> 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/maintenance/7800-series-maintenance-guide/7800-replace-unit-with-spare.md).

# TMG7800 Replace Unit with Spare

This procedure is used to replace a TMG7800 device with a spare device, or another unit with a normal license.

### Prerequisite

Prior to replacing hardware, you must have the following:

* Phillips screwdriver
* [TMG7800 Installation guide](/products/tmedia/installation/product-installation.md#tmg7800)

#### Retrieve spare license

* Follow the instructions here: [Retrieve a license](/other-pages/operations/telcobridges-license-server.md#retrieve-a-license)

To learn how to obtain a license key, refer to [Customer Dashboard](/operations-and-support/customer-dashboard.md)

#### Backup your system configuration

Before Proceeding with the procedure, it is wise to backup your configuration. Please follow this link: [Backup procedure](/operations-and-support/troubleshooting/software/troubleshooting-toolpack.md#system-configuration-backup)\
Note: The backup of the database should be done regularly and stored in a secure place.

### TMG7800 unit Replacement Procedure

### Removing the Defective Unit

* Shutdown the TMG7800 unit
* Disconnect from the PSTN network
* Disconnect from the VoIP network
* Disconnect from the Management network
* Remove the TMG7800 from the equipment rack

### Installing the Replacement Unit

**Refer to** [**TMG7800 Installation guide**](/products/tmedia/installation/product-installation.md#tmg7800)

* Rack-mount the Replacement Unit
* Connect to the Management Interface
* Connect to the VoIP Network
* Connect to the PSTN Network

### Starting Up the TMG7800

* Power up the TMG7800

### Pushing the configuration to the replacement unit

1- Upload the license of the new unit in the system. See [Uploading a license](/other-pages/operations/telcobridges-license-server.md#upload-a-license-on-the-system).\
2- Connect to the web portal and access the **Hardware Units** page:

`Hardware Units`

3- Identify the unit to replace and select it.\
![image:List\_of\_hardware\_units.png](https://docs.telcobridges.com/w/images/9/9a/List_of_hardware_units.png)\
4- Replace the **Serial Number** of the unit and **Save**. If the **Name** is the same as the **Serial Number**, we suggest to change this as well.\
![image:Replace\_serial\_number.png](https://docs.telcobridges.com/w/images/1/1d/Replace_serial_number.png)\
5- [Activate the configuration.](/configuration/web-portal-3-3/system/configuration/activating-the-configuration.md)


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