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this post was submitted on 03 Oct 2023
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Linux
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From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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An OTDR sends pulses of laser light into a fiber optic cable and records the minute reflections that occur at every point of the cable over time. The time of arrival of the reflections corresponds to the position of where it was reflected. This way you can record the attenuation of an entire cable just from shining in pulses from one end. Good for checking if a new cable was properly installed, or for finding the location of issues in existing cables for debugging.