NZ241536A - Mounting unit for a main distribution frame structure - Google Patents

Description

New Zealand No. 241536 International No. PCT/ TO BE ENTERED AFTER ACCEPTANCE AND PUBLICATION Priority dates: 05.10,1988; Complete Specification Filed: 05.10.1989 Classification:^) H02G15/076; H04Q1/14 Publication date: 24 February 1998 Journal No.: 1425 NEW ZEALAND PATENTS ACT 1953 COMPLETE SPECIFICATION Title of Invention: MOUNTING UNIT FOR A MAIN DISTRIBUTION FRAME STRUCTURE Name, address and nationality of applicant(s) as in international application form: TELSTRA CORPORATION LIMITED, an Australian company of 199 William Street, Melbourne, Victoria 3000, Australia 24 1 5 36 SP4NVI "2J61 y 9 « -•ttay w> «B0|8?MUi} «£ No.: , CHANGE oPftfcMr. Q," APPLICANT ^\t\Grp NEW ZEALAND PATENTS ACT, 1953 COMPLETE SPECIFICATION MOUNTING UNIT FOR A MAIN DISTRIBUTION FRAME STRUCTURE p\r>CKvS divided out of appln. No. 23 0918 dated 5 October 1989 NXPATENTOFF£.K_ 1 | -5FiB^52 '« .

[ RECEIVED victi Wc. AUSTRALIAN TELECOMMUNICATIONS CORPORATION, a body corporate established under the Telecommunications Act 1975, of 199 William Street, Melbourne, 3000, in the State of Victoria, Commonwealth of Australia hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: - (followed by page la) 24 1 5 - la - This invention relates to a mounting unit for a main distribution frame structure.

In telephone exchanges it is customary to provide a main distribution frame, by which is meant a structure upon which is mounted connector devices of two kinds, one kind being connected to what is usually called "external plant" meaning cabling, for example in the street, and intended to go to exchange customers' equipment such as telephones and to junction cables between exchanges, the second kind connecting to what is termed "internal equipment" or "internal plant" by which is meant cabling to active devices within the telephone exchange, particularly switching equipment. The 24 15 36 % cabling associated with the two kinds of connector device is terminated at those connector devices and conductors, called "jumper leads" are then interconnected between connectors of the two kinds as required in order to provide desired coupling between the customers' cabling and the cabling to the active devices in the exchange. As new customers are added to the exchange, further switching equipment or the like is required in the exchange and the number of cables to the connectors of both kinds increases, as does the number of jumper leads. Furthermore, from time to time it may be r.ecessary to alter connections between selected ones of the connector devices, which involves replacement of the jumper leads. In any event, the end result is that in an exchange which has been operating for some time and which is servicing numerous customers, the number of jumper leads may increase to such an extent that adding new connections by adding new jumper leads or altering existing interconnections becomes extremely difficult. Large exchanges may service tens of thousands of customers and particularly if there is no pre-ordered arrangement of the connector devices, the density of jumper leads may be very high indeed, thus seriously interfering with accessibility. By adopting arrangements where order is maintained in that recjard, the problem can be lessened, although not completely overcome. By positioning the devices of the two kinds such as to ensure that jumper lead length is minimised, the system is said to have preferred assignment. A system where all jumper connections run between preferred points is termed "100 percent preferential assignment" and such an 24 1536 arrangement is generally more efficient, but requires a greater degree of management. It is however not necessary nor practically desirable to employ 100% preferential assignment for technical reasons, but it is desirable if possible to employ ar-rangements utilizing rather high preferential assignment values, in the interests of containing the problems caused by presence of large numbers of jumper leads.

Most of main distribution frame research has been targetted towards structures which are, operationally, similar to a honeycomb in the sense that they may be considered to comprise a large storage system made up of a number of individual storage cells arranged in an array. Generally, a conventional main distribution frame may be compared to one very large storage tank in which there is no restriction on the possible jumper connections. On the other hand, in an ideal main distribution frame, % the jumpering is contained within an individual cell (or neighbourhood at least) of the main distribution frame. In particular, while it may not be possible to fully achieve an arrangement in which there is no jumpering in between cells, it is at least, in the ideal case, desired to achieve an arrangement where, in the event that such jumpering does exist, it is heavily restricted in the sense that interconnections between cells are, insofar as possible, between closely adjacent cells with relatively few long jumpers between relatively distant cells. A particular defect with prior art arrangements lies in that it is difficult to provide in certain of them, the preferred assignment in this 241536 % % fashion and furthermore, in that some forms have unsatisfactory provision for supporting long jumpers where these are necessary.

