Patent Document

CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    This application is a national stage entry of PCT/EP2014/062487 filed Jun. 14, 2014, under the International Convention claiming priority over French Patent Application No. 1355612 filed Jun. 15, 2013. 
     
    
     TECHNICAL FIELD 
       [0002]    The invention relates to a method for integrating an avionic cabling assembly interconnection module in an electronic housing cabinet and for connecting electronic modules. The invention also relates to an electronic cabinet equipped with at least one interconnection module of this type, as well as to an aircraft comprising an avionic bay consisting of a set of cabinets of this type for connecting the electric/electronic equipment via cabling distributed in that aircraft. 
         [0003]    The invention relates to the field of avionics and generally applies to hardware for the electric/electronic processing and management of the equipment of an aircraft: electrical centers, computers, power modules, inertial systems, controls and associated functions (converters, etc.). The hardware, which generally comprises cards and electronic components, is produced in the form of a multitude of electronic modules—called “blades” in English terminology—integrated in cabinets. The assembly of these cabinets constitutes an avionics bay. 
         [0004]    The cabinets are produced in the form of box-shaped cases equipped with means of housing electronic modules in the vertical position, parallel with each other. These cabinets are equipped with openings for the ventilation of the electronic modules and with a connection interface in order to couple the avionics bay with different operational equipment of the aircraft according to a network architecture, via assemblies of bundles of electric/optical cables as well as an on-board electrical power supply network. In general, the operational equipment is distributed along the fuselage and in the wings of the airplane. 
         [0005]    The avionics bay is preferably located in the front lower part of the fuselage, under the cockpit, in controlled pressure and temperature conditions: stable ambient pressure (pressurized zone of the aircraft), and controlled temperature. Mechanical structures, known as “chairs”, are usually provided in the access area of the bay in order to allow maintenance of the cabinets in liaison with their immediate environment and to allow a passage for the ventilation air flows of these cabinets. 
         [0006]    Each chair is principally constituted by a horizontal support panel equipped with locking means, a rear panel with openings—to allow the passage of the bundles of cables—and lateral struts. Such an installation is defined by an international aeronautical standard: ARINC600. An assembly according to this standard is for example described in the patent document U.S. Pat. No. 6,797,879. 
       BACKGROUND OF THE INVENTION 
       [0007]    Because of the increase and diversification of equipment, the result of this is an increase in the quantity and complexity of the connector technology of the cabinets: multiplication of the cablings, connections of electric and optical nature, difficult handling in a small available space. There is also a resulting increase in weight and costs (long maintenance cycle times, greatly increased computing power requirement, ever increasing number of cables and functions, etc.) and an unsuitability for new equipment having a different connector technology from the one initially provided. Moreover, heat dissipation is no longer correctly ensured because the ventilation is inadequate with the increase in the number of cabling assemblies and of the performance required by the new equipment. 
         [0008]    In order to try to overcome at least some of these disadvantages, the patent document FR 2 927 222 describes an electronic rack installed in an aircraft in which a “function module” of the electronic modules and an interface module of the external connectors of the motherboard are arranged in a juxtaposed manner on the front face of the rack, is such a way as to facilitate access to the electronic modules and to the external connectors through the front face. This system eliminates the connector technology on the rear face so that all of the connections are made on the front face of the racks. However, this arrangement considerably increases the connection density of the cabling on this face. 
         [0009]    From the patent document FR 2 822 130 there is also known a cabling network architecture in which intermediate interconnection modules are connected to each other by identical cabling cords and connected to interconnection end modules connected to cabling assemblies adapted to the terminal devices. This architecture makes it possible to simplify the identification of the connections to be made but multiplies the number of interconnection modules by adding intermediate interconnection modules. 
       SUMMARY OF THE INVENTION 
       [0010]    In the prior art, the electronic modules provide the complex function of electronic conversion and of optoelectronic conversion, of lightning protection or also of separate filtering between separate clean zones and dirty zones, the handling of these modules then giving rise to risk of damage, of misalignment and of soiling. In particular, interventions on modules connected to optical fibers require a specialized technique for the connection/disconnection of these fibers. 
