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Neutral_direct-current_telegraph_system.
Neutral direct-current telegraph system
In telecommunication, a neutral direct-current telegraph system (single-current system, single-current transmission system, single-More 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.
Source: from Federal Standard 1037C and from MIL-STD-188
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