Box insert for a fiber optic subscriber connection for installation in an installation box and use of a fiber optic cable section

Abstract

The invention relates to a socket insert (1) for a fiber optic subscriber connection for installation in an installation box (25). The socket insert (1) comprises a support plate (2) for fastening the socket insert (1) to an installation box (25) and a coupling holder (3) connected to the support plate (2) for a fiber optic coupling device (4). The socket insert (1) further comprises a splice cassette (5) at least indirectly connected to the support plate (2) for receiving at least one fiber optic cable (6).

Description

The invention relates to a socket insert for a glass fibre subscriber connection for installation in an installation socket, in particular for installation in a flush-mounted installation socket.When installing such socket inserts for fiber optic subscriber connections, it is necessary to protect the comparatively sensitive fiber optic cables from damage. The reason for this is that glass fibre lines cannot be easily repaired or even extended in the event of damage or even breakage, as is the case, for example, with electrical lines made of copper.Furthermore, when connecting glass fiber lines, it must be ensured that permissible bending radii of the glass fiber lines are not undershot, since this can lead to damping in the glass fiber connection produced with the glass fiber line. In the worst case, if a permissible bending radius is undershot, there is also a risk of a failure of the glass fiber connection. In the event of damage to a glass fiber line, it is therefore expedient to provide certain reserve lengths already during the installation. However, these reserve lengths must be stored on such can inserts in some form so as to be protected from damage.EP 3 798 702 A1 discloses a connection box for optical waveguides, in particular in the form of a flush-mounted box, containing: a cable reservoir for depositing different excess lengths of an optical waveguide connection cable, a splice cassette comprising a splice receptacle for one or more splices and comprising a fiber receptacle for receiving different excess lengths on individual optical fibers and / or for receiving unused optical fibers, a holder for receiving a connection device for connecting an optical conductor to the connection box, wherein the cable reservoir and the splice cassette are present in regions spatially separated from one another, and wherein the cable reservoir is mounted movably with respect to the splice cassette, so that the splice cassette can be closed with the cable reservoir.EP 2 068 185 A1 discloses a junction box for optical waveguides, comprising an installation housing which can be installed in a wall opening, a flush-mounted or a flush-mounted box to which at least one optical waveguide cable can be guided on the rear side, a mounting arrangement which is fastened or can be fastened to the installation housing in the region of a front side, and a cover which is fastened or can be fastened to the mounting arrangement. The mounting arrangement is a mounting plate, on the top side of which means for receiving and / or fixing excess lengths of the optical waveguide cable and, if appropriate, at least one splice are arranged.DE 10 2019 130 031 B3 discloses a connection socket for connecting at least one external optical cable with plug, which is provided for installation in a preinstalled receptacle, in particular a flush-mounted socket. The connection socket comprises an outer socket which can be fixedly connected to the receptacle, an inner socket which can be received at least partially in the outer socket and on or in which at least one optical waveguide located in the receptacle can be wound, at least one optical waveguide coupling for connecting two plugs, wherein a first plug is provided on an optical waveguide located in the receptacle and a second plug is provided on an external optical cable to be connected, a coupling holder which can be fastened to the inner socket or is formed thereon for receiving the at least one optical waveguide coupling, and a front panel which can be fastened to the inner socket or to the coupling holder and has at least one cutout through which the at least one optical waveguide coupling which is inserted as intended into the coupling holder is accessible for connecting an external optical cable to the plug. The outer can and the inner can each have a latching or toothed structure which can be brought into engagement with one another in different angular positions and by means of which the inner can can can be fixed in the different angular positions in a rotationally fixed manner within the outer can.DE 10 2021 115 742 A1 discloses a can insert of the type mentioned at the beginning, which has a support plate with a drum which projects axially from a rear side of the support plate in the direction of its central axis and is intended for winding at least one glass fibre line around the drum. The drum is rotatable on the support plate relative to the support plate about