Whatever system is employed, there is ultimately a practical limit to how many connector devices can be positioned on a single main distribution frame, in terms of the possible number of jumper leads which can in any event be physically packed into spaces within the frame. For example, in Australian practice it has been customary to position connector devices of one of the aforementioned kinds in a vertical array at one side of the frame and the devices of the other kind in a vertical array at the other side thereof so that, essentially, the jumper leads are provided to interconnect between opposite sides of the frame. Other countries have similar main distribution frame practices. Obviously, there is a lirait to the., number of leads which can be so accommodated in the space between the two sides.

Other problems arise from cable congestion above the main distribution frame or at the entry vault or cable tunnel in which the incoming cables enter the exchange. In some cases, notwithstanding that the cable entry tunnel is of much greater physical capacity than is needed to accommodate the number of cables therein, constraints due to the manner in which the cables are to be terminated at the main distribution frame bring the result that the congestion between the main distribution frame and the vault becomes so great that less than the whole capacity of the vault is usable. Similar 241536 problems can arise where termination to the main distribution frame occurs from locations above the frame.

Another difficulty with conventional main distribution frames lies in the lack of flexibility of design of the support structure of the frame, which places constraints on the layout and expandability of the main distribution frame. This results in a reduction in maximum usable capacity, and inefficient operating practices.

. It is desirable to provide a mounting structure for connector devices of a main distribution frame and which can be arranged or rearranged to provide good accessibility between connector devices of the above mentioned two kinds and which can readily be adapted to provide a main distribution frame of desired size, capacity or configuration.

It is an object of the invention to provide a mounting unit incorporatable into such a structure. 24 1 536 Accordingly the invention provides a modular mounting unit for mounting at least one connector devicc to a main distribution frame, said main distribution frame including generally upright parallel support members arranged to define a first plane and said connector device having an elongate electrically insulative body including rows of electrically conductive terminals extending along the length of said body and positioned at one generally planar face of said body, said modular mounting unit comprising: first and second mounting components detachably fixable to respective ones of said support members; and at least one elongate mounting element defining a second plane substantially parallel, in use, to said first plane, said mounting element including means for mounting said at least one connector device thereto so said planar face defines a third plane substantially parallel to said first and second planes such that said second plane is disposed between said first and third planes.

A distribution frame structure as herein described is claimed in New Zealand specification No. 230918 from which the present specification has been divided.

The invention is further described by way of example only with reference to the accompanying drawings in which: 24 1 5 36 * % % Figure 1 is a perspective view of part of a main distribution frame structure constructed in accordance with the invention; Figure 2 is a perspective view of a mounting unit incorporated into the main distribution frame structure of Figure 1; Figure 3 is a perspective view of another form of mounting unit incorporated into the main distribution frame structure of Figure 1; Figure 4 is an enlarged fragmentary view illustrating the positioning of mounting members of a mounting unit and upright supports of the main distribution frame structure of Figure 1; Figure 5 is an enlarged cross sectional view illustrating the manner of interconnection between upright support members and mounting units forming part of the main distribution frame structure of Figure 1; Figure 6 is a perspective view illustrating the interconnection of connector devices fixable to the main distribution Jframe structure of Figure 1 to form a main distribution frame; Figures 7 and 8 are transverse sections of a mounting element/ forming part of the mounting unit of Figure 2, illustrating the manner of attachment of a connector device thereto; Figure 9 is a perspective view of a main * % % 24 15 36 distribution frame constructed in accordance with the invention and illustrating allocation of connector devices as between external and internal plant; and - Figure 10 is a diagrammatic end view of a main distribution frame constructed in accordance with the invention.

