Station Equipment Station Subscriber
Local Loop
Trunk Circuits
112
BOOK REVIEW IN COMMUNICATIONS
Electronic Communications System By Wayne Tomasi
12)
The dedicated cable facility used to connect an instrument at a subscriber's station to the closest telephone office.
13)
Similar to local loop except trunk circuits are used to interconnect two telephone offices..
Trunk Circuits
14)
A central location where subscribers are interconnected, either temporarily or on permanent basis.
Exchange
15)
Programmable matrices that provide temporary signal paths between two subscribers.
16)
Exchanges connected directly to local loops.
Local Exchanges
17
The first commercial telephone switchboard began operation New Haven, Connecticut.
January 28, 1878
18)
The first local telephone exchanges.
19)
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.
20)
Allowed subscribers to manually dial the telephone number of the party they wished to call.
Mechanical Dialer
21)
Commonly called for stepper or step-by-step (SXS).
Strowger Switch
22)
Simply the path over which voice, data, or video signals propagate.
Prepared By : JENNIFER F. DOCOT
Local Loop
Switching Machines
Switchboards
Automated Switching System
Circuit
113
BOOK REVIEW IN COMMUNICATIONS
23)
Electronic Communications System By Wayne Tomasi
A programmable matrix that allows circuits to be connected tom one another.
Circuit Switch
24)
Telephone call completed within a single local exchange.
Intraoffice Call
25)
Telephone calls placed between two stations that are connected to different local exchanges.
Interoffice calls
26)
Another name for interoffice calls.
Interswitch Calls
27)
Telephone switching machines in local exchanges are connected to other local exchange office.
28)
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.
29)
Switches that interconnect local offices only.
30)
Trunk circuits that terminates in tandem switches.
Tandem Trunk or Intermediate Trunk
31)
Interstate long distance telephone calls require a special telephone office.
Toll Office
32)
Provides telephone numbering system for the United States, Mexico and Canada.
33)
It allows many subscriber to share a limited number of lines to a central office switch.
34)
A path between two subscribers and is comprised of one or more switches, two local loops; and possibly one or more trunk circuits.
Prepared By : JENNIFER F. DOCOT
Trunks or Interoffice Trunk
Tandem Office
Tandem
North American Telephone Numbering Plan (NANP)
Concentrator
Route
114
BOOK REVIEW IN COMMUNICATIONS
35)
Electronic Communications System By Wayne Tomasi
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
36)
A local exchange where subscriber loops terminated and received dial tone.
Class 5 End Switching Office
37)
Class 4 office having only outward and inward calling service.
Class 4P Switching Office
38)
Class 4 office provided human operators for both outward and inward calling service.
39)
Switching office that provide service to small groups of class 4 offices within a small area of a state.
40)
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
41)
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
42)
Toll trunks in tandem, excluding the two terminating links at the ends of the connection.
43)
A global standard for telecommunications defined by the ITU.
44)
Refers to the exchange of information between call components required to provide and maintain service.
Prepared By : JENNIFER F. DOCOT
Class 4C
Class 3 Primary Center
Intermediate Links
Common Channel Signaling System No. 7 (SS7 or C7) Signaling
115
BOOK REVIEW IN COMMUNICATIONS
Electronic Communications System By Wayne Tomasi
45)
An architecture for performing out of band signaling in support of common telephone system functions.
47)
Long distance access is now accomplished through an access point.
48)
A telecommunications term that describes the legal boundaries for the responsibility of maintaining equipment and transmission lines.
POP
49)
Provide access to the SS7 network, access to databases used by switches inside and outside the network.
Signaling Points
50)
Codes that are carried in signaling messages exchanged between signaling points to identify the source and destination of each messages.
Point Codes
51)
Local telephone switches equipped with SS7 compatible software and terminating signal links.
52)
The packet switches of the SS7 network.
Signal Transfer Points
53)
It serves as an interface to telephone company databases.
Service Control Points
54)
Another name for service control points.
55)
Provides access from one level of the protocol to another
