Rack-mounted media network management platform
By integrating the main control board and network switching board into a 2U server, and incorporating an ARM64 main controller and a 10 Gigabit network switching module, the problems of low integration and inconvenient management are solved, achieving efficient board management and convenient disassembly and assembly, thus improving the integration and reliability of the equipment.
Patent Information
- Application Number
- CN202423312110.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing 2U servers have low integration, lack centralized management capabilities, rely on external network switches, have cumbersome card replacement, cannot be managed and maintained in a unified manner, and their internal design is not suitable for use in small spaces.
The rack-mounted media network management platform integrates a main control card and a network switching card. It has a built-in ARM64 main controller and a 10 Gigabit network switching module, is equipped with centralized management software, a U-shaped PCB board and dual redundant power supply modules, and has built-in cooling fans and a display screen, enabling centralized management and convenient installation and removal of the cards.
It improves the integration of the card board, realizes centralized management and control of the card board, simplifies network connection, reduces cable usage, supports hot-swapping and display screen to view status, and improves the reliability and ease of operation of the equipment.
Smart Images

Figure CN223798507U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of audio and video transmission technology, specifically to a rack-mounted media network management platform. Background Technology
[0002] As the requirements for audio and video transmission become increasingly stringent, rack-mounted media network management platforms need to integrate more and more functional modules. Therefore, existing rack-mounted media network management platforms require the installation of an increasing number of service cards. Currently, rack-mounted media network management platforms, typically represented by 2U servers, can support 10 codec modules, which can be freely combined, and the corresponding service cards are hot-swappable. These servers possess a certain degree of centralized management capability. However, existing 2U servers still have the following shortcomings:
[0003] 1. Since the existing 2U servers can only support a maximum of 10 service cards, the product integration is not high enough, making it difficult to meet the growing functional requirements of audio and video transmission.
[0004] 2. The existing 2U server does not have a centralized management software platform configured inside, or rather, it only has simple centralized management capabilities. It can only bring all the cards together and provide a unified power supply, but it cannot perform unified management, maintenance, one-click firmware upgrades, and other tasks for all the service cards.
[0005] 3. The existing 2U server heavily relies on external third-party network switches to solve the network communication problem of the service cards. Therefore, an additional network switch needs to be configured. Moreover, a large number of network cables need to be connected between the 2U server and the network switch. For example, if 10 service cards are set up in the 2U server, 10 network cables need to be connected between the 2U server and the network switch. The large number of network cables is not only difficult to manage, but also easy to cause accidental contact and pulling problems.
[0006] 4. In existing 2U servers, the service card plug-in structure is designed on the back of the product. This design presents difficulties in installing and replacing service cards. When a 2U server is deployed in a small server room or a small broadcast van, users may find it impossible to remove the service cards from the back of the 2U server due to insufficient space. They would have to disconnect all signal cables, power cables, network cables, fiber optic cables, etc., and remove the 2U server from the server rack to complete the card replacement, making the operation extremely cumbersome and inefficient.
[0007] 5. The existing 2U servers do not have a display screen. If you want to check the server's operating status and configuration, you have to connect each business card to a computer individually, log in, and view and modify the configuration in the backend, which is very troublesome. Utility Model Content
[0008] The technical problem to be solved by this utility model is to address the issues of low integration number of service cards and lack of centralized management capabilities in existing rack-mounted media network management platforms, as well as their reliance on external network switching. The present invention provides a rack-mounted media network management platform that is compact, easy to assemble and disassemble, and has centralized network management and network switching functions.
[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0010] A rack-mounted media network management platform includes a chassis housing, and a front panel and a PCB board disposed opposite each other at both ends of the chassis housing. The front of the PCB board has a main control female connector and multiple service female connectors to integrate the main control card and multiple service cards within the chassis housing. The main control card is used to manage the operation of the service cards. A network switching card is also provided inside the chassis housing. The service female connectors are connected to the network switching card via cables to enable network data exchange between the service cards and the network switching card. Both the main control card and the network switching card are provided with high-speed connectors, and the main control card and the network switching card are connected via high-speed connectors.