Referring firstly to Figure 1, the main distribution frame structure 10 shown therein includes first and second sets 12, 14 of upright support members 16. The support members 16 in set 12 are parallel to each other and arranged in a single vertical plane. Those in set 14 are likewise parallel and arranged in a single vertical plane parallel to the plane containing support members of set 12. The two planes are spaced apart, a distance of, for example, 300mm. As shown, the support members 16 in set 12 are secured to and extend upwardly from a lengthwise extending horizontal base member 18 and those in set 14 similarly extend from and are fixed to a horizontal base member 18 parallel to the first mentioned base member.

Support members 16 in each of the sets are interconnected in various ways to form a rigid upright structure, such as by interconnection of upper ends thereof by transverse members 20 and interconnection between members 16 in the two planes containing the sets 12, 14 by use of lengthwise extending trays 22. The structure 10 may be secured together by bolting together of the component parts.

Also included in the structure 10 are a number * % % 241536 of mounting units 30 of the kind shown in Figure 2. The unit 30 comprises two somewhat box-shaped and cage-like components 32. Each unit 30 comprises two parallel, spaced, upright mounting elements 34 from which extend, in a rearward direction, lower spaced parallel members 35 and upper spaced parallel members 37. These members 35, 37 join at the ends remote from the mounting elements to a generally-planar wall 38. The two components 32 are arranged side by side as shown, with the elements 34 of both components in a common vertical plane so that the walls 38 are likewise in a single plane parallel to and spaced from that containing elements 34. The two elements 34 are joined by a transverse third mounting element 40 which extends normally to the two elements 34 of each component 32 and joins the two components 32. Thus, the element 40 of each component 32 joins the members 37 at the junction between elements 34 and members 37, so that the elements 34 extend downwards from the element 40 at spaced locations along the length of the element 40.

The elements 34 and 40 have openings 46, 36 therein at spaced locations along the lengths thereof, whilst the walls 38 have openings 48 therein.

Units 30 are bolted to the support members 16 in the fashion shown in Figure 5. In particular, the members 16 have forwardly open lengthwise extending slots 16a and bolts 54 are provided which extend through the openings 50 in the wall 38 and into threaded elements 56 retained within the support member 16, behind the slots 16a. 24 1556 When so positioned, the elements 40 and 34 of the units 30 associated with each set 12, 14, of support members 16 are positioned with the elements 40 extending horizontally and the elements 34 vertically, downwardly from elements 40, and in a coplanar array, the plane of which is parallel to and spaced somethat in front of the plane of the respective set of support members 16.

Aside from the units 30, the structure 10 includes at its lower portion a number of somewhat differently formed mounting units 60 of the kind shown more particularly in Figure 3. Each of these has a lengthwise extending mounting element 40 only and does not possess the mounting elements 34. Two generally U-shaped mounting component? 62 are provided at the rear of the element 40 and these are secured to ones of the support members 16 in each set 12, 14 by means of bolts (not shown), so that the element 40 is contained in the same plane as the elements 40 and 34 of the units 30 associated with that set 12, 14.

As shown in Figure 6, each mounting unit 30 is capable of accepting thereon seven connector devices 66, 68, there being four of the devices 68 and three of the devices 66. More particularly, each mounting element 40 defines three end-to-end portions 40a, 40b, 40c, upon which the three devices 66 are mounted each by means of a plurality of hook elements (bolting pins) positionable in ones of the slot-like openings 36. The hook elements may, for example, comprise rearwardly protecting pins with enlarged heads, the openings 36 having an enlarged • 24 1536 % 11 upper portion 36a into which the head may be received and a downwardly depending slot-like portion 36b of lesser width than the head of each element whereby the heads may be entered into the slots at the portions 36a and the hook elements then moved downwardly by movement of the device 66 upon which they are retained so that narrow neck portions of the hook elements are retained in the portion 36b. To facilitate this action, the element 40 is, as shown, in the form of angle cross-section having two lengthwise extending sections 40d, 40e, arranged at right angles and a smaller corner section 40f which extends at 30° to the section 40e, and 60° to the section 40d. Portions 36a of the openings 36 are positioned adjacent the junction line of sections 40d, 40f, with portions 36b extending across sections 40e, 40f.

