This application is a National Stage Application of PCT/EP2008/005073, filed 24 Jun. 2008, which claims benefit of Serial No. 10 2007 032 578.0, filed 9 Jul. 2007 in Germany and which applications are incorporated herein by reference. To the extent appropriate, a claim of priority is made to each of the above disclosed applications. 
     BACKGROUND 
     The invention relates to a line module for telecommunication and data engineering, comprising a housing and at least one attachment means. 
     In existing copper telecommunication networks, the access network is constructed as radial network in most cases. In this network configuration, the main cables are brought out of the switching office and distributed to the various cable distributors of the corresponding subscriber regions. The main cable is distributed to the various cable distributors via cable sleeves. From the cable sleeves, the distributed main cables then go to the cable distributors where they are connected to terminal heads and are run as distribution cables in the respective streets of the subscribers. The connection to the terminal distribution box of the subscriber is then made in most cases by means of a sleeve in the distribution cable. Due to this fanning out of the network towards the subscriber, the connection of the main cables at the subscriber or line side at the main distributor is the only location in the access network where all connections (lines) run together in space and can be centrally tested. The number of terminal heads in a cable distributor is dependent on the type of construction of the cable distributor, but a typical value is about 12 terminal heads per cable distributor. 
     A terminal head consists, for example, of a mounting or receiving shell for 10 terminal strips which, in turn can in each case connect 10 pairs. Thus, 100 pairs can be connected by means of one terminal head. The receiving shell is then preferably hooked into the cable distributor rack with preassembled clamping nuts, and the clamping nuts then snap in behind the rack rails. The receiving shell is then clamped by tightening fitting screws and a ground connection is made. 
     The rack rails can be dimensioned in length in such a manner that a number of terminal heads can snap in (for example three), or can be designed for only one terminal head. 
     From DE 10 2004 017 605 A1, a connector for circuit boards is known comprising a number of contact elements, the contact elements in each case having two connecting sides, one connecting side being constructed as insulation displacement contact for connecting wires and the other connecting side being constructed as forked contact for contacting terminal areas on the circuit board. 
     SUMMARY 
     The invention is based on the technical problem of creating a line module which can be arranged on carrier rails in a space-saving manner. 
     For this purpose, the attachment means is constructed as at least one lever having a hook-shaped element which can be pivoted via a rotating bearing. As a result, the hook-shaped element can engage behind an arm of the carrier system and attach the line module to the carrier system. 
     In a preferred embodiment, the lever is arranged on a top part and/or a bottom part of the housing via the rotating bearing, the lever also preferably being constructed to be flat and level and being pivoted in a plane parallel to the top part and/or bottom part so that only little space is needed above and below the line module for moving the lever. 
     In a further preferred embodiment, two levers are in each case arranged on the top part and/or the bottom part. This results in uniform force distribution. 
     In a further preferred embodiment, an excentric bend of the lever, at which the hook-shaped element is arranged, projects from the rotating bearing. 
     In a further preferred embodiment, the top part and/or the bottom part has protruding parts in relation to side parts, the rotating bearing being arranged on the protruding part, the protruding parts being preferably located at the rear of the housing. 
     Further preferably, the line module is constructed as terminal head. In principle, the line module can also be a line module for copper wires or glass fibers. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the text which follows, the invention will be explained in greater detail with reference to a preferred exemplary embodiment. The figures show in: 
         FIG. 1  a perspective front view of an unequipped housing of a terminal head, 
         FIG. 2  shows a perspective rear view of an unequipped housing with the rear wall removed, 
         FIG. 3  shows a perspective front view of a fully equipped housing, 
         FIG. 4  shows a perspective rear view of the fully equipped housing, 
         FIG. 5  shows a top view of a lever, and 
