> 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/telecom-references/protocols/ds3-interfaces.md).

# DS3 Interfaces

The Tmedia [TMG3200](https://telcobridges.com/media-gateways/products/tmedia-gateways/tmg3200/), [TMG7800](https://telcobridges.com/media-gateways/products/tmedia-gateways/tmg7800/) and Tdev [TMP6400](https://telcobridges.com/products/development-platforms-tdev/tmp6400-tdev-voip-gateway-development-platform/) TDM hardware adapter provides an interface of up to 3 DS3 lines.

For each DS3 line that the Tmedia or Tdev device will use, a line interface with related line services are configured. The DS3 interface can be configured in a one-to-one relationship with DS3 line services; however, unlike a T1/E1/J1 interface, the DS3 line service can be configured to contain subordinate child line services carrying lower bandwidth payload. A conceptual image is shown below:

![Schematic DS3 interfaces](https://docs.telcobridges.com/w/images/6/6f/Schematic-DS3-interfaces.jpg)

### Using BITS ports for signaling

Starting with release 2.3 of [Toolpack](https://telcobridges.com/products/development-platforms-tdev/), it is possible to convert unused BITS ports into [signaling ports](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/transmission/signaling-ports/README.md), with indices of 1 and 0 respectively, in order to recover a channel on the primary DS3 connection.


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