Connection housings for single-pair Ethernet cables and associated wired Ethernet networks

Abstract

A connection housing has a main pair and a secondary pair of electrical contacts on a printed circuit board (22), each pair having a first (24.sub.1, 24.sub.2) and a second (25.sub.1, 25.sub.2) electrical contact. A first set (26.sub.1) of conductive tracks electrically couples the first contacts of the main (23.sub.1) and secondary (23.sub.2) pairs, and a second set (26.sub.2) of tracks electrically couples the second contacts of the main and secondary pairs. The contacts of the main pair are two perforation or insulation displacement contacts receiving transversally and directly connecting two insulated conductors of a same main single-pair Ethernet cable (1a) entering and exiting from the housing through two main ways (27.sub.1, 27.sub.2) for access to the housing. The contacts of the secondary pair (23.sub.2) electrically connect two insulated conductors of a same secondary Ethernet cable (1b) linked through a secondary way (27.sub.3) for access to the housing.

Claims

1. A connection housing for single-pair Ethernet cables, said connection housing comprising: a base and a removable cover delimiting with the base an internal housing; at least one printed circuit board extending in the internal housing parallel to the base; at least one main pair of electrical contacts and a first secondary pair of electrical contacts borne by said at least one printed circuit board, each pair of electrical contacts comprising a first electrical contact and a second electrical contact; a first set of conductive tracks borne by said at least one printed circuit board and electrically coupling the first electrical contacts of the first main pair and of the first secondary pair, and a second set of conductive tracks borne by said at least one printed circuit board and electrically coupling the second electrical contacts of the first main pair and of the first secondary pair; and a first and a second main way for access to the housing, and a first secondary way for access to the housing, wherein the first and the second electrical contacts of the first main pair are two perforation or insulation displacement contacts extending at right angles above said at least one printed circuit board and configured to transversely receive and directly electrically connect two insulated conductors of a same main single-pair Ethernet cable entering and exiting from the housing by the two main ways for access to the housing, said connection housing further comprising a first and a second metal connection element borne by and extending at right angles above said at least one printed circuit board, each first and second metal connection element being positioned between a main access way and said first main pair of perforation or insulation displacement contacts, wherein each first and second metal connection element forms a cradle to transversely receive said main single-pair Ethernet cable, and in that the connection housing further comprises an additional set of conductive tracks borne by said at least one printed circuit board and electrically coupling together the metal connection elements, and in that said at least one printed circuit board further bears an impedance matching circuit with passive elements linked between the first set and the second set of conductive tracks.

2. The connection housing according to claim 1, wherein the first and the second electrical contacts of the first secondary pair are in the form of a connector capable of cooperating with a connector provided at an end of said secondary Ethernet cable.

3. The connection housing according to claim 1, wherein the first and the second electrical contacts of the first secondary pair are two perforation or insulation displacement contacts extending at right angles above said at least one printed circuit board, so as to transversally receive and directly electrically connect the two insulated conductors of said secondary Ethernet cable, said connection housing comprising a third metal connection element borne by and extending at right angles above said at least one printed circuit board, and electrically coupled to the additional set of conductive tracks, said third metal connection element being positioned between the first secondary access way and the first secondary pair of perforation or insulation displacement contacts and forming a cradle to transversely receive said secondary Ethernet cable.

4. The connection housing according to claim 1, comprising a second main pair of electrical contacts between the first main pair of electrical contacts and the second metal connection element, the first and the second electrical contacts of the second main pair being two perforation or insulation displacement contacts extending at right angles above said at least one printed circuit board, the contacts of the two main pairs being configured to transversely receive and directly electrically connect two insulated conductors of two discontinuous segments of said same main single-pair Ethernet cable entering and exiting respectively through the first main way and the second main way.

5. The connection housing according to claim 4, wherein the sets of conductive tracks are borne by a face of said at least one printed circuit board opposite that bearing the perforation or insulation displacement contacts.

6. The connection housing according to claim 4, wherein the first electrical contact of the second main pair is coupled electrically to the first set of conductive tracks, and the second electrical contact of the second main pair is coupled electrically to the second set of conductive tracks.

7. The connection housing according to claim 6, wherein said impedance matching circuit with passive elements is associated with each pair of perforation or insulation displacement contacts.

8. The connection housing according to claim 6, wherein said at least one printed circuit board further bears a circuit forming a bus termination load, connected in series with the first set and the second set of conductive tracks, and in that the connection housing comprises a metal part secured mechanically to the second metal connection element, said metal part being configured to deactivate, respectively activate, the circuit forming the termination load according to whether a cable is present, respectively not present, in the cradle formed by the second metal connection element.