its central axis. Thus, a reserve length of optical fiber can be easily wound by rotating the drum around the central axis.It is the object of the invention to provide a can insert of the type mentioned at the beginning which represents an alternative to the can insert known from the prior art and is additionally distinguished by its particularly good use properties.To achieve the object, a can insert having the features of the independent claim directed to such a can insert is proposed. The socket insert according to the invention for a glass fibre subscriber connection for installation in an installation socket has a support plate for fastening the socket insert to an installation socket and a coupling holder connected to the support plate for at least one glass fibre coupling for connecting optical connectors of glass fibre lines. The can insert is characterized in that it has a splice cassette, which is connected at least indirectly to the supporting plate, for receiving at least one glass fibre line. In the splicing cassette, a reserve length of a glass fibre line can be stored particularly comfortably and additionally also safely.According to the invention, the splicing cassette is connected to the supporting plate via the coupling holder. Thus, the coupling holder functions on the one hand as a fastening means for the splice case on the support plate and on the other hand as a holder for optical connectors.In one embodiment of the can insert, the splice cassette and the coupling holder can form a materially homogeneous monolithic unit, that is to say can be connected integrally to one another. Such a coupling holder, which is integrally connected to a splicing cassette, can be produced from plastic, for example, in an injection molding process. This embodiment of the can insert enables a particularly simple assembly of the can insert, since the coupling holder and the splice cassette are then present as one part and the number of assembly steps for assembling the can insert is thus correspondingly reduced.According to the invention, the splice cassette is arranged at an acute angle to the support plate, in particular to the rear side of the support plate, which faces the installation box in the position of use of the can insert. The splicing cassette can, for example, span an angle of 40° to 45° with the supporting plate.The splicing cassette can be arranged at the acute angle in particular to an upper section of the support plate in the position of use of the can insert.As will be explained in more detail below with reference to the figures, this alignment of the splice case on the support plate enables particularly comfortable mounting of the can insert in an installation can and also the simple storage of glass fibre lines in the splice case.The oblique position of the splice cassette relative to the supporting plate makes it possible to accommodate the splice cassette in the installation box in a particularly space-saving manner when the can insert is inserted into the installation box. The oblique position of the splicing cassette enables the size of the splicing cassette to be maximized and therefore the reserve length of the at least one glass fiber line to be stored particularly comfortably. Maximizing the overall size of the splice case also makes it possible to maintain relatively large permissible bending radii, which must not be undershot when accommodating the reserve length of the glass fiber line in the splice case, in order to prevent damage to the glass fiber line and / or unacceptable damping in the glass fiber connection.The splice cassette can have a receiving space for at least one glass fibre line. The receiving space can be formed on a side of the splice cassette facing away from the support plate. The receiving space can be accessible via a storage opening which is arranged on a side of the splice cassette facing away from the carrier plate in the position of use of the splice cassette. A glass fibre line can be introduced via the deposition opening into the receiving space of the splicing cassette and deposited there.For storing the reserve length of the at least one glass fiber line in the splice case, the can insert can be arranged on an installation box in such a way that the support plate faces the installation box with its front side facing away from the splice case and is additionally rotated by 180° about a longitudinal central axis of the can insert. Thus, the receiving space of the splicing cassette points obliquely upwards. This enables a particularly convenient, two-handed storage of the reserve length of the at least one glass fiber line in the receiving space of the splice case without having to hold the can insert in one hand for this purpose.The coupling holder of the can insert can define an insertion direction for patch cables on a front side of the can insert facing a user in the use position, which front side is oriented at an acute angle to the direction of gravity when the can insert is in the use position.The insertion direction for patch cables, which is predetermined by the coupling