Patent Application
20080002371
The invention relates to a carrier of a distribution point in the field of telecommunications as well as a distribution point comprising at least one carrier.
In the field of telecommunications numerous customers are connected with the switch of a telecommunications company via telecommunication lines. The customers can also be called subscribers. The switch is also called an exchange. Between the subscriber and the switch, sections of the telecommunication lines are connected with telecommunications modules. The telecommunications modules establish an electrical connection between a wire, which is connected at the telecommunications module at a first side, and another wire, which is connected to the telecommunications module at a second side. The telecommunications modules may comprise a housing in which wire guides are integrated. Furthermore, one or more printed circuit boards can be integrated with the telecommunications modules and can extend from the housing of a telecommunications module.
The described telecommunications modules can be located at any type of distribution point. A typical distribution point is the main distribution frame located in the central office of a telecommunications company. However, further distribution points are known in the art, such as distribution points outside the central office, which e.g. serve a number of streets or houses. Also office buildings or floors within buildings can have distribution points.
The distribution points usually comprise carriers of a suitable type, such as racks or sub-racks, to which the telecommunications modules can be mounted. These carriers can comprise a so-called back-mount frame, which has a structure that is adapted to a particular type of telecommunications module. The back-mount frames can comprise elongate, trough-like structures comprising parallel walls, to which telecommunications modules can be mounted, e.g. by latching mechanisms. The walls can comprise openings at regular intervals so as to define a predetermined spacing, or pitch, for the telecommunications modules mounted thereon. Furthermore, the applicant's subsidiary, Quante AG, based in Germany, offers a mounting system called Flexirail which is constituted by two parallel profiles having a cross-sectional configuration which is suitable for releasably mounting telecommunications modules thereon.
EP 0 498 790 A1 discloses a modular rack for accommodating printed circuit boards. Sub-assemblies are made of horizontal rods, which are connected by side plates. Adjacent assemblies are connected by the side plates. Telecommunications modules as described above are not mountable to the disclosed structure.
WO 98/35413 describes a modular general-purpose distribution frame comprising plural hollow bodies forming a skeleton of the frame.
Finally, US 2003/0133272 A1 discloses an apparatus and method for facilitating capacity expansion of a modular frame. The apparatus comprises a housing and at least two mounting brackets, to which connection blocks can be mounted by utilizing block-mounting brackets. All of the above described racks and frames do not allow an easy change or extension of the structure thereof.
The invention provides a carrier of a distribution point in the field of telecommunications with increased versatility. Furthermore, this versatility is realized in a distribution point comprising at least one carrier provided by the invention.
The carrier of a distribution point in the field of telecommunications has a generally open, frame-like structure. The carrier can also be called a mounting structure and is intended to cover any structure or assembly, which allows telecommunications modules to be mounted thereon. The carrier can be a part of a rack, which is located in a distribution point in the field of telecommunications. In this context, a rack is considered a structure which can “stand alone”, i.e. does typically not require a further mounting structure. As mentioned, the carrier described herein can be part of such a rack. Furthermore, it is generally possible for the carrier described herein that it also stands alone and provides an integrated structure for mounting telecommunications modules thereon.
The carrier can be provided at any type of distribution point in the field of telecommunications, e.g. a main distribution frame located in the central office of the telecommunications company, any type of intermediate distribution frame, an outside distribution point such as a cabinet located at the curb side or a distribution point provided in a building, such as an office building or on a particular floor of an office building.
The frame-like, generally open structure of the carrier is realized by at least three substantially parallel bars, which are located in at least two planes. The bars can also be called rods and encompass any elongate and, as regards the cross-section, compact element. The bars can generally be seen as mounting elements, which extend in one direction, thus forming an elongated structure. For example, the cross-section of each of the bars can be profiled in a manner suitable to mount telecommunications modules thereon. Furthermore, the cross-section of the bars can be adapted to mount one or more adapters or intermediate elements thereon. These adapters and/or intermediate elements may also have an elongate shape corresponding to the general structure of the bars. In such a modification telecommunications modules can be mounted to the adapter or intermediate elements.
