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'''Network isolators''' are installed as part of a copper [[Ethernet]] system, as [[galvanic isolation|galvanic isolators]].
Network data continues to be transmitted across an electrically non-conducting barrier, through the applied principle of [[electromagnetic induction]], whereby high frequency AC voltages conveying [[Data (computing)|data]] are [[transformer|induced]] across an isolating gap. In the case of Ethernet, the data is encoded in a [[Manchester code]] for this reason.
The network isolator is therefore a [[passive device]], and functions without any requirement of an external power supply.
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