device, then points obliquely downwards starting from the support plate of the socket insert, so that any protrusion of optical connectors of the patch cables on the front side of the socket insert is minimized. This can minimize the risk of damage to inserted patch cables at the front of the can insert, for example by persons or objects. The insertion direction can be predefined by correspondingly oriented coupling receptacles of the coupling holder. Optical fiber couplings for optical plug connectors can be inserted into the coupling receptacles.The coupling holder can have, for example, two or more coupling receptacles for glass fiber couplings. In each coupling receptacle, a glass fiber coupling can be or can be arranged for one or also two glass fiber plug connections in each case.The receiving space of the splice case for at least one glass fibre line can be bounded on the outside at least in sections by wall sections oriented transversely or at right angles to a base plate of the splice case. The wall sections of the splice case can thus serve as a protection for a glass fibre line arranged in the receiving space of the splice case. A reserve length of a glass fiber line arranged within the splice cassette is thus particularly well protected from mechanical influences within the splice cassette which could act on the glass fiber lines during the insertion of the can insert into an installation box already because of the comparatively narrow installation space which such an installation box makes available.It is particularly advantageous if the splice cassette has, for example in its receiving space, a splice tray for at least one splice protector. Within the splice tray, a splice connection between an end of a glass fibre line stored in the splice cassette and a so-called pigtail cable can be stored protected by a splice protection. A pigtail cable is understood to be a glass fiber cable prefabricated as a connecting cable, which is provided with an optical connector at one end and whose free cable end is spliced to one end of a glass fiber line.The splice cassette can have, in particular in its receiving space, at least one guide structure for glass fibre lines. The guide structure can have a rounded outer contour, preferably a cylindrical and / or oval outer contour, which ensures that an admissible bending radius is not undershot when depositing glass fibre lines in the splice cassette.In an advantageous embodiment of the splice cassette, it is provided that it has, for example in its receiving space, two guide structures for glass fibre lines which are arranged next to one another and are spaced apart from one another. In this case, the guide structures can each have a rounded, preferably cylindrical and / or oval, outer contour.Because the two guide structures are spaced apart from one another within the receiving space of the splice cassette, it is possible to deposit glass fibre lines in different deposition patterns in the receiving space of the splice cassette. The optical fiber lines can be deposited in the splicing cassette in an annular or oval pattern or also in an eighth pattern, in which the optical fiber lines are alternately wound around one and the other guiding structure.The splice cassette can furthermore have, in particular in its receiving space for glass fibre lines, at least one holding-down device for glass fibre lines. The at least one hold-down device of the splice cassette can considerably simplify the storage of glass fibre lines in the splice cassette. Bent optical fiber lines have an intrinsic stress which causes the optical fiber lines to tend to return to their unbent initial position. The at least one holding-down device makes it possible to hold the glass fibre lines stored in the splicing cassette and under tension within the splicing cassette.It is particularly preferred if the splicing cassette has a plurality of, in particular uniformly distributed, hold-downs for glass fibre lines. The at least one guiding structure of the splicing cassette can be arranged between hold-down devices of the splicing cassette for glass fibre lines. It is particularly advantageous if at least one holding-down device is also arranged on such a guide structure. The at least one guide structure can advantageously be surrounded uniformly by hold-downs. This enables a particularly comfortable and quick storage of glass fibre lines in the receiving space of the splice cassette.The can insert can furthermore have, in particular on the splice cassette, a glass fibre cable holder. The fiber optic cable holder may be, for example, a snap clamp. It is particularly preferred, because of space saving, if the optical fiber cable holder is arranged within a guide structure for optical fiber lines of the splice cassette. By means of the optical fiber cable holder, a mains-side optical fiber cable present in the installation box can be fastened to the splice cassette.The can insert may further include a glass fiber strain relief. With the aid of the glass fibre cable strain relief it is possible to connect reinforcing fibres, for example aramid