GB2410383A - Protecting jacks during installation in a building - Google Patents

Abstract

A structured cabling system comprises a plurality of data cables (6A-6F), one end of each cable being secured to a jack of a multiple jack assembly (1) and the other end of each cable being secured to an individual jack (9A-9F) located within a protective enclosure (11). The individual cables are mechanically secured to at least the protective enclosure (11) and/or a strain relief member (8) within the cable bundle is secured to the protective enclosure (11). The entire assembly may be pre-formed under factory conditions and delivered to an installation site. The multiple jack assembly (1) may then be secured, preferably by snap-fitting, to a rack assembly and the protective enclosure (10) may be used to draw the entire cable length to the required position. Once the cable is in position the protective enclosure (10) is discarded and the jack secured to their final use positions. In an alternative embodiment the protective enclosure forms a housing for the jacks (9A-9F) in their final use position and may, for example, be snap-fitted to a floor box for this purpose. The claims also embrace a structured cabling system without a protective enclosure.

Description

STRUCTURED CABLING SYSTEM AND METHOD

This invention relates to a structured cabling system and to a structured cabling method for installing structured cabling into a building.

Structured cabling systems for distribution of voice and data infonnation around a building are well known. Typically, a Category 5 ("Cat 5") or Category 5e ("Cat 5e") system will comprise one or more rack mounted patch panels, each having a plurality of RJ45 jackets. Each jack of each patch panel will have connected thereto a length of data cable. Each length of data cable, at the end remote from the patch panel, will have connected thereto a jack which is typically mounted in a floor box or wall outlet.

Conventionally, installation of a structured cabling system as described above is carried out by first running lengths of cable, cut frown reels of cable, between each position where a floor or wall outlets is required, and a corneas rootn. The cables are temporarily labeled for identification purposes. Cable installation is typically carried out at an early stage of building fit-out and can be done by unskilled staff. At a late stage in the fit-out, a rack system is installed in the comms room. The cable ends in the cornms room are cut to length and each cable is tenninated to the correct jack on a patch panel, taking account ofthe cable labeling previously provided. The far end of each cable is then terminated to a jack in a floor or wall box and each cable and its connections is tested. Any faults are rectified and the patch panels are then fixed to the rack.

The existing method of installing structured cabling, as outlined above, has a number of well recognized disadvantages. Notably, termination of the cable to the patch panel and remote jack is somewhat problematic under site conditions. Skilled personnel are required to make the necessary terminations reliably and if the terminations do not meet the test standard, re-tennination is required. The time required on site to install the structured cabling system is considerable resulting in general inconvenience and cost. On-site testing is difficult and time consuming. These problems are significant when the installation is to Cat 5 or Cat 5e standards.

However, the problem becomes considerably worse if the installation is to Category 6 ("Cat 6") standard or is a fibre optic installation because ofthe greater difficulties in obtaining the required quality of termination under site conditions for these systems.

We have now devised an arrangement which overcomes many of the difficulties and shortcomings outlined above. The preferred embodiment ofthe present invention provides a structured cabling system in which all the required termination and testing is carried out under factory conditions. Forming terminations to the required standard under factory conditions is substantially easier than attempting to carry out termination to the required standard under site conditions. Further, performance testing carried out under factory conditions is considerably quicker and more accurate than is possible using field equipment. If any rectification is required this is easier to carry out under factory conditions than under field conditions. On site installation is considerably quicker and can be carried out by unskilled or semi skilled personnel.

In accordance with a first aspect of the present invention a structured cabling system comprises: a plurality of cables each terminated to a multiple jack assembly which includes an individual jack for each of the data cables, an individual jack tenninated to each data cable at the end thereof rennote frown the jack nodule; and a protective enclosure surrounding the terminations to the individual jacks to protect them from accidental damage during installation.

In one embodiment of the invention the protective enclosure and/or the multiple jack assembly is collected to the cables by a mechanical comection which permits the cables to be pulled by pulling the protective enclosure or multiple jack assembly, as the case may be.

