Mark and space

Mark and space are terms used in

electric telegraph

system, where the marking state would cause a mark to be output on paper, and the spacing state would create no mark.

The terms would continue to be used in systems such as RS-232, with similar conventions, that "mark" would be encoded by a negative voltage (or current flow), and "space" by a positive voltage (or no current flow).^[2] In such systems, the line is typically left in the "mark" state when idle.^[3]

"Mark" is generally identified with the

binary digit "1" and "space" with the binary digit "0".^[2]

References

^ MIL-STD-188-100, Pg. B-8, Fig. 3, 1972.
^
ISBN 978-0-471-45133-4
.

ISBN 978-0-13-902494-8
.

See also

Baud

Break key

Laws of Form

Morse code

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[1] MIL-STD-188-100, Pg. B-8, Fig. 3, 1972.

[Freeman-2] 
ISBN 978-0-471-45133-4
.

[3] ISBN 978-0-13-902494-8
.

[1]

[2]

[3]