CN221080324U - Multisystem access platform - Google Patents

Abstract

The utility model discloses a multi-system access platform, which comprises a first combiner, a second combiner and a bridge module, wherein the first combiner and the second combiner are provided with a plurality of input ports and an output port, and a partition wall is arranged between the first combiner and the second combiner and used for preventing signal interference among different systems; the bridge module comprises a bridge cavity, two bridge sheets are arranged in the bridge cavity in a staggered manner, signals of different systems are effectively combined and connected, the use of coaxial wires is avoided, and the volume of the multi-system access platform is effectively reduced; in addition, the through hole is arranged below the bridge cavity, at least one input port can pass through the through hole, so that the space utilization rate of the multi-system access platform is obviously improved, the arrangement of parts in the device is conveniently and compactly arranged, the size is reduced, the performance, the reliability and the integration degree of the multi-system access platform are improved, and the problem of insufficient miniaturization in the prior art is solved.

Description

Multisystem access platform

Technical Field

The utility model relates to the technical field of a combiner, in particular to a multi-system access platform.

Background

POI (POINT OF INTERFACE), namely a multisystem access platform, is used for multi-band and multi-signal combination and realizes multi-network signal compatible coverage. The traditional multi-system access platform is characterized in that a plurality of combiners which belong to different systems are connected to a bridge module through cables, and then signals are output.

The utility model patent with the application number 2020205453935 discloses a multi-system combining platform, as shown in fig. 1, which comprises: the broadband quadrature bridge 10, two first signal output ports (31, 32) and two combiners (21, 22). The two signal output ends of the broadband orthogonal bridge 10 are respectively and electrically connected with the two first signal output openings in a one-to-one correspondence manner. The phase balance in the passband of the broadband orthogonal bridge 10 is set to 80-100 degrees, and the amplitude balance is set to 2.2-3.8 dB. The combiner is provided with a second signal output port and a plurality of first signal input ports (41, 42, 43, 44). The first signal input ports (41, 42, 43, 44) are used for accessing high-frequency signals of a base station, the second signal output ports are electrically connected with two signal input ends of the broadband orthogonal bridge 10 in one-to-one correspondence, and the two combiners are symmetrically arranged with the center line of the broadband orthogonal bridge 10 and are positioned at one side of the broadband orthogonal bridge 10.

The utility model aims to realize the transparent transmission of low-frequency signals and the adaptive transmission of high-frequency signals, and integrates a combiner which belongs to a plurality of different systems into one device; however, the bridge module of the multi-system combining platform occupies a large part of the space of the platform, and the miniaturization degree is insufficient.

The invention patent application 2022114284959 discloses a multi-system access device, as shown in fig. 2, which includes: chassis 100, partition 200, bridge 300, first combiner 400, and second combiner; the chassis 100 includes a plurality of output ports and a plurality of input ports, the partition 200 is disposed in the chassis 100 and divides the chassis 100 into a first cavity and a second cavity, the first combiner 400 is disposed in the first cavity, and the second combiner is disposed in the second cavity; the output end of the first combiner 400 and the output end of the second combiner are respectively and electrically connected with the input end of the bridge 300, the output end of the bridge 300 is electrically connected with a plurality of output ports on the chassis 100, the plurality of input ports are electrically connected with the input end of the first combiner 400, and the first combiner 400 is coupled with the second combiner.

As can be seen from fig. 2, the present invention integrates the first combiner, the second combiner and the bridge module, and then uses two coaxial lines (coaxial line 1 and coaxial line 2, which are newly labeled in fig. 2) to connect the first combiner and the second combiner, so as to simplify the structure and reduce the volume and weight of the product; however, the two coaxial lines of the multi-system access device occupy a large space, so that the problem of insufficient miniaturization degree still exists.

Disclosure of utility model

In view of the above-mentioned shortcomings of the prior art, the present utility model aims to provide a multi-system access platform, which aims to solve the problem of insufficient miniaturization degree of the existing multi-system access platform.

