> For the complete documentation index, see [llms.txt](https://docs.blockcast.network/main/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.blockcast.network/main/overview/control-plane.md).

# Building Blocks

## [Data Plane](broken://pages/pNO22VQUMw3CqP5jhCrF)

The data plane implements the content delivery path — from ingestion at CAST nodes, through multicast distribution across RELAY infrastructure, to playback on BEACON receivers at the deep network edge.

Blockcast's data plane follows the **TreeDN** architecture ([RFC 9706](https://datatracker.ietf.org/doc/rfc9706/)), combining Source-Specific Multicast (SSM) with Automatic Multicast Tunneling (AMT) overlays for efficient, tree-structured content delivery to mass audiences.

* [**TreeDN: Multicast Content Delivery**](/main/overview/control-plane/treedn-multicast.md) — Architecture overview, layered design, control plane, CAST sender, failover, and standards references.
  * [**AMT Relays & Multicast Backbone**](/main/overview/control-plane/treedn-multicast/amt-relays.md) — How multicast bridges unicast-only networks. Covers Juniper MX hardware relays, Linux software relays, DRIAD discovery, and unified monitoring.
  * [**MAHP: Multicast Adaptive HTTP Proxy**](/main/overview/control-plane/treedn-multicast/mahp.md) — High-throughput broadcast delivery via ROUTE/FLUTE. Covers the MAHP Sender, Receiver, FEC repair, encrypted caching, and how unmodified DASH/HLS players are served transparently.
  * [**MoQ & MMT: Streaming Delivery Paths**](/main/overview/control-plane/treedn-multicast/moq.md) — Sub-500ms delivery via QUIC/WebTransport and the unified MMT container format. Covers MoQ Relay forwarding, IWA browser gateway, Mobile SDK, delivery paths across ATSC 3.0/5G MBS/PIM-SSM/AMT, and end-to-end flows.
* [**Traffic Router**](/main/overview/control-plane/traffic-router.md) — DNS, HTTP, and DRIAD routing modes for directing clients to optimal edge nodes.