The at least three substantially parallel bars of the carrier can be of the same or of different cross-sections. As the bars are located in at least two planes, their cross-section can be adapted to the particular location where a particular bar is used. In this context, the at least two planes which are defined by the at least three bars can be seen in a cross-sectional view at a right angle with regard to the extension of the bars. In such a cross-section, there will be typically two bars which define a front plane. Correspondingly, typically two bars will define a backplane, which will usually be substantially parallel with the front plane. As described in more detail below, due to different types of objects, amongst others telecommunications modules, which are to be mounted to the bars, the bars of the front plane can have a cross-section which differs from that of the backplane. However, the cross-section of all bars can be identical. In this case, the manufacturing costs can be kept at a lower level due to a high degree of standardization.
To provide an integral carrier, the bars are maintained in a fixed relationship to each other. In particular, they can be directly, or indirectly connected with each other. The maintaining of the bars in a fixed relationship to each other can be realized by any suitable structure. For example, one or more plate-like elements can be used to connect the bars with each other so as to define a generally open, frame-like structure, which will then be closed at least one side by the described plate. However, the bars can also be connected with each other by further bars or rods extending substantially perpendicular to the bars, which are to be connected to each other.
Finally, at least one of the bars is adapted to mount telecommunications modules thereon. In a specific embodiment of the carrier described herein two substantially parallel bars cooperate to define a mounting structure for telecommunications modules. As mentioned above, the bars can advantageously have a constant cross-section. Instead or in addition thereto an adapter or intermediate element, which may have substantially the same length as the bar, can be attached to the bar. Advantageously, such an adapter or intermediate element also has a constant cross-section throughout. This provides enhanced flexibility for mounting telecommunications modules for the following reasons.
Firstly, the carrier having bars as described above does not define a predetermined pitch for mounting telecommunications modules. Rather, telecommunications modules can be mounted at any desired location along the bars and can particularly be moved along the bars by sliding them relative to the bars. Consequently, the capacity of the carrier is not limited by a predetermined pitch, but the carrier can be equipped with as many telecommunications modules as it can accommodate. Also in a situation when the configuration of telecommunications modules is to be changed, the carrier described herein permits great versatility. As described in more detail below, wire guides can be mounted to the carrier in addition to and preferably between telecommunications modules. If a need for wire guides arises, two adjacent telecommunications modules merely have to be moved apart from each other along the bars for a sufficient distance so as to mount wire guides in between. Furthermore, as there are different types of wire guides, one type of wire guide can be replaced for a different type of wire guide, when the need arises.
Furthermore, the carrier is flexible with regard to its length, i.e. its extension in the direction of the bars. As the size of the carrier is essentially only limited by the length of the bars used, these can be provided at any suitable or desired length. In particular, this length is in no manner dependent on a particular pitch. Rather, any length can be realized so as to provide a carrier suitable for any number of telecommunications modules and/or wire guides and/or further components. As an example, the telecommunications module disclosed in the WO 2003/061303 can be mounted to the carrier. In particular, the structure of this known telecommunications module in general, and with regard to the wire guides, can be used as a reference, which is incorporated herein, for the structures described herein. As regards the versatility, it should be emphasized that the telecommunications modules can be used without any wire guides. Further, one wire guide comprising any suitable number of wire guiding channels can be combined with a telecommunications module. Two wire guides as described above can be provided adjacent the telecommunications module on each side thereof. Furthermore, two wire guides can be arranged on the same side of a telecommunications module. Finally, plural wire guides can be arranged adjacent any desired sides of a particular telecommunications module.
It is, furthermore, beneficial for the carrier that the bars are arranged so as to define at least two planes. These planes can be used to provide defined mounting locations for specific parts of telecommunications modules or further components to be mounted thereon. As mentioned above, telecommunications modules can be directly or indirectly mounted to two bars defining a front plane. Two further bars, defining a backplane substantially parallel to the front plane, can be used to hold a printed circuit board. The printed circuit board can be provided with connectors and suitable components. For example, printed circuit boards can be connected with the connectors, on the one hand, and the telecommunications modules at their rear side, on the other hand. Thus, an assembly of plural telecommunications modules can be connected with each other in a flexible and reliable manner. These advantages are obtained by the versatile carrier having a modular structure being comprised of very few basic elements, such as the bars and those components connecting the bars with each other. Finally, that bar or those bars which is/are intended to mount telecommunications modules thereon can be constituted by a bar such as the product Flexirail offered by 3M/Quante AG, of Neuss, Germany.