The technical scheme of the utility model is as follows:

A multi-system access platform, comprising: the circuit comprises a first combiner, a second combiner and a bridge module, wherein the first combiner and the second combiner are respectively provided with a plurality of input ports and an output port, and a separation wall is arranged between the first combiner and the second combiner; the bridge module comprises a bridge cavity, wherein a first bridge piece connected between the output port of the first combiner and the public cavity of the second combiner and a second bridge piece connected between the output port of the second combiner and the public cavity of the first combiner are arranged in the bridge cavity, and the first bridge piece and the second bridge piece are arranged in a staggered mode; the bottom of the bridge cavity is provided with a penetrating hole which is communicated with the outside and the inner cavity of the first combiner or the second combiner, and at least one input port in the first combiner and the second combiner penetrates through the penetrating hole.

The effect of above-mentioned scheme lies in: a separation wall is arranged between the first combiner and the second combiner, physical separation is provided, and mutual interference of signals between different systems is prevented, so that the performance and reliability of the systems are improved; the two bridge sheets arranged in the bridge module are arranged in a staggered manner, so that signals of different systems can be effectively output, and the signals of different systems can be connected in the bridge module in a cross manner, thereby realizing the functions of multi-system access and combination; through the through holes arranged below the bridge cavities, additional space is provided, and the bridge modules and circuit connections can be arranged more effectively, so that the size of the equipment is reduced, and the compactness of the equipment is improved. In general, the multi-system access platform provided by the utility model realizes effective separation, combination and connection of different system signals through the combination of the partition wall, the bridge module and the penetrating holes, improves the performance, the reliability and the integration degree of equipment, and solves the problem of insufficient miniaturization degree of the traditional multi-system access platform.

In a further preferred scheme, the second combiner at least comprises a first signal channel and a second signal channel, the first signal channel is arranged on one side close to the wall of the cavity, a hanging cavity is arranged in the middle of the first signal channel, and the hanging cavity is used for dividing the frequency band of the first signal channel into two sub-frequency bands.

The effect of above-mentioned scheme lies in: through the arrangement of the hanging cavity, the signal frequency band in the original signal channel is effectively divided into two different sub-frequency bands, and greater flexibility is provided; moreover, by dividing the frequency band into two sub-frequency bands, the signal frequency band can be better managed and optimized, so that the signal of each sub-frequency band can be independently processed or distributed to meet different communication requirements; in addition, by separating signals in different frequency bands into different sub-frequency bands, mutual interference among the signals in different frequency bands can be reduced, and the performance and reliability of the system are improved.

In a further preferred embodiment, the frequency band of the second signal channel is smaller than the frequency band of the first signal channel, and the distance between the signal channel with the largest frequency band in the first combiner and the second signal channel is the smallest.

The effect of above-mentioned scheme lies in: the distance between the signal channel with the largest frequency band and the second signal channel is the smallest, and the frequency band of the second signal channel is smaller than that of the first signal channel, so the arrangement mode is matched with the arrangement of the isolation wall, signal isolation between the first combiner and the second combiner is more facilitated, the thickness requirement of the isolation wall can be reduced, and the miniaturization degree of the multi-system access platform is further improved.

In a further preferred scheme, the axes of the openings of the first combiner output port, the second combiner output port, the first combiner public cavity and the second combiner public cavity are in the same horizontal line.

The effect of above-mentioned scheme lies in: the arrangement ensures that the axes of the holes of all key components are on the same horizontal line, on one hand, two holes on the same side can be simultaneously processed and molded, the concentricity of the same side holes is improved, and the signal transmission stability is further improved; on the other hand, the input and output channels of the signals are completely aligned in the horizontal direction, so that stable transmission of the signals is ensured and signal loss is reduced; meanwhile, the mechanical stability of the whole structure is enhanced, good connection among all the components is ensured, and the problem caused by mechanical instability of the equipment is reduced.

In a further preferred scheme, the first combiner is covered with a first cover plate, the second combiner is covered with a second cover plate, and the first cover plate and the second cover plate are both connected to the partition wall.

The effect of above-mentioned scheme lies in: according to the utility model, better physical isolation is realized through the independent arrangement of the first cover plate and the second cover plate, signal interference among different systems is effectively prevented, and the performance and reliability of the systems are improved; moreover, the two cover plates are independently arranged, so that the two combiners can be debugged and maintained respectively, and the two combiners are effectively integrated while the independence of the two combiners is maintained; and the first cover plate and the second cover plate share the partition wall, so that the volume of the multi-system access platform is further reduced, and the processing cost is reduced.

