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Common-mode interference

In telecommunication, the term common-mode interference has the following meanings:

1. Interference that appears between signal leads, or the terminals of a measuring circuit, and ground.

2. A form of coherent interference that affects two or more elements of a network in a similar manner (i.e. , highly coupled) as distinct from locally generated noise or interference that is statistically independent between pairs of network elements.

Source: from Federal Standard 1037C and from MIL-STD-188

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