fibres, which comprise a glass fibre cable to which the can insert is to be connected, to the can insert. In this way, possibly tensile forces acting on the comparatively sensitive glass fiber lines of the glass fiber cable can be absorbed via this reinforcing fiber.In a structurally simple embodiment of the optical fiber cable strain relief, it comprises a screw which is screwed onto the coupling holder of the socket insert and by means of which the reinforcing fibers of an optical fiber cable can be connected to the socket insert and, if appropriate, even prestressed.The support plate can have a receiving opening for receiving a coupling holder, which serves for receiving and operatively connecting two optical connectors to one another at the end face. The optical connectors allow a terminal to be connected to the fiber optic cable connected to the socket insert.The invention also relates to the use of a bent glass fibre cable section on a socket insert for a glass fibre subscriber connection according to one of the claims directed to such a socket insert for protecting at least one pigtail cable on the socket insert.The bent optical fiber cable portion may be an optical fiber cable portion of a net-side optical fiber cable that is present in an installation box to be equipped with the box insert.By means of the bent glass fiber cable section on the can insert, pigtail cables located on the can insert can be protected particularly well and easily from mechanical influences. In this case, the bent optical fiber cable section can be arranged such that the pigtail cables are positioned between a supporting plate of the can insert and the bent optical fiber cable section. When the socket insert is inserted into the installation socket, the bent glass fibre cable section is thus arranged in front of the pigtail cable or cables in the direction of insertion of the socket insert into the installation socket. The bent optical fibre cable section can thus absorb any shocks which may occur when contacting the installation box or a wall in which the installation box is arranged, before they act on the pigtail cables, which are significantly more delicate and therefore more sensitive compared to the optical fibre cable section.A pigtail cable is understood to mean a glass fiber cable which is prefabricated on one side with an optical connector, in particular an optical plug connector, and is not prefabricated on the other side. In this case, the unpackaged side of the pigtail cable is spliced directly to a glass fiber of a glass fiber line (fiber-fiber splice, non-separable connection of two glass fibers) and then laid in the splice tray of the splice cassette in a manner protected by a splice protector.The invention is described in more detail below with reference to an exemplary embodiment, but is not limited to this exemplary embodiment. Further exemplary embodiments result from a combination of the features of individual claims or of a plurality of claims with one another and / or by a combination of individual features or of a plurality of features of the exemplary embodiment. The following are shown: FIG. 1 is a perspective front view of a can insert which has a coupling holder for glass fibre couplings on the rear side of its supporting plate and a splicing cassette which is connected to the supporting plate via the coupling holder and is intended to receive glass fibre lines, FIG. 2 is a rear perspective view of the can insert of FIG. 1 , FIG. 3 shows a rear view of the can insert from FIGS. 1 and 2, FIG. 4 is a perspective bottom view of the rear side of the socket insert from FIGS. 1 to 3 to illustrate a receiving space of the splicing cassette for glass fibre lines, FIG. 5 is a rear view of the socket insert of FIGS. 1 to 4 without a glass fiber cable, FIG. 6 is a side view of the can insert, cut along the line denoted by A-A in FIG. 5, FIG. 7 is an exploded view of the can insert shown in the preceding figures, FIG. 8 is an exploded perspective view of the coupling bracket and splice tray of the can insert shown in the previous figures, FIG. 9 is an exploded view of the splicing cassette of the can insert shown in the preceding figures, FIG. 10 shows a perspective illustration of the can insert shown in the preceding figures in its orientation shown in FIG. 2 on an installation can, wherein the orientation of the can insert and its temporary fastening on the installation can allow a particularly comfortable placement of the glass fibre lines in the splice cassette of the can insert, FIG. 11 is a perspective view of the can insert from FIG. 10 before being inserted into the installation can, FIG. 12 shows a perspective illustration of the installation box shown in FIGS. 10 and 11 and equipped with the box insert, and FIG. 13 shows a perspective illustration of the installation box shown in FIG. 12 with a panel on the front side of the box insert.All figures show at least parts of a socket insert, generally designated 1, for a glass fibre subscriber connection for installation in an installation socket 25, the socket insert 1 having a supporting