In a further preferred embodiment, the input port and the output port of the first combiner and the input port and the output port of the second combiner are all distributed on the same side.

The effect of above-mentioned scheme lies in: when the input port and the output port are positioned on the same side, a user can more easily install and maintain the equipment, all the connections can be completed on the same side, unnecessary movement or rotation is not needed around the equipment, and time and workload are saved; moreover, the input and output ports on the same side can simplify wiring, reduce messy cables and wiring harnesses, reduce the risk of incorrect connection, and improve the maintainability of the system; in addition, the concentration of the input and output ports on the same side can also more effectively utilize the internal space of the device, making the device more compact.

In a further preferred embodiment, the first combiner at least includes a first input port, a second input port, and a third input port from low to high according to a frequency band, and the third input port is disposed between the first input port and the second input port.

The effect of above-mentioned scheme lies in: the utility model reduces the possibility of interference of signals in different frequency bands by separating the signals in different frequency bands during transmission, especially in a high-density communication environment (for example, if signals in a low frequency band and signals in a high frequency band are mixed together, electromagnetic interference of the signals in the low frequency band and the signals in the high frequency band can interfere with each other, so that the signal quality is reduced); the signals of different frequency bands may need different processing and adjustment to obtain optimal performance, and the utility model can more effectively apply proper signal processing algorithms and parameters by separating the signals of different frequency bands so as to ensure that the signals of each frequency band can be optimally processed; the frequency band division helps to improve system performance, and particularly in complex communication systems that need to process multiple frequency bands, higher transmission speeds, lower bit error rates, and more stable connections can be achieved by reducing interference and optimizing signal processing.

In a further preferable scheme, an L-shaped window and a connecting sheet are arranged at the zero point of the straight cavity of the first combiner, and one end of the connecting sheet is fixed at the junction point of the L-shaped window.

The effect of above-mentioned scheme lies in: the straight cavity is only coupled with the front and back adjacent cavities, the L-shaped window and the connecting sheet are adopted at the zero point to replace ribs, the volume of the multi-system access platform can be further reduced, if the original adopted rib structure adopts the same volume, the small milling cutter with the diameter of 3mm cannot finish processing, the processing difficulty is high, in addition, in order to ensure the signal performance of the cavities, the cavities with smaller volumes sometimes have to be adopted, and if the rib structure is adopted, the processing difficulty is greatly improved.

In a further preferred embodiment, the multi-system access platform is provided with a plurality of signal channels, at least two of the plurality of signal channels sharing the same input port.

The effect of above-mentioned scheme lies in: the utility model realizes signal multiplexing by sharing the same input port through a plurality of signal channels, thereby effectively utilizing input resources, meaning that a plurality of signal sources can transmit data through the same port, and reducing the physical connection of equipment and the number of occupied ports; meanwhile, the utility model also reduces the number of required input ports, thereby saving system resources and cost, reducing the number of ports needing to be wired, and simplifying the wiring and connection of the system.

Compared with the prior art, the multi-system access platform provided by the utility model comprises a first combiner, a second combiner and a bridge module, wherein the first combiner and the second combiner are provided with a plurality of input ports and an output port, and a separation wall is arranged between the first combiner and the second combiner and used for preventing signal interference among different systems; the bridge module comprises a bridge cavity, two bridge sheets are arranged in the bridge cavity in a staggered manner, signals of different systems are effectively combined and connected, the use of coaxial wires is avoided, and the volume of the multi-system access platform is effectively reduced; in addition, the through hole is arranged below the bridge cavity, at least one input port can pass through the through hole, so that the space utilization rate of the multi-system access platform is obviously improved, the arrangement of parts in the device is conveniently and compactly arranged, the size is reduced, the performance, the reliability and the integration degree of the multi-system access platform are improved, and the problem of insufficient miniaturization in the prior art is solved.

Drawings

Fig. 1 is a schematic structural diagram of a multi-system combining platform in the prior art.

Fig. 2 is a schematic structural diagram of another multi-system access device in the prior art.

Fig. 3 is a perspective view of a multi-system access platform in accordance with a preferred embodiment of the present utility model.

