Comcast to roll out DOCSIS 4.0 and Multi-Gig speeds in 2023; Fiber (not FWA) is the real competitor

Comcast is on a path to deliver 10Gbps connectivity.  Speaking at a Bank of America investor conference on September 8th, Comcast EVP and Deputy CFO and Treasurer Jason Armstrong said the cable network operator will be in the market with DOCSIS 4.0 and offering symmetrical multi-gig broadband in the second half of 2023.  Currently, upload speeds top out at 200 Mbps.

Armstrong said:  “Comcast fiber connectivity has gone from 0% to 40% sort of across our footprint in a fairly linear fashion. And in that time frame, we’ve become America’s number one broadband provider, 32 million subs. I would tell you in the last couple of years through the pandemic, we added three million subscribers in an environment where fiber was actually picking up in terms of the presence in the markets that served against us….Fixed wireless access (FWA) is newer, but longer term, fiber is the real long-term competitor. And it always has been. Our view hasn’t changed. It’s a very viable competitor.”

“And longer term, if you think about it, any secular trend out there, whether it’s AR, VR, Metaverse, low latency gaming, the move from linear to streaming, every one of those is — those are bandwidth talks. That’s going to continue to move up usage profiles across the network. Those are all trends that work in our favor.”

Comcast said rollouts of its 2-gig offering are underway in Colorado Springs, Colorado; Augusta, Georgia; and Panama City Beach, Florida. It added the service will be available in a total of 34 markets by the end of 2022 and to more than 50 million locations across the country by the end of 2025.  Comcast already offers speeds of up to 1.2 Gbps across its entire cable network using DOCSIS 3.1 technology and has been rolling out mid-split upgrades over the past several months in preparation for an update to DOCSIS 4.0. Speeds of up to 6 Gbps are already available to certain Xfinity fiber customers.

Elad Nafshi, EVP and Chief Network Officer at Comcast Cable, told Fierce Telecom the faster speeds will be available on any DOCSIS 3.1 modem, meaning no upgrades will be required. Elad noted the company’s recent launch of a Wi-Fi 6E router which will deliver the best user experience.  According to Nafshi, the mid-split upgrades are just one small piece of the work it has put into enabling the new speed tier. He pointed to its deployment of a virtual cable modem termination system (vCMTS) as well as digital nodes and digital optics as critical pieces of the puzzle which also lay the groundwork for its future DOCSIS 4.0 rollout.

“The way we’re delivering the increased upstream speeds is by, for the very first time, launching DOCSIS 3.1 in the upstream. It’s by relying on the Octave platform that enables us to truly optimize the delivery of those greater upstream speeds by leveraging those new upstream frequencies in order to deliver on this product. Extending additional DOCSIS 3.1 channels, which enable us to deliver the 2-gig speeds as well. There’s a lot of firsts coming to market here,” he explained.



One thought on “Comcast to roll out DOCSIS 4.0 and Multi-Gig speeds in 2023; Fiber (not FWA) is the real competitor

  1. Jeff Baumgartner of Light Reading:

    Comcast is using a virtualized cable modem termination (vCMTS) and a distributed access architecture (DAA) to underpin a wave of multi-gigabit downstream speeds and enhanced upstream speeds in dozens of markets before the end of 2022. That work will serve as a springboard for the deployment of a more advanced DOCSIS 4.0 network that will start to deliver symmetrical multi-gigabit services in late 2023.

    In concert with Wednesday’s launch of 2-Gig downstream speeds and faster upstream speeds in Denver, Comcast showed off some of its handiwork with city leaders and some media here at a headend that houses some of the new technologies that are making its new network go.

    Currently based on DOCSIS 3.1, the access network that is delivering those new capabilities features a vCMTS paired with a distributed access architecture (DAA) powered by fiber nodes outfitted with remote PHY devices (RPDs). That will place PHY layer functions of traditional CMTS at the edge of the network and boost capacity by digitizing the HFC network all the way to the node.

    Comcast is also boosting the DOCSIS upstream with a “mid-split” upgrade that expands the amount of spectrum dedicated to the upstream – from a legacy range of 5MHz-42MHz to a wider range of 5MHz-85MHz.

    This week’s launch in Denver tied into Comcast’s plans to launch 2-Gig downstream speeds along with 5x to 10x faster upstream speeds (up to 200 Mbit/s) to 34 cities and towns before the end of the year. Similar upgrades are underway in markets such as Colorado Springs; Baltimore; Philadelphia; Hartford, Connecticut; Augusta, Georgia; Panama City Beach, Florida; Salt Lake City, Utah; and Washington, D.C.

    “Our network upgrade is in full swing,” Elad Nafshi, Comcast’s EVP and chief network officer, said here during a briefing.

    Comcast initially is limiting access to the new, faster upload speeds to customers who take xFi Complete, a package that sells for an additional $25 per month that includes Comcast’s gateway, its advanced cyber security product, Wi-Fi controls and unlimited data.

    DOCSIS 4.0 update

    Those 2022 market upgrades are setting the stage for a move to DOCSIS 4.0 and the introduction of symmetrical multi-gigabit speeds. Comcast plans to introduce that capability in select markets in the second half of 2023 and to bring them to more than 50 million homes and businesses before the end of 2025.

    Comcast announced earlier this week that it had completed its first “live” DOCSIS 4.0 trial in the Philadelphia area. It marked the first time Comcast delivered a DOCSIS 4.0-based service to a subscriber location, Nafshi said.

    The trial connection, which delivered symmetrical speeds of 4 Gbit/s, ran off of Comcast’s vCMTS outfitted with DOCSIS 4.0 code in tandem with DOCSIS 4.0-based remote PHY devices and modems, he said.

    The Philadelphia trial used a “node+0” architecture, whereby fiber is pulled deep enough so there are no amplifiers required between the premises and the node. Comcast is also developing an FDX Amplifier that will enable the operator to deploy DOCSIS 4.0 to the vast majority of its HFC network, including portions of the plant that have multiple amplifiers (up to six, and potentially more) present between the home and the node.

    Nafshi said the FDX Amplifier is still in development, but “there’s lots more to come on that in 2023.” CommScope, a key vendor partner on that project, showed a prototype FDX Amplifier in October at the SCTE Cable-Tec Expo in Philadelphia.

    As Comcast looks ahead to D4.0/FDX deployments in 2023, Nafshi confirmed to Light Reading that the operator will base it on HFC networks built to 1GHz (the FDX specs support bandwidth up to 1.2GHz).

    Nafshi said Comcast doesn’t feel the need to upgrade capacity to 1.2GHz at this point. “Everything can fit under the 1-Gig umbrella,” he said. However, he points out that taps being deployed today are capable of supporting 1.2GHz.

    Comcast, he added, will be able to generate the speeds delivered at its D4.0 demo at CableLabs in April (8.5 Gbit/s downstream and 5 Gbit/s upstream) with the 1GHz configuration, and “roll this out broadly.”


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