The invention relates to a device for covering a position for a module in a modular distribution frame that is typically used in telecommunication central office arrangements. The invention is further related to a method for providing of a module position in a modular distribution frame intended to be retrofit with a passive or active component, such as an XDSL-splitter.
Modular distribution frames, especially for telecommunications central office arrangements, are typically used to install, control and modify the wiring that, on one side, is guided to the central office from the subscriber and which goes, on the other side, to switching units, other electronic equipment such as control devices and to further central offices. The incoming wires, typically from the subscribers, and the outgoing wires have to be connected. This is generally done in modular distribution frames (MDF), which is generally achieved through the use of different types of terminal blocks. Terminal blocks are typically arranged side-by-side on frame bodies of the modular distribution frame. In the past, these terminal blocks established the direct connections, and the incoming wires were connected to them through well-known methods such as insulation displacement connectors, wire-wrap, and the like, while older methods such as soldering or screw-type connectors were practically outdated.
It has become increasingly necessary to expand the function in the modular distribution frames by adding additional components. It is common now to have so-called disconnection modules, which allow the incoming and the outgoing wires to be disconnected from each other by inserting a corresponding plug, which is of importance when, for example, line testing is necessary. Furthermore, other components are more frequently used, such as those that protect against high voltage or high current overloads, and other electronic equipment that could for example be used for the testing of telephone lines.
More recently, it became common to further integrate into such a MDF an asymmetric digital subscriber line (ADSL) or XDSL splitter, which allow the separation of the telephone signals from high data rate signals carried on the same line. ADSL-splitters separate the telephone signal (which is guided to the telephone system as plain old telephone services, or POTS) from the high data rate signals that typically are guided to a D-SLAM or other electronic component that is capable of handling the high data rate signals.
It has become increasingly common to install these splitters in the central office in order to be prepared to provide DSL service to the highest possible number of subscribers. On the other hand, the widespread installation of ADSL- or XDSL-splitters and similar components costs a significant amount of money, which made it necessary to consider how to retrofit these components into existing MDFs instead, and how to prepare MDFs for such a retrofit.
Therefore, solutions have been identified to guide the incoming and outgoing wires onto the modular distribution frames and to connect them in some way to connection points or to introduce sockets or printed circuit boards with such sockets onto which the components such as a XDSL- or ADSL-splitter can be inserted.
In one embodiment, the present invention eliminates the step of connecting the incoming and outgoing wires to any kind of connectors, such as those arranged in terminal blocks or connection modules. The wires are installed in a manner that one of their ends is installed in the usual manner at the next unit, while, within the modular distribution frame, the other ends are left unconnected. In order to allow a connection at a later stage, the wire-ends are provided with an excess length. Under current practice, wires were first installed and then subsequently connected to the terminal blocks or connection modules. During the connection process the excess length was cut off, either within the module itself or through a special tool. The invention recognizes the value in leaving the ends of the wires in the modular distribution frame. This is established for at least one pre-selected position for a module. In order to achieve this, a device for the covering of the position of the module within the modular distribution frame, having a frame-body is used. The device comprises a covering unit that can be placed onto the position. The module is designed that it can be arranged side-by-side with other modules on the frame-body and the construction of the module allows the introduction of the wires with their wire ends, which are intended to be connected to the module. The covering unit as such is designed so that it provides protection to the wires and the wire ends and to maintain the defined positions of the wires.
In one group of modules, housings are used into which components can be inserted, such as terminal blocks or passive or active components, such as ADSL- or XDSL-splitters. These housings typically contain wire guidance systems. Preferably, the wires are guided through channel systems which are placed on the sides of the housings of the modules.
In a preferred configuration, the covering unit that is the subject of the invention comprises devices for the positioning and the affixation of the wires and the wire ends. This can preferably be achieved by having a plate integrated into the covering unit, which is arranged so that upon placing the covering unit onto the position for the module, the plate projects into the housing of the module. The plate can be provided with holes and other projections, so that the wires can be passed through the holes and fixed onto the projections in a manner that this is done in a well-defined way so that the positioning and fixing of each individual wire is identified. In order to facilitate the identification, it is a preferred method to provide the covering unit with an indicator for the identification of the wires.
As an alternative, the covering unit has essentially the form of a lid, which is fixed onto the module housing. In this case, the wires and the wire ends are not fixed onto projections or the like, but simply placed within the module housing. This may be advantageous, if the number of wires is relatively small or their length is relatively short so that a lack of a special projection or the like would not create a problem when retro-fitting the system, as long as defined positionings of the wires are obtained.
Furthermore, the covering unit can be provided with snapping device which, upon the placement of the covering unit onto the module housing, the covering device snaps directly onto it, thus providing the necessary protection for the wires and simultaneously providing a defined positioning of the wire-ends.
In another group of devices, it is common to mount the terminal blocks directly onto the frame-body of the modular distribution frame. In this case, it is preferable to leave the desired position to be retrofit open and to attach a specially designed covering unit, which preferably is provided with devices for the positioning and fixing of the wires and wire-ends and snapping devices, which allows the covering unit to directly snap onto the frame-body. In some cases, the passive or active components to be introduced into the housing module may have provisions where at least some of the wires are brought in connection with the component through the use of plugs. This can for example be of interest in the case that specific configurations of ADSL- or XDSL-Splitters are used. In such a case, the wire ends are already connected to plugs. These plugs can either allow a connection to a single wire or to a multiplicity of wires. Furthermore, the plugs are typically provided with receptacles or pins, which are designed so that they can engage with the corresponding pins or receptacles of the active or passive components. These receptacles or pins can be arranged on the lateral side of the plugs, so that between the pins or receptacles of the active or passive components and the wire an angle of about 90 degrees is obtained, or they can be arranged at the distal ends of the plugs. The application of these plugs then typically ensures a clear positioning of the individual wires and wire ends. Therefore, the configuration is particularly advantageous when the covering unit consists of a lid only.