Fig. 4 is a top view of a multi-system access platform in accordance with a preferred embodiment of the present utility model.

Fig. 5 is an enlarged view of a portion a in fig. 4.

Fig. 6 is a schematic structural diagram of output ports of a first combiner and a second combiner in a multi-system access platform according to a preferred embodiment of the present utility model.

FIG. 7 is a cross-sectional view of a multi-system access platform according to a preferred embodiment of the present utility model at a penetration hole.

Detailed Description

The utility model provides a multi-system access platform, and in order to make the purposes, schemes and effects of the utility model clearer and more definite, the utility model is further described in detail below by referring to the accompanying drawings and examples.

The present utility model provides a multi-system access platform, as shown in fig. 3, comprising: a first combiner 100, a second combiner 200, and a bridge module 300; the first combiner 100 and the second combiner 200 are separated by a separation wall 400, which is equivalent to two mutually independent combiners, and can realize all functions of independent filters; the partition 400 is used to isolate the first combiner 100 from the second combiner 200. The bridge module 300 includes a bridge cavity in which two key components, a first bridge piece 310 and a second bridge piece 320, are disposed, and the two bridge pieces play a key role in signal connection; wherein the first bridge pad 310 is connected between the output port of the first combiner 100 and the common cavity of the second combiner 200, and the second bridge pad 320 is connected between the output port of the second combiner 200 and the common cavity of the first combiner 100, and the two bridge pads are arranged in a staggered manner to ensure the correct connection and transmission of signals. In addition, a through hole 160 (as shown in fig. 7) is formed at the bottom of the bridge cavity, and one end of the through hole 160 is connected to the outside, and the other end is connected to the inner cavity of the first combiner 100 or the second combiner 200. The connection shaft of at least one input port of the first combiner 100 and the second combiner 200 connects the cavity of the signal path through the penetration hole 160 so that the system can make better use of the space under the bridge cavity for efficient signal transmission and connection.

In the above scheme, the present utility model effectively integrates the first combiner 100, the second combiner 200 and the bridge module 300, and cancels the use of coaxial lines in the prior art, thereby saving space and improving the integration degree of the multi-system access platform, and in this process, the arrangement mode of the bridge sheet in the bridge module 300 plays a key role: the two bridge sheets arranged in the bridge module 300 are arranged in a staggered manner, so that signals of different systems can be effectively output, and the signals of different systems can be cross-connected in the bridge module 300, thereby realizing the multi-system access and combination functions. The arrangement of the through holes 160 further improves the miniaturization of the multi-system access platform, and provides additional space for more effectively arranging the bridge module 300 and the circuit connection through the through holes 160 arranged below the bridge cavity, thereby reducing the volume of the device and improving the compactness of the device. Therefore, in general, the multi-system access platform provided by the utility model realizes effective separation, combination and connection of different system signals through the combination of the partition wall 400, the bridge module 300 and the penetrating holes 160, improves the performance, the reliability and the integration degree of equipment, and solves the problem of insufficient miniaturization degree of the existing multi-system access platform.

In the embodiment of the present utility model, a description will be given of an implementation of the present utility model by taking a platform with a specification shown in the following table as an example:

As can be seen from the above table, the operating frequency bands of the multi-system access platform are totally 9, namely 1710-1735, 1805-1830, 1885-1915, 2010-2025, 2515-2675, 1735-1785, 1830-1880, 1920-1980 and 2110-2170 respectively.

In a specific implementation, the present utility model integrates the working frequency bands with the numbers 1-3 into the first combiner 100, and the working frequency bands with the numbers 4 and 5 into the second combiner 200, where the first combiner 100 is provided with three signal channels, namely, a third signal channel (the signal channel is more complex, and represented by its input connector, and labeled 110 in fig. 4), a fourth signal channel (the signal channel is more complex, and represented by its input connector, and labeled 120 in fig. 4), and a fifth signal channel (the signal channel is more complex, and represented by its input connector, and labeled 130 in fig. 4), which correspond to the working frequency bands 1-3, respectively.