         [0011]    The purpose of the invention is to optimize the use of electronic cabinets with regard to avionic architecture, with a simplified connector technology inside the cabinets and a flexibility in adapting the external connector technology to the connectors of the cabling assemblies—electronic and/or optical connector technologies—as well as structurally: a special ventilation path for the electronic modules in a chassis having a configuration appropriate for the connector technology and for the ventilation, whilst being compatible with a reduction of weight by the use of specific materials, and a specific mounting of the cabinet on the primary aircraft structure allowing periodic uncoupling. 
         [0012]    Moreover, the invention aims to provide more modularity whilst controlling the environmental conditions of the elements forming it and therefore allowing a partial requalification of these elements, in particular more modularity to the electronic modules, as well as simple and safe intervention. 
         [0013]    In order to do this, the invention provides for carrying out a conversion function shifted to an end portion of the cabinet coupled to a detachable modular interconnection in liaison with the cabling assemblies of the avionic architecture. 
         [0014]    More precisely, the present invention relates to a method for integrating an avionic cabling assembly interconnection module in an electronic cabinet for housing and connecting electronic modules comprising a front face, a back panel having an internal face provided with a card for connection to said electronic modules and two lateral walls having external faces. This method comprises: 
         [0015]    moving, parallel with a lateral wall of the cabinet, at least one interconnection module comprising connectors, towards said cabling assemblies on a principal external face and a connection circuit on a lateral face, 
         [0016]    inserting said interconnection module in a lateral housing space limited by the external face of said lateral wall and edges respectively extending the back panel and the front face, 
         [0017]    mechanically connecting the ends of a handle mounted, such that it pivots vertically on said module, with fixed points on the external face of said lateral face, 
         [0018]    pivoting the handle in such a way that said handle ends rotate about fixed points in order to move said module in translation along the external face of the lateral wall and that connection circuits, arranged on a lateral face of said interconnection module in liaison with the connectors of said principal external face and on the internal face of said edge of back panel in liaison with the connectors of the electronic modules of the back panel, become closed one upon the other so that it is possible to couple the cabling assemblies with the electronic modules, and 
         [0019]    locking said module in the closed position by reversible mechanical clamping between said lateral wall and said interconnection module. 
         [0020]    The invention also relates to an overall box-shaped electronic cabinet for aircraft, equipped with at least one detachable interconnection module comprising connectors for coupling to cabling connectors leading to equipment of the aircraft. The cabinet is formed from a chassis defining a front face, an upper panel, a lower panel, a back panel parallel with the front face, and two parallel lateral walls. The back panel comprises a back card, called a backplane, able to be connected to a set of electronic modules intended to be housed in the cabinet whilst remaining extractable from the front face. In this cabinet, the rear wall is extended by edges provided with connectors able to be coupled with connectors arranged on a lateral face of the detachable interconnection module. The connectors of the edges of the rear wall are coupled with the back panel card by a multi-layer connection printed circuit. Means of closing and releasably locking said at least one detachable interconnection module are provided between an interconnection module handle and the lateral wall of the cabinet against which said module is able to be placed in order to couple, in a reversible manner, the edge connectors of the rear wall with the lateral face connectors of the interconnection module, the connectors for coupling with the cabling of the aircraft being arranged on an external face of said interconnection module in liaison with said lateral face connectors. 
         [0021]    The releasable lateral connection makes it possible to reduce the dimensions generated by the volumes occupied by the cabling and to adapt the electric and optical connections between the connectors of the detachable interconnection module coupled with the aircraft cabling connector technology and the electronic modules of the cabinet via appropriate high data rate protocols, in particular Ethernet protocols. 
         [0022]    Advantageously, the cabinet according to the invention makes it possible to transmit fast bidirectional information using optical fibers, via a bidirectional optical/electric conversion interface card, between the connectors of the detachable interconnection module coupled to the aircraft cabling connector technology and the electronic modules of the cabinet, which makes it possible to overcome the problems of integration. 
