Latency

CableLabs Certifies First Cable Modem with Low Latency DOCSIS® Support

Matt Schmitt
Principal Architect

Apr 1, 2021

CableLabs is pleased to announce that, for the first time, a DOCSIS® 3.1 specification–compliant cable modem that includes the Low Latency DOCSIS (LLD) set of features has become CableLabs Certified. This announcement represents a major milestone on the path toward 10G because LLD support is key to improving latency on DOCSIS networks, and improving latency is one of the pillars of 10G.

Starting with Certification Wave (CW) 134 in January, all DOCSIS 3.1 cable modems submitted for CableLabs certification are required to include support for the LLD feature set. Our Kyrio subsidiary recently finished testing the Motorola MG8725 from Minim, which was submitted for testing in that CW. The CableLabs Certification Board—made up of representatives from our member companies—then reviewed the results and determined that the device had met the requirements for CableLabs Certification.

The modem can be found on the Certified/Qualified Device List on the CableLabs website with an ID of MOTO1341. Any DOCSIS 3.1 cable modems added to that list in the future for CW 134 or later will also include support for the LLD feature set.

What Is Latency?

As described in our "Latency 101: Getting From There to Here" blog, latency refers to the time it takes for something to get from one point to another across a network. People experience this delay when doing things on the Internet, and it can come from myriad sources. Although latency performance often does not receive the same attention as speed, it’s one of the most noticeable aspects of a user’s online experience.

What Is Low Latency DOCSIS?

As described in our blog post “CableLabs Low Latency DOCSIS Technology Launches 10G Broadband into a New Era of Rapid Communication,” LLD technology is a set of new features for DOCSIS 3.1 (and future) equipment that can be added to already deployed devices via a software update. LLD can provide consistent low latency (as low as 1 millisecond) on the access network for the applications that need it. The user experience will be more consistent with much smaller delay variation.

Why Is Low Latency DOCSIS Important?

In our blog post “Rise of Cloud Gaming—Meeting the Challenges for ISPs,” we discussed applications such as online gaming and game streaming that can provide greatly improved user experiences with reduced, consistent latency. But latency isn’t just about gaming: Many work-from-home applications such as video conferencing can benefit from improved latency. And future technologies like interactive virtual experiences will require consistently low latencies as well.

What Is CableLabs Certification, and Why Does It Matter?

As detailed in our blog post “What’s in a Name? The Value of Certification/Qualification for Cable Operators,” in order for a device to become CableLabs Certified, Kyrio executes a series of tests to determine whether the device complies with a particular CableLabs specification. Once that testing is completed, the results are reviewed by the Certification Board to determine whether that device has earned CableLabs Certification status.

CableLabs Certification, therefore, serves as a mark of quality, indicating that a given device complies with the requirements of our specifications and enabling cable operators to roll out the device. CableLabs and Kyrio offer a number of options to assist vendors through the certification process—as detailed in our blog post “3 Tips on How to Make CableLabs Certification/Qualification Testing as Painless as Possible”—including interoperability events and device pre-testing.

A cable modem with LLD functionality that successfully completes CableLabs Certification represents a big step on the path to eventual wide deployment of these technologies, enabling a host of new applications and improved user experiences. We can’t wait to see the new ideas that will generate.

LEARN MORE ABOUT LOW LATENCY DOCSIS