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Comcast Sizing Up Plan to Syndicate a Virtual CMTS – Sources

Jeff Baumgartner
5/22/2019
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Like it's already done with its X1 video platform, Comcast is exploring a syndication program for a virtualized form of a converged cable access platform (CCAP) or cable modem termination system (CMTS) that it could then sell and license to other cable operators, multiple industry sources tell Light Reading.

If Comcast ultimately decides to pursue that path, it could have significant competitive implications, as it would conceivably turn Comcast into a CCAP supplier and spawn a new, daunting rival in an already heated market that includes such vendors as Arris/CommScope, Cisco Systems, Casa Systems, Nokia and Vecima Networks.

That Comcast is developing a virtual CCAP is not a secret, as the operator has openly teamed with Harmonic on a project that involves Harmonic's CableOS virtual CCAP platform. That work stems from a warrant agreement, announced in the fall of 2016, that gives Comcast the option to acquire up to 7.81 million shares of Harmonic stock based on certain CableOS and other product sales and deployment milestones.

Under Harmonic's CableOS approach, the software takes care of the control, management and data plane and CMTS processing is handled by commercial-off-the-shelf (COTS) x86 servers. That product has been in production since late 2016, with Com Hem in Sweden and Ohio-based Buckeye Broadband two prime examples of early adopters. Harmonic, which aims to disrupt the CCAP market and topple the leaders with its software-powered platform, has 32 commercial deployments and field trials of CableOS underway, with more than 670,000 cable modems connected to its virtual platform. Harmonic has not announced if any of those modems reside on a Comcast network.

Sources say the vCCAP platform that Comcast is developing is a variant of CableOS that is being tailored for Comcast's network. They also say that Comcast essentially owns anything produced from the Harmonic partnership.

It's not yet known if that work will align perfectly with the CableLabs DOCSIS product interoperability specs or fork off to become a separate, quasi-standard for Comcast's networks. Notably, CableLabs recently retooled its network virtualization and software-defined networking efforts following the departure of two key execs involved in that work. CableLabs had been exploring the development of a virtual CCAP/CMTS, but it's not clear if that work is still ongoing, as CableLabs typically focuses on interoperability specs and defining actual products is a bit outside its normal scope. Plus, such activity could be rendered moot as Comcast continues to develop its own vCCAP.

Comcast's network virtualization work extends into the operator's grander plans for a next-generation network, which include Full Duplex DOCSIS, a new CableLabs spec that will support symmetrical speeds of up to 10 Gbit/s, and the MSO's associated deployment of a "Node+0" distributed access architecture (DAA) that pushes fiber closer to the home while also eliminating the amplifiers between the node and the home.

A Comcast official acknowledged that the company is keenly interested in FDX, DAA, remote PHY and network virtualization and eventually deploying those technologies and capabilities on the operator's own networks. But the official stressed that any talk of a syndication strategy involving a virtual CMTS/CCAP is premature.

The Comcast official also emphasized that DAA deployments on the company's own networks are still in their early stages, as are testing and development of the virtualization of the access network. So it's too early to suggest that the operator would pursue a licensed form of a virtualized product for other MSOs.

However, multiple people familiar with Comcast's thinking in this area say the operator is exploring the idea of offering a vCCAP under a syndication model to other MSOs, once the product is more fully developed and deployed at scale on Comcast's own network.

"This isn't a new thing," an exec with a top cable technology supplier said of Comcast's ambitions to some day market a virtual CMTS on a syndicated basis. "Frankly, Comcast has been out actively talking to other MSOs about it for a while."

The same person stressed that Comcast is not close to pulling the trigger on that idea, as the operator will want to shake it out first internally and deploy it on its own networks before moving ahead on anything bigger.

"I don't think they're anywhere near it," the source said of those syndication desires. The source added that Comcast's early discussions about a licencing model have largely been focused on the operator's current X1 syndication customers, partly to get feedback and gather information about what kind of features and capabilities they'd want to go into such a product. Comcast's announced X1 syndication partners are Cox Communications and three Canadian service providers -- Rogers Communications, Shaw Communications and Videotron.

"They've still got a long way to go in maturing it from an operational perspective before they start [syndicating] that," the source added, noting that the video service aspects of the project are much more complicated than the broadband/data side of it.

Virtualization could result in real benefits for Comcast
While Comcast's pursuit of its own virtual CMTS has some potentially explosive implications for cable vendors, Comcast stands to realize some significant benefits from the successful deployment of a virtualized network.

For starters, Comcast would save money if it can pivot away from purpose-built CCAP hardware and toward a new software-based platform that can run on less expensive COTS servers. That, in turn, could enable Comcast to emphasize the use of data centers matched with virtualization and a new remote PHY architecture that puts key electronics toward the edges of the cable network. Put together, that shift theoretically would enable Comcast to significantly eliminate the real estate needed for traditional headends and secondary hubs, not to mention the costs required to power, cool and maintain those facilities.

But Comcast would also have to deploy an expensive enterprise-class Ethernet switch in its remote PHY solution, which, according to one source, could pop the costs back up to what a port in a traditional CMTS costs today.

"I think they've been learning the hard way that that's not as easy as they thought it would be," a source familiar with Comcast's virtualization effort said.

And it's not a platform that would be deployed overnight, as it will more likely be rolled out on a staggered, cap-and-grow basis, with greenfield builds being the most logical starting point. "It won't be a hard cut," the source said.

Jeff Heynen, research director for broadband access and home networking at Dell'Oro, said it's logical from a technology and operational standpoint for Comcast to, in a sense, go it alone with respect to network virtualization. Comcast, he said, might have no other option but to push ahead, as it's essentially on an "island" with respect to its current network trajectory compared to other MSOs around the world. Plus, he said, it would behoove Comcast to assume as much control as possible of the costs and to establish a predictable path for how it makes this critical transition.

Comcast's commitment to DAA and FDX dwarfs any being made by other cable operators. Comcast may also be moving at a speed that exceeds what it needs from standard- and specification-setting industry organizations that typically require feedback and buy-in from multiple cable operators before things can be agreed upon and pushed forward.

"For Comcast and the scale and type of network they want to pursue, it makes sense [for them] to have control over the software and the hardware and all of those aspects," Heynen said. "There's no question that Comcast is the most aggressive with Full Duplex DOCSIS and DAA -- no other operator is going down that path as aggressively. Comcast is the only one that has said we're on this path to Full Duplex."

He said it's too early to say if Comcast would find much success with a syndication strategy, though Heynen speculated three years ago that such a possibility could someday emerge in the wake of the original Comcast/Harmonic CableOS-focused warrant agreement.

"They [Comcast] certainly could license it, but I don't know what kind of reception they would receive from the larger cable operator community," Heynen said, noting that syndication is likely far down the list on Comcast's current priorities with respect to network virtualization.

Next page: Syndication viewed as a 'tall order'

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