Solutions for a connected world

The principle of permanent accessibility

As part of its research work concerning deployment of very high speed optical fibers, ACOME has discovered the principle of permanent accessibility.This solution, which, using a single cable, allows flexible and gradual deployment of connections, greatly reduces the infrastructure and connection costs.


It is ideal for transmitting very high speeds (1 GB per second); optical fiber is a technology that is perfectly suited to new services (video on demand, downloading, high definition TV, personal services, etc.) and allows almost instant access to every Internet website.Unlike in copper pairs used in xDSL technologies, the fiber signal suffers almost no attenuation with distance.

Operation according to needs

Developed by the engineering teams at ACOME, the new patented concept of permanent accessibility cable (PACe) consists in a centralized and shared architecture.The goal is to ensure the leading out of optical fibers at any position, depending on the connection demands of new subscribers.
Single wiring is installed in the building riser, in a conduit or on the façade.Inside the cable, fiber modules are not assembled but placed alongside one another over the entire length.A specific sheath protects the modules while leaving them free inside it.To make an immediate connection to the subscriber, it takes just two windows in the cable:through the first, the fiber to be connected is cut.It is then removed from the sheath through the second window (see diagram).The length of fiber recovered in this way can be up to several tens of meters in length.
ACOME engineers have also developed a solution with a single window, particularly useful when the cable is not easy to get to.Developed and patented by ACOME, it is based on the use of a dedicated tool (a flexible device with a remote-controlled blade), allowing the same connection to be obtained while opening only one window.It is inserted into the cable at the single window and allows the fiber to be cut and removed at a distance of up to 1.50 m.
These two methods are applicable both to underground conduits connecting various houses and to risers in buildings, as they are to façade installations, for instance in adjacent buildings.

The solution offers many advantages

  • Access to optical fiber anywhere along the cable without cutting it;
  • integration into congested infrastructures;
  • shorter cable lengths;
  • simplified operating tests;
  • fewer openings cut into slabs and walls and fewer associated sound nuisances;
  • a reduction of installation costs and of equipment to be used for implementation;
  • a reduction of congestion in the technical ducts;
  • the ease and safety of implementation by the small curve radius of the fiber (see sheet "small curve radius fibers");
  • the simplification of the cabling system (building foot box, floor junction box, etc.) allowing extended use by professionals