Upgrading MSO Networks to Fiber to the Home (FTTH): A Technical Perspective
Upgrading MSO Networks to Fiber to the Home (FTTH): A Technical Perspective, published by the Fiber Broadband Association’s (FBA) Technology Committee in May 2026, provides cable television Multiple System Operators (MSOs) with a structured technical and economic framework for transitioning from Hybrid Fiber-Coaxial (HFC) networks — which have underpinned cable broadband for decades using DOCSIS (Data Over Cable Service Interface Specification) standards — to full Fiber-to-the-Home (FTTH) architecture. The whitepaper is grounded in an urgent competitive reality: MSO broadband subscriber net losses began in 2023 and have accelerated through 2025 and 2026, driven primarily by competition from FTTH service providers offering symmetrical gigabit and multi-gigabit services that HFC networks are structurally constrained from matching on symmetry, latency, and long-term capacity.
The FBA identifies six primary drivers pushing MSOs toward FTTH migration. Bandwidth demand continues to grow, fueled by cloud services, video conferencing, AI applications, online gaming, and connected device proliferation, and FTTH networks offer virtually unlimited bandwidth potential. FTTH providers offering symmetrical gigabit services put HFC at a structural disadvantage, particularly for upload-intensive users. On the economics side, FTTH operating expenditure (OpEx) has been estimated at approximately 50% lower than HFC, driven by less active field equipment, lower power consumption, and reduced maintenance requirements. The subscriber economics also favor FTTH: average revenue per user (ARPU) for FTTH subscribers is $73–$74 versus $70.50 for HFC subscribers, and where fiber is available, 36% of net two-year churn migrates to fiber compared to 23% for HFC.
Three FTTH deployment models are available to MSOs. A Greenfield FTTH Overbuild deploys a completely new FTTH network in parallel with the existing HFC network, enabling FTTH service in select areas without disrupting existing subscribers — but requiring significant upfront capital. Selective Fiber Deepening and Replacement gradually extends fiber closer to the customer while selectively replacing coaxial segments, using intermediate architectures such as Remote PHY (R-PHY) and Remote MAC-PHY (R-MACPHY) to push active equipment closer to the customer and reduce the length of the remaining coaxial segment; the Gap Node further enables geographic segmentation of the coax-to-fiber transition. Full Fiber Overbuild completely replaces the HFC network with FTTH infrastructure — the most capital-intensive approach but the cleanest path to a future-proof network.
For Passive Optical Network (PON) technology selection, XGS-PON is currently the most widely deployed standard, offering symmetrical 10 Gbps capacity with approximately 8.3 Gbps real-world throughput, and is well-suited for multi-gigabit residential services. 25G-PON is emerging as a competitive differentiator with approximately 21.5 Gbps real-world throughput. 50G-PON is designed for coexistence with both XGS-PON and 25G-PON on the same fiber infrastructure. 100G-PON was first launched in 2023 and is currently in trials. Looking further ahead, fiber’s theoretical capacity on a single full-spectrum optical fiber reaches 600,000 Gbps — with laboratory demonstrations already achieving 400,000 Gbps — and fiber optic cable carries an expected 50–100-year service life. Future bandwidth upgrades require only endpoint electronics changes, not physical infrastructure replacement.
During the HFC-to-FTTH transition, coexistence strategies including Physical Separation, Wavelength Division Multiplexing (WDM) — which carries both legacy HFC signals and PON signals on different wavelengths over shared fiber — and Overlay Networks allow MSOs to manage phased migrations while minimizing customer disruption. Operational requirements include workforce training in fiber splicing and Optical Time Domain Reflectometer (OTDR) testing, integration of Operations Support Systems (OSS) and Business Support Systems (BSS) with FTTH service provisioning, and deployment of Optical Network Units (ONUs) at customer premises to replace coaxial cable modems.
