DOCSIS 3.1 is the latest standard for cable broadband. (Image courtesy: Diparth Patel)

DOCSIS 3.1 — the newest iteration of the standard that allows cable operators to deliver broadband over their hybrid fiber-coax networks — is performing better than expected, according to engineers at some of the largest cable companies in the country.

Multichannel News reports the new robust standard works “really well” even when cable infrastructure isn’t up to pristine standards.

“It [DOCSIS 3.1] works better than 3.0 in noisy plant,” said JR Walden, senior vice president of technology and chief technology officer of Mediacom. Walden adds it even performs well where cable operators oversell their network, packing too many customers on a congested node that would normally cause speeds to fall dramatically under the current DOCSIS 3.0 standard.

DOCSIS 3.1 is more efficient handling bandwidth available for broadband service and its ability to bond multiple channels together allows cable operators to boost internet speed tiers dramatically. Mediacom is currently deploying gigabit speeds across its entire network footprint, and the technology is backwards-compatible with DOCSIS 3.0 so cable networks can be upgraded without any disruption to customers.

Mediacom expects its costs to provision customers with broadband service across all speed tiers to drop because of DOCSIS 3.1, delivering the company “better economics.” Customer upgrades can also deliver additional revenue, and Walden claimed between 3-10% of Mediacom customers have already upgraded to gigabit speeds.

The Comcast XB6, one of the first DOCSIS 3.1 network gateways.

The biggest challenge found by early adopters of DOCSIS 3.1 isn’t the technology — it is the network gateways that connect cable modem service to in-home wired and wireless networks. DOCSIS 3.1-compatible gateways are still in short supply, and is essential if the customer is going to get the broadband speed they are paying for. The biggest bottleneck of all comes from in-home Wi-Fi.

Multichannel News:

“Having a very powerful WiFi device is critical” for DOCSIS 3.1, agreed Damian Poltz, VP of technology strategy and networks at Shaw Communications.

Comcast is trying to address this with the XB6, a full-featured DOCSIS 3.1 gateway that will also integrate speedy WiFi, ZigBee and other connectivity technologies.

For its initial D3.1 deployments, Comcast has been pairing stand-alone modems with a separate gateway to serve “thousands of customers.”

While acknowledging that such a set-up is not ideal, Jorge Salinger, VP of access architecture at Comcast, confirmed that Comcast is building versions of the XB6 that use Broadcom and Intel chipsets. He said Comcast is completing employee trials shifting toward customer trials and on to commercial deployments, which are expected to begin in the next month or so.

Customers without DOCSIS 3.1-compatible equipment will find speed tests reporting slower speeds than advertised. Several vendors are working on expanding the supply of network gateways and are making sure those devices can deliver robust Wi-Fi.

The cable companies most aggressive about DOCSIS 3.1 deployment have been Comcast and a variety of smaller national and regional operators like MidCo and Mediacom. Altice is upgrading Suddenlink customers to gigabit speeds using the current DOCSIS 3.0 standard and is scrapping its existing coax network for Cablevision customers, to be replaced with fiber-to-the-home service. Lagging behind will be Charter Communications, expected to be among the last cable operators to upgrade to DOCSIS 3.1 as it remains preoccupied with integrating Time Warner Cable and Bright House into its existing operations. Charter’s first priority is to complete all-digital upgrades for TWC and BH customers, expected to take up to two years to complete.