         [0023]    In an advantageous variant, at least one dissipator is mounted on an external face of the multi-layer printed circuit in order to facilitate the evacuation of calories by conduction or convection. 
         [0024]    According to preferred embodiments: 
         [0025]    the cabinet is essentially constituted by a low-density material chosen from aluminum-based metal alloys and composite materials based on carbon fibers; 
         [0026]    the bidirectional optical/electric conversion interface card is integrated in a printed circuit coupled to the connectors of the edges of the rear wall via a multi-layer connector for conveying heavy current, each layer of the connector being able to be inserted by force in a terminal for connection to the printed circuit and at least one dissipator being able to be mounted on an external face of the multi-layer connector; 
         [0027]    the optical/electric conversion interface card comprises a transmitter/receiver associated with two distributed amplification reclockers; 
         [0028]    the means of closing the interconnection modules comprise hooks mounted at the ends of the handle of the interconnection module, these hooks are mounted engaged on lugs in order to pivot about these lugs by rotation of the handle and to move the interconnection module in translation until it reaches the extended edges of the rear wall in the closed position, and the locking means comprise a lever coming from the side wall and able to lock the handle in the closed position by clamped connection; 
         [0029]    the chassis of the cabinet comprises intermediate inclined or vertical walls between the upper and lower panels and respectively at least one of the front and/or rear faces, these intermediate walls being provided with ventilation openings in order to allow a single or double flow of ventilation air in the cabinet between the openings of the intermediate walls formed in liaison with a same face; 
         [0030]    the cabinet has a self-supporting suspension by rods structure able to allow the installation of the cabinet in a housing area of the aircraft making it possible to allow periodic decoupling. 
         [0031]    The invention also relates to an aircraft comprising an avionics bay constituted by a set of cabinets such as defined above and arranged in such a way as to allow a flow of air between them and to transmit electric/optical control signals to equipment of the aircraft via electric and/or optical cabling assemblies. 
         [0032]    According to a preferred embodiment, the aircraft comprising a fuselage, wings, a cockpit, a cockpit floor, a nose hold and a cargo hold, the cabinets of the bay are arranged in the nose hold, the cargo hold and/or the floor of the cockpit. The aircraft is provided with electric/electronic equipment distributed in the fuselage and the wings of the aircraft and coupled with the cabinets in the bay via electric and/or optical cabling assemblies spread out according to an architecture integrating the distribution of the equipment in the aircraft. 
     
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         [0033]    Other information, features and advantages of the present invention will become apparent on reading the following non-limited description, given with reference to the appended figures in which: 
           [0034]      FIGS. 1 a  and 1 b    show general front and rear views in perspective of an example of an electronic cabinet according to the invention; 
           [0035]      FIG. 2  is a lateral cross-sectional view of the cabinet shown in  FIG. 1  with plots of the ventilation air flows; 
           [0036]      FIG. 3  is a perspective view of an example of an interconnection module according to the invention; 
           [0037]      FIG. 4  shows partial views in perspective  4   a  to  4   c  of an example of a detachable interconnection module with a handle in the open position (view  4   a ) and in the closed position before (view  4   b ) and after (view  4   c ) locking; 
           [0038]      FIG. 5  shows diagrams  5   a  to  5   d  of successive steps of integration of the interconnection module in the electronic cabinet by insertion, closing and locking; 
           [0039]      FIG. 6  shows a plan view of the progress over time (diagrams  6   a  to  6   d ) of a mechanical hook/lugs connection during the pivoting of the handle of the interconnection module of the cabinet in order to close this module on the cabinet; 
           [0040]      FIGS. 7 a  to 7 c    show a plan view of an architecture for the distribution of equipment in an aircraft in liaison with avionics bay cabinets installed in the nose hold ( FIG. 7 a   ), and views of this installation in perspective ( FIG. 7 b   ) and from the rear of the aircraft ( FIG. 7 c   ); 
           [0041]      FIG. 8  is a block diagram of bidirectional opto-electric connection according to the invention between the aircraft cabling assemblies and the electronic modules inserted in an electronic cabinet; 
           [0042]      FIG. 9  is a block diagram of block opto-electric conversion for a communication unit according to the invention; and 
           [0043]      FIG. 10  is a diagrammatic cross-section of a multi-layer printed circuit optoelectronic conversion card according to the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0044]    In the present text, the qualifiers “front”, “rear”, “below”, “above”, “upper”, “lower”, “vertical”, “horizontal” and their derivatives or equivalents refer to relative arrangements of parts of elements in a standard configuration of use, notably with respect to an aircraft on the ground. The qualifier “lateral” refers to faces or walls having dimensions substantially less than the principal faces or walls of substantially larger dimensions of a same element. The qualifiers “internal” and “external” refer to faces oriented towards the inside or towards the outside of the electronic cabinet according to the invention. 