MCTV, a Massillon, Ohio-based MSO serving more than 57,000 homes and businesses across Ohio and West Virginia, provides the whitepaper’s real-world case study. MCTV President Katherine Gessner reports that more than 70% of MCTV subscribers are now on fiber through its Excellerate Fiber service, which is available to more than 80% of homes passed. MCTV’s fiber journey began in 2016–2017, when the operator determined that the cost of FTTH and DOCSIS 3.1 upgrades was comparable — and chose fiber for its reduced need for future system rebuilds and lower long-term maintenance costs. Since the beginning of 2025, MCTV has decommissioned 250 HFC power supplies — approximately two-thirds of its total — by targeting specific neighborhoods for sequential conversion and setting firm deadlines for HFC plant shutdown.
Whitepaper FAQ’s
1. Why are MSOs losing broadband subscribers and why is FTTH the solution? Cable television Multiple System Operators (MSOs) began experiencing broadband subscriber net losses in 2023, with losses accelerating through 2025 and 2026. The primary driver is competition from Fiber-to-the-Home (FTTH) service providers offering symmetrical gigabit and multi-gigabit services. Hybrid Fiber-Coaxial (HFC) networks face structural limitations in symmetrical bandwidth, latency, and long-term capacity that DOCSIS upgrades can partially address but not fully overcome. The FBA concludes that MSOs must migrate to FTTH to retain and grow subscribers in markets where fiber is available or entering.
2. What is the difference between HFC and FTTH networks? Hybrid Fiber-Coaxial (HFC) networks combine optical fiber from the cable headend to neighborhood nodes with coaxial cable for the final connection to the home. DOCSIS (Data Over Cable Service Interface Specification) standards have enabled significant bandwidth increases over HFC, but the shared coaxial medium introduces inherent constraints on symmetrical bandwidth, latency consistency, and long-term capacity headroom. Fiber-to-the-Home (FTTH) replaces the coaxial last-mile segment entirely with optical fiber, eliminating the shared medium and delivering dedicated, symmetrical, low-latency connections with virtually unlimited upgrade capacity.
3. What is the business case for MSOs to upgrade to FTTH? The FBA identifies several compelling economic drivers. FTTH operating expenditure (OpEx) is approximately 50% lower than HFC due to reduced active field equipment, lower power consumption, and decreased maintenance requirements. ARPU for FTTH subscribers is $73–$74 versus $70.50 for HFC subscribers. Where fiber is available, 36% of net two-year churn migrates to fiber compared to 23% for HFC. These figures, combined with the competitive necessity of matching FTTH providers’ symmetrical gigabit offerings, make the business case for migration both strategic and financial.
4. What are the three FTTH deployment models available to MSOs? The FBA outlines three primary deployment models. Greenfield FTTH Overbuild deploys a new FTTH network in parallel with the existing HFC network, enabling FTTH service in select areas without disrupting current subscribers — but requiring significant upfront capital investment. Selective Fiber Deepening and Replacement gradually extends fiber closer to the customer using intermediate architectures such as Remote PHY (R-PHY) and Remote MAC-PHY (R-MACPHY), with the Gap Node enabling geographic segmentation of the transition. Full Fiber Overbuild completely replaces the existing HFC network with FTTH infrastructure — the most capital-intensive approach but the cleanest path to a future-proof network.
5. What PON technology should MSOs choose for FTTH deployment? Passive Optical Network (PON) systems are the predominant technology for MSO FTTH deployments. XGS-PON is currently the most widely deployed standard, offering symmetrical 10 Gbps capacity with approximately 8.3 Gbps real-world throughput — well-suited for gigabit and multi-gigabit residential services. 25G-PON is an emerging option with approximately 21.5 Gbps real-world throughput, being adopted by some MSOs to regain performance dominance in competitive markets. 50G-PON is designed for coexistence with XGS-PON and 25G-PON on the same fiber infrastructure. 100G-PON was first launched in 2023 and is currently in trials. XGS-PON is increasingly the strategic choice for MSOs targeting competitive multi-gigabit symmetrical services.