In one embodiment of the invention, the data cables are laid around a strain relief member to form a composite cable. With such an arrangement a complete assembly comprising the multiple jack assembly, the data cables, the individual jacks and the protective enclosure may be assembled under factory conditions and transported as a unit to a site. At the site, the multiple jack assembly may be secured to a rack and the protective enclosure used to draw the cable through the building to a position adjacent the required position of the individual jacks. The protective enclosure may then be removed and the individual data cables unlaid to provide for the necessary positioning of the individual jacks in their wall mounted or floor amounted outlets. In the alternative the individual jacks may be mounted to a single outlet structure, for example a single floor box. In one embodiment of the invention the protective enclosure is not removed at the end of the installation procedure, but rather remains in place to protect the terminations to the individual jacks. Under these circumstances, the individual jacks and the protective enclosure may together be secured as by snap fitting to a purpose designed wall or floor box to provide a plurality of adjacent individual jacks. The entire operation may be completed without affecting the termination ofthe data cables and without applying mechanical strain to the connections.

If a strain reliefmember is employed it may also be anchored to the body ofthe multiple jack assembly. If this is done, the cable may be drawn in the opposition direction - i.e. front the wall or floor outlet to the comms room by applying a drawing force to the multiple jack assembly.

Preferably, a housing is provided for receiving a plurality of multiple jack assemblies, the arrangement being such that when multiple jack assemblies are in position the resultant combination of housing and multiple jack assemblies has an appearance similar to that of a conventional rack-mounted patch panel. Preferably, the multiple jack assemblies snapshot into the housing and can easily be released from the housing, for example by depressing a release latch. Preferably, the multiple jack assemblies comprise an enclosure which encloses the jacks and termination fittings and is secured to the composite cable to ensure strain relief.

In a particularly preferred arrangement the multiple jack assemblies are connected to the housing by offering up multiple jack assemblies to the rear of the housing and clipping them in position. Accordingly, it is not necessary to feed the individual jacks, the protective enclosure or the data cable through the rack-mounted housing.

In one embodiment of the invention both ends of the cable assembly are terminated in a multiple jack assembly. The multiple jack assemblies may be identical to each other. With such an arrangement the multiple jack assemblies may be snapped into position into carriers in respective rack assemblies so as to provide interconnected patch panels which may be within the same or different conuns rooms or cabinets.

The invention will be better understood from the following description of a preferred ennbodinent thereof, given by way of example only, reference being had to the accompanying drawing wherein: Figure I illustrates in perspective a multiple jack assembly having a plurality of data cables connected thereto, one part of the assembly casing being removed in the interests of clarity; Figure 2 shows a plurality of individual jacks connected to a composite data cable and mounted within the base of a protective enclosure, the top of the protective enclosure being omitted in the interests of clarity; Figure 3 illustrates a clip for use in connection with the system of the present invention; Figure 4 shows a multiple jack assembly mounted in a housing; Figure 5 is a cross-section along the line X-X of Figure 4; Figure 6 shows an alternative arrangement for the end of the cabling system remote from the multiple jack assembly; and Figure 7 illustrates a Corneas cabinet for use with the arrangements for Figures 1 -6.

Referring firstly to Figure I there is illustrated a multiple jack assembly 1 comprising six individual jacks 2A-2F. Each jack is mounted on a PCB 3 and is provided with a respective IDC connector 4. The jacks and PCB are mounted within a casing 5, only the base of which is shown in Figure 1. In use, the casing 5 will also include a cover which is a snapfit with the base so as to enclose the jacks, the PCB and the IDC connectors. The snap-fit between the base and the cover of the casing may grip the individual data cables 6A-6F to provide strain relief. Alternatively the individual cable may be clamped to the base by suitable clamping means. Six data cables 6A-6F are terminated to respective IDC connectors of the jacks 2A-2F to the standard required (typically Cat 5, Cat 5e or Cat 6) by the installation in question. The termination, and the securing of the casing cover to the casing base are completed under factory conditions.

Referring now to Figure 2, the end regions of the data cables 6A-6F remote from that illustrated in leisure 1 is shown. It will be noted that the individual cables are fonned into the composite cable 7 which preferably in addition to the individual cables 6A-6F includes a central strain reliefelement 8. The individual data cables 6A- 6F are respectively terminated to individual jacks 9A-9F via associated IDC connectors. The individual jacks are located and optionally temporarily secured within the base l O of a protective enclosure 1 1. The composite cable 7 is secured to the base by means of a clamp 12 to ensure stress relief. Additionally or alternatively the strain relief element 8 may be secured to the base l O of the protective enclosure to provide strain relief. This claim relief element 8 may optionally be secured to the casing 5 of the possible jack assembly l to provide strain relief at that point.