         [0045]    With reference to the front and rear perspective views of  FIGS. 1 a    and  1   b,  an electronic cabinet  1  according to the invention is formed by an overall box-shaped chassis  10  comprising a front face  11 , an upper panel  12 , a lower panel  13 , a back panel  14  parallel with the front face  11 , and two lateral and parallel walls  15  and  16 . 
         [0046]    The back panel  14  comprises on an internal wall  140  a back card  4 , called a back plane, connected to a set of electronic modules, such as the electronic module  5 , mounted on slides  51 . The electronic modules are housed in the cabinet  1  parallel with the lateral walls  15  and  16 . The electronic modules remain extractable through the front face  11 . The electronic modules are interchangeable without the use of a tool and without restricted handling because the cabling assemblies are all connected by the detachable interconnection module. Thus, the durations of maintenance cycles are substantially improved. 
         [0047]    The cabinet  1  also has movable carrying handles  17  and  18  mounted at the ends of the upper panel  12  and a rod  19  for withdrawing the cabinet  1 . The cabinet  1  is in fact mounted on the primary structure of the aircraft by means of a rod  19  suspension system which allows periodic decoupling. More generally, such mechanical suspension structures using rods in the zone housing cabinets make it possible to allow periodic decoupling of these cabinets in order to isolate them from aircraft modes. Moreover, the cabinet is self supporting and does not therefore require secondary structures such as chairs. 
         [0048]    Moreover, an interconnection module  6  is releasably locked on the lateral wall  15  by two levers  7  coming from that wall. Connectors  60  are mounted on the interconnection module  6 . These connectors are intended to be coupled with the connectors of the cabling assemblies of the equipment distributed in the aircraft—called aircraft cabling—as will be described in detail below. 
         [0049]    Moreover, the chassis  10  comprises two intermediate inclined walls P 1  and P 2  ( FIG. 1 a   ) between, respectively, the panels  12 ,  13  and the front face  11 . These walls P 1  and P 2  are provided with rows R 1  and R 2  of ventilation openings, respectively two openings O 1  and four openings O 2 . Moreover, the back panel  14  comprises ( FIG. 1 b   ), on intermediate walls P 3  and P 4  ( FIG. 1 b   ), at the edge of each panel  12  and  13 , an air flow nozzle, O 3  and O 4  respectively. 
         [0050]    The chassis of the cabinet  1  is essentially constituted by a low-density material, in this case an aluminum-based metal alloy in order to allow protection against environmental electromagnetic interference. It can also be made from a material based on carbon fibers in order to improve performance in terms of weight. 
         [0051]    The cross-sectional lateral view in  FIG. 2  shows the flow of air in the cabinet  1 , symbolized by the sets of arrows F 1  and F 2 . According to a main air flow system, the air enters into the lower openings O 2  and emerges through the upper openings O 1  (arrows F 1 ) on the same front face  11  ( FIG. 1 a   ). The openings O 1  and O 2  constitute a main forced conditioned air flow. Another forced air flow system is constituted by the lower opening O 4  and the upper opening O 3 , these openings O 3  and O 4  being arranged on the panels P 3  and P 4  of the rear wall  14  ( FIG. 1 b   ). According to an advantageous embodiment, the electronic modules  5  can be alternatively ventilated by one or the other of the two flow systems. According to a particular embodiment, the second flow through the openings O 3 -O 4  (arrows F 2 ) can constitute a back-up flow in the case of failure of the main flow system through the openings O 1 -O 2  (arrows F 1 ). 