The second combiner 200 is provided with two signal channels, namely a first signal channel (the signal channel is more complex and denoted by its input connector, and is denoted by reference numeral 210 in fig. 4) and a second signal channel (the signal channel is more complex and denoted by its input connector, and is denoted by reference numeral 220 in fig. 4), corresponding to the operating frequency bands 4 to 5, respectively.

In a further preferred embodiment of the present utility model, the first signal channel is disposed on a side close to the cavity wall, and a hanging cavity 221 is disposed in the middle of the first signal channel, as shown in fig. 4, where the hanging cavity 221 is used to divide the frequency band of the first signal channel into two sub-frequency bands. That is, the hanging cavity 221 divides the operating frequency band 1920-2170 into two sub-bands 1920-1980 and 2110-2170. The utility model effectively separates the signal frequency band in the original signal channel into two different sub-frequency bands by arranging the hanging cavity 221, thereby providing greater flexibility; moreover, by dividing the working frequency band 1 into two sub-frequency bands, the signal frequency band can be better managed and optimized, so that the signal of each sub-frequency band can be independently processed or distributed to meet different communication requirements; in addition, by separating signals in different frequency bands into different sub-frequency bands, mutual interference among the signals in different frequency bands can be reduced, and the performance and reliability of the system are improved.

Further, the third signal channel, the fourth signal channel and the fifth signal channel have the highest working frequency band (2515-2675), preferably the fifth signal channel is arranged near the isolation wall 400, the second signal channel has the lowest working frequency band (1735-1785/1830-1880) in the second combiner 200, as can be seen from the above table, one of the working frequency bands of the second signal channel and the fifth signal channel is the highest in one combiner, the other is the lowest in the other combiner, and the difference between the two is the largest, so that effective signal isolation can be performed. Because the distance between the signal channel with the largest frequency band and the second signal channel is the smallest, and the frequency band of the second signal channel is smaller than that of the first signal channel, the arrangement mode is matched with the arrangement of the isolation wall 400, so that the signal isolation between the first combiner 100 and the second combiner 200 is more beneficial, the thickness requirement of the isolation wall can be reduced, and the miniaturization degree of the multi-system access platform is further improved.

And the third signal path is disposed between the fourth signal path and the fifth signal path. Also, signals of different frequency bands may interfere with each other during transmission, particularly in a high-density communication environment, by separating the signals of different frequency bands, the utility model reduces the possibility of interference of the signals of different frequency bands (for example, if signals of low frequency band and signals of high frequency band are mixed together, electromagnetic interference of the signals of low frequency band and the signals of high frequency band may interfere with each other, resulting in reduced signal quality); the signals of different frequency bands may need different processing and adjustment to obtain optimal performance, and the utility model can more effectively apply proper signal processing algorithms and parameters by separating the signals of different frequency bands so as to ensure that the signals of each frequency band can be optimally processed; frequency band division helps to improve system performance, and particularly in complex communication systems that need to handle multiple frequency bands, higher transmission speeds and more stable connections can be achieved by reducing interference and optimizing signal processing.

Specifically, an L-shaped window 121 and a connecting piece 122 are disposed at the zero point of the in-line cavity of the first combiner 100, and as shown in fig. 5, one end of the connecting piece 122 is fixed at the junction of the L-shaped window 121. For example, the zero point of the straight cavity of the fourth signal channel adopts the L-shaped window 121 and the connecting piece 122 to replace the original rib structure, because the straight cavity is only coupled with the front and rear adjacent cavities, the volume of the multi-system access platform can be further reduced by adopting the L-shaped window 121 and the connecting piece 122 to replace ribs at the zero point, if the original rib structure adopts the same volume, the processing cannot be completed even by the small milling cutter with the diameter of 3mm, so that the processing difficulty is high, and in order to ensure the signal performance of the cavities, the cavities with smaller volumes sometimes have to be adopted, and if the rib structure is adopted, the processing difficulty is greatly improved.

Preferably, the output port of the first combiner 100 (denoted by reference numeral 150 in fig. 6), the output port of the second combiner 200 (denoted by reference numeral 250 in fig. 6), and the axes of the openings of the common cavity of the first combiner 100 and the common cavity of the second combiner 200 are in the same horizontal line. The arrangement ensures that the axes of the holes of all key components are on the same horizontal line, on one hand, two holes on the same side can be simultaneously processed and molded, the concentricity of the same side holes is improved, and the signal transmission stability is further improved; on the other hand, the input and output channels of the signals are completely aligned in the horizontal direction, so that stable transmission of the signals is ensured and signal loss is reduced; meanwhile, the mechanical stability of the whole structure is enhanced, good connection among all the components is ensured, and the problem caused by mechanical instability of the equipment is reduced.