The invention further provides a method for the generation of a module position in a telecommunication modular distribution frame, the position being intended to be retrofit with a passive or active component. The method comprising the steps of
arranging a multiplicity of modules with housings on the frame-body of a modular distribution frame, the housings allowing to introduce wires having wire-ends that are intended to be connected to the passive or active component to be introduced into the modules,
in at least one of the module housings inserting a multiplicity of wire-ends that are intended to be connected to the passive or active component to be introduced into the module, and
arranging of the wire-ends within the modules in pre-defined positions allowing the maintenance of defined positions of the wires and their connection to the passive or active component.
It would be the most straightforward way to introduce the wires into the modules and leave the ends within the openings of the housing. In a more preferred mode, the method further comprises the step of placing a covering unit as described above onto the housing. In a more preferred mode, it is possible to fix the wires onto the covering unit by positioning and affixation devices described above.
Alternatively, at least some of the wire ends may be connected to plugs that may be connected to the active or passive component.
The same method can also be used for the alternative group of modules, where in a preferred mode, the covering unit is directly placed onto the frame-body of the modular distribution frame.
When it is desired to retrofit the position with an active or passive component like an ADSL- or XDSL-splitter, an electronic component for testing or any other electronic unit, it is simply possible to remove the covering unit, which, in a preferred configuration, is snapped onto the module or the frame-body and to pull the covering unit out of the modular distribution frame, so that the individual wires can be moved out. The component to be installed is then inserted into the opening of the housing or directly onto the frame-body of the modular distribution frame and subsequently the wires are connected to it in the usual manner by either removing them individually from the affixation devices of the covering unit or if the length is sufficiently large, to leave them on the covering unit and to establish the connection directly, subsequently cutting the excess length off. When this is done with all wires, the covering unit, eventually together with the excess lengths of the wires, can then be simply be removed and either discarded or re-used for another installation.
The present invention will be described with reference to the attached Figures, in which:
In one group of modules that are mounted onto modular distribution frames, module housings are used, which are at least open and accessible from the side onto which the connections of the wires are made and which typically also include wire guidance systems. One type of these configurations is shown in
The module housings 12, 14 up to 16 are further provided on their lower end with snapping devices 42, 44, which snap directly onto rails 46, 48, which form a part of the modular distribution system. The details of these rails are not shown. They form an integral part of a mechanical support system, as is well-known in the art.
The module housings described above, and especially the wire guidance channel systems, are only one example of wire guidance systems provided in or on the housings. Other arrangements are also possible, and accordingly the invention is not limited to the specific configuration shown in
A terminal block 50 in form of a disconnection module has been inserted into the upper opening 30 of module housing 12. The details of this terminal block are generally known and therefore not referred to in detail. They typically contain two rows 52, 54 of connection units which in this case are insulation displacement contacts. The terminal block contains an area 56 projecting into the opening 30 of housing module 12, which, for example, can contain disconnection contacts. This means that the connection between corresponding contacts in the rows 52, 54 can be disconnected by placing a plastic plug between the rows as it is generally known. In a typical application, wires are inserted into the wire guidance channel system, entering in the entrance opening 26 on the side 28, exiting on the opening 34 on the side 30, being connected to the contact in the contact row 52 with an appropriate tool. Typically the excess length of the wire is cut off either in the contact itself or through a special tool.
In this particular configuration, the side portions of the frame-body are provided with rectangular openings 148, which allow one to snap on a variety of components to be assembled onto the modular distribution frame. In this particular case, a terminal block 150 is arranged on the backside. In front of it, an alternative embodiment of a covering unit 152 is placed. It is provided with a main covering plate 154 and an additional plate 156 for the guidance and affixation of the wires, which is perpendicularly arranged with respect to the main plate 154. This wire fixing plate 156 is provided with four holes, 158, 160, 162, 164 and wire affixing devices 166, 168, 170. Furthermore, the covering unit 152 is provided with snapping devices 172, 174 that can snap into any of the rectangular openings 148 of the lateral parts 142, 144 of the frame-body of the modular distribution frame 138. It should be noted that in this particular configuration no wire guidance channel systems or the like are used, due to the relatively small distance between the lower part close to the bottom plate 146 of the frame-body 140. Therefore, in a typical configuration the components are placed side-by-side and snapped onto the frame-bodies through the rectangular openings 148 in a manner that sufficient space is provided between two adjacent components so that wires can pass through them in order to be easily affixed to the individual components. In a typical configuration the wires are coming from the lower part and pass between two components to the upper part of, connecting a component such as a terminal block 150 onto which they are connected in a well-known manner.
In this particular case four wires 176, 178180, 182 are shown, which are guided on the lower portion of the frame-body near its bottom component 146. They are then guided through holes 158, 160, 162, 164 of the plate 156 of the covering unit 152 in a manner that is in principle similar to the one shown in
Furthermore, wire 72 with wire end 74 and plug 201 as shown can be considered as a cross-sectional view, which means that wire 72 with wire end 74 could also represent two or more wires arranged in parallel, where these wires are then connected to a single plug having two or more positions.
Plugs of this kind are used whenever this appears to be advantageous with respect to the passive or active component to be inserted into module housing 12. The use of additional plugs 201 being either individual plugs or plugs with several wires leads to defined positions of the wires. Therefore, in this case additional provisions for the fixation of the wires are not necessarily required.
It should be noted that the examples shown here do not limit the invention. The multiplicity of alternative embodiments can be thought of, following the same principles as indicated.
This application claims priority to Provisional Application No. 60/383,185 filed May 23, 2002.
Number | Date | Country | |
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60383185 | May 2002 | US |