Figures 7 and 8 illustrate the action involved in attaching a device 66 to an element 40. Here, one hook element is designated by reference numeral 70, and has a small diameter portion 70a projecting from the rear of the device 66 and an enlarged head 70b. As shown in Figure 7, the device 66 is first tilted upwardly at an angle of about 30° to the horizontal as viewed from the side and is then moved towards the element 40 so that the head portion 70b is passed through the portion 36a of slot 36 to locate the head portion 70b behind the section 40f of the element 40. The direction of movement to effect this is indicated by arrow 72 in Figure 7. Then, the device 66 is swung downwardly in the direction indicated by arrow 74, as shown in Figure 8, to enter the element 70 into the slot portion 36b, more particularly to enter thereinto the portion 70a thereof, with the 241536 % % % 12 head portion 70b being behind the slot and engaging rear surface portions of the section 40e of the member 40 disposed one to either side of the portion 36b of the slot 36, The ability to swing the device 66 as before described permits the device to be temporarily positioned at a location similar to that shown in Figure 7, such as by holding of head portions 70b against an upper rear surface portion of the section 40f immediately above the opening portion 36a to facilitate access to the devices particularly when required for making connections thereto.

The devices 68 are of generally similar form to the devices 66 and are secured to the elements 34 in similar fashion, but require to be swung about vertical axes to effect engagement with the elements 34, in view of the latter extending vertically. In this regard, elements 34 are each of angle section form having two lengthwise extending sections 34a, 34b and a connecting corner section 34c arranged at 30° to these, in similar fashion to the elements 40. Again, the openings 46 are of slot-like form having enlarged head portions 46a positioned on the junction line between sections 34b, 34c and slot-like portions 46b extending therefrom, across the section 34c and onto the section 34a.

The openings 36 in the section 40 associated with >:nit 60 are also similarily configured to those on the section 40 associated with unit 30, and mounting of devices 66 thereon is effected in the same way as described in relation to units 30. 24 1536 % 13 The connector devices 66, 68 are of generally • like form, each having an insulating body 78 with a number of electrically conductive contact terminals 80 thereon, these being arranged in a number of rows which are side by side and which extend transversely across a front face of each. The devices 66 are slightly smaller than the devices 68, having fewer terminals. Further, because there are four devices 68 and only three devices 66 associated with each unit 30 there are for each unit 30 fewer terminals associated with devices 66 than are associated with devices 68. By assigning the devices 66 for use with cabling to active devices within the telephone exchange and using the devices 68 for cabling to the street going to customers or the like, effective use is made of the available space on the frame structure 10, since the number of terminals required for connection to active devices within the exchange is usually less than the number required for external plant.

In use, the main distribution frame formed by use of the support structure 10 and devices 66, 68 as above described may be used in the same way as conventional main distribution frame, with connections being established to the terminals of the connector devices as required by use of external cabling and by use of jumper leads therebetween. Because devices 66, 68 providing connection to both external and internal plant are located adjacent each other and generally in a single plane forwardly of the associated respective set of support members 16, the length of jumper leads may be minimised. Furthermore, extension of the capacity of the main 241536 14 distribution frame may readily be increased by adding more mounting units 30 as required.

Where, the lesser number of devices 66 as compared with devices 68 causes a deficiency in the required number of devices 66/ use may be made of the' aforedescribed units 60, to provide mounting for further devices 66.

As shown, the structure 10 is designed to permit units 30 to be secured to each of two sides, one to each of the sets 12, 14 of support members 16. Alternatively, it would be possible of course to provide a single-sided unit having only one of the sets 12 or 14.

Figures 9 & 10 illustrate one manner of allocation of devices 66, 68 as between external cable and internal equipment/ such as the line interface equipment. Furthermore/ various jumpers 9 6 are shown, by way of example, and these run between various of the devices. This running is facilitated by the use of jumper guides 94. It will be observed that units 30 are arranged in end-to-end extending sets so as to form vertically spaced layers 110 of devices 66, 68 there being, within each layer, a number of devices 66 and a number of devices 68 each device 66 being adjacent at least one device 68. At the top of each layer, the members 37 of the units 30 form a support platform 100 for running of the jumpers 96. Furthermore, since the layers 110 are spaced apart from each other vertically, there is a space 98 (Figure 10) between each layer within which * % 2415 3 6 the jumpers are readily laid on the platform 100 so defined. Also as shovm in Figure 10, where the units 60 are employed, these likewise form an end-to-end extending layer 110, in this case having only devices 66, the mounting components 62 again defining an upper platform for supporting jumpers.

