Introduction: The Decade-Long Head Start
For most European telecommunications providers, the race to deploy fiber-to-the-home (FTTH) is a contemporary obsession. However, for the Hannover-based regional operator htp, the "fiber era" began over a decade ago. While much of the industry is currently grappling with the logistical and financial hurdles of initial fiber rollouts, htp is already moving into its second strategic cycle.
At the recent BREKO Arbeitstag, Jochen Krauss, head of network planning at htp, joined Udo Abt, senior consultant of sales engineering at Calix, to demystify the transition from legacy fiber architectures to future-proof, high-capacity systems. Their discussion served as a blueprint for operators globally: how to modernize an early-stage network without disrupting service, ballooning costs, or compromising on quality.
The Evolution of a Network: Chronology and Context
The First Wave: Point-to-Point Ethernet
More than ten years ago, when the concept of gigabit connectivity was still nascent, htp made the strategic decision to invest heavily in point-to-point (P2P) Ethernet architecture. At the time, this was the gold standard for reliability and dedicated bandwidth. It allowed htp to capture a significant market share, eventually growing to serve over 123,400 residential and 9,710 business customers.
Today, 63% of htp’s connections are active FTTH lines—a penetration rate that remains the envy of many German and European competitors. However, as demand for symmetrical gigabit speeds and high-density connectivity soared, the limitations of the P2P architecture began to surface in terms of space, power consumption, and operational complexity.
The Second Wave: The Pivot to Native XGS-PON
Recognizing that the next decade would require higher efficiency and increased scalability, htp initiated a structured transition. The company chose to move away from its legacy P2P foundation in favor of native XGS-PON (10-Gigabit Symmetrical Passive Optical Network). This transition is not a "rip-and-replace" emergency but a deliberate, multi-year evolution aligned with the lifecycle of existing hardware. All new network densification and greenfield projects are now being deployed exclusively on the XGS-PON standard.
Supporting Data: The Economics of Efficiency
Total Cost of Ownership (TCO) Analysis
Before committing to the transition, htp conducted an exhaustive TCO analysis. The goal was to compare the operational burden of their legacy P2P network against the potential of XGS-PON. The findings were stark: the model projected a cost reduction of over 40%. According to Krauss, the real-world savings observed since implementation have even exceeded those initial projections.
Structural Drivers of Savings
The efficiency gains are rooted in fundamental architectural differences:
- Space Optimization: Serving 2,000 subscribers on a traditional point-to-point setup requires approximately 32 rack units of equipment in the central office. By contrast, the XGS-PON configuration achieves the same capacity using roughly one rack unit.
- Passive Field Networks: By utilizing distributed splitters, htp has been able to eliminate the need for many powered and climate-controlled street cabinets. The field network now operates almost entirely passively, drastically reducing electricity consumption and maintenance overhead.
- Operational Velocity: The shift to PON has simplified the service activation process. Technicians no longer need to be present at both ends of the line to provision services, allowing for faster, more efficient customer onboarding.
Engineering the Future: Why Native XGS-PON?
The decision to adopt native XGS-PON was the result of a rigorous debate between htp’s internal engineers and Calix’s technical team. While the industry explored various "Combo-PON" and GPON alternatives, htp opted for a pure XGS-PON path.
Technical Superiority
The XGS-PON architecture provides 10 Gbps of symmetric capacity, allowing for a 1:64 split ratio without any degradation in subscriber quality. This provides massive headroom for current high-bandwidth applications while ensuring that the infrastructure remains viable as requirements evolve.
Furthermore, the price of Optical Network Terminals (ONTs) for XGS-PON dropped significantly faster than industry analysts predicted, effectively erasing the historical cost premium over standard GPON. This shift in market dynamics turned a potential cost hurdle into a strategic advantage.
Future-Proofing
The choice of XGS-PON also clears the path for future upgrades, such as 50G PON. Because the underlying fiber infrastructure is designed for this evolution, htp can layer future capacity upgrades in parallel when backhaul and business service demands dictate, without requiring a complete overhaul of the optical distribution network.
Simplicity as a Corporate Strategy
For an operator of 250 employees, complexity is the enemy of growth. htp’s decision to partner with Calix was largely driven by the need for operational simplicity.
The Calix One Platform
The implementation of the Calix One platform allowed htp to abstract the underlying access technology. For the network team, this means configuring PON services using the same familiar terminology they used for Ethernet. The learning curve was remarkably flat; the engineer who introduced the platform successfully completed a test installation within just one week.
As Udo Abt noted during the BREKO session, this mirrors the evolution of the smartphone industry. Just as users transitioned from 4G to 5G without needing to learn how to operate a new device, htp’s engineers can upgrade the network technology while maintaining consistent, mastered workflows. This "abstraction" ensures that as technology generations evolve, the workforce remains empowered rather than overwhelmed.
Implications: A Roadmap for the Industry
The Looming "Second Migration"
The case of htp serves as a clarion call for the broader European telecom landscape. Many operators who were early to fiber a decade ago are currently approaching a critical juncture where their original equipment is nearing end-of-life.
For these providers, the lessons from the BREKO stage are twofold:
- Transition is Inevitable: Infrastructure technology generations turn over. The advantage rests with those who treat this turnover as a planned transition rather than a crisis.
- Software is the Foundation: Modernizing a network is no longer just about the physical fiber—it is about the software foundation. By integrating AI-supported predictive operations and robust management interfaces, operators can ensure that their network evolution is sustainable and scalable.
Strategic Foresight
Jochen Krauss’s concluding remarks emphasized that the competitive edge in the fiber market is no longer just about who builds the fastest, but who builds the most intelligently. By selecting vendors like Calix that provide open, hardened, and hardware-agnostic solutions, htp has protected itself from vendor lock-in, ensuring that their procurement remains flexible.
The transition to XGS-PON is not merely a technical upgrade; it is a shift toward a lean, software-defined, and highly efficient business model. As the industry looks toward the next ten years, the htp experience proves that fiber networks are not static assets. They are living, evolving systems that require a clear, long-term plan—a plan that htp has already set in motion, turning the challenge of a second migration into a foundation for future growth.
In an era of rising energy costs, increasing data demands, and the constant need for operational agility, htp’s "second wave" strategy provides a roadmap for every regional operator looking to maintain their relevance in an increasingly digital world. The future of fiber is not just about connecting homes; it is about connecting to a smarter, simpler, and more sustainable way of operating.
