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In telecommunication, a neutral direct-current telegraph system (single-current system, single-current transmission system, single-Morse 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 ( electric polarity) is immaterial. [1]
This article incorporates
public domain material from
Federal Standard 1037C.
General Services Administration. Archived from
the original on 2022-01-22. (in support of
MIL-STD-188).