[0011] As a further improvement of this utility model, the main control card has a built-in ARM64 main controller and runs centralized management platform software.
[0012] As a further improvement of this utility model, the network switching card has a built-in 10 Gigabit network Layer 3 managed switching module; the network switching card is provided with a network port and a fiber optic port.
[0013] As a further improvement of this utility model, the chassis housing is also provided with a dual-redundant hot-backup power supply module. The power supply module is connected to the PCB board through a power jumper to realize centralized power supply to the service card board and the main control card board.
[0014] As a further improvement of this utility model, the PCB board has a U-shaped structure, and a copper strip and a power input port are provided on the lower back of the PCB board. The copper strip is arranged along the length of the PCB board, and both the service female connector and the main control female connector are connected to the copper strip. The power input port is located on one side of the copper strip and is connected to the power module through a power jumper.
[0015] As a further improvement of this utility model, a power input port is arranged on the lower left side of the PCB board, and the power lines gradually decrease from left to right to supply power to the main control board and multiple service boards respectively.
[0016] As a further improvement of this utility model, network signal lines are arranged on the lower right side of the PCB board. The network signal lines gradually increase from left to right and converge to the main control socket, which is connected to the main control card.
[0017] As a further improvement of this utility model, a connecting rod assembly is slidably provided on the inner side wall of the chassis housing. The connecting rod assembly is connected to the front panel to realize the detachable connection between the front panel and the chassis housing, so as to facilitate the installation and removal of the business card.
[0018] As a further improvement of this utility model, the bottom plate of the chassis housing is provided with multiple parallel guide grooves, which are used to assist in the installation of the business card board and the main control card board.
[0019] As a further improvement of this utility model, a cooling fan is also provided inside the chassis housing. The cooling fan is respectively located on the inner side of the front panel and the rear of the power module to dissipate heat from the service card board and the power module.
[0020] As a further improvement of this utility model, the front panel is provided with multiple ventilation holes.
[0021] As a further improvement of this utility model, a display screen is provided on the front panel, and multiple buttons are provided below the display screen.
[0022] Compared with the prior art, the advantages of this utility model are:
[0023] 1. This utility model's rack-mounted media network management platform integrates the main control board and multiple service boards within a chassis by setting a main control motherboard and multiple service motherboards on the PCB board. By configuring different service boards, various product forms can be arbitrarily combined, such as high-density multi-channel encoders, multi-channel decoders, multi-channel encoder / decoder all-in-one machines, multi-channel media gateways, and multi-channel aggregation decoder gateways. Furthermore, the main control board can centrally manage and control all service boards, enabling functions such as automatic discovery, automatic monitoring, centralized status monitoring, fault diagnosis, parameter configuration, and online firmware upgrade distribution. Simultaneously, a network switching card is also installed within the chassis. The service card board connects to the network switching card board via cables, enabling network data exchange between them. The main control card board connects to the network switching card board via high-speed connectors, achieving the same network data exchange. This eliminates the need for additional network switches and complex network cabling, avoiding unforeseen problems caused by loose or damaged external cable connectors. Furthermore, shorter internal traces on the PCB board result in better network signal transmission quality. Additionally, a connecting rod assembly slides along the inner wall of the chassis, connecting to the front panel for detachable connection and easy installation / removal of the service card board.
[0024] 2. The rack-mounted media network management platform of this utility model, by setting a display screen on the front panel, meets the user's need to intuitively view the working status of the rack-mounted media network management platform at any time and adjust the configuration at will.
[0025] 3. The rack-mounted media network management platform of this utility model provides a strong power supply to the rack-mounted media network management platform by setting up dual 550W redundant power supply modules, and supports hot-swapping to prevent easy power failure; at the same time, cooling fans are also set on the inner side of the front panel and the rear of the power module, which can provide excellent heat dissipation for the service cards and power modules, ensuring the stable and reliable operation of the equipment. Attached Figure Description
[0026] Figure 1 This is a schematic diagram illustrating the structural principle of the rack-mounted media network management platform in a specific embodiment of this utility model;
[0027] Figure 2 This is a schematic diagram illustrating the structural principle of the rack-mounted media network management platform with its front panel open in a specific embodiment of this utility model.