The described arrangement has been advanced merely by way of explanation and many modifications and variations may be made thereto without departing from the spirit and scope of the invention which includes every novel feature and combination of novel features herein disclosed.

Claims (14)

WHAT WE CLAIM IS: - 16 - 24 1 53

1. A modular mounting unit for mounting at least one connector device to a main distribution frame, said main distribution frame including generally upright parallel 5 support members arranged to define a first plane and said connector device having an elongate electrically insulative body including rows of electrically conductive terminals extending along the length of said body and positioned at one generally planar fiace of said body, said modular mounting unit comprising: first and second mounting components detachably fixable to respective ones 10 of said support members; and at least one elongate mounting element defining a second plane substantially parallel, in use, to said first plane, said mounting element including means for mounting said at least one connector device thereto so said planar face defines a third plane substantially parallel to said first and second planes such that said second plane 15 is disposed between said first and third planes.

2. A mounting unit as claimed in claim 1, wherein said at least one mounting element is arranged so that at least two said connector devices can be mounted to said unit, each extending lengthwise along and being interconnected with said at least one 20 element.

3. A mounting unit as claimed in claim 1, wherein said unit includes at least three of the mounting elements defining said second plane, two of which are arranged in a parallel spaced relationship and the third of which is arranged substantially 25 perpendicular to the other two.

4. A mounting unit as claimed in claim 3, wherein the two parallel elements extend from the third element at spaced locations along the length thereof. 30

5. A mounting unit as claimed in claim 3, wherein the two parallel elements extend from locations which are spaced from but adjacent to spaced locations along the length of the third element. ' o\ 18 MAY 1894 n,1i.Vj1)uiuajw.»iiy>.T ■ v „ n / 17 - 24153$

6. A mounting unit as claimed in claim 2, wherein said unit includes at least five of said mounting elements, one including three end-to-end located portions thereof, the other four being substantially parallel with respect to each other, being substantially perpendicular to said one mounting element and defining said portions 5 of said one element.

7. A mounting unit as claimed in any one claims 3 to 6, wherein said connector devices include first connector devices for providing cable terminations for internal plant and second connector devices for providing cable terminations for external plant, 10 said connector devices in use, being mounted on said mounting elements such that said first connector devices are orientated differently with respect to said second connector devices, in accordance with the orientation of said mounting elements.

8. A mounting unit as claimed in claim 7, wherein the planar faces of the 15 insulative bodies of adjacent said first and second connector devices when mounted face the same direction and are relatively accessible for the connection of jumper leads

9. A mounting unit as claimed in claim 8, wherein said connector devices are 20 detachably mounted thereto.

10. A mounting unit as claimed in any one of claims 1 to 9, wherein the mounting means of said at least one element and cooperating mounting means of the at least one connector device are configured to enable said connector device to be held in a 25 temporary position by said mounting element wherein connection of jumper leads and cables thereto is facilitated.

11. A mounting unit as claimed in claim 10, wherein said mounting means are apertures and said cooperating mounting means are hook elements.

12. A main distribution frame support structure including at least one mounting thereto. 30 unit as claimed in any one of claims 1 to 11 and said generally upright parallel *4 1 53$ - 18 support members arranged to define said first plane, said at least one unit being fixed thereto so as to mount said at least one mounting element to define said second plane.

13. A main distribution frame comprising the support structure as claimed in 5 claim 12 and said at least one connector device mounted thereto.

14. A modular mounting unit substantially as hereinbefore described with reference to the accompanying drawings. ^ Day OF A.J. PARK & SON -J io p. -r, • Audits for the applicants END OF CLAIMS 94033l4i.VJiJuVBn>J41JSa.9