DE29817547U1 - Subscriber or multimedia junction box - Google Patents

Description

345 G222

Subscriber or multimedia connection socket
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The invention relates to a subscriber or multimedia connection socket according to the preamble of claim 1.

In the traditional sense, subscriber connection sockets are antenna sockets with two, three or four outputs, at which radio, TV and/or satellite signals are made available. The signals can be supplied via satellite systems or a broadband communication network, for example. The current generation of subscriber connection sockets, on the other hand, are intended to be suitable for cable modem operation as multimedia connection sockets, which is why they must have a special connection to ensure trouble-free operation when connecting a cable modem. Such a subscriber or multimedia connection socket can be designed as a single connection socket, a through socket or as a terminal socket. The TV output is usually

with an IEC plug, the radio output with an IEC socket and the cable modem connection with an F-plug.

Such a subscriber or multimedia connection box enables the connection and operation of end devices such as radio, TV, receiver, whereby the cable modem connection enables the transmission of return path signals using a cable modem. Such known connection boxes with three connections are usually designed in such a way that the connection for the TV signals is on the left in a middle equatorial plane and the connection for receiving the radio signals is on the right diametrically opposite to it on the circular box.

The third connection is provided between the two at the bottom (in the six o'clock position) and can be used for any signal, such as satellite TV or return path signals. With the increasing provision of bidirectional services via cable networks and the increasing acceptance of these services by subscribers, it is now necessary to replace the previous state-of-the-art connection sockets with so-called subscriber or multimedia connection sockets with special performance requirements.

Apart from the fact that an additional cable modem is required for a subscriber, this also means that the values for the decoupling between the connections of a subscriber connection box according to EN50083-4 and the values according to EN50083-7 regarding the decoupling between two connections

connection sockets are no longer sufficient, but that a higher level of decoupling is required between the cable modem and the TV connection. Interference levels of £40dB//V in the frequency range of <, 47 MHz lead to perceptible interference in the TV picture area and with a transmission level of e.g. 114α&Bgr;μgr;v for the cable modem, a decoupling requirement of at least 74 dB arises between the cable modem connection and the TV connection. In addition, the necessary immunity against ingress sources in the subscriber area must be ensured in the multimedia connection sockets by appropriate filtering of the TV and radio outputs.

The object of the present invention is therefore to create a subscriber or multimedia connection socket (modem connection socket) in which sufficient decoupling between the individual signal paths can be achieved with less effort than in the prior art.

0 This object is achieved according to the invention according to the features specified in claim 1 or 2. Advantageous embodiments of the invention are specified in the subclaims.

High frequency coupling can be reduced, for example, by shielded cables, chamber technology or similar complex measures. In the case of subscriber or multimedia connection sockets, this also means that with a sub-system that meets the new requirements of higher decoupling between the connections,

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subscriber connection box, it will no longer be possible or hardly possible to assemble the circuit board using SMD technology.

In contrast, the invention proposes that the conventional connection assignment for the subscriber socket be changed in such a way that, for example, the cable modem connection is provided instead of the radio connection at the point where the radio connection is usually provided (diametrically opposite the TV connection). The radio connection is now provided at the point where the third connection (for example a satellite connection) is usually provided at the bottom in the so-called "six o'clock position". It must be described as quite surprising that the connection assignment, which has been changed compared to the state of the art, enables a significant improvement in the decoupling of the individual connections, and this without any major additional circuitry or material expenditure.

According to the invention, the modified connection assignment results in an improvement in the layout design of the cable and signal paths (reduction in crossings, improvement of the cable spacing between the modem and TV/radio cables), whereby the desired 5 higher decoupling between the individual signal paths and connections can be achieved.

In order to achieve maximum interference and contact safety, the IEC-169-2 connector (in the form of a socket) for the cable modem connection is replaced by an IEC

16 9-24 connection in the form of a so-called F-connector.

In addition, suitable filtering (high-pass filter) in the subscriber connection socket (for example in the form of a loop-through or end socket) can further improve the decoupling between the cable modem connection and the TV/radio connections and increase immunity to ingress sources in the subscriber area.

By using a suitable filter (high/low pass filter) in the individual connection box, in addition to the advantages already achieved with the loop-through or end box mentioned above, the input return loss in the return path frequency range will also be improved.