[0028] Figure 3 This is a schematic diagram of the heat dissipation principle of the rack-mounted media network management platform in a specific embodiment of this utility model; the arrows in the diagram indicate the direction of cooling airflow.
[0029] Figure 4 This is a top view schematic diagram illustrating the structural principle of the rack-mounted media network management platform with the top plate removed in a specific embodiment of this utility model;
[0030] Figure 5 This is a partial structural principle diagram of the rack-mounted media network management platform in a specific embodiment of this utility model;
[0031] Figure 6 This is a schematic diagram of the front structure of the PCB board in a specific embodiment of the present invention;
[0032] Figure 7 This is a schematic diagram of the back structure of the PCB board in a specific embodiment of the present invention;
[0033] Figure 8 This is a schematic diagram of the power supply traces inside the PCB board in a specific embodiment of this utility model. The shaded area in the figure represents the power supply traces.
[0034] Figure 9 This is a schematic diagram of the internal network routing of the PCB board in a specific embodiment of this utility model. The shaded area in the figure represents the network routing.
[0035] Figure 10 This is a schematic diagram of the structural principle of the service cardboard in a specific embodiment of this utility model;
[0036] Figure 11 This is a schematic diagram of the structural principle of the main control card in a specific embodiment of this utility model;
[0037] Figure 12 This is a schematic diagram of the structural principle of the network switching card in a specific embodiment of this utility model;
[0038] Legend: 1. Chassis; 2. Front panel; 3. Display screen; 4. Handle; 5. Button; 6. Ventilation vent; 7. Knob; 8. Linkage assembly; 9. Service card; 91. Service interface; 92. Service gold finger; 10. Main control card; 101. USB interface; 102. Main control gold finger; 11. Network switching card; 111. Switch gold finger; 112. Network port; 113. Fiber optic port; 12. Cooling fan; 13. Power module; 14. Network port; 15. Fiber optic port; 16. Service female connector; 17. Base plate; 18. Guide groove; 19. Power jumper; 20. PCB board; 201. Copper strip; 202. Power input port; 21. Main control female connector; 22. High-speed connector. Detailed Implementation
[0039] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.
[0040] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.
[0042] Example
[0043] like Figure 1 , Figure 2 and Figure 6As shown, the rack-mounted media network management platform of this utility model includes a chassis housing 1, and a front panel 2 and a PCB board 20 disposed opposite each other at both ends of the chassis housing 1. The front of the PCB board 20 has a main control female connector 21 and multiple service female connectors 16, so as to integrate the main control card board 10 and multiple service cards 9 within the chassis housing 1. The main control card board 10 is used to manage the operation of the service cards 9. A network switching card board 11 is also provided inside the chassis housing 1. The service female connectors 16 are connected to the network switching card board 11 via cables to enable network data exchange between the service cards 9 and the network switching card board 11. Figure 11 and Figure 12 As shown, high-speed connectors 22 are provided on both sides of the main control board 10 and both sides of the network switching board 11. The main control board 10 and the network switching board 11 are connected through the high-speed connectors 22 to enable network data exchange between them. A connecting rod assembly 8 is slidably installed on the inner wall of the chassis housing 1. The connecting rod assembly 8 is connected to the front panel 2. Knobs 7 are provided between the two sides of the front panel 2 and the chassis housing 1. When the knobs 7 are loosened, the front panel 2 is pulled, and with the assistance of the connecting rod assembly 8, the front panel 2 and the chassis housing 1 can be detachably connected, facilitating the installation and removal of the service board 9 from the front of the chassis housing 1. When the equipment is installed in a confined space, even if there is no space at the rear of the chassis housing 1 to insert or remove the board, the signal line of the service board 9 interface can be disconnected to insert or remove it from the front of the chassis housing 1 without disassembling the entire equipment, thus providing greater flexibility.
