No. 4D toll switching system
GPTKB entity
Statements (13)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
telephone switching system
|
| gptkbp:developedBy |
gptkb:Bell_Labs
|
| https://www.w3.org/2000/01/rdf-schema#label |
No. 4D toll switching system
|
| gptkbp:introducedIn |
1976
|
| gptkbp:manufacturer |
gptkb:Western_Electric
|
| gptkbp:replacedBy |
gptkb:5ESS_switch
gptkb:No._4A_toll_switching_system |
| gptkbp:roadType |
gptkb:public_switched_telephone_network
|
| gptkbp:technology |
digital switching
|
| gptkbp:usedFor |
long-distance telephone switching
|
| gptkbp:usedIn |
gptkb:North_America
|
| gptkbp:bfsParent |
gptkb:Bell_System
|
| gptkbp:bfsLayer |
5
|