According to another aspect of the present utility model, the first combiner 100 is covered with a first cover, the second combiner 200 is covered with a second cover, and both the first cover and the second cover are connected to the partition wall 400. According to the utility model, better physical isolation is realized through the independent arrangement of the first cover plate and the second cover plate, signal interference among different systems is effectively prevented, and the performance and reliability of the systems are improved; moreover, the two cover plates are independently arranged, so that the two combiners can be debugged and maintained respectively, and the two combiners are effectively integrated while the independence of the two combiners is maintained; and the first cover plate and the second cover plate share the partition wall 400, so that the volume of the multi-system access platform is further reduced, and the processing cost is reduced.

Preferably, the input port and the output port of the first combiner 100 are all distributed on the same side as the input port and the output port of the second combiner 200. When the input port and the output port are positioned on the same side, a user can more easily install and maintain the equipment, all the connections can be completed on the same side, unnecessary movement or rotation is not needed around the equipment, and time and workload are saved; moreover, the input and output ports on the same side can simplify wiring, reduce messy cables and wiring harnesses, reduce the risk of incorrect connection, and improve the maintainability of the system; in addition, the concentration of the input and output ports on the same side can also more effectively utilize the internal space of the device, making the device more compact.

Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the utility model and form different embodiments; for example, any of the claimed embodiments can be used in any combination.

It should be noted that the above-mentioned embodiments illustrate rather than limit the utility model, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The utility model may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specifically stated.

Claims (9)

1. A multi-system access platform, comprising: the circuit comprises a first combiner, a second combiner and a bridge module, wherein the first combiner and the second combiner are respectively provided with a plurality of input ports and an output port; the bridge module comprises a bridge cavity, wherein a first bridge piece connected between the output port of the first combiner and the public cavity of the second combiner and a second bridge piece connected between the output port of the second combiner and the public cavity of the first combiner are arranged in the bridge cavity, and the first bridge piece and the second bridge piece are arranged in a staggered mode; the bottom of the bridge cavity is provided with a penetrating hole which is communicated with the outside and the inner cavity of the first combiner or the second combiner, and at least one input port in the first combiner and the second combiner penetrates through the penetrating hole.

2. The multi-system access platform of claim 1, wherein the second combiner comprises at least a first signal channel and a second signal channel, the first signal channel is disposed on one side close to the cavity wall, a hanging cavity is disposed in the middle of the first signal channel, and the hanging cavity is used for dividing a frequency band of the first signal channel into two sub-frequency bands.

3. The multi-system access platform of claim 2, wherein the frequency band of the second signal path is smaller than the frequency band of the first signal path, and the signal path with the largest frequency band in the first combiner has the smallest distance from the second signal path.

4. A multi-system access platform according to any of claims 1-3, wherein the axes of the openings of the first combiner output port, the second combiner output port, the first combiner common cavity and the second combiner common cavity are in the same horizontal line.

5. A multi-system access platform according to any of claims 1-3, wherein the first combiner is covered with a first cover plate, the second combiner is covered with a second cover plate, and both the first cover plate and the second cover plate are connected to the partition wall.

6. A multi-system access platform according to any of claims 1-3, wherein the input ports and output ports of the first combiner are all distributed on the same side as the input ports and output ports of the second combiner.

7. A multi-system access platform according to any of claims 1-3, wherein the first combiner comprises at least a first input port, a second input port and a third input port from low to high according to frequency bands, the third input port being arranged between the first input port and the second input port.

8. The multi-system access platform of claim 7, wherein an L-shaped window and a connecting piece are provided at the zero point of the in-line cavity of the first combiner, and one end of the connecting piece is fixed at the junction of the L-shaped window.

9. A multi-system access platform according to any of claims 1-3, wherein the multi-system access platform is provided with a plurality of signal channels, at least two of the plurality of signal channels sharing the same input port.