9. The connection housing according to claim 4, comprising a second secondary pair of electrical contacts borne by said at least one printed circuit board and comprising a first electrical contact and a second electrical contact, a third set of conductive tracks borne by said at least one printed circuit board and electrically coupling the first electrical contacts of the second main pair and of the second secondary pair, and a fourth set of conductive tracks borne by said at least one printed circuit board and electrically coupling the second electrical contacts of the second main pair and of the second secondary pair.

10. The connection housing according to claim 9, wherein said at least one printed circuit board further bears a second impedance matching circuit with passive elements linked between the third set and the fourth set of conductive tracks.

11. The connection housing according to claim 10, wherein the sets of conductive tracks are borne by a face of said at least one printed circuit board opposite that bearing the perforation or insulation displacement contacts.

12. The connection housing according to claim 9, comprising a second secondary way for access to the housing, and wherein the first and the second electrical contacts of the first secondary pair and of the second secondary pair are configured to electrically connect two insulated conductors to the respective ends of a same secondary single-pair Ethernet cable linked to the first and the second secondary ways to form a bypass loop.

13. A wired Ethernet network comprising: a main single-pair Ethernet cable comprising, inside an outer insulating sheath, a pair of insulated conductors capable of transmitting data and power, said main cable having its two ends linked respectively between a source of data and of power and a termination; at least one device capable of receiving the data and the power from the main single-pair Ethernet cable; and a secondary single-pair Ethernet cable comprising, inside an outer insulating sheath, a pair of insulated conductors capable of transmitting data and power, a first end of the secondary cable being connected electrically to said device; wherein said wired Ethernet network comprises a first connection housing according to claim 1, connected in the network such that said main single-pair Ethernet cable enters and exits from the first connection housing respectively through the first and the second main ways for access to the first housing, by being received transversely by the cradle of the first and of the second metal connection elements, the two insulated conductors of the main single-pair Ethernet cable being electrically connected with the first and the second electrical contacts of the first main pair, and in that the two insulated conductors of the second end of said secondary single-pair Ethernet cable are linked electrically, through the first secondary way for access to the first housing, to the first and the second electrical contacts of the first secondary pair.

14. The wired Ethernet network according to claim 13, wherein the main single-pair Ethernet cable comprises, inside the insulating outer sheath, a shielding layer surrounding the two insulated conductors, and in that the main single-pair Ethernet cable is stripped of its insulating outer sheath in order for the shielding layer to be in contact with the cradles of the first and second metal connection elements of the first connection housing.

15. The wired Ethernet network according to claim 13, wherein the first connection housing includes a second main pair of electrical contacts between the first main pair of electrical contacts and the second metal connection element, the first and the second electrical contacts of the second main pair being two perforation or insulation displacement contacts extending at right angles above said at least one printed circuit board, the contacts of the two main pairs being configured to transversely receive and directly electrically connect two insulated conductors of two discontinuous segments of said same main single-pair Ethernet cable entering and exiting respectively through the first main way and the second main way, and in that the main single-pair Ethernet cable is cut into two discontinuous segments, the contacts of the first main pair receiving transversally and directly electrically connecting the two insulated conductors of the discontinuous segment entering through the first main way and the contacts of the second main pair receiving transversely and directly electrically connecting the two insulated conductors of the discontinuous segment exiting through the second main way.

16. The wired Ethernet network according to claim 15, wherein said termination is produced by a second connection housing, wherein in said second connection housing, said at least one printed circuit board further bears a circuit forming a bus termination load, connected in series with the first set and the second set of conductive tracks, and in that the connection housing comprises a metal part secured mechanically to the second metal connection element, said metal part being configured to deactivate, respectively activate, the circuit forming the termination load according to whether a cable is present, respectively not present, in the cradle formed by the second metal connection element, of which the circuit forming the termination load is activated.

17. The wired Ethernet network comprising: a main single-pair Ethernet cable comprising, inside an outer insulating sheath, a pair of insulated conductors capable of transmitting data and power, said main cable having its two ends linked respectively between a source of data and of power and a termination; at least one device capable of receiving the data and the power from the main single-pair Ethernet cable; and a secondary single-pair Ethernet cable comprising, inside an outer insulating sheath, a pair of insulated conductors capable of transmitting data and power, a first end of the secondary cable being connected electrically to said device; wherein said wired Ethernet network comprises a first connection housing according to claim 1, a second secondary single-pair Ethernet cable comprising, inside an outer insulating sheath, a pair of insulated conductors capable of transmitting data and power, and a second connection housing having a second secondary way for access to the housing, and wherein the first and the second electrical contacts of the first secondary pair and of the second secondary pair are configured to electrically connect two insulated conductors to the respective ends of a same secondary single-pair Ethernet cable linked to the first and the second secondary ways to form a bypass loop, connected in the network such that: the first and the second electrical contacts of the first main pair and of the second main pair of the second connection housing are directly electrically connected to the two insulated conductors of two discontinuous segments of said main single-pair Ethernet cable entering and exiting respectively through the first main way and the second main way of said second housing; the first and the second electrical contacts of the first secondary pair and of the second secondary pair of the second connection housing are directly electrically connected to the two insulated conductors at the respective ends of said second secondary single-pair Ethernet cable through the first and the second secondary ways so as to form a bypass loop; said bypass loop enters and exits from the first connection housing respectively through the first and the second main ways for access to the first housing, by being received transversely by the cradle of the first and of the second metal connection elements, the two insulated conductors of the bypass loop being electrically connected with the first and the second electrical contacts by the first main pair, and the two insulated conductors of the second end of said secondary single-pair Ethernet cable are linked electrically, through the first secondary way for access to the first housing, to the first and the second electrical contacts of the first secondary pair of the first housing.

