> For the complete documentation index, see [llms.txt](https://gsm.learn-telecom.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gsm.learn-telecom.com/gsm-channels/signalling-channels/common-control-channels/point-to-multipoint-channels.md).

# Point-to-Multipoint Channels

## Downlink

### PCH - Paging Channel

Used from BTS to MS when the subscriber is **called.**

### AGCH - Access Grant Channel

It asign resources to a SDCCH channel.

## Uplink

### RACH - Random Access Channel

Used from MS to BTS when subscriber makes a call.