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Neutral direct-current telegraph system

In telecommunication, a neutral direct-current telegraph system is a telegraph system in which (a) current flows during marking intervals and no current flows during spacing intervals for the transmission of signals over a line, and (b) the direction of current flow is immaterial. Synonyms single-current system, single-current transmission system, single-Morse system.

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

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