18. The wired Ethernet network according to claim 17, wherein the main single-pair Ethernet cable comprises, inside the outer insulating sheath, a shielding layer surrounding the two insulated conductors, and in that each discontinuous segment of the main single-pair Ethernet cable is stripped of its sheath in order for the shielding layer to be in contact with the cradle of the first or of the second metal connection elements of the second connection housing.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0028] The description which follows in light of the attached drawings, given as nonlimiting examples, will give a good understanding of what the invention consists of and how it can be produced. In the attached figures:

[0029] FIG. 1 illustrates a single-pair shielded Ethernet cable;

[0030] FIG. 2 schematically illustrates a connection housing according to a first embodiment according to the invention;

[0031] FIG. 3 schematically represents the electrical connections for the elements internal to the housing of FIG. 2;

[0032] FIG. 4 schematically illustrates a variant of a connection housing according to the first embodiment according to the invention;

[0033] FIG. 5 schematically represents the electrical connections for the elements internal to the housing of FIG. 4;

[0034] FIG. 6 illustrates an example of connection of an IoT device to a main single-pair cable according to a first possible implementation using the connection housing according to the first embodiment according to the invention;

[0035] FIG. 7 illustrates a partial view of another variant embodiment of a connection housing according to the first embodiment according to the invention;

[0036] FIG. 8 illustrates another partial view of the housing of FIG. 7 and an enlarged detail of this view;

[0037] FIG. 9 schematically illustrates the electrical connections for elements internal to a connection housing according to a second embodiment according to the invention;

[0038] FIG. 10 illustrates an example of connection of an IoT device to a main single-pair cable according to a third possible embodiment using a connection housing according to the first embodiment and a connection housing according to the second embodiment according to the invention;

[0039] FIG. 11 illustrates three examples of Ethernet networks with single-pair cables using the connection housing in its different embodiments according to the invention.

DESCRIPTION OF EMBODIMENTS

[0040] In the figures, the elements that are identical or equivalent will bear the same reference symbols. The various diagrams are not to scale.

[0041] The different figures represent the invention applied to the nonlimiting case in which all the Ethernet cables used are single-pair shielded cables.

[0042] Referring to FIG. 1, such a single-pair shielded Ethernet cable 1 conventionally comprises two conductors 10. Each conductor 10 is insulated and conventionally comprises a wire or a central core 11 of several wires, for example made of copper, surrounded concentrically with a layer of insulation 12 over the entire length of the conductor. The pair of conductors 10, preferably twisted, is surrounded concentrically over its entire length by a shielding layer 13, for example in the form of a screen or a metal braid. The assembly is conventionally protected by an insulating sheath 14 forming the outer jacket of the cable 1. The construction of the cable 1 represented in FIG. 1 is the same for all the cables 1a, 1b or 1c which will be described hereinbelow.

[0043] An exemplary realization of a connection housing 2 according to a first embodiment of the invention will now be described with reference to FIGS. 2 and 3.

[0044] The housing 2 comprises a base 20 and a removable cover 21. The removable cover 21 delimits, with the base 20, an internal housing inside which at least one printed circuit board 22 extends parallel to the base 20.

[0045] Said at least one printed circuit board 22 bears at least one first main pair 23.sub.1 of electrical contacts and a first secondary pair 23.sub.2 of electrical contacts (see FIG. 3). Each pair of electrical contacts comprises a first electrical contact 24.sub.1, 24.sub.2 and a second electrical contact 25.sub.1, 25.sub.2.

[0046] Said at least one printed circuit board 22 also bears a first set 26.sub.1 of conductive tracks and a second set 26.sub.2 of conductive tracks (see FIG. 3). The first set 26.sub.1 of conductive tracks electrically couples the first electrical contacts 24.sub.1, 24.sub.2 of the first main pair 23.sub.1 and of the first secondary pair 23.sub.2. The second set 26.sub.2 of conductive tracks electrically couples the second electrical contacts 25.sub.1, 25.sub.2 of the first main pair 23.sub.1 and of the first secondary pair 23.sub.2.

