10G Technology

DOCSIS® 4.0 Technology

DOCSIS 4.0 technology enables the next generation of broadband over cable’s hybrid fiber coax (HFC) networks, delivering symmetrical multi-gigabit speeds while supporting high reliability, high security and low latency.

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 Mbps200 Mbps1-2 Gbps6 Gbps
First Specification Issue Date199619992001200620132019


The performance numbers above are based on specifications; deployed network performance will vary across implementations.


What are Full Duplex (FDX) DOCSIS technology and Extended Spectrum DOCSIS (ESD) technology?

FDX DOCSIS technology refers to the ability of network devices to simultaneously transmit both upstream and downstream in the same spectrum, specifically in the spectral region between 108 MHz and 684 MHz, while downstream-only spectrum extends from 684 MHz up to 1.2 GHz. Extended Spectrum technology refers to leveraging the traditional frequency division duplex (FDD) mode of operation but extending the upstream-only spectrum up to 684 MHz while also extending the downstream-only spectrum up to 1.8 GHz.

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What is the difference between DOCSIS 3.1 specifications and 4.0 specifications?

The difference in specifications is an increase in upstream capacity and more options for operators to increase downstream capacities. Current DOCSIS 3.1 cable modems support capacities up to 5 Gbps downstream and 1.5 Gbps upstream. DOCSIS 4.0 cable modems will support capacities up to 10 Gbps downstream and 6 Gbps upstream.

How did CableLabs and the industry cooperate to develop DOCSIS 4.0?

In June 2016, FDX technology transitioned from an innovation project to an industry-wide R&D effort led by CableLabs. It was originally introduced in the DOCSIS 3.1 suite of specifications. CableLabs moved FDX 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).

Where can I find DOCSIS 3.1 technology resources?

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


How does DOCSIS 4.0 technology contribute to 10G?

DOCSIS 4.0 technology is a major step toward reaching the industry’s 10G goal. With full duplex and extended spectrum capabilities integrated into next-generation DOCSIS 4.0 technology, the industry will be able to deliver on that 10 Gbps promise over hybrid fiber coax networks. Learn more about the road to 10G and its technologies.