6. How future-proof is fiber optic infrastructure? A single full-spectrum optical fiber has a theoretical transmission capacity of 600,000 Gbps, with laboratory demonstrations already reaching 400,000 Gbps. Systems delivering 200 Gbps and 400 Gbps are under active development. Fiber optic cable carries an expected 50–100-year service life. Critically, future bandwidth upgrades require only endpoint electronics changes — not physical infrastructure replacement — meaning the fiber installed today can support technologies not yet conceived simply by upgrading the Optical Line Terminals (OLTs) and Optical Network Units (ONUs) at each end.
7. What are the coexistence strategies for MSOs running HFC and FTTH networks simultaneously? Three coexistence strategies are available during the transition period. Physical Separation deploys separate fiber infrastructure for FTTH alongside the existing coaxial network — straightforward but capital-intensive. Wavelength Division Multiplexing (WDM) carries both legacy HFC signals and PON signals on different wavelengths over shared fiber infrastructure, enabling reuse of existing fiber assets with careful wavelength planning and filtering. Overlay Networks build a new FTTH network that gradually takes over subscribers from the HFC network, enabling phased migration with minimal service disruption.
8. What operational changes does an FTTH upgrade require from MSOs? FTTH upgrades require workforce training in fiber splicing, testing, and troubleshooting using Optical Time Domain Reflectometers (OTDRs) and related tools — all mature, commercially available products with 25+ years of industry development behind them. Operations Support Systems (OSS) and Business Support Systems (BSS) must be adapted or replaced for FTTH service provisioning. Optical Network Units (ONUs) must be deployed and managed at customer premises to replace coaxial cable modems. Existing coaxial service drops must be overbuilt with new fiber drops. The FBA notes that most MSOs already have substantial fiber construction expertise from building the fiber portion of their existing HFC networks.
9. What does the MCTV case study show about real-world FTTH conversion? MCTV, a Massillon, Ohio-based MSO serving more than 57,000 homes and businesses across Ohio and West Virginia, began its fiber transition in 2016–2017 after determining that FTTH and DOCSIS 3.1 upgrade costs were comparable — and choosing fiber for its lower long-term maintenance burden and reduced need for future system rebuilds. MCTV’s Excellerate Fiber service is now available to more than 80% of homes passed, with more than 70% of subscribers on fiber. President Katherine Gessner reports that fiber customers experience significantly better outcomes during weather events, allowing crews to focus on downed lines rather than generator management. Since early 2025, MCTV has decommissioned 250 HFC power supplies — roughly two-thirds of its total — by targeting specific neighborhoods sequentially and setting firm HFC plant shutdown deadlines.
10. What is Remote PHY and how does it fit into an MSO’s FTTH migration strategy? Remote PHY (R-PHY) is a fiber deepening architecture that pushes the physical layer (PHY) processing function from the cable headend out to a Remote PHY Device (RPD) located at or near the fiber node, closer to the customer. Remote MAC-PHY (R-MACPHY) goes further, also moving the Media Access Control (MAC) layer processing to the remote device. Both architectures extend fiber deeper into the network, reduce the length of the remaining coaxial segment, and can serve as intermediate steps toward full FTTH by leveraging existing fiber assets while improving performance. They are distinct from FTTH but compatible with a phased migration strategy.
11. How does FTTH affect MSO operational costs long-term? FTTH operating expenditure (OpEx) has been estimated at approximately 50% lower than HFC. The primary savings drivers are reduced active equipment in the field — FTTH’s passive optical architecture eliminates the amplifiers, nodes, and power supplies that HFC requires throughout the outside plant — along with lower power consumption and reduced maintenance requirements. MCTV’s experience illustrates this directly: the operator specifically cited reductions in electricity and maintenance costs for power supplies as measurable early benefits, and employees noted qualitatively better outcomes during weather events with fiber compared to HFC.
12. What is the ARPU and churn advantage of FTTH over HFC for MSOs? ARPU for FTTH subscribers is $73–$74 compared to $70.50 for HFC subscribers. On subscriber retention, where fiber is available in a market, 36% of net two-year churn migrates to fiber, while HFC loses 23% over the same period. These figures underscore a compounding competitive dynamic: MSOs that delay FTTH migration not only face higher operational costs but also structurally lower revenue per subscriber and accelerating churn in markets where fiber is being deployed by competitors.