> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/tmedia-documentation/configuration/creating-a-system-clock.md).

# Creating a System Clock

> **Applies to:** Tmedia 3.0, 3.2, 3.3

An external clock ensures that the system time is synchronized.

To create an external system clock reference:

1- Select **Clocking** from the navigation panel

![CreateSystemClock A 0](https://docs.telcobridges.com/w/images/3/39/CreateSystemClock_A_0.png)

2- Click **Create New External System Clock Reference**.

![CreateSystemClock A 1](https://docs.telcobridges.com/w/images/f/fe/CreateSystemClock_A_1.png)

3- Enter values for the clock.

* Enter a **name** for the new clock.
* Select an available **Unit**.
* Select a **Clock Ref Type** .
* Select a **Clock Ref Source**.
* Click **Create**.

![CreateSystemClock A 2](https://docs.telcobridges.com/w/images/e/ec/CreateSystemClock_A_2.png)

4- The new clock is displayed in the **External System Clock Reference List**.

![CreateSystemClock A 3](https://docs.telcobridges.com/w/images/c/c3/CreateSystemClock_A_3.png)

**Note** **Use TMS Link Switch Over Recovery** is only used for the TMG7800

### List of Parameters

* [Name](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/name/README.md)
* [Unit](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/unit/README.md)
* [Clock Ref Type](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/clock-ref-type/README.md)
* [Clock Ref Type](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/clock-ref-type/README.md)
* [Use Clock Ref Recovery](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/use-clock-ref-recovery/README.md)
* [Use TMS Link Switch Over Recovery](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/use-tms-link-switch-over-recovery/README.md)

**Advanced Parameters**

* [Qualify Delay](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/qualify-delay/README.md)
* [Qualify Recovery Delay](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/qualify-recovery-delay/README.md)
* [Trunk LOS defects (unqualify mark)](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/trunk-los-defects-unqualify-mark/README.md)
* [Trunk LOS defects (qualify mark)](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/trunk-los-defects-qualify-mark/README.md)
* [Trunk OOF defects (unqualify mark)](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/trunk-oof-defects-unqualify-mark/README.md)
* [Trunk OOF defects (qualify mark)](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/trunk-oof-defects-qualify-mark/README.md)
* [Trunk FEC anomalies (unqualify mark)](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/trunk-fec-anomalies-unqualify-mark/README.md)
* [Trunk FEC anomalies (qualify mark)](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/trunk-fec-anomalies-qualify-mark/README.md)
* [Trunk CVC anomalies (unqualify mark)](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/trunk-cvc-anomalies-unqualify-mark/README.md)
* [Trunk CVC anomalies (qualify mark)](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/trunk-cvc-anomalies-qualify-mark/README.md)


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