FTTH drop construction: how fibre optic is installed in a building

What fibre blowing and pulling means

The fibre reaches the building by one of two methods. Blowing means that the fibre is blown into an existing protective microduct: a thin tube pre-laid along the route. This is a fast and fibre-friendly method, used mainly where the microduct has been installed in advance, for example in new builds or where the network provider laid the infrastructure with future customer connections in mind. Cable pulling Conversely, this method is used where the conduit is missing or the route takes a different path, for example along the building façade or in a riser, in such cases, the cable is pulled using a standard pull. The choice of method always depends on the condition of the route and the accessibility of the property; both methods may also be combined on different sections of a single connection.

In older buildings without a pre-installed protective conduit, the initial section of the route, passing through external walls, cellars or common areas: often presents the greatest challenge. Here, compromises are frequently needed between implementation speed and aesthetic finish, particularly in heritage-protected properties or buildings with an owners' association that has specific requirements for the appearance of common spaces. In such cases, it is worthwhile to discuss routing options in advance to avoid having to redo the installation later due to objections against visible cabling.

Typical project workflow

1. Enquiry and route survey - the fibre route, the distance from the provider's distribution cabinet to the flat or office, and whether a protective enclosure exists along the path.
2. Arrangement with the internet provider - technical specification of the connection point, connector type and capacity required for the drop.
3. Route preparation - wall penetrations, installation of protective conduit where missing, cooperation with the building manager or the building's owners' association.
4. Fibre blowing or pulling depending on the selected method.
5. Termination and splicing - The fibre is terminated in an optical socket or cabinet and spliced to the backbone cable. by splicing.
6. Measurement and handover of the test report - verification of functionality and attenuation of the entire route by OTDR measurement.
7. Handover to the customer or internet service provider, which activates the connection.

For a simple connection in an apartment building with a prepared protective duct, the entire physical implementation: from blowing through to termination and testing, can usually be completed during a single visit. If a protective duct also needs to be installed or penetrations addressed, the order will logically extend by the time required for construction preparation.

Cooperation with internet service providers

The connection is usually ordered by the internet provider; the technician carries out the physical installation on their instructions, or directly for an investor or developer preparing the property for future connectivity. It is crucial to comply with the technical parameters required by the provider, connector type, maximum permissible attenuation, socket location and design, so that after handover the connection can be activated on the provider's side without complications.

In practice, it is advisable to agree on parameters in writing before work begins; this avoids repeated site visits if the implementation does not match what the provider needs to activate on their end. For development projects with multiple units, it is also worthwhile to plan routes and reserve capacity with a view to future demand, as several tenants or owners may wish to install their own connection at the same time.

What to consider before starting work

• Ensure access to all floors and spaces along the route.
• Verify consent from the owner or the building's owners' association for cable penetrations and routing in common areas.
• Leave a reserve of fibre in the cassette for any future repair or reconnection.
• ensure marking of the route for future maintenance, this will also facilitate any potential... service intervention

A well-planned and documented connection saves time and costs during any future intervention, whether it is expanding capacity, relocating an outlet, or repairing damage.

The final, yet no less important step is the handover of documentation: the record of the actual fibre route, splice locations and measured attenuation values. Without it, any future intervention, whether planned modification or emergency repair, significantly slower, as the technician must first re-map the route.