# Downstream CDN

A CDN is an entity that provides internet media origins scaling services in capacity footprints organized by node capabilities, country, region, or audience IP address ranges. It may peer with operators, or own the networks or the nodes on them it orchestrates into delivery tiers to fan out traffic to clients with the highest throughput, and least amount of resources. It seeks partnership with peer node operators across footprints, or owns its own infrastructure. The CDN scale traffic from content provider origin servers to clients in these different regions, shielding them from excessive load, replicating content storage in each desired region, and optimally routing user traffic to the nearest servers.

 

<figure><img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXf7tkxVkJLIGPIhChJWvofqopZ6Z8jC8JB6ir5isA_DXbCkrIX2dPIJcxsrziT8YgFXq-twroVz_CzfTA3EUtmviQ14MvlcpTdbqGTu3kQia7vSfZVEcli8SdhoarxWZuOtd6dsvCjqeXZU9r9bVPJDRAvX?key=rUAtSF88doEQot6P43JZKQ" alt=""><figcaption></figcaption></figure>

Using Blockcast’s multicast backbone infrastructure, CDNs can coalesce millions of requests in ISP networks into a single adaptive bitrate stream that enables the delivery of much higher-quality media with a fraction of the resources.

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CDNs implement the SVTA Open Caching / IETF CDN interconnection downstream interface to offload services from upstream content providers and CDNs in the marketplace.  An open CDN implementation is available to be run by other organizations like ISPs or broadcasters who want to participate as independent capacity providers and compete with differentiated services to content providers, and terms for nodes within their network.&#x20;

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