Mark and space

Nowadays, Mark and space is a topic that has gained great relevance in today's society. Over time, it has become a fundamental aspect that affects numerous aspects of daily life. There are many people who have been influenced by Mark and space, either directly or indirectly. For this reason, it is vitally important to delve into all aspects related to Mark and space in order to understand its impact on our reality. In this article, we will delve into the exciting world of Mark and space, exploring its origins, evolution and consequences in different areas. Along these lines, we will discover the importance that Mark and space has acquired in the modern world and how it has become a topic of debate and reflection in today's society.

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.

7-bit Asynchronous Data Communication surrounded by start, parity and end elements including one "0" (spacing) start element and one "1" (marking) stop element[1]
Diagram of RS-232 signalling for an uppercase ASCII "K" character (0x4b) with 1 start bit, 8 data bits, 1 stop bit. Mark and Space depict negative and positive voltage levels.

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]

See also

References

  1. ^ MIL-STD-188-100, Pg. B-8, Fig. 3, 1972.
  2. ^ a b Freeman, Roger L. (2004-06-11). Telecommunication System Engineering. John Wiley & Sons. ISBN 978-0-471-45133-4.
  3. ^ Martin, James; Martin, James Thomas; S.J, James Martin (1976). Telecommunications and the Computer. Prentice Hall Professional. ISBN 978-0-13-902494-8.


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