> 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/hsl.md).

# HSL

High Speed Link (HSL) refers to a single MTP2 link that uses the entire bandwidth of a trunk to transport MTP2 data.

The difference between a HSL MTP2 link and a Nx64/56kbps MTP2 link is that the Nx64/56kbps link uses many (N) independent [timeslots](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/transmission/timeslot/README.md), instead of all the [timeslots](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/transmission/timeslot/README.md). The HSL link and Nx64/56kbps link use a single [HDLC](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/hdlc/README.md) receiver/transmitter that is not bound by a timeslot's normal 7/8 bit boundary like it is for a low speed link (LSL). The HSL can use the complete bandwidth of a channelized trunk to transmit data. All MTP2 links on channelized T1/E1 trunks can be switched via digital cross-connect equipment that can handle the timeslot level.

### References

* [Wikipedia article](http://en.wikipedia.org/wiki/Signaling_System_7)


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