[0047] The connection housing 2 further comprises three ways for access to the housing, namely a first main way 27.sub.1 and a second main way 27.sub.2 for access to the housing, and a secondary way 27.sub.3 for access to the housing. Preferably, the two main ways 27.sub.1 and 27.sub.2 for access to the housing 2 are substantially aligned with the first main pair 23.sub.1 of electrical contacts, and the secondary way 27.sub.3 for access to the housing is substantially aligned with the first secondary pair 23.sub.2 of electrical contacts. Each of the three ways 27.sub.1 to 27.sub.3 can be produced in the form of an opening passing through a wall of the base 20, or, as schematically represented in FIG. 2, an opening passing through a wall of the removable cover 21. In a variant that is not represented, the removable cover 21 and the base 20 can have walls that cooperate together to form the three access ways.

[0048] According to the invention, at least the first and the second electrical contacts 24.sub.1, 25.sub.1 of the first main pair 23.sub.1 are two perforation or insulation displacement contacts extending at right angles above said at least one printed circuit board 22 and configured to transversely receive and directly electrically connect two insulated conductors of a same cable, such as the single-pair Ethernet cable 1a represented in FIGS. 2 and 3, which enters into the housing 2 through the first main way 27.sub.1 and which exits from the housing 2 without discontinuity through the second main way 27.sub.2.

[0049] A perforation or insulation displacement contact is a self-stripping contact that makes it possible to establish, very simply, with or without specific tools, an electrical contact with the conductive core of an insulated conductor. In the nonlimiting variants represented in the figures, the contacts are insulation displacement contacts which conventionally comprise a metal blade in the form of a U, the base of which rests on the printed circuit board 22, and of which the branches of the U transversely receive an insulated conductor and laterally exert a pressure on the conductor so as to cut the insulating layer and establish the electrical contact. The insulation displacement contacts can be replaced by insulation perforation contacts.

[0050] Said at least one printed circuit board 22 also bears a first metal connection element 28.sub.1 and a second metal connection element 28.sub.2 which extend at right angles above said at least one printed circuit board 22. The first metal connection element 28.sub.1 is positioned, preferably in alignment, between the first main access way 27.sub.1 and said first main pair 23.sub.1 of perforation or insulation displacement contacts. The second metal connection element 28.sub.2 is positioned, preferably in alignment, between the second main access way 27.sub.2 and this same first main pair 23.sub.1 of perforation or insulation displacement contacts. Each metal connection element 28.sub.1, 28.sub.2 forms a cradle to transversely receive the main cable 1a, as visible in FIG. 2.

[0051] Said at least one printed circuit board 22 also bears an additional set 26.sub.3 of conductive tracks which electrically couples together the metal connection elements 28.sub.1, 28.sub.2. The three sets 26.sub.1 to 26.sub.3 of conductive tracks are preferably borne by a face of said at least one printed circuit board 22 opposite that bearing the perforation or insulation displacement contacts and the metal connection elements, the electrical connection being made conventionally by metallized vias passing through the printed circuit board or any equivalent means.

[0052] The two main ways 27.sub.1 and 27.sub.2 are preferably borne by a first and a second opposite face of the housing 2 and the secondary way 27.sub.3 is then borne by a third face contiguous to the first and second faces. That makes it possible to optimize the tracks by producing conductive tracks in the form of a T for each of the first and second sets 26.sub.1 and 26.sub.2 of tracks.

[0053] In the nonlimiting example represented in FIGS. 2 and 3, the first and the second electrical contacts 24.sub.2, 25.sub.2 of the first secondary pair 23.sub.2 are also two perforation or insulation displacement contacts extending at right angles above said at least one printed circuit board 22, transversely receiving and electrically connecting two insulated conductors situated at an end of a secondary single-pair Ethernet cable, such as the secondary cable 1b of FIG. 2 entering through the secondary access way 27.sub.3. Said at least one printed circuit board 22 also bears a third metal connection element 28.sub.3 extending at right angles above said at least one printed circuit board 22, and coupled electrically to the third set 26.sub.3 of conductive tracks, said third metal connection element 28.sub.3 being positioned, preferably in alignment, between the secondary access way 27.sub.3 and said first secondary pair 23.sub.2 of perforation or insulation displacement contacts. In a way similar to the first and second metal connection elements 28.sub.1, 28.sub.2, the third metal connection element 28.sub.3 forms a cradle to transversely receive an end of the secondary cable 1b.