In use, the protective enclosure 1 1 would be closed by means of a cover which forms a snap-fit with the base 10. The enclosure protects the individual jacks 9A-9F and allows strain to be applied to the composite cable without applying strain to the terminations ofthe individual cables to the IDC connectors. Preferably, a pulling eye 12 is fonned in the protective enclosure to allow a pulling rope to be attached to the protective enclosure. Alternatively, if appropriate strain relief is provided at the multiple jack assembly end a pulling rope may be attached to the multiple jack assembly to enable the multiple jack assembly to be pulled towards its eventual location.

The exact point at which the individual data cables 6A-6F are fanned into the composite cable 7 will depend on the nature of the data installation in question.

However, over the majority of the distance between the multiple jack assembly 1 and the protective enclosure 11 the cables will be in the forth of a single composite cable to facilitate easy handling of the complete assembly. In some instances, the act of laying the individual cables will form a composite cable of the required structural integrity. However, in general it is envisaged that some means would be provided for holding the composite cable in its composite fond. Such means nay, for example include over-wrapping of the cable with a suitable film material. The means used for holding the cable into its composite fond will be chosen having due regard to the need to be able to bend the composite cable without imposing undue strain on any one individual cable within the composite.

Termination of the individual data cables to the individual jacks 9A-9F, and subsequent testing, is accomplished under factory conditions.

Once a complete cabling assembly comprising multiple jack assembly, data cables, individual jacks and protective enclosure has been fonned and tested under factory conditions it will be transported to site. To this end, a carrier is preferably provided. The carrier preferably includes a drum for receiving the data cables and means for accommodating and holding the multiple jack assembly and the protective enclosure. Several complete cable assemblies may be mounted on the same delivery device depending on their length. The carrier is transported to site by any suitable means, for example road transport, and is taken to the general area where the structured cabling installation is required. In general, a rack arrangement will be provided in a comms room or cabinet. In the case of the preferred embodiment of the present invention the rack is provided with a plurality of individual housings 13 (Figure 4) into each of which several multiple jack assemblies can be mounted. The required mounting is preferably obtained by offering the multiple jack assembly I up to the rear of the housing 13. In the preferred embodiment of the invention a plastics adaptor l 4 which may incorporate labeling facilities 15 is offered up to the housing 13 from the front thereof, and the multiple jack assembly l is then pushed into snap-fit engagement with the adaptor 14 from the rear of the housing. This arrangement is illustrated in Figure 5. A release lever 37 is provided which will enable the multiple jack assembly to be released frown its associated housing by sliding the release lever to disengage the snap-fit latches 38. The fact that the multiple jack assembly can be offered up to the housing 13 from the rear thereof, combined with the above described latching arrangement, and the sliding release lever, greatly assist installation and removal ofthe multiple jack assembly from the concerns cabinet. It will be appreciated that in a complete structured cabling installation many cables will be located within the comms cabinet and the facility easily to insert and release an individual multiple jack assembly from the rear is of considerable value. The latch 3 8 and sliding release lever 37 arrangement may, in fact, be of general utility in applications other than the structured cabling assembly described herein.

Having snap-fitted a multiple jack assembly 1 into the correct position in the associated housing 13, the data cables are guided through the connunication enclosure by conventional means or by use of special purpose clips] 6 as illustrated in Figure 3. The remainder ofthe cable assembly, including the individual jacks 9A-9F is then hauled through the building structure to a point adjacent to the required final position of the jacks (9A-9F). The protective enclosure is then removed and the individual data cables unlaid from the composite cable to bring the jacks to their required final position. The jacks will then be snap-fitted into appropriate mountings in floor or wall boxes.

It will be appreciated that the entire data installation process, as outlined above, can be effected on site without disturbing the terminations between the data cables and their associated jacks. Further, no on-site testing of the completed installation is necessary.

Although in general it wild be desirable to start the cable laying exercise from the corms cabinet/conns room by installing the multiple jack assembly to its associated housing and then laying the cable to the required position, it is to be understood that under certain circumstances it may be desirable to start the cable laying exercise at the individual jack end of the assembly and lay the cable to the comms cabinet/comma room where the multiple jack assembly is secured in position.

In one embodiment of the invention the data cables are provided in pairs connected together on a common line in a generally "8" shaped crosssectional an-angenent. In order to provide the six cables of the illustrated embodiment of the invention three such double "8" cables are laid around the strain reliefmenber S. The resultant bundle may be secured together by any appropriate means, for example adhesive bonding or binding. In the case of a six cable arrangement as illustrated the three different "8" shaped cable pairs may be of different colours. One data cable of each pair preferably includes an appropriate indicator, for example a continuous or near continuous line of printed text. By this means, each individual jack 9 can readily be associated with a particular one ofthe jacks ofthe multiple jack assembly by visual inspection.