plate 2 for fastening the socket insert 1 to an installation socket 25 and a coupling holder 3 connected to the supporting plate 2. The coupling holder 3 serves to receive glass fibre couplings 4. the coupling holder 3 can have latching hooks which engage in corresponding latching openings of the supporting plate 2 in order to fix the coupling holder 3 to a rear side of the supporting plate 2.The can insert 1 further comprises a splicing cassette 5 which is at least indirectly connected to the supporting plate 2 and is intended to accommodate an excess length of at least one glass fibre line 6, and the splicing cassette 5 is connected to the supporting plate 2 via the coupling holder 3.In the embodiment of the can insert 1 shown in the figures, the splice cassette 5 and the coupling holder 3 are present as separate parts from one another, as illustrated for example by the exploded views of FIGS. 7 and 8. The coupling holder 3 and the splicing cassette 5 are connected to one another via a latching connection.In an embodiment of the can insert 1 not shown in the figures, the splice cassette 5 and the coupling holder 3 form a materially homogeneous monolithic unit, i.e. are connected to one another in one piece.The splicing cassette 5 is arranged at an acute angle of about 40-45° to the supporting plate 2. In this case, the splice cassette 5 clamps the acute angle with its rear side to an upper section of the rear side of the supporting plate 2 in the position of use of the can insert 1 in or on an installation can 25.FIG. 1 shows not only the acute angle between the splicing cassette 5 and the supporting plate 2, but also the can insert 1 in an orientation which corresponds to its orientation in the position of use on or in an installation can 25.The coupling holder 3 specifies, by means of correspondingly oriented coupling receptacles 4 for optical connectors 20, an insertion direction for patch cables 23, which, when the socket insert 1 is located in an installation socket 25 in the use position, is oriented at an acute angle to the direction of gravity.The alignment of the patch cables 23 with respect to the support plate 2 can be seen, for example, in FIG. 1, wherein the support plate 2 is aligned parallel to the direction of gravity.This insertion direction for the patch cables 23 defined by the coupling receptacles 4 of the coupling holder 3 has the result that the patch cables 23 on the front side of the support plate 2 are oriented obliquely downwards and therefore do not project as far into a free space on the front side of the support plate 2. This protects the inserted patch cables 23 from mechanical damage.For example, FIGS. 2, 3, 4 or also 8 and 9 show that the splicing cassette 5 has a receiving space 8 for glass fibre lines 6. The receiving space 8 is accessible via a placement opening 9, through which glass fibre lines 6 can be placed into the receiving space 8. The storage opening 9 is formed on a side of the splicing cassette 5 facing away from the support plate 2 in the position of use of the splicing cassette 5. The receiving space 8 is bounded on the outside at least in sections by wall sections 11 oriented transversely or at right angles to a base plate 10 of the splice case 5. The wall sections 11 serve to protect the glass fibre lines 6 placed in the receiving space 8.FIGS. 2 and 10 show the can insert 1 in an orientation in which the splice cassette 5 is aligned with its receiving space 8 and the placement opening 9 in a particularly favorable manner for placing glass fibre lines 6 in the receiving space 8.For this purpose, the can insert 1 is arranged rotated through 180 degrees in comparison with FIG. 1, so that the storage opening 9 points upward toward the receiving space 8 of the splice cassette 5. When the socket 1 is temporarily fixed to an installation socket 25 in this position, as shown in FIG. 10, a person who is to connect the optical fiber cable 7 and its optical fiber lines 6 to the socket 1 can do both-handedly depositing the optical fiber lines 6 into the receiving space 8 of the splice case 5. This facilitates the handling of the can insert 1 considerably during its assembly.Due to the orientation of the splice cassette 5 at an acute angle of approximately 40° to 45° to the rear side of the support plate 2, the receiving space 8 and the storage opening 9 then point obliquely upwards when the can insert 1 according to FIG. 2 is oriented, which facilitates the storage of glass fibre lines 6 into the receiving space 8 of the splice cassette 5.In its receiving space 8 for the glass fibre lines 6, the splice cassette 5 has a splice tray 12. A total of four splice protectors 13 can be placed in the splice tray 12, which are shown, for example, in the exploded view of FIG. 7. The splice tray 12 comprises two parallel receiving grooves into which in each case two of the four splice protectors 13 can be placed side by side.Two guide structures 14 for glass fibre lines 6 are formed within the receiving space 8 of the splice cassette 5. Each of the guide structures 14 has a rounded, cylindrical or oval outer contour 