The subscriber or multimedia connection socket according to the invention also has advantages over those subscriber connection sockets available on the market, in which only passive plug-in filters are provided in the subscriber area. Such passive plug-in filters for the subscriber area are not an alternative to such multimedia connection sockets because the network operator has no influence over whether the filters are actually used. The network operator therefore loses all control over the ingress level and thus over the reliability of the transmission in his network. Plug-in filters for the multi-tap also do not represent a solution to the ingress problem because their effectiveness decreases with increasing connection density of bidirectional subscribers.

decreases.

The invention is explained in more detail below using exemplary embodiments. In these:
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Figure 1: a plan view of a schematically represented multimedia connection box according to the invention ;

Figure 2: a plan view of a schematically represented multimedia connection box according to the invention in an embodiment modified from Figure 1;

Figure 3: a schematic diagram for clarification

the circuit structure of the multimedia connection box according to the invention in the case of a loop-through or end box;

Figure 4: a schematic diagram for a multimedia connection box according to the invention in the case of a single connection box;

Figure 5 : an embodiment modified from Figures 1 and 2; and

Figure 6: a further modified embodiment in schematic plan view.

' Figure 1 shows a schematic plan view of a

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Subscriber or multimedia connection box 1 is shown, which, as in most cases, is circular and thus cylindrical in plan view, although this is not important.
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In the embodiment shown, a TV connection 5 and a cable modem connection 7 are provided opposite one another on an imaginary center plane 3 or straight line 3', which cuts diagonally through the connection box 1 in the embodiment shown or runs through it.

Since the sockets are usually installed so that the center plane 3 is horizontal, the TV connection 5 is in the nine o'clock position and the cable modem connection 7 is in the three o'clock position.

In between, in the embodiment shown on a central transverse plane 9, which runs perpendicularly and centrally to the central plane 3, the radio connection 13 is now also preferably provided at the same radial distance from the center point 11 of the connection box. In the embodiment shown in Figure 1, this is in the so-called six o'clock position.

The embodiment according to Figure 2 differs from that in Figure 1 in that the radio connection 13 is not located at the bottom on the central transverse plane 9, but at the top, in the so-called twelve o'clock position.

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Due to this design, the distance between the TV connection 5 and the radio connection 13 is smaller than the distance between the TV connection 5 and the cable modem connection 7 .
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The position of the individual connections can also be described in such a way that, for example, in the embodiment according to Figure 1, the vertical projection 13' of the radio connection 13 onto the straight line 3' or central plane 3 laid through the TV connection 5 and the multimedia connection 7 lies spatially between the TV connection 5 and the multimedia connection 7. In other words, the projection 13' is defined as the intersection point of a straight line 3' laid through the TV connection 5 and the multimedia connection 7 and a central transverse plane 9 perpendicular to it, in which the radio connection 13 lies.

It is also noted that in both the embodiment according to Figure 1 and the embodiment according to Figure 2, for example, the TV connection 5 and the radio connection 13 can also be interchanged. Finally, the connections diametrically opposite in Figure 1 or Figure 2 in these embodiments, the TV connection 5 and the multimedia connection 7, can also be higher or lower in relation to the center of the connection box in relation to the center plane 3, as can the third connection, in the embodiment shown according to Figures 1 and 2, the radio connection 13, can also be further to the left or right in relation to the center transverse plane 9, and in Figure 1 also higher up to and including

the middle of the junction box (centre 11) or in the embodiment according to Figure 2 also in the upper half also up to the height of the central plane 3 or the straight line 3' lying there, as is shown only by way of example in Figures 5 and 6.

Preferably, the TV connection 5 is implemented using an IEC 169-2 plug, the radio connection 13 using an IEC 169-2 socket and the modem connection 7 using an IEC 169-24 connection in the form of a so-called F-connector.

Figure 3 shows a schematic diagram for the wiring of a multimedia connection box in the form of a loop-through or end box.

Two directional couplers 23 and 25 connected in series are provided on a transmission path 17 between an input 19 and an output 21, with a branch line 27 branching off from the directional coupler 23 connected closer to the input 19.

The branch line 27 is initially followed by a high-frequency filter 29 and a distributor 31, whereby a branch to the TV connection 5 and the radio connection 13 is made.

A branch line 33 also branches off from the second directional coupler 25 and leads to the cable modem connection 7.
30

From this schematic diagram alone it is clear that an overlap and crossing of the cable paths leading to the TV connection, the radio connection and the modem connection is strictly avoided, whereby the higher decoupling can be achieved with simple means.

According to the embodiment shown in Figure 4, a multimedia socket is shown as a single connection socket.