         [0052]    The positioning of an interconnection module  6  will now be described with reference to  FIGS. 3 to 5 . The interconnection module  6  exhibits, in a detailed manner in the example embodiment shown in  3 , the connectors  60  dedicated to the transmission of signals to the aircraft cabling assemblies: optical communication connectors  60   a,  connectors  60   b  for transmission of signals in an Ethernet network and connectors  60   c  of power cables. All of these connectors are mounted on the external face  61  of the interconnection module  6 . 
         [0053]    The interconnection module  6  is provided with a generally vertical handle  8 , able to be articulated at its two horizontal ends  81  and  82  about a central vertical axis X′X. The partial views  4   a  to  4   c  of  FIG. 4  illustrate the locking of the interconnection module  6  in the cabinet  1 . 
         [0054]    In the partial view  4   a  shown in  FIG. 4 , the handle  8  of the interconnection module  6  is shown in the storage mode with the handle  8  locked in the so-called open position by a locking screw  64 . 
         [0055]    Referring to the views  4   a  and  4   b  of  FIG. 4 , said module  6  is in the mode of closing and then locking in said cabinet  1 . The closed position against the lateral wall  15  of the cabinet  1  is acquired by pivoting the handle  8  through 90° about the axis X′X (circular arrow R 1  in view  4   a ). The horizontal ends  81  and  82  (only the end  81  is seen in the partial view  4   b ) then come against the lateral wall  15 . 
         [0056]    The lever  7 , which is initially in the raised position in view  4   b,  is then lowered (arrow R 2 ) so that its arm  71  engages in a shoulder  83  of the handle  8  (view  4   c  of  FIG. 4 ). The head  72 , arranged at the end of the arm  71  of the lever  7 , is clamped against the external face  84  of the handle end  81 . The interconnection module  6  is then locked on the lateral wall  15  of the cabinet  1  (see  FIG. 1 a   ). The locking is releasable by loosening the head  72  and extracting the interconnection module  6  from the lateral wall  15  of the cabinet  1 . 
         [0057]      FIG. 5  diagrammatically illustrates the integration kinematics into and, by reverse kinematics, the extraction kinematics of the interconnection modules  6   a  and  6   b  from the electronic cabinet  1  equipped with the blade  5 , by diagrams  5   a  to  5   d  of successive steps of insertion, closure and locking. 
         [0058]    In diagram  5   a,  the modules  6   a  and  6   b  are brought towards the cabinet  1  parallel (translation arrows T 1  and T 2 ) with the lateral walls  15  and  16  of that cabinet  1 , in such a way as to be able to become inserted in lateral spaces E 1  and E 2 . These housing spaces are limited by the lateral walls  15  and  16  and edges  14   a,    14   b  and  11   a,    11   b  respectively extending the back panel  14  and the front face  11  of the cabinet  1 . The internal faces  140   a  and  140   b  of the edges  14   a,    14   b  of the back panel  14  and the lateral faces  62   a,    62   b  of the interconnection modules  6   a,    6   b  are fitted with connection circuits or connectors, C 1   a,  C 1   b  and C 6   a,  C 6   b  respectively. 
         [0059]    The connection circuits are intended to couple the connectors C 5  of the electronic modules  5  with the connectors  60   a  and  60   b  (cf. the connectors  60  on  FIG. 3 ) able to be coupled with connectors of aircraft cabling assemblies, via the back board  4  and the connection circuits C 1   a,  C 1   b  and C 6   a,  C 6   b.    
         [0060]    In diagram  5   b,  the modules  6   a  and  6   b  have been inserted in the spaces E 1  and E 2  so that they come against the internal faces  110   a  and  110   b  of the edges  11   a  and  11   b  of the front face  11  and against the external faces  15   a  and  16   a  of the lateral walls  15  and  16 . In this position, the ends of the handles  8   a,    8   b  of the modules  6   a,    6   b,  are mechanically connected to the fixed points  10   a  and  10   b  of the lateral walls  15  and  16 . 