[0054] As can be seen in FIG. 3, which schematically represents the electrical connections on the bottom face of the board 22, said at least one printed circuit board 22 further preferably bears two impedance matching circuits 29.sub.1, 29.sub.2 with passive elements, the first circuit 29.sub.1 being linked between the first set 26.sub.1 and the second set 26.sub.2 of conductive tracks and associated with the first main pair 23.sub.1 of perforation or insulation displacement contacts, the second circuit 29.sub.2 being linked between the first set 26.sub.1 and the second set 26.sub.2 of conductive tracks and associated with the first secondary pair 23.sub.2 of perforation or insulation displacement contacts. These two circuits bear the single reference 29 in the example of FIG. 8. These impedance matching circuits 29.sub.1 and 29.sub.2 make it possible to obtain a controlled impedance corresponding to the cables 1a and 1b used, for example of 100 Ohms.

[0055] In a variant that is not represented, the first and the second electrical contacts 24.sub.2, 25.sub.2 of the first secondary pair 23.sub.2 could be produced in the form of a connector capable of cooperating with a connector provided at an end of said secondary single-pair Ethernet cable 1b. In this case, the second impedance matching circuit 29.sub.2 is not necessarily essential.

[0056] A variant realization of the connection housing 2 according to the first embodiment according to the invention will now be described with reference to FIGS. 4 and 5.

[0057] This other variant differs from that described above with reference to FIGS. 2 and 3 only in that the housing 2 comprises a second main pair 23.sub.3 of electrical contacts (see FIG. 5), preferably substantially aligned between the first main pair 23.sub.1 of electrical contacts and the second metal connection element 28.sub.2, the first and the second electrical contacts 24.sub.3, 25.sub.3 of the second main pair 23.sub.3 being two perforation or insulation displacement contacts extending at right angles above said at least one printed circuit board 22 and configured to transversely receive and directly electrically connect two insulated conductors of said same main single-pair Ethernet cable 1a. In this variant, the main Ethernet cable 1a must be received with discontinuity, as represented in FIG. 4. Thus, the main cable 1a is cut between the first pair 23.sub.1 and the third pair 23.sub.3 so as to obtain two discontinuous segments of this main single-pair Ethernet cable 1a, one entering through the first main way 27.sub.1 and the other exiting through the second main way 27.sub.2. The insulated conductors of the free end of the first segment are thus received by the two contacts 24.sub.1 and 25.sub.1 of the first main pair 23.sub.1, while the same insulated conductors of the free end of the second segment are received by the two contacts 24.sub.3 and 25.sub.3 of the second main pair 23.sub.3. In this case, said printed circuit board 22 further preferably bears a third impedance matching circuit 29.sub.3 with passive elements, linked between the first set 26.sub.1 and the second set 26.sub.2 of conductive tracks and associated with the second main pair 23.sub.3 of perforation or insulation displacement contacts (see FIG. 5).

[0058] In the two preceding variants, the main cable 1a or each of the two discontinuous segments of this main cable (when the latter is cut) is partially stripped, on the one hand, of its insulating sheath (14 in FIG. 1) and of its shielding layer (13 in FIG. 1) over a portion intended to be received by the first or the second main pair in order for each of its two insulated conductors (10 in FIG. 1) to be able to be received in its associated perforation or insulation displacement contact, and, on the other hand, of its insulating sheath only over its portion intended to be received by the metal elements, in order for its shielding layer to be received in the cradle of the first 28.sub.1 or of the second 28.sub.2 metal connection elements of the connection housing 2. These different connection elements and the third set 26.sub.3 of tracks thus make it possible to connect the shielding layer 13 of the main cable 1a to an electrical ground.

[0059] In the case where the first secondary pair 23.sub.2 also comprises perforation or insulation displacement contacts 24.sub.2 and 25.sub.2, the housing 2 can receive, by the secondary access way 27.sub.3, an end not provided with a connector of the secondary cable 1b. Here again, this end must be previously partially stripped, on the one hand, of its insulating sheath and of its shielding layer over a portion intended to be received by the second pair 23.sub.2 in order for each of its two insulated conductors to be able to be received in its associated perforation or insulation displacement contact, and, on the other hand, of its sheath only over its portion intended to be received by the metal connection element 28.sub.3, in order for its shielding layer to be received in the cradle formed by this metal connection element 28.sub.3.

[0060] It should be noted that the connection housing 2 described in its different variants above can also be used to connect a single-pair main cable 1a and a single-pair secondary cable 1b which are both unshielded. In this case, the metal connection elements 28.sub.1 to 28.sub.3 have the sole function of ensuring that the cables are well secured mechanically inside the housing 2.

