CHAPTER 18
THE PUBLIC TELEPHONE NETWORK
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
11)Similar to local loop except trunk circuits are used to interconnect two telephone offices.
Trunk Circuits
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)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.
Switching Machines
16)Exchanges connected directly to local loops.
Local Exchanges
17The first commercial telephone switchboard began operation New Haven, Connecticut.
January 28, 1878
18)The first local telephone exchanges.
Switchboards
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.
Automated Switching System
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.
Circuit
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.
Trunks or Interoffice Trunk
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.
Tandem Office
29)Switches that interconnect local offices only.
Tandem
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.
North American Telephone Numbering Plan (NANP)
33)It allows many subscriber to share a limited number of lines to a central office switch.
Concentrator
34)A path between two subscribers and is comprised of one or more switches, two local loops; and possibly one or more trunk circuits.
Route
23)A programmable matrix that allows circuits to be connected tom one another.
Circuit Switch
35)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.
Class 4C
39)Switching office that provide service to small groups of class 4 offices within a small area of a state.
Class 3 Primary Center
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.
Intermediate Links
43)A global standard for telecommunications defined by the ITU.
Common Channel Signaling System No. 7 (SS7 or C7)
44)Refers to the exchange of information between call components required to
provide and maintain service.
Signaling
45)An architecture for performing out of band signaling in support of common telephone system functions.
SS7
47)Long distance access is now accomplished through an access point.
Point of Presence (POP)
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.
Service Switching Points
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.
Signal Control Points
55)Provides access from one level of the protocol to another
Primitive
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