Vertical accessories
In the optical cabling of an apartment building, with apartments distributed over several floors, the crucial point is the point on each floor of the building, where the fibers extracted from the multi-fiber cable must be joined with the drop cable coming from the customer’s home.
Depending on the installation context, there are two ways of wiring and joining:
- If the installation context and the available spaces allow it, the drop cables coming from the housing units are spliced onto the respective single-fiber cables of the multi-fiber cable inside a floor box
- In other cases in which the available spaces are very small, the installation is carried out by providing for the use of a series of components to create a distributed junction system.
To facilitate the installation and termination of vertical cabling in apartment buildings, a specific series of accessories specially designed for this purpose has been created. These accessories are made of plastic material, and each accessory bears the customer’s logo, an identification code of the supplier and an indication of the month and year of production. The housing and management of the fibers guarantees compliance with the minimum bending radius of 15 mm or 10 mm respectively (according to the provisions of ITU Recommendation G.657A for fibers with low sensitivity to curvature) in the event that it is or is not the management of fiber optic stocks on the floor is foreseen.
Duratel accessories for vertical construction comply with Telecom Italia Technical Specifications n ° 933, they have been designed to be used in “brownfield” installations in association with multifiber “riser” cables extraction compliant with C.T. n ° 929 of Telecom Italia and are listed below:
The landing box is a protective shell, made up of two half-shells that can be installed in separate phases made of plastic material, which can be fixed to the multi-fiber cable with a simple coupling system, immediately after opening the riser cable of the window necessary to access the fibers and allows the extraction of the single fibers and their junction with the drop cables. It provides the possibility of hosting up to 6 joints between the extracted fibers and the respective fibers of the drop cables.
The floor box has internal dimensions compatible with the cable diameters and relative tolerances, while the external dimensions are the minimum possible (50 mm (W) x 70 mm (H) x 25 mm (D)), compatibly with the installation in typical floor junction boxes. The floor box supports the extraction and joining of at least 6 fibers by meeting the minimum radius of curvature requirements described above, and provides a simple interlocking fastening system for the drop cables that withstands a tensile force of 20N.
The floor branch is a protective shell, made of plastic material, consisting of two half-shells that can be installed in separate phases, which can be fixed to the multi-fiber cable with a simple coupling system, immediately after opening in the riser cable of the window necessary to access the fibers and allows the extraction of the single fibers and their junction with the drop cables. Its main function is to guide the extracted fibers, avoiding the possibility that they are inadvertently stressed or crushed during the closing of the protective shell. Its shape is as similar as possible to that of the cable and without pronounced edges, so as not to limit the operation required for the maintenance of copper or other existing connections. The guide of the extracted fibers guarantees compliance with the minimum bending radius of 10 mm.
The two parts that make up the floor shunt can be applied by interlocking, once all the fiber extraction operations have been completed; they have internal dimensions compatible with the cable diameters and relative tolerances while the external dimensions are the minimum possible (45 mm (W) x 50 mm (H) x 20 mm (P)).
The floor branch supports the extraction of at least 6 fibers in 6 distinct single fiber protective tubes, and of at least 2 fiber bundles in 2 distinct multifibre protective tubes, in both cases allowing to choose the best direction for extraction and satisfying minimum bending radius requirements.
the simple interlocking fastening system for the protective tubes inside the guides for the extracted fibers withstands a tensile force of 20N.
The single fiber protective tube is used to protect the length (~ 1 m) of fiber extracted from the multi-fiber cable for making the joint with the single cable coming from the housing unit near the riser.
It has an external diameter of 3 mm, while the internal diameter and the internal surface guarantee a low level of friction, favoring the insertion of the fiber.
The single fiber protective tube meets the traction requirements for the fixing system indicated above (20N) and has construction characteristics that allow a minimum radius of curvature of the tube without the occurrence of kink equal to 5 times the diameter of the tube.
The multi-fiber protective tube is used to protect a bundle of fibers extracted from the multi-fiber riser cable to the remote branch points managed with the secondary branch. The lengths involved in this case can be several meters.
It has an external diameter of 5 mm, while the internal diameter and the internal surface guarantee a low level of friction, favoring the insertion of the bundle of fibers (at least 4) inside. The presence of a pull element is necessary in consideration of the length for which it is intended to be used.
The multi-fiber protective tube meets the traction requirements for the fixing system indicated above (20N) and has construction characteristics that allow a minimum radius of curvature of the tube without the occurrence of kink equal to 5 times the diameter of the tube.
The secondary branch is a protective shell built in plastic material, consisting of two half-shells that can be installed in separate phases, which has the main function of allowing the branching of single fiber protective tubes, in those cases in which the floor in addition to the main junction box, there are also smaller junction boxes near the entrances to the housing units, where the joint with the single user cable is made. The rear part must be fixed to the multi-fiber inlet tube and must allow the extraction of the single fibers which will then continue inside the single fiber tubes towards the last branch boxes or towards the users’ pipes. Its function is to guide the fibers inside avoiding the possibility that they are inadvertently stressed or crushed. The fiber guide must ensure compliance with the minimum bending radius of 10 mm.
The two parts of which the secondary branch is composed are applicable by interlocking, once all the fiber extraction operations have been completed; they have internal dimensions compatible with the diameters of the protective tubes indicated above and the relative tolerances while the external dimensions are the minimum possible (40 mm (W) x 40 mm (H) x 12 mm (D)).
The secondary branch has at least 6 ports that allow you to continue the connection on each of the three sides other than the inlet with both multi-fiber protective tubes and single-fiber protective tubes depending on the installation context, in both cases allowing you to choose the best direction for extraction and meeting the minimum bend radius requirements.
the simple interlocking fastening system for the protective tubes inside the guides withstands a tensile force of 20N.