[0061] FIG. 6 illustrates a first way of using the connection housing 2 described above. In this FIG. 6, a main single-pair Ethernet cable 1a is represented, constituting the main bus of a wired Ethernet network. The connection housing 2 is grafted onto this main cable 1a as explained above, either without discontinuity (variant of the housing 2 according to FIG. 2), or after having cut the main cable 1a into two discontinuous segments (variant of the housing 2 according to FIG. 4). For this, the removable cover 21 of the connection housing 2 is removed from the base 20 so as to be able to run the main cable 1a through the two main ways 27.sub.1 and 27.sub.2, or, when the main cable 1a has been cut, so as to have the first discontinuous segment enter through the first main access way 27.sub.1 and the second discontinuous segment exit through the second main access way 27.sub.2. If the main cable 1a is a shielded cable, this cable 1a (or each end of the discontinuous segments of this main cable 1a) is stripped of its outer sheath and of its shielding layer over a portion of sufficient length to expose the two insulated conductors which are placed respectively in the perforation or insulation displacement contacts of the first main pair 23.sub.1 and of the second main pair 23.sub.3. The perforation or insulation displacement contacts are then actuated to perforate the insulating layer of each conductor and establish the electrical connection with the copper wires of these conductors. Furthermore, this cable 1a (or each end of the discontinuous segments of this main cable 1a) is stripped of its outer sheath only over a portion of sufficient length to expose its shielding layer. The latter is then received transversely by and in contact with the cradle formed by the associated metal connection element 28.sub.1 and 28.sub.2. An IoT device 3 is connected to the network via a secondary single-pair cable 1b of which a first end is connected to the device 3, for example via a dedicated connector 15 with which this first end is equipped, and the second end of this secondary cable 1b entering into the housing through the secondary access way to be directly connected to the first secondary pair 23.sub.2 of the housing. If the housing 2 is according to one of the variants represented in FIGS. 2 to 5, the second end of the secondary cable 1b has no connector and must be stripped of its sheath and of its shielding layer over a portion of sufficient length to expose the two insulated conductors of the secondary cable 1b which are placed respectively in the perforation or insulation displacement contacts of the first secondary pair 23.sub.2. Furthermore, the second end of this secondary cable 1b is also stripped of its outer sheath so as to expose its shielding layer. The latter is then received transversely by and in contact with the cradle formed by the associated metal connection element 28.sub.3.

[0062] FIGS. 7 and 8 illustrate a very interesting variant of the connection housing 2 of FIGS. 4 and 5. In this variant, the printed circuit board 22 bears a circuit 29.sub.4 forming a bus termination load connected in series with the first set 26.sub.1 and the second set 26.sub.2 of conductive tracks. A metal part 28′.sub.2 secured mechanically to the second metal connection element 28.sub.2 deactivates, respectively activates, this circuit 29.sub.4 forming the termination load, depending on whether a segment of the main cable 1a is present, respectively not present, in the cradle formed by the second metal connection element 28.sub.2. The mechanical link between the metal connection element 28.sub.2 and the metal part 28′.sub.2 can be a translation, as represented by the double arrow in FIG. 8. FIG. 8 illustrates the case where a segment of cable 1a is present in the cradle 28.sub.2, such that the circuit 29.sub.4 forming the termination load is deactivated. When no segment of cable 1a is present in the cradle 28.sub.2, the metal part 28′.sub.2 activates the circuit 29.sub.4 by linking the two sets 26.sub.1 and 26.sub.2 of conductive tracks. Thus, one and the same connection housing 2 according to this variant embodiment can be used either to connect an IoT device at any intermediate position of the main bus, or to connect an IoT device at the end of the main bus, in which case the housing 2 also ensures the termination of the bus.

[0063] As indicated above, in order to comply with the standard, the length of the secondary cable 1b of FIG. 6 cannot exceed 15 cm, which can complicate installation when there is no place to position an IoT device 3 close to the main cable 1a.

[0064] To resolve this problem, a second embodiment of a connection housing 4 for single-pair Ethernet cables, and its joint use with the connection housing 2 according to the first embodiment described above, will now be described in relation to FIGS. 9 and 10.

[0065] In a way similar to the connection housing 2, the housing 4 according to this second embodiment comprise a base 40 and a removable cover 41 delimiting, with the base 40, an internal housing, and at least one printed circuit board 42 extending in the internal housing parallel to the base 40.

[0066] Said at least one printed circuit board 42 here bears a first main pair 43.sub.1 of electrical contacts, a first secondary pair 43.sub.2 of electrical contacts, a second main pair 43.sub.3 of electrical contacts and a second secondary pair 43.sub.4 of electrical contacts, each pair of electrical contacts comprising a first electrical contact 44.sub.1, 44.sub.2, 44.sub.3, 44.sub.4 and a second electrical contact 45.sub.1, 45.sub.2, 45.sub.3, 45.sub.4.

[0067] Said at least one printed circuit board 42 further bears a first set 46.sub.1 of conductive tracks electrically coupling the first electrical contacts 44.sub.1, 44.sub.2 of the first main pair 43.sub.1 and of the first secondary pair 43.sub.2, a second set 46.sub.2 of conductive tracks electrically coupling the second electrical contacts 45.sub.1, 45.sub.2 of the first main pair 43.sub.1 and of the first secondary pair 43.sub.2, a third set 46.sub.3 of conductive tracks electrically coupling the first electrical contacts 44.sub.3, 44.sub.4 of the second main pair 43.sub.3 and of the second secondary pair 43.sub.4, and a fourth set 46.sub.4 of conductive tracks electrically coupling the second electrical contacts 45.sub.3, 45.sub.4 of the second main pair 43.sub.3 and of the second secondary pair 43.sub.4.