In an alternative embodiment of the invention six individual cables are laid about a central strain relief member. The individual cables can be of any suitable type. Preferably, the cables are provided with end-to-end identification means, for example in the fond of a continuous printed legend on each cable or in the form of coloured or raised identification strips or bumps. This will assist in identifying which jack of the multiple jack assembly is connected to which of the individual jacks at the remote end ofthe cable assembly. However, use of identifying characteristics on the cables is not essential if all termination is carried out under factory conditions.

Preferably, each of the jacks has associated therewith indicia which may be used to identify which of the jacks at the multiple jack assembly is connected to which of the jacks at the remote end of the structured cable assembly. The indicia may be in the form of a labeling system. Preferably, the label or labels of the multiple jack assembly are visible frown the rear of the assembly so that they can be viewed frown the rear of the comms cabinet.

In some applications, for example those using Cat 6 cable, it may be desirable to position the individual cables within the bundle to reduce alien cross-talk. For example, it may be desirable to lay the cables in an A-B, A-B, A-B sequence around the strain relief member.

Referring now to Figure 6 an alternative arrangement for the end of the structured cabling system remote frown the multiple jack assembly is shown. The arrangement shown in Figure 6 may be used instead of the arrangement shown in Figure 2. In the Figure 6 arrangement, six individual jacks 20A-20F are respectively connected using conventional IDC connectors to respective data cables 21A-21F which are laid about a strain relief element 22. The data cables 21A-21F and strain relief element 22 together form a composite cable 23. The individual jacks 20A- 20F are mounted on a protective enclosure 24, which protects the terminations of the data cables 21A-21F to the respective jacks 20A-20F. The protective enclosure 24 is mechanically secured by a suitable clamp 25 to the composite cable 23. Preferably the strain relief element 22 is secured directly to the protective enclosure 24. As a result, a pulling force may be exerted on the cable 23 by grasping the protective housing 24 and pulling. The individual connections between the data cables 21-21F and the individual jacks 20A-20F are isolated front such pulling forces by virtue of the connection between the strain relief element 22 and the protective enclosure 24 and by virtue of the clamp 25. With the arrangement of Figure 6, when the cabling system has been run to the correct position the jacks 20A-20F and the protective enclosure 24 are snap fitted, as a unit, into a suitable housing, for example a suitable floor box. To this end, snap-fit latches 26 are preferably provided as part of the individual jacklprotective enclosure assembly.

In an alternative embodiment, (not shown) the ends ofthe cables remote from the multiple jack assembly are not tenninated to jacks. Accordingly, the structured cabling system as supplied comprises a plurality of cables each terminated to a multiple jack assembly, the cables being bundled with a strain element to enable the bundled cable to be drawn into the required position. With such an arrangement, individual termination is necessary on site, but such termination is restricted to the ends of the data cable remote from the Corms cabinet or room.

In yet a further alternative embodiment both ends ofthe cable are terminated in multiple jack assemblies each substantially identical to the other. Both multiple jack assemblies are preferably of the fond illustrated in Figure 1. With such an arrangement, both multiple jack assemblies will be secured to respective housings either within the saline rack structure or within different rack structures, possibly in different comms rooms. Such an arrangement will allow very rapid establishment of data connections between rack systems.

It is envisaged that, in many instances, each cable assembly will be manufactured to a specific length determined by the particular installation. Such specific lengths may be identified by site survey or from scaled plans ofthe proposed installation site. It is envisaged, however, that cable assemblies may be manufactured in a range of predetermined standard lengths. It is expected that manufacture of assemblies to predetermined standard lengths will be somewhat more economic than individual manufacture to specific lengths and in the circumstances where standard length cables may be utilized for a particular installation this may provide a more economic solution to the installation problem than the use of individually manufactured cables.

