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Cable operators are interested in deploying high-speed data communications systems on cable television systems. A series of interface specifications has have been prepared that will permit the early definition, design, development, and deployment of packet data over cable systems.
The data over cable service interface specification (DOCSIS) specifies the protocol for exchanging bidirectional transfer of Internet protocol (IP) traffic, between the cable system headend and customer locations.

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RDK-B was designed to support any wide area network (WAN) type e.g DOCSIS, EPON. Gateways using RDK-B may provide a DOCSIS interface, but that DOCSIS code is typically tied to a particular piece of silicon and may even be provided by that silicon vendor. And the core philosophy of RDK-B was to be hardware and WAN type independent.

To address this situation, RDK-B does not include DOCSIS. It only includes components that provide an abstraction layer software interface to third party WAN. For the DOCSIS WAN, this component is known as the Cable Modem (CM) Agent. CM Agent provides interfaces for integrating WAN interfaces with RDK-B. RDK-B is not tied to DOCSIS and may be used with any WAN interface. Other RDK-B software components can be created that provide interfaces to other WANs.

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