[0068] The connection housing 4 further comprises two main access ways, namely a first main way 47.sub.1 for access to the housing and a second main way 47.sub.2 for access to the housing, and two secondary access ways, namely a first secondary way 47.sub.3 for access to the housing and a second secondary way 47.sub.4 for access to the housing. The first main way 47.sub.1 for access to the housing is preferably substantially aligned with the first main pair 43.sub.1 of electrical contacts. The second main way 47.sub.2 for access to the housing is preferably substantially aligned with the second main pair 43.sub.3 of electrical contacts. The first secondary way 47.sub.3 for access to the housing is preferably substantially aligned with the first secondary pair 43.sub.2 of electrical contacts. Finally, the second secondary way 47.sub.4 for access to the housing is preferably substantially aligned with the second secondary pair 43.sub.4 of electrical contacts.

[0069] In a way similar to the connection housing 2, and in accordance with the invention, the first and the second electrical contacts of the pairs associated with the main ways, namely of the first main pair 43.sub.1 and of the second main pair 43.sub.3, are two perforation or insulation displacement contacts extending at right angles above said at least one printed circuit board 42 and configured to transversely receive and electrically connect two insulated conductors of two discontinuous segments of a same main single-pair Ethernet cable 1a entering and exiting respectively through the first main way 47.sub.1 and the second main way 47.sub.2.

[0070] Said at least one printed circuit board 42 further bears a first metal connection element 48.sub.1 and a second metal connection element 48.sub.2 which extend at right angles above said at least one printed circuit board. The first metal connection element 48.sub.1 is positioned, preferably in alignment, between the first main access way 47.sub.1 and the first main pair 43.sub.1 of perforation or insulation displacement contents. The second metal connection element 48.sub.2 is positioned preferably in alignment between the second main access way 47.sub.2 and the second main pair 43.sub.3 of perforation or insulation displacement contacts. These connection elements are identical to the metal connection elements 28.sub.1 to 28.sub.3 of the connection housing 2, and consequently form a cradle to transversely receive the two discontinuous segments of the main cable 1a. An additional set 46.sub.5 of conductive tracks, borne by said at least one printed circuit board 42, electrically couples together the metal connection elements 48.sub.1, 48.sub.2.

[0071] The sets 46.sub.1 to 46.sub.5 of conductive tracks are preferably borne by a face of said at least one printed circuit board 42 opposite that bearing the perforation or insulation displacement contacts and the metal connection elements, the electrical connection being made conventionally by metallized vias passing through the printed circuit board or any equivalent means.

[0072] The first and the second electrical contacts of the first secondary pair 43.sub.2 and of the second secondary pair 43.sub.4 are configured, for their part, to electrically connect two insulated conductors to the respective ends of a same secondary single-pair Ethernet cable 1c linked through the first and the second secondary ways 47.sub.3, 47.sub.4 to form a bypass loop 16.

[0073] In the nonlimiting example of FIG. 9, the first 44.sub.2, 44.sub.4 and the second 45.sub.2, 45.sub.4 electrical contacts of the first secondary pair 43.sub.2 and of the second secondary pair 43.sub.4 are also perforation or insulation displacement contacts extending at right angles above said at least one printed circuit board 42, so as to transversely and directly electrically connect the two insulated conductors to the ends of the bypass loop 16, and the housing 4 consequently comprises a third 48.sub.3 and a fourth 48.sub.4 metal connection element borne by and extending at right angles above said at least one printed circuit board 42, and coupled electrically to the additional set 46.sub.5 of conductive tracks, the third 48.sub.3, respectively the fourth 48.sub.4, metal connection element being positioned, preferably in alignment, between the first 47.sub.3, respectively the second 47.sub.4, secondary access way and the first 43.sub.2, respectively the second 43.sub.4, associated secondary pair of perforation or insulation displacement contacts and forming a cradle to transversely receive the ends of the secondary single-pair cable 1c forming the bypass loop 16.

[0074] In a variant that is not represented, the first 44.sub.2, 44.sub.4 and the second 45.sub.2, 45.sub.4 electrical contacts of the first secondary pair 43.sub.2 and of the second secondary pair 43.sub.4 could be produced in the form of connectors capable of cooperating with a connector provided at each end of said secondary single-pair Ethernet cable 1c.