         [0061]    By pivoting the handles  8   a  and  8   b  (arrows R 3  and R 4 ) about the fixed points  10   a  and  10   b,  the modules  6   a  and  6   b  are driven in translation along the faces  15   a  and  16   a  (arrows T 3  and T 4 ) towards the back panel  14  of the cabinet  1 . The closed position of the modules  6   a  and  6   b  is reached when the connection circuits C 6   a  and C 6   b  are placed in contact with the connection circuits C 1   a  and C 1   b  (diagram  5   c ). The handles  8   a  and  8   b  are then in the closed position. 
         [0062]    As shown in diagram  5   d,  the closed position of the circuits is locked by the lowering of the levers  7   a  and  7   b,  just like the lever  7  described with reference to diagrams  4   b  and  4   c  of  FIG. 4 . Locking by reversible mechanical clamping between the handles  8   a,    8   b  of the interconnection modules  6   a,    6   b  and the lateral walls  15  and  16  of the cabinet  1  is thus achieved. 
         [0063]    The pivoting of the handle  8  ( 8   a  or  8   b ) of the module  6  ( 6   a  or  6   b ) about fixed points  10   a  or  10   b  (diagram  5   b  of  FIG. 5 ) is more particularly shown in the diagrams  6   a  to  6   d  of the plan view in  FIG. 6 . These diagrams show the successive progress over time of a mechanical connection between a hook C 10 , formed at the end of the horizontal part  81  of the handle  8  (cf.  FIG. 4 b    or  4   c ), and a lug E 10  integral with the external face  15   a  of the lateral wall  15 . Following the diagrams  6   a  to  6   f,  it is apparent that the hook C 10  engages around the lug E 10  which serves as a fixed point, like the points  10   a  or  10   b.  The handle  8  pivots about the lug E 10  by the hook C 10 /lug E 10  engagement, and the module  6  is moved in translation (arrow T 3  cf. diagram  5   b ) during this pivoting in order to close the connection circuits of this module. 
         [0064]    A hook similar to the hook C 10  is of course present on the other horizontal end  82  of the handle  8  (cf.  FIG. 3 ) and pivots about a lug similar to the lug E 10  and arranged at an appropriate location on the external face  15   a  of the lateral wail  15 . 
         [0065]    Cabinets  1  thus equipped are installed in an aircraft according to the requirements for electric/electronic equipment defined by the aircraft constructor. The aircraft plan view shown in  FIG. 7 a    illustrates an example of distribution of equipment  9  installed in the fuselage  9 F, the wings  9 A and the tail  9 Q of an aircraft “A”. 
         [0066]    An architecture predefined as a function of the installation of the equipment is spread out as a network  9 L, composed of electric and optical cabling assemblies  90 , between the equipment  9  and the bay  9 B constituted by cabinets  1  of the type defined above. As illustrated by the perspective and rear views of the aircraft A in  FIGS. 7 b  and 7 c   , the cabinets  1  forming an avionics bay are installed, in this example, in the front cargo hold A 1  of the aircraft A. 
         [0067]    The cabling assemblies of the network  9 L are partly conveyors of optical signals. Communication with the electronic modules  5  of the electronic cabinets  1  (cf.  FIG. 1 a   ) is carried out according to the block diagram of bidirectional conversion of signals shown in  FIG. 8 . 
         [0068]    In this block diagram, the optical signals S H  coming from cabling assemblies  90  on an Ethernet communications network R E1  using the “1000BASE-SX” protocol are converted into electric signals S E  via an optical/electric conversion interface card  101 . Said interface card  101  is a card formed in the connection circuits C 1   a,  C 1   b  of the edges  14   a,    14   b  of the back panel  14  of the cabinet  1  (cf. diagram  5   a  of  FIG. 5 ). An example of a multi-layer conversion module is shown in  FIG. 10  (see below). 