         FIG. 6  shows a diagrammatic top view of a circuit board. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a housing  10  of a terminal head  1  (see  FIG. 3 ). The housing  10  comprises a top part  11 , a bottom part  12 , a front part  13 , two side parts  14  and a rear wall  15  (see  FIG. 2 ). The top part  11 , the bottom part  12 , the front part  13  and the two side parts  14  are preferably permanently connected to one another, for example riveted. The front part  13  has six horizontal metal rails  16  between which five slots  17  are formed for inserting circuit board connectors. The lowermost metal rail  16  is slightly narrower than a top metal rail  16 . From the topmost metal rail  16  and from the lowermost metal rail  16 , two lugs  18  protrude in each case which are used as stopping means for levers  19 , arranged at the top part  11  and at the bottom part  12 , respectively, which engage openings  20  of the levers  19  (see  FIG. 5 ). The side parts  14  are constructed to be stepped in width. A first part piece  21  adjoins the front part  13 , from which part piece a second part piece  22 , angled towards the outside at right angles, protrudes from which a third part piece  23  protrudes which protrudes at right angles from the second part piece  22 , the third part piece  23  extending towards the rear wall  15  and being arranged in parallel with the first part piece  21 . The third part piece  23  is constructed with inwardly bent punched openings  24  and with inwardly bent roundings  25 , a circuit board  70  (see  FIG. 6 ) being guided in each case between two roundings  25 . The upper part  11  and the lower part  12  are in each case finished flush with the front part  13 , wherein in each case a lug  26  with an opening  27  protrudes at the center, at which a covering hood can be attached. The upper part  11  and the lower part  12  are longer than the side parts  14 , the upper part  11  having centrally a pot-shaped cutout at the end of which a lug  28  with thread is arranged which is bent perpendicularly downward (see  FIG. 2 ). The lower part also has two openings  29 , one opening  29  being covered in  FIG. 2 . On the parts  44 ,  45 , protruding over the side parts  14 , of the upper part  11  and the lower part  12 , respectively, rotating bearings  30  for the levers  19  are arranged, wherein the protruding parts  44 ,  45  are used at the same time as support area for the levers  19 . At the first part piece  21  of the side parts  14 , wire guides  31  with in each case three outwardly bent fingers  32  are arranged at the end of which in each case a bend  33  is arranged. The rear wall comprises a plate  34  in which ten slots  35  are inserted. At the rear wall  15 , a lug  36  is attached which has three legs  37 - 39 . The leg  37  is arranged centrally over the entire height at the rear wall  15 . At the lower side of the leg  37 , the leg  38  protrudes at a right angle, from which the leg  39  then protrudes obliquely downward. The lug  36  is permanently connected to the rear wall  15  via rivet connections  40 , the rear wall  15  being screwed to the lug  28  via a screw  41 . Furthermore, the leg  38  is screwed to the lower part  12  through the openings  29 , only the nuts  42  of the screw connection being visible in  FIG. 2 . The leg  37  divides the rear wall  15  so that in each case five slits  35  are arranged on the left-hand side of the leg  37  and in each case five slots  35  are arranged on the right-hand side of the leg  37 . One slot  35  in each case on the left and on the right form one, pair and are exactly opposite a slot  17  on the front. The leg  39  is used for attaching a cable, whereas the wires of the cable run to the circuit board connectors  50  are attached to the leg  37 . For this purpose, the leg  39  has a hole  43 . The cable jacket is cut in and provided with holes, plastic tape being wound around the exposed cable core and the remaining cable jacket. Through the hole  43  and the holes in the cable jacket, a mushroom head screw is then inserted, tape is wound again around the cable end and the screw is tightened by a nut. In cables with shielding, this is grounded via the screw, preferably also using a metal contacting plate with teeth between screw and shielding for this purpose. 
     To equip the housing  10 , five circuit boards  70  are inserted into the housing  10  from the rear, the circuit boards  70  in each case being guided between two roundings  25  on the left-hand and right-hand side part  14 . Following this, the rear wall  15  is screwed on, the punched cutouts  24  forming stops for the rear wall  15  so that it is prevented that the rear wall  15  is pushed inward when the circuit boards are equipped with the circuit board connectors  50 , and in each case ten circuit board connectors  50  are inserted on the circuit boards from the front and the rear of the housing  10 . In this arrangement, the circuit board connectors  50  of the front are scarcely spaced apart whereas the circuit board connectors  50  of a row of the rear are separated by the leg  37  which is why the housing  10  is also wider at the rear than at the front. So that the circuit board connectors  50  can pass the circuit boards  70  with their housing edges, they have cut-ins  74 ,  77 ,  78  (see  FIG. 6 ) for the inwardly pointing side walls  51  of the circuit board connectors  50 . The circuit board connectors  50  of the rear are equipped with arrester magazines  52  which, for example, are plugged into break contacts of the circuit board connectors  50 , ground contacts constructed as double-forked contacts  53  of the arrester magazines  52  being pushed onto the front faces of the part pieces  23 . Furthermore, it is shown in  FIGS. 3 and 4  how the levers  19  are pivoted into an attachment position at carriers  60 . The carriers  60  are constructed to be U-shaped in cross section. The lever has an opening  61  for the rotating bearing  30 . Furthermore, the lever  19  has an excentric bend  62  at which a hook-shaped element  63  is arranged, the inside edge  64  of the hook-shaped element  63  being rounded. The hooked-shaped elements  63  of the four levers  19  engage the attachment position behind a leg  65  of a carrier  60  in each case and hold the terminal head  1  fixed on the carriers  60 . In  FIGS. 3 and 4 , the two top circuit board connectors  50  of the front are covered with a label frame  54 . 
