Comcast Tests New DOCSIS 4.0 Technology for Symmetrical Multi-Gig Internet
Comcast has begun field trials of a new Aurora Networks DOCSIS 4.0 node and is testing new amplifiers designed to make its next-generation cable upgrades more flexible and easier to deploy.
Comcast has started field trials of Aurora Networks’ OM6180 unified DOCSIS 4.0 node. The new hardware supports both Full Duplex DOCSIS and Extended Spectrum DOCSIS, giving Comcast more flexibility as it expands symmetrical multi-gigabit Xfinity service over its existing hybrid fiber-coaxial network.
Comcast is also testing Aurora’s next-generation smart amplifier in the lab. The amplifier supports both DOCSIS 4.0 architectures up to 1.8 GHz and is designed to fit existing Starline BLE housings, which could reduce installation time and disruption during upgrades.
What Comcast is testing
The September 29 announcement covers two pieces of outside-network hardware. One is already being tested in Comcast’s live network; the other is still in the lab.
The OM6180 supports both Full Duplex and Extended Spectrum DOCSIS 4.0 on a common platform. Comcast says it integrates with the company’s existing FDX deployments while giving the operator more options for future upgrades.
The smart amplifier supports both FDX and ESD architectures up to 1.8 GHz. Aurora says it can reuse existing Starline BLE housings, creating a more practical upgrade path for amplified parts of a cable network.
That flexibility matters because Comcast’s cable plant is not identical everywhere. Some neighborhoods have different node and amplifier layouts, so one upgrade design does not fit every street.
Why DOCSIS 4.0 matters for Xfinity
For decades, cable broadband has generally offered much faster downloads than uploads. DOCSIS 4.0 is designed to remove much of that imbalance by increasing upstream capacity while continuing to use upgraded hybrid fiber-coaxial infrastructure.
| Feature | DOCSIS 3.1 | DOCSIS 4.0 |
|---|---|---|
| Downstream capacity | Up to 10 Gbps in the specification | Up to 10 Gbps in the standard specification |
| Upstream capacity | About 1–2 Gbps depending on implementation | Up to 6 Gbps |
| Consumer benefit | Fast gigabit and multi-gig downloads | Much faster uploads and symmetrical multi-gig tiers |
| Access network | Hybrid fiber-coaxial | Upgraded hybrid fiber-coaxial |
CableLabs says DOCSIS 4.0 supports up to 10 Gbps downstream capacity and up to 6 Gbps upstream. Those are network-technology limits rather than guaranteed speeds for one household. If you want the technology itself explained in more detail, our DOCSIS 4.0 guide covers its speed limits, upload improvements, Full Duplex and Extended Spectrum approaches, and the U.S. rollout.
DOCSIS 4.0 builds on the standard already used across much of today’s cable network. Our DOCSIS 3.1 explainer explains the previous generation and why it remains widely used alongside newer DOCSIS 4.0 deployments.
What could this mean for Xfinity customers?
The clearest benefit is wider access to fast upload speeds. That matters for cloud backup, large file transfers, livestreaming, remote work and homes where several people make video calls at once. If you’re comparing the difference between today’s cable plans and equal-speed services, our guide to asymmetrical vs. symmetrical internet explains why upload speeds are often much lower than downloads.
Comcast already sells X-Class symmetrical tiers in selected DOCSIS 4.0 areas. Its original X-Class lineup included symmetrical 300 Mbps, 500 Mbps, 1 Gbps and 2 Gbps plans.
The Aurora trial does not mean those tiers are suddenly available across the entire Xfinity footprint. Local plant upgrades, compatible equipment and address-level availability still matter.
Most Xfinity customers still receive service over a hybrid fiber-coax network, with coaxial cable completing the final connection to the home. Our guide to how Xfinity’s cable-and-fiber network works explains why DOCSIS upgrades can improve uploads without converting every address to fiber-to-the-home.
Why Comcast wants both FDX and ESD
DOCSIS 4.0 gives operators more than one way to upgrade an HFC network. Comcast has been a major adopter of Full Duplex DOCSIS, which can use the same spectrum for upstream and downstream traffic at the same time, while Extended Spectrum DOCSIS increases the amount of spectrum available to the cable network. Our guide to Full Duplex and Extended Spectrum DOCSIS 4.0 explains the difference between the two approaches.
Designed to increase upstream capacity while preserving downstream performance.
Expands the usable frequency range of the cable plant.
The OM6180 gives Comcast a common platform for either architecture.
Supports FDX and ESD while reusing existing amplifier housings.
Comcast has already deployed FDX nodes and amplifiers in live service. The new Aurora hardware gives it another way to extend DOCSIS 4.0 across areas with different network designs.
This is an infrastructure trial, not a nationwide Xfinity speed announcement. The significance is that Comcast is testing equipment that could make future DOCSIS 4.0 deployment easier across more of its cable footprint.
The bottom line
Comcast’s latest DOCSIS 4.0 trial is about making symmetrical multi-gig cable broadband easier to expand. The Aurora OM6180 unified node is already in field trials, while a new 1.8 GHz smart amplifier is undergoing lab testing.
Both products support Full Duplex and Extended Spectrum DOCSIS 4.0. For customers, the eventual payoff should be broader availability of faster uploads and symmetrical Xfinity tiers over existing cable infrastructure.
There is no new nationwide Xfinity rollout date attached to the announcement, so customers still need to check their exact address. Our Xfinity Internet review covers the current service and the address-level limits around X-Class availability.
Comcast DOCSIS 4.0 FAQs
What new DOCSIS 4.0 technology is Comcast testing?
Comcast has begun field trials of Aurora Networks’ OM6180 unified DOCSIS 4.0 node. It is also conducting lab tests of Aurora’s next-generation smart amplifier, which supports both Full Duplex and Extended Spectrum DOCSIS 4.0 architectures up to 1.8 GHz.
Will the new DOCSIS 4.0 equipment make Xfinity symmetrical?
The equipment is designed to help Comcast expand DOCSIS 4.0, which supports symmetrical multi-gigabit service. Availability still depends on local network upgrades, compatible equipment and the plans offered at an address.
Does DOCSIS 4.0 require fiber to the home?
No. DOCSIS 4.0 can deliver much higher capacity over upgraded hybrid fiber-coaxial networks, so coax can remain the final connection at many homes.
How fast can DOCSIS 4.0 be?
CableLabs says the DOCSIS 4.0 specification supports up to 10 Gbps downstream capacity and up to 6 Gbps upstream. Those figures are technology capacities, not guaranteed retail speeds.
Sources
- Aurora Networks / Vistance Networks: Comcast DOCSIS 4.0 field trial announcement, September 29, 2026
- Comcast: Project Genesis and DOCSIS 4.0 network transformation
- Comcast: Initial X-Class DOCSIS 4.0 deployment
- Comcast: Live Full Duplex DOCSIS amplifier and node deployment
- CableLabs: DOCSIS 4.0 capacity and architecture overview