(electricity) Telephone switchboard in which the connections are made manually, by plugs and jacks, or by keys.
manual switchboard
| Sci-Tech Dictionary: manual switchboard |
(′man·yə·wəl ′swich′börd)
| 5min Related Video: manual switchboard |
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 | line-drop signal (communications) |
| call indicator (electronics) |
| line circuit (electricity) |
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- line-drop signal (communications)
- call indicator (electronics)
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