Although the carrier can have any suitable number of bars in at least two planes, it is currently preferred that four bars are provided which define, in cross-section, a rectangular structure. As mentioned above, the cross-section is obtained from a section perpendicular to the extension of the bars. In the described rectangular structure two planes are provided which allow flexible mounting of different types of components such as telecommunications modules, on the one hand, and a printed circuit board, on the other hand, at different depths and/or levels.
In general, the bars can be of any cross-section and the mounting of the telecommunications modules can be adapted to allow the telecommunications modules to be mounted to bars of a certain cross-section. In particular, the bars can also have a profiled cross-section comprising suitable projections and/or undercuts for cooperating with structures like latch hooks and/or bulges of components, which are to be mounted to the bars. Telecommunications modules can be provided with suitable latch hooks. Furthermore, an adapter-bar or any other suitable intermediate element can be provided with one or more bulges cooperating with undercuts of the bars of the carrier. Thus, telecommunications modules can be directly attached to the bars. Furthermore, telecommunications modules can be indirectly attached to the bars by attaching one or more adapters to the bars, and mounting the telecommunications modules to the one or more adapters.
The bars can be maintained in a fixed relationship to each other, in particular, indirectly connected with each other by one or more plates or side walls. The plates can extend perpendicular to the direction of the bars and provide a simple and efficient connection of the bars as well as a type of closure at the sides of the carrier. Generally, the front and back as well as the top and bottom of the carrier are defined by the bars and remain open, and plates or walls are preferably used only at/as sides. The bars can, e.g. be connected with the plates by screws or clamps.
In practice, the carrier can comprise at least one adapter, which is attachable to one or more of the bars and adapted to mount telecommunications modules thereon. The adapter can have an elongate structure and be of substantially the same length as the bars. The adapter can have one or more projections or bulges which can cooperate with undercuts in the cross-section of the bars so as to allow the mounting thereof. Thus, the bar is appropriately shaped or profiled to allow the adapter to be mounted thereon. As an alternative, the adapter can have an appropriate shape or profile to allow the mounting thereof to the bar. Finally, any type of cooperating structure, both on the bar and the adapter, can be used. It should also be mentioned that there can be more than one adapter or intermediate element provided on a single bar to allow the mounting of telecommunications modules to one of the adapters or intermediate elements.
In particular, the adapter can be mounted to the bar by being slid into a profiled section of the bar, e.g. so as to accommodate the bulges and/or projections of the adapter in the undercut of the bar. The adapter can, as seen in the cross-section, provide a suitable projection or flange so as to allow telecommunications modules having latch hooks to be mounted thereon.
The carrier can comprise one or more printed circuit boards. One printed circuit board can be provided at a rear side of the carrier so as to constitute a so-called backplane. The printed circuit can be mounted directly to one or more bars. Alternatively, adapters or intermediate elements, as described above, can be used for this purpose. In the case of a backplane, the printed circuit board extends essentially parallel with the bars. This allows plural telecommunications modules, which can have integrated printed circuit boards for various purposes, to be connected with each other. In particular, portions of the telecommunications modules or the printed circuit boards thereof, can be connected with connectors, which can be provided on the printed circuit board constituting the backplane. As apparent, one or more printed circuit boards can thus be provided in an orientation substantially perpendicular to the extension of the bars. As described below, these can be guided by suitable guides. In particular, the last mentioned printed circuit boards can be used to carry splitter circuits. Splitter circuits are now widely used in ADSL-technology. This technology allows at least two different signals to be transmitted by a single line. This is achieved by transmitting the different signals at different frequencies along the same line. The signals are combined at a particular point in the telecommunications line. The combined signal is split at another point. In particular, at the subscriber side, voice and data signals, which are separate, are combined and sent to the central office via the same line. In the central office the combined signal is split. For the transmission of voice data signals to the subscriber, separate voice and data signals are combined at the central office, sent to the subscriber and split at the subscriber side. After splitting the signal, the so-called POTS (plain old telephone service) signal can be used to transmit voice. Furthermore, the remaining parts of the split signal can be used to transmit, data, for example. The splitters, which are used to split or combine the signal, can be provided by suitable circuits on printed circuit boards, which can be accommodated in the carrier, as described above.
