Definition of phantom circuit in English:

phantom circuit

noun

An arrangement of telegraph or other electric wires equivalent to an extra circuit.
Example sentencesExamples
- Engineers commonly called duplexed telephone circuits ‘phantom circuits’ or simply ‘phantoms.’
- If a telephone company was not happy with a gain of one circuit from two pairs, they could always take two phantom circuits, additional repeat coils and "phantom the phantoms" to obtain seven circuits over four pairs of wire.

单词	phantom circuit
释义	Definition of phantom circuit in English: phantom circuit noun An arrangement of telegraph or other electric wires equivalent to an extra circuit. Example sentencesExamples Engineers commonly called duplexed telephone circuits ‘phantom circuits’ or simply ‘phantoms.’ If a telephone company was not happy with a gain of one circuit from two pairs, they could always take two phantom circuits, additional repeat coils and "phantom the phantoms" to obtain seven circuits over four pairs of wire.
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