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10G Technology

DOCSIS® 4.0 Technology

Formerly Full Duplex DOCSIS technology, DOCSIS 4.0 technology is the result of applying emerging techniques from wireless networks to achieve a breakthrough increase in DOCSIS upstream speeds.

HighlightsInitial cable broadband technology, high speed internet accessAdded voice over IP service, gaming, streamingHigher upstream speed, capacity for symmetric servicesGreatly enhances capacity, channel bonding, IPv6Capacity and efficiency progression, OFDM, wideband channelSymmetrical streaming and increased upload speeds
Downstream Capacity40 Mbps40 Mbps40 Mbps1 Gbps10 Gbps10 Gbps
Upstream Capacity10 Mbps10 Mbps30 Mbps100 Mbps1-2 Gbps10 Gbps
First Specification Issue Date199619992001200620132019*

*Full Duplex DOCSIS was originally introduced in 2017 as part of DOCSIS 3.1.


What is DOCSIS® 4.0 technology?

DOCSIS® 4.0 technology is an extension of the DOCSIS 3.1 specifications that will significantly increase upstream capacity and enable symmetric multi-Gbps services over existing HFC networks. DOCSIS 4.0 technology builds on the successful completion of the DOCSIS 3.1 specifications, which will make 10 Gbps downstream and 1 Gbps upstream broadband speeds a reality.

How did DOCSIS 4.0 evolve?

CableLabs has a rich involvement with academic institutions in the USA and around the world. As part of CableLabs engagement with academia, we were following ongoing research in the wireless industry and identified wireless full duplex as a technology that could be applied to cable networks, and most importantly, leverages the existing investment in HFC infrastructure. CableLabs leveraged the FDX communication concept, and developed a solution that is ideal for the HFC network architecture and characteristics.

How does DOCSIS 4.0 work?

By leveraging the combination of DOCSIS 3.1 technology, passive HFC network characteristics, self-interference cancellation technology and intelligent scheduling, CableLabs has developed a solution that enables full duplex communications over the HFC network while still maintaining backward compatibility with previous generations of DOCSIS technology.

In full duplex communication, the upstream and downstream traffic concurrently use the same spectrum, doubling the efficiency of spectrum use. With current DOCSIS networks and TDD (Time Division Duplexing), spectrum is split between the upstream and downstream. Full Duplex communication enables upstream and downstream traffic to efficiently use the same spectrum at the same time.

How does DOCSIS 4.0 benefit consumers?

Full Duplex DOCSIS technology enables Multi-Gbps symmetrical services possible over the existing HFC networks thus supporting future applications with high upstream traffic demand such as sensor networks, virtual reality, smart cars, the tactile internet and new applications not yet imagined.

Full Duplex DOCSIS technology can be introduced with no disruption to the consumer as it is backward compatible with previous DOCSIS technologies and works with existing HFC infrastructure.

How is CableLabs and the industry cooperating to develop DOCSIS 4.0?
  • In June 2016, Full Duplex technology transitioned from an innovation project to an industry-wide R&D effort led by CableLabs. It was originally introduced in the 3.1 suite of specifications.
  • CableLabs moved Full Duplex requirements from DOCSIS 3.1 to DOCSIS 4.0 specifications in August 2019.
  • Vendors and member cable operators of CableLabs continue to collaborate on further developing DOCSIS 4.0 to include Extended Spectrum DOCSIS (up to 1.8 GHz).
  • Cisco has contributed a silicon reference design to accelerate the technology’s development and deployment.
Where can I find DOCSIS 3.1 resources?

DOCSIS 3.1 information and resources can be found in its new home URL:


Where does Full Duplex DOCSIS fall under?

DOCSIS 4.0, first issued in 2019, now contains Full Duplex requirements exclusively; however, Full Duplex was originally introduced in 2017 as part of DOCSIS 3.1.