Moreover, printed circuit boards can be used in a configuration integrated with a telecommunications module or not, to provide a switch or relay matrix which allows for test and monitoring access to the contacts of a telecommunications module as well as to lines connected therewith. Furthermore, other active electronic parts, such as a multiplexer or a DSLAM can be integrated with a telecommunications module. One or more printed circuit boards can be used in this context. In any case, a further printed circuit board defining a backplane can provide a test bus for accessing selected contacts of selected telecommunications modules. For further details of such a test and monitoring access system, reference is made to the WO 03/079599, the contents of which are incorporated herein by reference. As mentioned, the one or more printed circuit boards of the carrier can have one or more connectors to advantageously establish connections with other components, such as further printed circuit boards.
The carrier can further comprise at least one guiding element attachable to at least one of the bars. The guiding elements can be flexibly mounted to any desired and suitable location on the bars to provide a guide for a printed circuit board and/or wire guides as described below. As an alternative, one or more bars can have guiding elements integrated therewith.
Thus, the guiding element can be adapted to guide one or more printed circuit boards so that a guiding element can extend between two bars in a direction perpendicular to the bars and can comprise a suitable slit along its extension. A printed circuit board can be inserted into the slit with its edge and can thus be guided.
The guiding element can, furthermore, be adapted to guide one or more wire guides. As will be apparent to those skilled in the field of telecommunications, wire guides can be constituted by two plates between which walls are formed so as to define channel-like structures. These channels extend from one side which is defined in a particular plane, to another side defined in a plane substantially perpendicular to the first mentioned plane. Due to the preferably arch-shaped structure of the interior walls, wires can be guided from one side to a second side that is substantially perpendicular to the first side. In the carrier described herein, such wires guides can be accommodated in an orientation with the bars being substantially perpendicular to the sides of the wire guide. As described above, wire guides of different types and/or different thicknesses, (in the direction of the bars) can flexibly be mounted to the carrier. In particular, the wire guides having arch-shaped channels, can be used, for example, to guide wires from the top or the bottom of the carrier to a front side, at which telecommunications modules are mounted, the contacts of which are exposed so as to connect the wires therewith. As will be apparent to those skilled in the art, the channels can be provided with a curve in any suitable manner. In particular, they could also be quarter-circular. Turning back to the guiding elements described above, these can be provided in an orientation essentially perpendicular to the bars, so as to guide the described wire guides. A guiding element, which is adapted to guide both a printed circuit board and a wire guide, can also be provided.
In particular, the guiding element can be adapted to guide a printed circuit board and one or more cables in parallel directions. In other words, a slit, in which a printed circuit board can be guided by engagement with its edge(s), can extend in parallel to an opening and/or a passage, through which cables can be guided.
Furthermore, a guiding element, which can be adapted to guide a wire guide, can comprise at least one opening. Such an opening can advantageously be used to allow the insertion of wires into the channels of the wire guide.
Whereas the carrier described herein can, e.g. by the above-mentioned guiding elements, be prepared to be provided with wire guides, to provide the function of guiding the wire in the carrier described herein, the latter comprises at least one wire guide integrated therewith.
As will be apparent from above, a distribution point in the field of telecommunications technology can be provided with enhanced flexibility by utilizing at least one carrier in one of the above-described feature combinations and at least one telecommunications module in order to allow, eventually, the flexible connection of subscriber lines with the exchange.
Hereinafter, the invention will be described by several, non-limiting examples thereof with reference to the drawings, in which:
In one embodiment, the carrier 10, as shown in a perspective view in
In the embodiment shown, the printed circuit board 18 is mounted to the bars 12 by suitable adapters 22, each of which is connected with one of the bars 12. For the purpose of attaching the adapters 12 as well as further components, as described in more detail below, to the bars 12, each of the bars 12 has a specific profile. In particular, the profile is, in the cross-section as seen in
In the embodiment shown, the bars 12b on the right side, i.e. those bars which define a front plane, have, at their front side, i.e. the right side of
In the embodiment of
At the sides of the guiding elements 38 as seen in
This advantage can also be realized by the embodiment of
As can be taken from
Finally,
As regards the materials used, the bars 12 and plates 14 can be made of metal. The plates 14 can be made of sheet metal. The bars can be made of extruded metal, such as aluminum. The adapters 22, guiding elements 38 and wire guides 50 can be made of plastic. Furthermore, the housing of the telecommunications modules 32 can be made of plastic.
As can be seen from the foregoing, e.g. a comparison of
| Number | Date | Country | Kind |
|---|---|---|---|
| 04006532.8 | Mar 2004 | EP | regional |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/US05/06071 | 2/28/2005 | WO | 7/23/2007 |