     Each circuit board connector  50  can terminate ten pairs so that 100 pairs can be connected at the front and 100 pairs can be connected at the rear, that is to say a total of 200 pairs. However, the constructional height of the terminal head  1  is only half as high as that of a conventional terminal head. Since the terminal head  1  only covers less than one half of the width of the carrier, a further terminal head  1  can be easily arranged on the left and on the right so that, as a result, the terminal density is doubled. The correlation between the contacts of the circuit board connectors from the front to the rear is such that in each case one circuit board connector  50  of the front is connected to the circuit board connector  50  of the rear which is almost exactly opposite to it (almost because of the offset due to the leg  37 ), the almost opposite contacts in each case being connected to one another. 
       FIG. 6  shows a diagrammatic top view of a circuit board  70 . In the area of the front end face  71 , twenty contact pads  72  are arranged on the left and twenty contact pads  73  are arranged on the right for the two front circuit board connectors  50  which are inserted into the slot  17 . In this arrangement, the circuit board  70  has a first cut-in  74  so that the right-hand side wall  51  of the left-hand circuit board connector  50  and the left-hand side wall  51  of the right-hand circuit board connector  50  can slide past on the circuit board  70 , the terminal contacts, preferably constructed as forked contacts, for the circuit board  70  preferably contacting the contact pads  72 ,  73 . Since the two circuit board connectors  50  are arranged directly adjacently to one another at the front, one cut-in  74  is sufficient. At the rear, contact pads  75 ,  76  are correspondingly arranged for the circuit board connectors  50  of the rear  15 . In this arrangement, the circuit board has two cut-ins  77 ,  78  since the two circuit board connectors  50  are arranged farther apart from one another. Laterally, the circuit board  50  is adapted to the shape of the side parts  14 , the edges  79 ,  80  being offset towards the inside at the front and the rear so that the other side walls  51  of the circuit board connectors  50  can slide past the circuit board  70 . The contact pads  72 ,  73 ,  75 ,  76  are preferably arranged at the top  81  and the bottom of the circuit board  70 . The conductor runs between in each case one contact pad  72 ,  73  of the front and one contact pad  75 ,  76  at the rear are not shown. The conductor runs can be constructed uncrossed or crossed. To compensate for cross talk, the capacitive coupling between the layers of a multi-layer board as circuit board can also be utilized in supplementary fashion or as an alternative to crossing the conductor runs. 
     LIST OF REFERENCE DESIGNATIONS 
     
         
           1  Terminal head 
           10  Housing 
           11  Top part 
           12  Bottom part 
           13  Front part 
           14  Side part 
           15  Rear wall 
           16  Metal rails 
           17  Slots 
           18  Lugs 
           19  Levers 
           20  Openings 
           21  First part piece 
           22  Second part piece 
           23  Third part piece 
           24  Bent cutout 
           25  Roundings 
           26  Lug 
           27  Opening 
           28  Lug 
           29  Openings 
           30  Rotating bearing 
           31  Wire guides 
           32  Finger 
           33  Bend 
           34  Plate 
           35  Slots 
           36  Lug 
           37 - 39  Leg 
           40  Riveted connections 
           41  Screw 
           42  Nuts 
           43  Hole 
           44  Protruding part (top part) 
           45  Protruding part (bottom part) 
           50  Circuit board connector 
           51  Side walls 
           52  Arrester magazine 
           53  Forked contact 
           54  Label frame 
           60  Carrier 
           61  Opening 
           62  Bend 
           63  Hook-shaped element 
           64  Inside edge 
           65  Leg 
           70  Circuit board 
           71  Front face 
           72  Contact pad 
           73  Contact pad 
           74  Cut-in 
           75  Contact pad 
           76  Contact pad 
           77  Cut-in 
           78  Cut-in 
           79  Edge 
           80  Edge 
           80  Top
The invention relates to a line module for telecommunication and data engineering, comprising a housing ( 10) and at least one mounting means, wherein the mounting means is in the form of at least one lever ( 19) with a hook-like element ( 63) which can be swivelled via a pivot bearing ( 30).