Statements (49)
Predicate | Object |
---|---|
gptkbp:instanceOf |
Telecommunications system
|
gptkbp:advantage |
Low cost
Easy installation Limited scalability Limited features compared to PBX Manual line selection required Simple operation |
gptkbp:category |
Business equipment
Telephony Office equipment |
gptkbp:controlledBy |
Key service unit (KSU)
|
gptkbp:developedBy |
20th century
|
gptkbp:hasComponent |
Indicator lamps
Intercom buttons Key service unit (KSU) Key telephone Line buttons |
gptkbp:hasConnection |
Intercom lines
Private lines Public switched telephone network (PSTN) |
gptkbp:hasFeature |
Direct line selection
Intercom capability Line status indication Multiple telephone lines |
gptkbp:hasType |
1A2 Key System
Electronic key telephone system (EKTS) Hybrid key system KSU-less system |
https://www.w3.org/2000/01/rdf-schema#label |
Key telephone system
|
gptkbp:popularFor |
gptkb:Canada
gptkb:United_Kingdom gptkb:United_States |
gptkbp:predecessor |
Private branch exchange (PBX)
|
gptkbp:relatedTo |
gptkb:PBX
Telecommunications Telephone exchange Business communications Intercom system Hybrid system 1A2 Key System Electronic key telephone system (EKTS) KSU-less system Multi-line telephone |
gptkbp:replacedBy |
PBX systems
|
gptkbp:standardizedBy |
gptkb:Bell_System
|
gptkbp:usedFor |
Business telephone service
|
gptkbp:usedIn |
Small and medium businesses
|
gptkbp:bfsParent |
gptkb:PBX
|
gptkbp:bfsLayer |
6
|