15.The two guide structures 14 arranged next to one another are spaced apart from one another according to FIGS. 8 and 9. This enables the deposition of glass fibre lines 6, for example also in an eighth arrangement around the two guide structures 14.In its receiving space 8, the splice cassette 5 also has a plurality of hold-down devices 16 for glass fibre lines 6. The holding-down devices 16 are arranged both on the wall sections 11 of the splicing cassette 5 already mentioned and on the two guide structures 14. In particular, the representations of the splicing cassette 5 of FIGS. 8 and 9 illustrate that the hold-downs 16 are arranged in a uniformly distributed manner within the receiving space 8 of the splicing cassette 5.The holding-down devices 16 serve to fix glass fibre lines 6 deposited in the receiving space 8 of the splicing cassette 5 under residual stress in the receiving space 8 counter to their restoring force. The glass fibre lines 6 are placed in the receiving space 8 of the splicing cassette 5 in the bent state. As a result, the optical fiber lines 6 get under voltage. As a result of the tension, the glass fibre lines 6 tend to move back into their unbent starting position. The wall sections 11 and the hold-down devices 16 of the splicing cassette 5 counteract this tendency and reliably hold the deposited glass fibre lines 6 in the receiving space 8 of the splicing cassette 5.The splice case 5 further comprises a fibre optic cable holder 17. This is designed as a snap-in clamp and is arranged in a space-saving manner within one of the two guide structures 14 for glass fibre lines 6 of the splice cassette 5. FIG. 2 illustrates how a glass fiber cable 7 can be fixed to the splice cassette 5 with the aid of the glass fiber cable holder 17.Furthermore, the socket insert 1 has a glass fibre cable strain relief 18 in the form of a screw on the coupling holder 3. With the aid of the glass fiber cable strain relief 18, it is possible to fix an aramid fiber reinforcement of the glass fiber cable 7 on the can insert 1, which is not shown in the figures, and thus to ensure strain relief of the glass fiber lines 6 of the glass fiber cable 7 freed from a sheathing of the glass fiber cable 7 in the splice cassette 5.The support plate 2 has a receiving opening 19 for receiving the aforementioned coupling holder 3. The coupling holder 3 serves for receiving and operatively connecting optical connectors 20 to one another at the end face. For this purpose, glass fiber couplings 24 are inserted into the coupling receptacles 4 of the coupling holder 3. At the rear of the base plate 2, optical connectors 20 as parts of pigtail cables 22 are inserted into the coupling bracket 3. The pigtails 22 are connected via a splice connection to the glass fiber lines 6 deposited in the splice cassette 5. The splice connections are protected by the splice protectors 13 and are located in the splice tray 12 of the splice cassette 5.The pigtails 22 are protected from damage by the bent fiber optic cable portion 21 of the fiber optic cable on the splice cassette 5. The bent glass fibre cable section 21, which is relatively stable compared to the filigran pigtails 22, prevents the pigtails 22 lying behind from being damaged during the insertion of the can insert 1 into an installation can 25.On a front side of the supporting plate 1, four optical connectors 20 are inserted into optical fiber couplings 24 which are arranged in the coupling receptacles 4 of the coupling holder 3. These four front-side optical connectors 20 on the patch cables 23 are connected to the connectors 20 of the pigtail cables 22.FIGS. 10 to 13 illustrate the mounting of the can insert 1 into an installation can 25, which in the exemplary embodiment shown is designed as a flush-mounted can.For the connection and for the storage of the glass fibre lines 6 in the splice cassette 5, the socket insert 1 can first be arranged on the installation socket 25 in the orientation shown in FIG. 10. For this purpose, the can insert 1 can be suspended with its support plate 2 on screws 27 which are present on the installation can 25 for later fixing of the can insert 1 in the installation can 25.After the connection and deposition of the glass fibre lines 6, the socket insert is rotated into the position shown in FIG. 11 and inserted into the installation socket 25. In this case, the bent glass fiber cable section 21 can function as a protection for the pigtail cables 22 on the can insert 1.FIG. 12 shows the can insert 1 in the installation can 25, The can insert 1 positioned in the installation can 25 is then provided, according to FIG. 13, with a cover 26 which is fixed to the front side of the supporting plate 2 of the can insert 1.List of reference characters1 Socket insert 2 Support plate 3 Coupling holder 4 Coupling receptacle 5 Splice cassette 6 Glass fibre cable 7 Glass fibre cable 8 Receiving space for 6 in 5 9 Storage opening 10 Base plate 11 Wall section 12 Splice storage 13 Splice protection 14 Guide structure 15 Outer contour of 14 16 Holding-down device 17 Glass fibre cable holder 18 Glass fibre cable strain relief 19 Receiving opening in 2 20 Optical connector 21 Glass fibre cable section 22 Pigtail cable 23 Patch cable 24 Glass fibre coupling 25 Installation socket 26 Panel 27 Screw

