Fibre rollout Stuttgart, SWS Fibre, FTTH Stuttgart: Technical requirements and modular splice systems for municipal network expansion 2026

The fibre rollout Stuttgart, SWS fibre, FTTH Stuttgart faces critical technical challenges: Stuttgart Municipal Utilities (SWS) must provide 133,000 households with future-proof fibre-optic infrastructure by 2026 while efficiently deploying modular splice systems offering up to 96 fibres in 1U. The current expansion phase in Baden-Württemberg’s state capital demonstrates the technical standards and system components required for successful municipal FTTH deployment.

Municipal utilities face the challenge of not only provisioning raw network infrastructure but also implementing scalable distribution systems. The combination of subsidised expansion projects worth 3.4 million euros for Stuttgart-Rotenberg and self-funded expansion across 17 city districts requires standardised splice solutions.

Technical framework for Stuttgart Municipal Utilities’ FTTH rollout

Stuttgart Municipal Utilities deploy a consistent single-mode fibre architecture compliant with ITU-T G.652.D for trunk routes and ITU-T G.657.A2 for building cabling in their fibre rollout Stuttgart, SWS fibre, FTTH Stuttgart programme. These bend-insensitive fibres enable bend radii of up to 10 mm without significant attenuation increase.

• Attenuation coefficient at 1310 nm: maximum 0.36 dB/km
• Attenuation coefficient at 1550 nm: maximum 0.23 dB/km
• Chromatic dispersion: < 18 ps/(nm·km) at 1550 nm
• Zero-dispersion wavelength: 1300–1324 nm

The network architecture is based on a two-tier model with main distribution frames (MDF) and street cabinets (SC). Each street cabinet typically terminates 48 to 96 fibres, using modular splice cassettes compliant with DIN EN 50173-1.

Modular splice systems for municipal network operators

Modular splice systems are essential for efficient fibre-optic infrastructure rollout. SWS Stuttgart deploys 19-inch systems with flexible configuration, enabling port density of up to 96 LC-duplex ports in 1U.

System type	Height units	Max. fibre capacity	Connector types	Application
SlimConnect	1U	96 fibres	LC, SC, E2000	Street cabinets
VarioConnect	3U	288 fibres	LC, SC, E2000, ST	Main distribution frames
VarioConnect	4U	384 fibres	LC, SC, E2000, MPO	Technical centres

Splice cassettes are certified to IEC 61756-1 and guarantee splice loss of < 0.1 dB for fusion splices. Each cassette accommodates 12 or 24 splice protection holders and incorporates integrated slack fibre storage.

Connector systems and standards compliance in municipal FTTH networks

The fibre rollout Stuttgart, SWS fibre, FTTH Stuttgart programme employs various connector systems meeting different requirements. The E2000 standard per IEC 61754-15 provides optimal protection in municipal distribution cabinets through integral dust shutter and bayonet coupling.

Connector selection follows technical criteria:

• E2000/APC: Return loss > 65 dB, for main distribution frames
• LC/APC: Compact form factor, insertion loss < 0.25 dB
• SC/APC: Robust design for outdoor cabinets
• MPO/MTP: 12-fibre connector for backbone links

Fiber Products quality commitment: As an official Diamond Partner and manufacturer, we produce modular splice systems in Europe. Benefit from Swiss precision and 5 years warranty on all our systems.

Network planning and fibre capacity for Stuttgart 2026

Technical planning for FTTH rollout requires precise calculation of required fibre capacities. Stuttgart plans 125 kilometres of new fibre-optic cable and 69 network distribution points by end of 2026. On average, each distribution point will serve 1,944 households.

City district	Planned household connections	Required fibres	Distribution locations
Stuttgart city centre	12,500	384	8
Stuttgart West	9,800	288	6
Bad Cannstatt	15,200	480	10
Vaihingen	11,300	384	7

Quality requirements and measurement technology for municipal fibre networks

Quality assurance in the fibre rollout Stuttgart, SWS fibre, FTTH Stuttgart programme is based on defined measurement protocols per IEC 61280-4-1. Every installed section is measured using optical time-domain reflectometry (OTDR) at 1310 nm and 1550 nm.