[0044] In this embodiment, the gold fingers of both the service card board 9 and the main control card board 10 are connected to the PCB board 20. In this way, all cards are powered through the gold fingers, which also forms a network interconnection between the service card board 9 and the main control card board 10 / network switching card board 11. The main control card board 10 can manage all the service cards 9, and all the service cards 9 can exchange network data with the network switching card board 11.
[0045] like Figure 4 As shown in this embodiment, the rack-mounted media network management platform includes one main control card 10 and one network switching card 11, and allows the insertion of up to 18 service cards 9 for different services, such as audio / video encoding, decoding, integrated encoding / decoding, NDI, and media gateways, significantly improving integration. By configuring service cards 9 with different functional modules, this rack-mounted media network management platform can be arbitrarily combined into various forms of products, such as high-density multi-channel encoders, multi-channel decoders, multi-channel integrated encoders / decoders, multi-channel media gateways, and multi-channel aggregation decoding gateways. The service forms can be arbitrarily combined and flexibly expanded.
[0046] like Figure 10As shown, in this embodiment, the service card board 9 is equipped with three service interfaces 91 and one service gold finger 92. The service gold finger 92 is connected to the service motherboard 16 to provide power and network connection with the main control card board 10 and the switching card board 11. The service card board 9 can be an RFN-60 4Kp60 HDMI encoding / decoding / NDI integrated service card: an integrated service card with encoding and decoding capabilities, supporting H.264 / H.265 / NDI SpeedHQ CODEC, and supporting 4Kp60 ultra-high-definition YCbCr 4∶2∶2 / 10bit color format. The service card board 9 can also be an RFN-6 high-definition HDMI encoding / decoding / NDI integrated service card: a comprehensive service card with high-definition encoding and decoding capabilities, supporting H.264 / H.265 / NDI SpeedHQ. Service card 9 can also adopt the RFN-50 4Kp60 12G-SDI encoding / decoding / NDI integrated service card: a comprehensive service card with integrated encoding and decoding capabilities, supporting H.264 / H.265 / NDI SpeedHQ CODEC, and supporting 4Kp60 ultra-high-definition YCbCr 4∶2∶2 / 10bit color format. Service card 9 can also adopt the RFN-5 high-definition HDMI encoding / decoding / NDI integrated service card: a comprehensive service card with integrated high-definition encoding and decoding, supporting H.264 / H.265 / NDI SpeedHQ.
[0047] like Figure 11 As shown, the main control board 10 has main control gold fingers 102 at both ends. One end of the main control gold finger 102 is connected to the main control female connector 21 to provide power and connect to all service boards 9. The other end of the main control gold finger 102 and the USB interface 101 at the end of the main control board 10 can connect to external devices. In this embodiment, the main control board 10 has a built-in high-performance ARM64 main controller and runs the KiloLink Server centralized management platform software, which can centrally manage and control all service boards 9, and realize functions such as automatic discovery, automatic supervision, centralized status monitoring, fault diagnosis, parameter configuration, and online firmware upgrade distribution. At the same time, the main control board 10 also supports more advanced service functions of KiloLink Server, such as media aggregation service for Kiloview's 4G / 5G wireless aggregation products, supporting KiloLink aggregation services, allowing Kiloview wireless aggregation products to directly aggregate and connect via 4G / 5G; by extending the decoding service board 9, 4G / 5G aggregation can be directly output as baseband video.
[0048] In this embodiment, the working principle of the KiloLink Server centralized management platform software includes: web access management based on HTTP / HTTPS; real-time display of device working status information (network / CPU / memory / temperature / performance); real-time display of basic information and working status of each card module; management and configuration of the device, such as modifying the device name / network IP address, setting encoding / decoding / conversion parameters, creating streaming media services, upgrading firmware, etc.; support for Microsoft Edge / Firefox / Chrome / Safari / Opera web browsers; providing HTTP / HTTPS APIs for users to remotely (programmable) call / control; and allowing software upgrades by uploading firmware through the web management interface.