         [0069]    The electric signals are then transmitted through the same connection circuit C 1   a,  C 1   b  to the computers and actuators  50  via the connectors of the back panel card  4  and the connectors C 5  of the electronic modules  5  (cf.  FIG. 1 a   )—via a back panel communications network R E1  using a protocol compatible with that of the network R E1 , in this case the Ethernet network using the “1000BASE-KX” protocol. 
         [0070]    The transmissions are advantageously bidirectional and fast using optical fibers, which makes it possible to overcome the problems of integration: control signals coming from the computers and actuators  50  are also transmitted to the equipment concerned via the cabling assemblies  90  and through the conversion interface  101 , on the Ethernet, R E2  and then R E1 , communication networks, in this case “1000BASE-KX” and “1000BASE-SX”. 
         [0071]    The block diagram shown in  FIG. 9  illustrates more precisely the components of the conversion interface card  101  for the signals provided by the Ethernet networks R E1  and R E2 . The principal component is a transmitter/receiver circuit (or “transceiver” in English terminology)  110 . The transceiver  110  used in this example is a component for a multi-mode fiber optic link, for example having a wavelength of 850 nm. 
         [0072]    In order to deliver a voltage and jitter level (“jitter” is the term used in English terminology) compatible with the back panel “1000BASE-KX” protocol, distributed amplification components  111  and  112  (or “reclockers” in English terminology) are connected to the transceiver  110 . The addition of these reclockers makes it possible to re-establish the signal levels specified for the computer or actuator in question. 
         [0073]    The reclocker  111  transmits the signals emitted by the electronic modules  5  to the transceiver  110  and the reclocker  112  transmits the signals received by the transceiver  110  to the electronic modules  5 . The connection between the transceiver  110  and the optical cable assemblies  90  is provided by the Ethernet network using the “1000BASE-SX” protocol R E1  over bi-directional, single-mode optical fiber. 
         [0074]    The invention provides a multi-layer connector  12 C, such as the one shown in diagrammatic cross-section in  FIG. 10 , to convey the power into the printed circuit  120 , which integrates a conversion interface card  101 , from rear wall edge connectors C 1   a,  Cb as far as the back panel  4  (cf.  FIG. 5 ). The multi-layer connector  12 C is connected to the printed circuit  120  by a connection terminal  123 . A dissipator  12 D is mounted on the external faces  12 E of this multi-layer connector  12 C in order to facilitate the evacuation of calories by conduction or convection. 
         [0075]    Said multi-layer connector circuit  12 C has a thickness of substantially 105 μm per layer, in this case with a specific stacking of a set  121  of five layers sandwiched between two, upper and lower, power layers  122  and  124 . 
         [0076]    The conveying of heavy currents is located on the outer faces  12 E of said circuit  12 C whilst respecting the top/bottom symmetry and associating these faces with the dissipator  12 D to avoid the problems of heat dissipation and to limit line losses. 
         [0077]    The conveying of fast or sensitive signals is carried out towards the exterior of the stack  121 , the power layers  122  and  124  separating the heavy currents from the fast and sensitive currents. 
         [0078]    The layers  121 ,  122  and  124  of the connector  12 C are inserted into the connector block for  123  of the printed circuit  120  by force fitting (or by “press fit” according to English terminology). These connectors have the advantage of being easily repairable. 
         [0079]    This multi-layer connector circuit has the advantages of carrying more heavy current whilst multiplying the number of thin connectors, allowing fast one-piece manufacture with insertion/extraction without tools, having no fitting/removal of connection elements (braids, etc.) and providing a considerable weight saving. 
         [0080]    The invention is not limited to the examples of embodiment described and shown. In particular, the cabinet is designed in order to comply with the most severe environmental levels so that it can be calibrated using generic dimensioning and be used in all parts of the aircraft. 
         [0081]    Moreover, the present modular system, with the interconnection modules in particular, can be used in the context of the computing network of airborne systems by assembly in an integrated modular avionics architecture, known by the term IMA (the acronym for “Integrated Modular Avionics” in English terminology). 
         [0082]    Advantageously, the interconnection modules can be easily configurable (by CAD/CAM, by configuration matrix or equivalent) in order to meet the requirements of aircraft constructors.

Technology Category: 5