Comcast tests 10G modem prototype at download speed of 4 gigabits per second

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Comcast said it has successfully tested a prototype 10G modem using core technology that can deliver multigigabit speeds to millions of homes.

In lab tests, the full Duplex DOCSIS 4.0 system-on-chip (SoC) cable modem built by Broadcom offers upload and download speeds of more than 4 gigabits per second (Gbps) powered by 10G network technology.

It is the latest in a series of 10G milestones from Comcast. In October 2021, the company announced the successful test of a complete 10G connection using a Virtualized Cable Modem Termination System (vCMTS) powered by DOCSIS 4.0 technology.

The announcement follows the first live lab test of the 10G system-on-chip (SOC) in April 2021 and the main 10G milestone announcements of the trial in October 2020 providing 1.25 gigabit-per-second (Gbps) upload and download speeds. Combined with the latest DOCSIS technology on a live production network using Network Function Virtualization (NFV).


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The core component of 10G, DOCSIS 4.0 is an evolutionary leap in the ability to deliver multigigabit upload and download speeds on connections already installed in millions of homes around the world.

Comcast has shown that it can get 4Gbps full duplex internet speed.

Above: Comcast has shown that it can achieve 4Gbps full duplex internet speeds.

Image Credit: Comcast

“The great strength of our smart network design is that we are able to meet the demands of our customers today, even as we continue to evolve to meet the needs of the future,” said Charlie Harin, President of Technology, Products and Experience at Comcast. Cable, in a statement. “As our 10G journey accelerates, customers will benefit from ever-increasing security, reliability and speed.”

10G technology, comcast has done in the last few years to create a smarter, more virtualized network to help handle loads during epidemics, while people rely more on remote technology than ever before.

In addition to paving the way for multigigabit uploads and download speeds on a scale, 10G updates will deliver near-term benefits to customers in the form of increased reliability, performance and less delays, the company said.

Connected by Broadcom 10G technology, the modem test used the DOCSIS 4.0 FDX SoC device, which Comcast demonstrated in April 2021, paired with two cable modem chips for performance.

These were successfully connected to a lab-based hybrid fiber-coaxial network with vCMTS operating in DOCSIS 4.0 mode. This represents the first complete network connection of all-DOCSIS 4.0 components required for deployment. As developers refine technology at every level of the 10G architecture – which was faster than 4 Gbps uploads and downloads – expect a specified speed.

Elad Nafshi, Senior Vice President, Comcast Cable, said in a statement: “With each new milestone, we get a clear picture of how 10G technologies will unlock the next generation of speed and performance for millions of people around the world.”

I asked Nafshi how this test is different from the previous test.
“The big news here is that we believe this is the world’s first test of a true 10G (DOCSIS 4.0) modem,” Nafshi told VentureBeat in an email. “In our previous milestones you’ve covered, we’ve seen major advances in 10G network technology (nodes, vCMTS), but this is the first time we’re testing an in-home device that will actually upload and distribute this multigigabit. Download speeds in the homes of millions of customers.

He added, “With this announcement we have now successfully tested all the key components that will be needed to support real world 10G deployments. With this step completed, we are now focused on tightening these technologies as we await a lively trial in this area. “


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