Statements (50)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb: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 |
| gptkbp:popularFor |
gptkb:Canada
gptkb:United_Kingdom gptkb:United_States |
| gptkbp:predecessor |
Private branch exchange (PBX)
|
| gptkbp:relatedTo |
gptkb:PBX
gptkb:Intercom_system gptkb:Telephone_exchange Telecommunications Business communications 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
gptkb:Private_branch_exchange |
| gptkbp:bfsLayer |
7
|
| https://www.w3.org/2000/01/rdf-schema#label |
Key telephone system
|