On a transmission path 17' there, a directional coupler 25" is placed after an input 19', from which in turn the branch line 33' branches off to the modem connection 7.

In the transmission path 17', a high/low pass filter 35 is connected downstream of the directional coupler, one branch of which is provided with a terminating resistor 37.

A distributor 31' is connected to the other output branch of the high-low pass filter 35, to one output of which the TV connection 5 is connected and to the other output of which the radio connection 13 is connected.

The last-mentioned embodiment also shows that the three lines for the cable modem connection, 5 the TV connection and the radio connection do not overlap or cross each other, which means that the improved coupling values can be achieved with simple means.

0 The subscriber or multimedia connection according to the invention

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socket can have a high degree of decoupling between the modem connection and the TV connection and/or the radio connection. The decoupling should preferably be equal to or greater than 60 dB, in particular greater than or equal to 70 dB. In the embodiment shown, it can be greater than or equal to 74 dB.

Claims (11)

345 G 222 Protection claims; 1. Subscriber or multimedia connection box, in particular as a single connection box, as a loop-through box or as a terminal box, which in addition to a TV connection (5) and a radio connection (13) has at least one multimedia or modem connection (7) to enable modem operation, characterized in that when the subscriber or multimedia connection box (1) is viewed from above, the radio connection (13) or its vertical projection (13') lies on a plane or straight line (3, 3 ¹ ) laid through the TV connection (5) and the multimedia or modem connection (7) between the TV connection (5) and the multimedia or modem connection (7). 2. Subscriber or multimedia connection socket, in particular as a single connection socket, as a loop-through socket or as a terminal socket, which in addition to a TV connection (5) and a radio connection (13) has at least one multimedia or modem connection (7) to enable modem operation Il It !SSt hi« · characterized in that when looking at the subscriber or multimedia connection box (1) from above, the TV connection (5) or its vertical projection (13') lies on a plane or straight line (3, 3') laid through the radio connection (13) and the multimedia or modem connection (7) between the radio connection (13) and the multimedia or modem connection (7). 3. Subscriber or multimedia connection box according to claim 1 or 2, characterized in that on a chord or straight line (3') passing through the connection box (1) and facing closer to the edge of the connection box, the TV connection (5) and at the other end of the chord or straight line (3 ' ) the multimedia or modem connection (7) is provided and that the radio connection (13) is provided transversely to the chord or straight line (3 ¹ ) offset on the connection box (1). 4. Subscriber or multimedia connection box according to claim 1 or 2, characterized in that the radio connection (13) is provided on a chord or straight line (3') passing through the connection box (1) and facing closer to the edge of the connection box and the multimedia or modem connection (7) is provided at the other end of the chord or straight line (3') and that the TV connection (5) is provided offset on the connection box (1) transversely to the chord or straight line (3 ^' ). 5. Subscriber or multimedia connection box according to one of claims 1 to 4, characterized in that the tendon or straight line (3') as a central plane (3) passing through the junction box (1). 6. Subscriber or multimedia connection box according to one of claims 1 to 5, characterized in that the radio connection (13) or the TV connection (5) are arranged on a central transverse plane (9) to the chord preferably formed in the form of a central plane (3). 7. Subscriber or multimedia connection box according to one of claims 1 to 6, characterized in that the multimedia or modem connection consists of an F-connector. 8. Subscriber or multimedia connection box according to one of claims 1 to 7, characterized in that, in particular in the case of a loop-through or end box, a distributor (31), one output of which is connected to the TV connection (5) and the other output of which is connected to the radio output (13), is preceded by a high-pass filter (29). 9. Subscriber or multimedia connection box according to one of claims 1 to 8, characterized in that, in particular in the case of a single connection box, a distributor (31 ¹ ), one output of which is connected to the TV connection (5) and the other output of which is connected to the radio connection (13), is connected upstream of a high/low pass filter (35), the low pass branch of which is connected by means of a terminating element (37) is completed. 10. Subscriber or multimedia connection box according to one of claims 1 to 9, characterized in that two directional couplers (23, 25) are connected in series in a transmission path (17) between an input (19) and an output (21), wherein one, in particular the first directional coupler (23), is at least indirectly connected to a distributor (31) and the second directional coupler (25) is connected to the multimedia or modem connection (7) via its branch line (33). 11. Subscriber or multimedia connection box according to one of claims 1 to 10, characterized in that the decoupling between the multimedia or modem connection (7) and the TV connection (5) and/or the radio connection (13) is greater than or equal to 60 dB, preferably greater than or equal to 70 dB.