[0049] In this embodiment, the network switching card 11 has a built-in 240Gbps 10 Gigabit network Layer 3 managed switching module. All service cards 9 in the device are connected to the 1G / 2.5G network switch module on the network switching card 11 via card gold finger sockets. Figure 12 As shown, the network switching card 11 has a switching gold finger 111, a 10G network port 112 and three 10G fiber optic ports 113. The rack-mounted media network management platform ultimately provides three 10Gbps SFP+ fiber optic Ethernet interfaces and one 10Gbps RJ45 Ethernet interface to connect to the external network.
[0050] The rack-mounted media network management platform has a built-in network switch, eliminating the need to purchase an additional network switch or provide power outlets and cables, thus saving costs. The absence of cumbersome network cables also saves installation space; 18 service cards would require 18 network cables to connect to an external switch, taking up significant installation space. Shorter PCB traces within the management platform result in better network signal transmission quality and avoid unforeseen problems caused by loose or damaged external cables, improving network transmission stability.
[0051] like Figure 5 As shown, in this embodiment, the chassis housing 1 is also provided with a dual redundant hot backup power module 13. The power module 13 is connected to the PCB board 20 through the power jumper 19 to realize centralized power supply to the service card board 9 and the main control card board 10.
[0052] like Figure 7As shown, two copper strips 201 are soldered along the length of the PCB board 20 to the lower back of the PCB board 20, one for positive and one for negative current. Both the service connector 16 and the main control connector 21 are connected to the copper strips 201. The copper strips 201 can handle high current and provide support for the PCB board 20 to prevent deformation due to its large size. The power input port 202 is located on one side of the copper strips 201, on the lower right side of the PCB board 20. The power input port 202 is connected to the power module 13 via a power jumper 19.
[0053] In this embodiment, the power module 13 is a dual redundant hot backup power supply with 2×550W. The current is led to the PCB board 20 through two pairs of high current jumpers. It can provide a stable power supply of up to 28W or more to each service board 9. It also supports hot-swapping. Even if one of the power modules 13 suddenly stops working, the power will not be cut off, and the user can replace it with ease.
[0054] In a rack-mounted media network management platform, a large number of service cards 9 are often integrated. In this embodiment, there are as many as 18 service cards 9. The platform also includes one main control card 10 and one network switching card 11. The main control card 10 centrally manages these service cards 9, resulting in a total of 20 cards in the entire system. Each service card 9 needs to communicate bidirectionally with the main control card 10 to transmit data. The power module 13 also supplies power to each service card 9 through the PCB board 20. Each service card 9 also needs external interfaces (at least 3 interfaces). To expose these interfaces, the PCB board 20 is designed with a U-shape, leaving extremely narrow areas for communication and power supply traces.
[0055] In this embodiment, the PCB board 20 can both power all the control cards and serve as the network connecting the entire system. The power module 13 is connected to the left side of the U-shaped PCB board 20, and the main control card 10 is located on the right side. For example... Figure 8 As shown, the power supply traces begin at the V+ / V- point on the left and gradually decrease from left to right, supplying power to 18 service boards 9 and 1 main control board 10 respectively; Figure 9 As shown, the network signal lines of the 18 service boards 9 and the main control board 10 gradually increase from left to right and converge at the rightmost main control connector 21, connecting to the main control board 10. This distributed layout, with power supply on the left and main control board 10 on the right, achieves staggered power and network traces, maximizing the utilization of the U-shaped PCB board 20's trace area, reducing the number of PCB layout layers, thereby lowering manufacturing costs and also contributing to a smaller overall size of the rack-mounted media network management platform.
[0056] like Figure 5As shown, the bottom plate 17 of the chassis housing 1 is provided with multiple parallel guide grooves 18. The guide grooves 18 are used to assist in the installation of the service card board 9 and the main control card board 10, so as to improve the convenience of board assembly and disassembly.
