Cable MSOs Leverage DOCSIS 3.1 and NFV for Performance-Assured Business Services

Posted by Jeff Johnson on Tuesday, October 03, 2017 with No comments

With the advent of DOCSIS 3.1 deployments starting to accelerate in the U.S. cable MSO market, the significance it brings to operators like Comcast and Cox—making it possible for them to deliver gigabit broadband using existing HFC infrastructures—is enormous. MSOs are leveraging the technology as a means of expanding up-market to deliver sophisticated business services to enterprises as well as enhancing their residential services.

DOCSIS 3.1 is “cheaper to deploy than all-fiber networks because it makes use of legacy infrastructure, and the technology vastly expands cable broadband capacity, making it easier to introduce new gigabit-speed services,” explained Light Reading Senior Editor Mari Silbey in an article outlining the effects of the technology over the past few years.

Further, a lot of what’s possible with DOCSIS 3.1 (more capacity and speed, expanded capabilities for managing bandwidth and delivering higher-bandwidth services) feeds into the virtualization trend that has come to the forefront of the MSOs’ technical arsenal. This ties directly into the need for sophisticated performance assurance required to meet commercial service level agreements (SLAs) and retain residential customers.

DOCSIS 3.1 and Service Assurance

To compete with telcos in the premium business services market requires MSOs to establish a reliable means of SLA-grade performance assurance. Further, DOCSIS 3.1-based GbE services need to be on par with fiber-based offerings as most businesses are more concerned about reliability and performance than pure bandwidth. Connectivity to the cloud, for software as-a-service (SaaS) applications, is operationally crucial for enterprises.

Committing to guaranteed uptime, bandwidth availability, and rapid mean time to repair (MTTR) are therefore prerequisites for MSO success in the enterprise market.

The conundrum facing MSOs is that current DOCSIS modems don’t offer integrated performance monitoring, service turn-up testing, operations and maintenance (OAM) demarcation, and other key features needed for business services delivery. These capabilities must somehow be added, in a way that has minimal impact to the cost of deploying such services.

Accedian has been extremely successful in working with the MSO market to use network functions virtualization (NFV) for delivery of network interface device functionality in a small, programmable device—enabling end-to-end OAM visibility, hardware-based demarcation, performance monitoring, troubleshooting, and service turn-up. This type of virtualized instrumentation simplifies and assures the full business services over DOCSIS service delivery lifecycle.

How Accedian Can Help
Accedian’s ant module—a small form factor, FPGA-based device that works directly with network elements to provide advanced performance assurance capabilities, centrally managed using the Accedian SkyLIGHT VCX controller software—fills the gap for MSOs looking to expand their service assurance and delivery capabilities. In addition to standard cable modem/ant module deployments, MSOs are now embracing what can be done by installing a virtualized version (software only) of the ant module onto a universal customer premises equipment (uCPE) x86 box, or by partnering with manufacturers to include the ant module functionality in their cable modems.

The latter option is finally possible because of the potential inclusion of Accedian’s agent in cable modem DOCSIS 3.1 silicon, rather than requiring the addition of ancillary hardware daughterboard(s) or SFP port(s). With the “room” now available in the DOCSIS 3.1 silicon, cable MSOs are encouraging modem manufacturers to revisit the inclusion of an Accedian agent in their hardware.

This opens up a large set of new opportunities in the commercial—and conceivably also residential—cable market. Further, embedding the Accedian agent into the cable modem and/or uCPE dovetails directly into the MSO trend toward adopting SD-WAN for business services delivery.

Beyond performance monitoring metrics like delay, delay variation, and packet loss, the latest generation of ant modules (and the ant agent) introduces advanced assurance capabilities like granular bandwidth utilization metering, remote packet capture, and generation of standards-based testing (e.g. RFC2544 SAT, Y.1731 performance monitoring) between sites/branch locations. These capabilities deliver tremendous OPEX savings for MSOs, as well as the ability to differentiate their products and upsell additional services.