Harmonic has launched SeaStar and Oyster MDU solutions designed to deliver multi-gigabit broadband by reusing existing in-building coax and fiber infrastructure. These solutions aim to accelerate revenue and reduce capital expenses for operators targeting multi-dwelling units (MDUs). The cOS broadband platform orchestrates these solutions, enabling seamless integration and management.
The launch addresses a critical bottleneck in the streaming supply chain: the high cost of the 'last hundred feet' in dense urban environments. By bypassing the need for unit-access permits and interior rewiring, Harmonic allows ISPs to activate multi-gigabit tiers months faster than traditional fiber-to-the-unit overbuilds. This accelerates the deployment of high-bandwidth infrastructure necessary for 8K streaming and low-latency cloud gaming in previously underserved brownfield buildings. In a saturating broadband market, capturing these high-density assets with lower CAPEX represents a strategic shift toward margin preservation. Watch for Comcast and Charter's adoption rates of these 'reuse-first' nodes as they compete with 5G fixed-wireless access in metropolitan corridors.
Harmonic's cOS broadband platform has established dominant market share in the virtualized cable access space that underpins the SeaStar and Oyster launches. Harmonic reported in February 2025 that its cOS platform powers over 33 million modems for nearly 130 operators worldwide, including 14 Tier-1 service providers, with 98% market share in virtual CMTS and 62% share of DAA node deployments globally according to Dell'Oro Group. The SeaStar and Oyster MDU nodes extend this same orchestration layer into brownfield multi-dwelling units, giving operators a unified management plane for both greenfield and brownfield in-building builds without adding a separate control system.
The competitive urgency for MDU-focused solutions is visible in operator deployment timelines. Harmonic and Mediacom Communications showcased a unified DOCSIS 4.0 production deployment on a live network at SCTE TechExpo25 in September 2025, delivering symmetric multi-gigabit speeds to real-world customers in Moline, Illinois using Harmonic's cOS platform with a PTP-less core and Unified Pebble-2 Remote PHY Devices in Ripple modular DAA nodes. That deployment demonstrated the platform's readiness for field-scale rollouts, and the SeaStar and Oyster nodes represent the next logical step: applying that same DOCSIS 4.0 and fiber capability to the densest and most expensive-to-wire building types where per-subscriber construction costs are highest.
On the technical architecture side, Harmonic's cOS platform was among the first to unify both DOCSIS 4.0 variants (Full Duplex and Extended Spectrum) alongside 10G PON in a single system. Harmonic announced in October 2023 that cOS achieved live production delivery of multigigabit symmetric speeds leveraging DOCSIS 4.0 and 10G PON technology, consolidating management of cable and fiber network assets into one platform. This unified approach is directly relevant to the MDU use case because SeaStar reuses existing coax while Oyster targets fiber-to-the-distribution-point, and operators need a single orchestration layer to manage both paths without provisioning separate systems for each building type.
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