Statements (38)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
telephone system
|
| gptkbp:category |
industrial equipment
business telephony key telephone system |
| gptkbp:component |
gptkb:battery
ringer intercom unit key service unit (KSU) key telephone set |
| gptkbp:developedBy |
gptkb:Western_Electric
|
| gptkbp:features |
intercom
hold function lamp signaling multiple line appearance |
| https://www.w3.org/2000/01/rdf-schema#label |
1A2 Key Telephone System
|
| gptkbp:introducedIn |
1964
|
| gptkbp:legacy |
widely used in 1960s-1980s
|
| gptkbp:marketedAs |
gptkb:AT&T
|
| gptkbp:notableModel |
WECO 118A ringer
WECO 400D KTU WECO 401A KTU WECO 403A KTU WECO 407A KTU WECO 51A intercom WECO 565 telephone WECO 584 KSU |
| gptkbp:powerSource |
24V DC
|
| gptkbp:replacedBy |
electronic key systems
predecessor key systems |
| gptkbp:standardizedBy |
gptkb:Bell_System
|
| gptkbp:successor |
electronic key telephone systems (EKTS)
|
| gptkbp:usedFor |
business telephone service
|
| gptkbp:usedIn |
gptkb:North_America
|
| gptkbp:uses |
25-pair cable
modular key telephone units (KTUs) |
| gptkbp:wiringStandard |
25-pair Amphenol connector
|
| gptkbp:bfsParent |
gptkb:No._1A1_switch
|
| gptkbp:bfsLayer |
6
|