Mark and space
Mark and space are terms used in telecommunications to describe two different signal states of a communications signal, generally at the physical layer of a communications system. The terms derive from the early days of the 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). In such systems, the line is typically left in the "mark" state when idle.

"Mark" is generally identified with the binary digit "1" and "space" with the binary digit "0".
Q418
telecommunications
Concept
Q192727
physical layer
Concept
Q6501061
electric telegraph
Concept
Q191895
RS-232
MISC
Q8805
binary digit
Concept
Q97349450
Mark and space
UNK
-232^^http://www.w3.org/2001/XMLSchema#decimal
-232
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
0^^http://www.w3.org/2001/XMLSchema#decimal
0
NUMBER
use