英语词汇“phantom circuit”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	phantom circuit
释义	phantom circuit noun An arrangement of telegraph or other electric wires equivalent to an extra circuit.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.... Engineers commonly called duplexed telephone circuits ‘phantom circuits’ or simply ‘phantoms.’
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