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A telephone exchange, telephone switch, or central office is a central component of a telecommunications system in the public switched telephone network (PSTN) or in large enterprises. It facilitates the establishment of communication circuits, enabling telephone calls between subscribers.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Telephone exchange | is a | telephone system for a small geographic area that provides the switching | 0.90 | text |
| Telephone exchange | is a | most widely used digital switching platform in the world and can be found throughout Europe and in most countries around the world | 0.90 | text |
| Hillside 834 or East 23 | instance of | having listings | 0.80 | text |
| was recognizable by the format in which the second letter was not capitalized.Rural areas | instance of | having listings | 0.80 | text |
| as well as the smallest towns | instance of | having listings | 0.80 | text |
| had manual service | instance of | having listings | 0.80 | text |
| signaling was accomplished with magneto telephones | instance of | having listings | 0.80 | text |
| which had a crank for the signaling generator | instance of | having listings | 0.80 | text |
| blown fuses | instance of | Indicator lights on equipment bays alerted staff to conditions | 0.80 | text |
| Integrated Services Digital Network | instance of | enabling digital services | 0.80 | text |
| Telephone exchange | related to Early automatic exchanges | Automatic | 0.60 | section |
| Telephone exchange | related to Early automatic exchanges | Almon Strowger | 0.60 | section |
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