> For the complete documentation index, see [llms.txt](https://tmediadocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tmediadocs.telcobridges.com/products/tmedia/features-and-solutions/features/redundancy-and-high-availability/clocking-sources.md).

# Clocking Sources

The Tmedia/Tdev system requires that all of its component Tmedia/Tdev devices be in synchronization with each other.

With an eye on flexibility, clocking sources can be configured to generate from either internal clocking sources originating from any Tmedia unit or from more reliable clocking sources, such as a T1 line. In addition, multiple clocking sources can be configured, to guarantee against the failure of any one clocking source, which could cause system synchronization problems. A conceptual illustration is provided below.

![Figure clocking sources](https://docs.telcobridges.com/w/images/8/8f/Figure-clocking-sources.jpg)

### Other actions

* [Verifying the Current Clocking Soure](/configuration/web-portal-3-3.md)
* [Creating a Clocking Source](/configuration/web-portal-3-3.md)


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