Cable MSOs transition to virtualized platforms as legacy equipment reaches obsolescence
This blog post from Harmonic discusses the challenges faced by cable MSOs due to legacy HFC networks and increasing competition, advocating for network modernization through virtualization and Distributed Access Architecture (DAA). It highlights risks from equipment obsolescence and supply chain issues, and promotes the use of Harmonic's cOS Broadband Platform and DAA devices as solutions to achieve 10G speeds and operational efficiencies for cable operators.
Key Takeaways
- Cisco has issued end-of-life notices for the GS7000 optical node, signaling a broader market shift away from integrated CMTS hardware.
- Harmonic’s Pebble edge module operates as a field-upgrade kit to transform legacy Cisco nodes into DAA-capable devices without housing replacement.
- Virtualization on commercial off-the-shelf hardware can yield up to 40% improvement in power costs and a 20-to-1 reduction in rack space.
- MSOs are losing broadband growth share to telcos, with ACG Research reporting telco growth rates consistently outpaced cable from late 2020 through early 2022.
Why It Matters
The migration from hardware-centric headends to cloud-native virtualization is no longer a luxury but a defensive necessity against fiber overbuilders. By decoupling the MAC and PHY layers through DAA, operators can incrementally scale capacity to 10G without the capital-intensive cost of a full fiber-to-the-home overbuild. For the streaming ecosystem, this infrastructure shift ensures the bandwidth headroom required for emerging symmetric multi-gigabit services and low-latency delivery across existing coaxial footprints. Watch for more MSOs to adopt 'unified' DOCSIS 4.0 chipsets that support both Full Duplex and Extended Spectrum architectures to maximize deployment flexibility.
Additional Context
The transition to virtualized CMTS (vCMTS) is reaching a critical inflection point in 2026. Per Fierce Network in January 2026, industry analysts predict this will be the first year of large-scale cable upgrades to DAA and DOCSIS 4.0 as operators move beyond limited lab trials. Dell’Oro Group has noted that while the broader cable gear market faced a recent slump, purchasing is expected to rebound specifically within vCMTS platforms to support multi-gigabit service tiers. These upgrades are vital as telcos aggressively expand fiber-to-the-home, which Nokia reporting in February 2026 can offer 80% to 90% power savings compared to active HFC electronics. Major North American MSOs are already executing these strategies to combat subscriber churn. Per Light Reading in March 2026, Comcast has extended its DOCSIS 4.0 footprint to millions of homes, utilizing Harmonic’s cOS platform to simplify operations and integrate fiber-based services where necessary. Similarly, Mediacom became the first operator to launch a 'Unified' DOCSIS 4.0 architecture in Illinois in September 2025, demonstrating that legacy plant can be modernized for symmetric speeds. This approach allows MSOs to keep upgrade costs between $100 and $200 per home passed, significantly lower than the thousand-dollar range typical for new fiber builds. Looking beyond 10G, CableLabs and its members are already researching the 'Operational Annex' for DOCSIS 4.0 to extend spectrum to 3GHz. Per industry updates in March 2026, this roadmap targets speeds of 25 Gbps and eventually 50 Gbps, ensuring HFC remains competitive with PON technologies. At the same time, the focus has shifted from raw speed to reliability; Vecima reported in early 2026 that high-volume telemetry and AI-driven network operations are becoming the primary differentiators for maintaining quality of experience in increasingly congested neighborhood nodes.
Read full article at harmonicinc.com