Acceptance criteria for municipal networks include:

• Section attenuation: < 0.4 dB/km including all splice points
• Connector loss: < 0.5 dB per connection
• Return loss: > 45 dB for PC finish, > 60 dB for APC
• Macrobend loss: < 0.1 dB at R = 15 mm

Splicing technique and installation efficiency in urban environments

Splicing work in urban Stuttgart requires particular efficiency. Modern fusion splicers with core alignment achieve splice times of under 7 seconds with typical loss of 0.02 dB. For the planned 69 distribution locations, approximately 33,120 individual splices will be performed.

Pre-terminated splice cassettes significantly reduce installation time. A complete 96-fibre distribution frame can be installed and documented in under 4 hours. The Splice Box 1U SlimConnect enables double packing density compared to conventional systems.

Cost-effectiveness of modular systems for municipal utilities

The fibre rollout Stuttgart, SWS fibre, FTTH Stuttgart programme benefits from modular design cost-efficiency. Initial investment is reduced by up to 40 percent because only actually required modules are installed. Later expansions proceed without service interruption.

• Reduced inventory through standardised modules
• Simplified maintenance via replaceable components
• Scaling from 12 to 288 fibres without system replacement
• Unified documentation per TIA-606-C

Fiber Products’ fibre-optic solutions for municipal utilities provide the required flexibility for municipal network operators. As Diamond Partner, we guarantee 5 years warranty on all splice systems.

Network documentation and operational management

Structured documentation per DIN EN 50174 is essential for sustainable operation of municipal fibre networks. Stuttgart implements digital documentation systems with GIS integration for managing over 125 kilometres of cable routes.

Each splice point is recorded with the following parameters:

• GPS coordinates with < 1 metre accuracy
• Attenuation values at 1310 nm and 1550 nm
• Fibre type and manufacturing date
• Splice date and technician name
• OTDR measurement curves as PDF report

Future-proofing and technology migration

The fibre rollout Stuttgart, SWS fibre, FTTH Stuttgart programme accounts for upcoming technology generations. Installed single-mode fibres readily support XGS-PON with 10 Gbit/s symmetrical and are prepared for NG-PON2 with 40 Gbit/s.

Modular splice systems enable straightforward migration through:

• Interchangeable connector modules for new standards
• Reserve capacity of at least 30 percent
• Compatibility with WDM technology for wavelength division multiplexing
• Preparation for 400G Ethernet in backbone

Frequently asked questions on FTTH rollout for municipal utilities

Which splice systems are suitable for municipal distribution cabinets?

For municipal applications, 19-inch systems per IEC 60297 with maximum depth of 300 mm are recommended. The SlimConnect series offers 96 fibres in 1U and is ideal for space-constrained distribution cabinets.

How many fibres should be planned per household?

Technical guidelines recommend 2 fibres per housing unit plus 25 percent reserve. For multi-unit residential buildings with 12 units, 30 fibres should be provisioned.

Which connector types are optimal for outdoor distribution cabinets?

The E2000 connector with integrated dust shutter and IP65 rating when closed provides optimal protection. Alternatively, SC/APC connectors with separate dust caps are suitable.

How is quality assurance performed for mass splicing?

Every splice is automatically logged by the splicer with loss value and timestamp. Additionally, OTDR measurement per IEC 61280-4-1 is performed for each cable section.

Which standards apply to municipal fibre networks?

Key standards are DIN EN 50173-1 for structured cabling, DIN EN 50174 for installation, and VDE 0888 for optical fibre cables.

How long does installation of a 96-fibre distribution frame take?

With pre-terminated modules and trained personnel, complete installation including splicing and documentation requires approximately 4 to 6 hours per distribution frame.

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