Referring now to Figure 7, there is shown a schematic view or pert of a Contains cabinet suitable for use with the system described above. For the purposes of illustration only two multiple jack assemblies 1 are illustrated mounted on respective housings 13. It will be appreciated that, in a typical installation, there will be a large number of housings 13 each of which will accommodate several multiple jack assemblies. The illustrated Corms cabinet 3() comprises, in addition, a plurality of wire grids 31. Only one such grid 3] is illustrated in Figure 7, but it will be appreciated that, in general, both sides 32,33 of the Corms cabinet will be furnished with such grids. In addition, intermediate grids may be located in a central region of the cabinet. The grids 3] provide a convenient means for locating the data cables 34 of the structured cabling system illustrated. To this end, purpose designed clips 35 may be secured to the grids (eg by snap fitting) and provide clip structures for receiving the data cables 34. Conveniently, each clip 35 may include one or snore clipping areas each of which is adapted to receive the data cables of one structured cabling system. Using such a grid and clip arrangement cable management within the comms cabinet 30 may quickly and easily be effected. If additional local restraint of cables within the comms cabinet is required, or if the comrns cabinet is intended to include cabling other than the structured cabling system described above, the grids 31 provide a convenient means whereby cables may be secured by means of clips or cable ties.

Whilst the invention has been described with particular reference to copper cabled arrangements it will be appreciated that the principles ofthe present invention may be applied to optical fibre arrangements if an optical fibre system is required.

Cross reference is hereby made to British Patent Application No. 0328740. 6, publication no. GB 2398437, from which the present case has been divided. ]1

Claims (18)

1. CLAIMS: 1. A structured cabling system comprising a plurality of data

   cables each terminated at a first end to a multiple jack assembly which includes an individual jack for each of the data cables; the end of each data cable remote from said first end, in use, being terminated to an individual jack.
2. 2. A structured cabling system according to claim 1, wherein each said remote end of said data cable is tenninated to an individual jack, said system further including a protective enclave surrounding the terminations to the individual jacks to protect them from associated damage during installation.
3. 3. A structured cabling system according to claim 2, wherein the assembly of data cables is connected to the protective enclosure by a mechanical connection which pennits the cable to be pulled by pulling the protective enclosure without imposing strain on the electrical comections between the individual data cables and the individual jacks.
4. 4. A structured cabling system according to claim 2 or claim 3, including a strain relief element mechanically secured to the protective enclosure and/or the multiple jack assembly housing.
5. 5. A structured cabling system according to any of claims 2 to 4, wherein the protective enclosure provides a mounting for the individual jacks in their final use configuration.
6. 6. A structured cabling system according to claim 5, including latch means on the protective enclosure to enable it to be snap-fined into engagement with a floor or wal box.
7. 7. A structured cabling system according to any of claims 2 to 6, wherein the protective enclosure is a further multiple jack assembly substantially identical to the first multiple jack assembly.
8. S. A structured cabling system according to any ofthe preceding claims, wherein the assembly of data cables is connected to the housing of the multiple jack assembly by a mechanical connection which pennits the cable to be pulled by pulling the housing of the multiple jack assembly without imposing strain on the electrical connections between the individual data cables and the jacks of the multiple jack assembly.
9. 9. A structured cabling system according to any preceding claim comprising means for securing the multiple jack assembly to a housing.
10. 10. A structured cabling system according to claim 9, wherein said securing means comprise snap-fit means.
11. 1 1. A structured cabling system according to claim 10, wherein said snapfit means are releasable to release the multiple jack assembly from the housing.
12. 12. A structured cabling system according to any of claims 9 to 11, wherein the securing means comprises an adaptor which is push-fitted into the housing from the front thereof and which includes means for interengaging with fastening means on the multiple jack assembly for securing multiple jack assembly to the housing.
13. 13. A structured cabling system according to claim 12, wherein the interengaging means comprises releasable snap-fit latches.
14. 14. A method of installing a structured cabling installation comprising: pre-forming in a factory environment a plurality of structured cabling systems according to any preceding claim; transporting the pre-fonned structured cabling systems to the site of the required structured cabling installation; installing each structured cabling system so that the multiple jack assembly thereof is located at a first desired location and the remote end thereof of each data cable is located at a second desired location; securing the multiple jack assembly to a rack; and securing the remote end of each data cable to their required final use position.
15. ] 5. A method according to claim 14, comprising the further step ofterminating the remote end of each data cable with an individual jack prioir to securing the required final use positon.
16. 16. A method according to claim 1>, wherin the step of securing each multiple jack assembly to a housing comprises offering up the multiple jack assembly from the rear of the housing and securing it to the housing.
17. 17. A method according to claim 16, wherein the step of securing the multiple jack assembly to the housing comprises securing the multiple jack assembly by means of snap-fit connectors.
18. 18. A method according to claim 17, wherin said snap-fit connectors are releasable snap-fit collectors.