Claims

A socket insert (1) for a glass fibre subscriber connection for installation in an installation socket (25), comprising a support plate (2) for fastening the socket insert (1) to an installation socket (25) and a coupling holder (3) connected to the support plate (2) for at least one glass fibre coupling (24) for connecting optical connectors (20) of glass fibre lines (6), wherein the socket insert (1) has a splice cassette (5) connected at least indirectly to the support plate (2) for receiving at least one glass fibre line (6), characterized in that the splice cassette (5) is connected to the support plate (2) via the coupling holder (3), and in that the splice cassette (5) is arranged at an acute angle to the support plate (2).The can insert (1) according to claim 1, wherein the splice cassette (5) and the coupling holder (3) form a materially homogeneous monolithic unit.The can insert (1) according to any one of the preceding claims, wherein the splice cassette (5) is arranged at an acute angle to the support plate (2), namely to an upper portion of the support plate (2) in the position of use of the can insert (1) in an installation can (25), and / or wherein the angle is 40° to 45°.The socket insert (1) according to any one of the preceding claims, wherein the coupling holder (3) defines an insertion direction for patch cables (23) which, when the socket insert (1) is located in an installation socket (25) in the use position, is oriented at an acute angle to the direction of gravity.The can insert (1) according to any one of the preceding claims, wherein the splice cassette (5) has a receiving space (8) for at least one glass fibre line (6).The can insert (1) according to the preceding claim, wherein the splicing cassette (5) has a storage opening (9) which is formed on a side of the splicing cassette (5) facing away from the supporting plate (2) in the position of use of the splicing cassette (5), and / or wherein the receiving space (8) is bounded on the outside at least in sections by wall sections (11) oriented transversely or at right angles to a base plate (10) of the splicing cassette (5).The can insert (1) according to any one of the preceding claims, wherein the splice cassette (5), in particular in its receiving space (8) for glass fibre lines (6), has a splice tray (12) for at least one splice protector (13).The can insert (1) according to any one of the preceding claims, wherein the splice cassette (5), in particular in its receiving space (8) for glass fibre lines (6), has at least one guide structure (14) for glass fibre lines (6), in particular wherein the guide structure (14) has a rounded, preferably cylindrical and / or oval, outer contour (15).The can insert (1) according to any one of the preceding claims, wherein the splice cassette (5), in particular in its receiving space (8) for glass fibre lines (6), has two guide structures (14) for glass fibre lines (6) which are arranged next to one another and are spaced apart from one another, in particular wherein the guide structures (14) each have a rounded, preferably cylindrical and / or oval, outer contour (15).The can insert (1) according to any one of the preceding claims, wherein the splice cassette (5), in particular in its receiving space (8) for glass fibre lines (6), has at least one holding-down device (16) for glass fibre lines (6), preferably wherein the splice cassette (5) has a plurality of, in particular uniformly distributed, holding-down devices (16) for glass fibre lines (6).Can insert (1) according to the preceding claim, wherein the at least one guide structure (14) is arranged between hold-downs (16) of the splice cassette (5) for glass fibre lines (6), in particular wherein at least one hold-down (16) is arranged on the at least one guide structure (14).The can insert (1) according to any one of the preceding claims, wherein the can insert (1), in particular on the splice cassette (5), has a glass fibre cable holder (17), in particular a latching clip, in particular which is arranged within a guide structure (14) for glass fibre lines (6).The can insert (1) according to any one of the preceding claims, wherein the can insert (1), in particular on the coupling holder (3), has a glass fibre cable strain relief (18), in particular a screw.Can insert (1) according to one of the preceding claims, wherein the support plate (2) has a receiving opening (19) for receiving a coupling holder (3) which serves for receiving and operatively connecting optical connectors (20) to one another at the end face, in particular wherein the coupling holder (3) has coupling receivers (4) for glass fibre couplings (24).Use of a bent optical fibre cable section (21) for protecting at least one pigtail cable (22) on a socket insert (1) for an optical fibre subscriber connection according to one of the preceding claims.

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