Statements (18)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
telephone switch
|
| gptkbp:alsoKnownAs |
Number Four Electronic Switching System
|
| gptkbp:architecture |
time-division switching
|
| gptkbp:controls |
gptkb:1A_processor
|
| https://www.w3.org/2000/01/rdf-schema#label |
4ESS
|
| gptkbp:introduced |
1976
|
| gptkbp:location |
gptkb:United_States
|
| gptkbp:manufacturer |
gptkb:Western_Electric
|
| gptkbp:replacedBy |
crossbar switches
|
| gptkbp:status |
legacy system
|
| gptkbp:successor |
gptkb:5ESS
|
| gptkbp:technology |
electronic switching system
|
| gptkbp:usedBy |
gptkb:AT&T
|
| gptkbp:usedFor |
tandem switching
long-distance switching trunk switching |
| gptkbp:bfsParent |
gptkb:No._4ESS_switch
|
| gptkbp:bfsLayer |
6
|