[0057] Due to the high-density integration of the business card board 9, the heat generated during operation is also significant, such as Figure 3 As shown, the chassis housing 1 also houses a cooling fan 12, which is located on the inner side of the front panel 2 and at the rear of the power module 13, for cooling the service card 9 and the power module 13. Correspondingly, the front panel 2 has multiple ventilation holes 6. The large ventilation holes 6 provide a significant airflow for cooling the entire system. Relying on the unobstructed airflow in the middle card section and the ventilation holes on the rear / top of the chassis housing 1, the entire system achieves a powerful cooling effect.
[0058] like Figure 1 As shown, the front panel 2 is equipped with a display screen 3, and below the display screen 3 are multiple buttons 5, which facilitate users to quickly monitor the status and adjust the configuration, and also allow for some basic configuration.
[0059] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A rack-mounted media network management platform, characterized in that, The system includes a chassis housing (1), and a front panel (2) and a PCB board (20) disposed opposite to each other at both ends of the chassis housing (1). The PCB board (20) has a main control female connector (21) and multiple service female connectors (16) on its front side to integrate the main control card board (10) and multiple service cards (9) into the chassis housing (1). The main control card board (10) is used to manage the operation of the service cards (9). The chassis housing (1) also has a network switching card board (11). The service female connectors (16) are connected to the network switching card board (11) via cables to enable network data exchange between the service cards (9) and the network switching card board (11). Both the main control card board (10) and the network switching card board (11) are provided with high-speed connectors (22). The main control card board (10) and the network switching card board (11) are connected via high-speed connectors (22) to enable network data exchange between the main control card board (10) and the network switching card board (11).
2. The rack-mounted media network management platform according to claim 1, characterized in that, The main control board (10) has a built-in ARM64 main controller and runs centralized management platform software.
3. The rack-mounted media network management platform according to claim 1, characterized in that, The network switching card (11) has a built-in 10 Gigabit network Layer 3 managed switching module; the network switching card (11) is provided with a network port (112) and an optical fiber port (113).
4. The rack-mounted media network management platform according to claim 1, characterized in that, The chassis housing (1) is also equipped with a dual redundant hot backup power module (13). The power module (13) is connected to the PCB board (20) through a power jumper (19) to centrally power the service card board (9) and the main control card board (10).
5. The rack-mounted media network management platform according to claim 1, characterized in that, The PCB board (20) has a U-shaped structure. A copper strip (201) and a power input port (202) are provided on the lower back of the PCB board (20). The copper strip (201) is arranged along the length of the PCB board (20), and the business female connector (16) and the main control female connector (21) are both connected to the copper strip (201). The power input port (202) is located on one side of the copper strip (201), and the power input port (202) is connected to the power module (13) through a power jumper (19).
6. The rack-mounted media network management platform according to claim 5, characterized in that, The power input port (202) is arranged on the lower left side of the PCB board (20), and the power lines gradually decrease from left to right to supply power to the main control board (10) and multiple service boards (9) respectively.
7. The rack-mounted media network management platform according to claim 5, characterized in that, Network signal lines are arranged on the lower right side of the PCB board (20). The network signal lines gradually increase from left to right and converge to the main control socket (21) and connect to the main control card board (10).
8. The rack-mounted media network management platform according to any one of claims 1 to 7, characterized in that, A connecting rod assembly (8) is slidably provided on the inner side wall of the chassis housing (1). The connecting rod assembly (8) is connected to the front panel (2) to realize the detachable connection between the front panel (2) and the chassis housing (1) so as to facilitate the disassembly and assembly of the business card plate (9).
9. The rack-mounted media network management platform according to any one of claims 4 to 6, characterized in that, The chassis housing (1) is also equipped with a cooling fan (12), which is respectively located on the inside of the front panel (2) and the rear of the power module (13) to dissipate heat from the service card (9) and the power module (13).
10. The rack-mounted media network management platform according to any one of claims 1 to 7, characterized in that, The front panel (2) is provided with a display screen (3), and a plurality of buttons (5) are provided below the display screen (3).