Public Switched Telephone Network
E177035
The Public Switched Telephone Network (PSTN) is the global system of interconnected, circuit-switched telephone networks that enables traditional landline voice communication worldwide.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Public Switched Telephone Network canonical | 7 |
| public switched telephone network | 4 |
| China national telephone network | 1 |
| PSTN | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1565758 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Public Switched Telephone Network Context triple: [Bell System, networkType, Public Switched Telephone Network]
-
A.
Main Telecommunication Network
Main Telecommunication Network is the core infrastructure layer that carries and routes the majority of voice, data, and multimedia traffic within the global telecommunications system.
-
B.
Bell System
The Bell System was the historic, vertically integrated telephone monopoly in the United States, led by AT&T, that dominated telecommunications services and research for much of the 20th century.
-
C.
Global Telecommunication System
The Global Telecommunication System is an international network for the real-time exchange of meteorological and related data that underpins global weather forecasting and climate monitoring.
-
D.
Southern Telecom
Southern Telecom is a telecommunications subsidiary of Southern Company that provides fiber-optic network and related communication services.
-
E.
Bell Canada
Bell Canada is a major Canadian telecommunications company providing phone, internet, and television services nationwide.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Public Switched Telephone Network Target entity description: The Public Switched Telephone Network (PSTN) is the global system of interconnected, circuit-switched telephone networks that enables traditional landline voice communication worldwide.
-
A.
Main Telecommunication Network
Main Telecommunication Network is the core infrastructure layer that carries and routes the majority of voice, data, and multimedia traffic within the global telecommunications system.
-
B.
Bell System
The Bell System was the historic, vertically integrated telephone monopoly in the United States, led by AT&T, that dominated telecommunications services and research for much of the 20th century.
-
C.
Global Telecommunication System
The Global Telecommunication System is an international network for the real-time exchange of meteorological and related data that underpins global weather forecasting and climate monitoring.
-
D.
Southern Telecom
Southern Telecom is a telecommunications subsidiary of Southern Company that provides fiber-optic network and related communication services.
-
E.
Bell Canada
Bell Canada is a major Canadian telecommunications company providing phone, internet, and television services nationwide.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
circuit-switched network
ⓘ
global communications infrastructure ⓘ telecommunications network ⓘ |
| abbreviation |
Public Switched Telephone Network
self-linksurface differs
ⓘ
surface form:
PSTN
|
| accessedBy |
landline telephones
ⓘ
private branch exchanges ⓘ public payphones ⓘ |
| alsoKnownAs | plain old telephone service network ⓘ |
| characteristic |
connection-oriented communication
ⓘ
quality-of-service suitable for real-time voice ⓘ |
| composedOf |
interconnected national telephone networks
ⓘ
international gateway exchanges ⓘ local exchange networks ⓘ signaling networks ⓘ subscriber lines ⓘ telephone exchanges ⓘ toll networks ⓘ trunk lines ⓘ |
| currentTechnology |
digital switching
ⓘ
fiber-optic transmission ⓘ time-division multiplexing ⓘ |
| enables | traditional landline voice communication ⓘ |
| evolvedFrom | manual telephone exchanges ⓘ |
| evolvedTo | largely digital core network ⓘ |
| governedBy | telecommunications law ⓘ |
| historicalTechnology |
analog voice transmission
ⓘ
electromechanical switching ⓘ |
| interworksWith |
ISDN
ⓘ
surface form:
Integrated Services Digital Network
Voice over IP networks ⓘ mobile networks ⓘ |
| originPeriod | late 19th century ⓘ |
| primaryFunction | establishing end-to-end voice circuits ⓘ |
| regulatedBy | national telecommunications regulators ⓘ |
| scope | global ⓘ |
| standardizedBy |
ITU Telecommunication Standardization Sector
ⓘ
surface form:
ITU-T
International Telecommunication Union ⓘ |
| supportsService |
dial-up data communication
ⓘ
fax transmission ⓘ voice telephony ⓘ |
| threatenedBy |
decline of traditional landlines
ⓘ
migration to all-IP networks ⓘ |
| usedFor |
business telephony
ⓘ
emergency calling services ⓘ residential telephony ⓘ |
| usesNumberingPlan | E.164 international numbering plan ⓘ |
| usesSignalingSystem |
SS7
ⓘ
Signaling System No. 7 ⓘ |
| usesSwitchingType | circuit switching ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Public Switched Telephone Network Description of subject: The Public Switched Telephone Network (PSTN) is the global system of interconnected, circuit-switched telephone networks that enables traditional landline voice communication worldwide.
Referenced by (13)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
public switched telephone network
this entity surface form:
public switched telephone network
Public Switched Telephone Network
→
abbreviation
→
Public Switched Telephone Network
self-linksurface differs
ⓘ
this entity surface form:
PSTN
this entity surface form:
China national telephone network
this entity surface form:
public switched telephone network
this entity surface form:
public switched telephone network