> 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/tdm-interfaces.md).

# Tdm Interfaces

### [E1/T1](https://tmediadocs.telcobridges.com/telecom-references/transmission-and-lines/t1-e1-and-j1-interfaces), [DS3](https://tmediadocs.telcobridges.com/telecom-references/transmission-and-lines/ds3-interfaces)

For a [TMG7800](/products/tmedia/tmg7800.md) system that contains multiple telecom units, it is recommended to load share the line interfaces between providers. This will make your service fault tolerant. This is the same principle as the signaling protocol load sharing.

Here is an example of a [TMG7800](/products/tmedia/tmg7800.md) that load shares its [DS3](https://tmediadocs.telcobridges.com/telecom-references/transmission-and-lines/ds3-interfaces) interfaces to create a service fault tolerant system.

![TMG7800 Line Interface Load sharing](https://docs.telcobridges.com/w/images/6/69/Ha_TMG7800_TDM_Load_Share.png)

The service is still available even if a telecom unit fails

![TMG7800 Fault Tolerant Service](https://docs.telcobridges.com/w/images/7/70/Ha_TMG7800_TDM_Load_Share_Fail.png)

### [STM-1/OC-3](https://tmediadocs.telcobridges.com/telecom-references/transmission-and-lines/stm-1)

The [STM-1/OC-3](https://tmediadocs.telcobridges.com/telecom-references/transmission-and-lines/stm-1) is the only inherently redundant line interface. TelcoBridges TMG7800-STM1 and TMG3200-STM1 support [APS](https://tmediadocs.telcobridges.com/telecom-references/transmission-and-lines/automatic-protection-switching).


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