[0075] As can be seen in FIG. 9, which schematically represents the electrical connections on the bottom face of the printed circuit board 42, said at least one printed circuit board 42 further preferably bears a first impedance matching circuit 49.sub.1 with passive elements linked between the first set 46.sub.1 and the second set 46.sub.2 of conductive tracks, and a second impedance matching circuit 49.sub.2 with passive elements linked between the third set 46.sub.3 and the fourth set 46.sub.4 of conductive tracks. Here again, these circuits 49.sub.1 and 49.sub.2 make it possible to obtain a controlled impedance corresponding to the cables 1a and 1c linked to the connection housing 4, for example an impedance of 100 Ohms.

[0076] Thus, in a way similar to what was described with reference to FIG. 6, here it is the connection housing 4 which is grafted onto the main cable 1a constituting the main bus of an Ethernet network, after having cut this main cable 1a into two discontinuous segments. For this, the removable cover 41 of the connection housing 4 is removed from the base 40 so as to have the first discontinuous segment of the cut main cable 1a enter through the first main access way 47.sub.1 and the second discontinuous segment of the cut main cable 1a exit through the second main access way 47.sub.2. If the main cable 1a is a shielded cable, each end of the discontinuous segments of this main cable 1a is stripped of its outer sheath and of its shielding layer over a portion of sufficient length to expose the two insulated conductors which are placed respectively in the perforation or insulation displacement contacts of the first main pair 43.sub.1 and of the second main pair 43.sub.3. The perforation or insulation displacement contacts are then actuated to perforate the insulating layer of each conductor and establish the electrical connection with the copper wires of these conductors. Furthermore, each end of the discontinuous segments of this main cable 1a is stripped of its outer sheath only over a portion of sufficient length to expose its shielding layer. The latter is then received transversely by and in contact with the cradle formed by the associated metal connection element 48.sub.1 and 48.sub.2. The same procedure is applied to connect the two ends of the secondary cable 1c forming the bypass loop to the two other secondary pairs 43.sub.2 and 43.sub.4 of contacts.

[0077] The assembly obtained (bypass loop 16 linked to the connection housing 4, itself linked to the main cable 1a) is used advantageously in association with the connection housing 2 according to the first embodiment, as represented in Figure in order to solve the situation in which the device 3 is situated at more than cm from the main cable 1a. Here, the connection housing 2 (to which the device 3 is linked by the single-pair secondary cable 1b) is not grafted onto the main cable 1a, but onto the bypass loop 16. For example, the first and the second electrical contacts 24.sub.1, 25.sub.1 of the first main pair 23.sub.1 of the connection housing 2 are in direct electrical connection with the two insulated conductors of said bypass loop 16 entering and exiting from the connection housing 2 through its two main ways 27.sub.1 for access to the connection housing 2.

[0078] Other variant productions of a housing 4 according to the second embodiment of the invention can be envisaged. For example, a single secondary way for access to the housing 4 could be envisaged, instead of the two secondary access ways 47.sub.3 and 47.sub.4 of FIG. 9. In this case, the secondary cable 1c can be a cable comprising two pairs, one for connection to the first secondary pair 43.sub.2, the other for connection to the second secondary pair 43.sub.4. The housing 2 must then be adapted for it to be able to be connected to this two-pair cable.

[0079] As nonlimiting examples, the views (a) to (c) of FIG. 11 illustrate different wired Ethernet networks using the three-way connection housing, even the connection housing 4 (bypass) that are the subjects of the invention. For each view (a) to (c), the wired Ethernet network comprises a main single-pair Ethernet cable 1a (shielded or not) forming a main bus linking a source of data and of power 5 to a termination.

[0080] In the case of the view (a), two connection housings 2 according to the first embodiment of the invention are grafted onto the main cable 1a in two intermediate positions of the cable and are used to each directly connect an IoT device 3 via a secondary cable 1b. The termination is made by a dedicated device 6.

[0081] The network of the view (b) differs from that of the view (a) in that the termination is produced via a connection housing 2 according to the variant described with reference to FIGS. 7 and 8, being also used to directly connect an additional IoT device 3 via a secondary cable 1b.

[0082] The network of the view (c) differs from that of the view (b) in that one of the three-way connection housings 2 has been replaced by a connection housing 4 according to the second embodiment of the invention, and that the corresponding device 3 is connected to a connection housing 2 which, in turn, is grafted onto the bypass loop 16 connected to the connection housing 4, via a connection housing 2 according to the first embodiment, as described with reference to FIG. 10.

[0083] In all the cases, the fact of providing housings 2 or 4 of the invention, provided with pairs of perforation or insulation displacement contacts and configured to be grafted onto the single-pair main cable 1a, makes it possible to easily add IoT devices. The networks and housings can be adapted for example to operate up to frequencies of 200 MHz, on a transmission channel of type T1-M-A-25 and/or T1-M-A-50 defined by ISO/IEC JTC SC25.