JP3066848B2 - High-speed digital electronic devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed digital electronic device for exchanging data between circuit boards in the device at a high speed.

[0002]

2. Description of the Related Art In a conventional digital electronic device, data transfer between circuit boards in the device is mainly performed using a bus, which is useful for realizing an economical and compact device.

FIG. 8 is a diagram for explaining a physical connection (a) and an electrical connection (b) in a conventional bus-type connection. FIG.
, The plurality of circuit boards 81 _{1 to} 81 _n are mutually connected via a bus wiring 82. The bus wiring 82
Is implemented with a back wiring board or cable. Now, when data is transmitted from the circuit board 81 ₂ to a circuit board 81 _n is to send data from the driver 83 of the circuit board 81 ₂ to the receiver 84 on the circuit board 81 _n as shown in FIG. 8 (b) But driver 8
3 must drive all the receivers 85 connected to the signal wiring (one of the bus wirings 82) and all the wiring paths leading to them. Therefore, high performance is required as a driver, but high-speed data transmission is still extremely difficult due to waveform distortion and the like.

[0004]

By the way, with the speeding up of computers and digital communications, it is necessary to handle high-speed data of several hundred Mbps or more. However, in a configuration using a conventional bus structure, data transmission is difficult. Increase in the number of parallel transmissions (bit width) and the accompanying increase in the number of bus lines, number of transmission / reception circuits, number of connector pins, number of circuit boards, number of back wiring board layers, etc. Is gone. Furthermore, the number G
At speeds of bps and above, communication with the bus structure has become almost impossible except for very small devices. As described above, in the conventional configuration, there is no method for economically transmitting and receiving high-speed data in the device in a wide range of applications from small-scale devices to large-scale devices.

The present invention enables a high-speed transmission / reception of data in a digital electronic device which handles high-speed communication data, such as an asynchronous transfer mode (ATM) ATM switch or an ATM multiplexer in the switching field. It is an object of the present invention to provide a high-speed digital electronic device capable of economically configuring a device from a large-scale device to a large-scale device.

[0006]

According to a first aspect of the present invention, there are provided a plurality of circuit boards, and a group of bus wirings connecting the respective circuit boards to each other in a bus form via a back wiring board or a cable. A high-speed digital electronic device, comprising an electronic switch board for connecting the circuit boards to each other in a star shape via a connection cable,
High-speed data transmission / reception between the respective circuit boards via the electronic switch board and the connection cable thereof, and non-high-speed data transmission / reception between the respective circuit boards via the bus wiring group It is characterized by.

According to a second aspect of the present invention, there is provided a circuit board, an electronic switch board, a bus wiring group, a cooling unit and a power supply unit thereof, and a supporting structure for supporting each unit. Are arranged as a module arranged in one housing.

According to a third aspect of the present invention, in the high-speed digital electronic device according to the second aspect, the electronic switch boards of a plurality of modules are connected by a cable group, and the whole is connected to one.
It is characterized by being constituted as one device.

[0009]

In the high-speed digital electronic device according to the first aspect of the present invention, data transmission / reception in the device that requires a really high speed is performed by communication in a star-shaped connection between circuit boards centering on an electronic switch board. By using a path,
It can meet the demand for high speed. In addition, the transmission and reception of data in general devices that do not require high-speed performance use the communication path of the conventional bus-type connection, which increases the amount of hardware used for star-type connection centering on electronic switch boards. Can be compressed, and miniaturization and economy can be realized as a whole.

According to the second aspect of the present invention, each circuit board, the electronic switch board, and the bus wiring group including the cooling means and the power supply means are supported by the support structure, thereby realizing modularization in a single housing. Thereby, compactness can be achieved.

According to the third aspect of the present invention, by interconnecting the electronic switch boards of a plurality of modules,
From small-scale devices to large-scale devices can be constructed economically and flexibly.

[0012]

FIG. 1 is a block diagram showing an example of the basic configuration of a high-speed digital electronic device according to the present invention.

[0013] In Figure, the circuit board 11 ₁ to 11 _n are connected to each other via a bus line 12, to transmit and receive general data by the bus-type connection. In the present invention, an electronic switch board 13 for connecting each circuit board in a star configuration is provided, and each of the circuit boards is connected via a high-speed cable 14 with a connector, and high-speed data transmission / reception is performed by this star connection. The electronic switch system on the electronic switch board and the control system thereof are selected from known technologies according to the intended function of the device. Each unit is formed into a module including a cooling unit and a power supply unit (not shown), and is realized by interconnecting the electronic switch boards 13 with other modules.

FIG. 2 shows a physical connection when each circuit board is connected in a star shape centering on an electronic switch board.
FIG. 3A is a diagram illustrating an electrical connection (b). In the figure, the electronic switch board 13 to connect each circuit board 11 ₁ to 11 _n in a star type provided, it connects each circuit board via a connector with high-speed cable 14. Now
When data is transmitted from the circuit board 11 ₂ to the circuit board 11 _n is to connect only from the circuit board 11 ₂ Pre necessary time an electronic switch board 13 as shown in FIG. 2 (b) to the circuit board 11 _n It should be set to the driver 21 of the circuit board 11 _2, circuit board 11 for the purpose
Only the receiver 22 on _n and the path to it (if the electronic switch itself has the driving capability, only the receiver in the electronic switch and the path to it) need to be driven. Therefore, the capability of the driver 21 can be reduced, the waveform distortion at the time of transmission can be minimized, and high-speed data transmission can be facilitated.

Further, by selecting the electronic switch system and the control system thereof on the electronic switch board 13, a wide range of speeds and functions can be selected. For example, it is possible to realize a data transmission to the circuit board 11 ₂ from the circuit board 11 ₁ at the same time, the data transmission from the circuit board 11 _n-1 to the circuit board 11 _n at the same time.

FIG. 3 is a diagram showing an embodiment of a module including both communication media (bus type connection and star type connection) shown in FIG. (A) is a front view thereof, and (b) is a side view thereof.

In the figure, an electronic switch board 13 and a circuit board 11 are connected via a high-speed cable 14 with a connector. The circuit board 11, the high-speed cable with connector 14 and the back wiring board 34 are connected via a connector 35. In addition, each circuit board 11
Are connected via the bus wiring 12 on the back wiring board 34. The high-speed cable with connector 1
4 is a single core when serially multiplexing data,
In other cases, a predetermined number of cores is required. FIG. 3 shows a state in which a cooling fan 37 is added to each part described above and accommodated in a module casing 38, but various structures for supporting each part and mechanically configuring it as one module are omitted.

In the case of high-speed data in data transmission between the plurality of circuit boards 11, the transmission-side circuit board 11 → the transmission-side connector 35 → the high-speed cable 14 with the transmission-side connector → the electronic switch board 13 → the reception High-speed cable 14 with connector on the receiving side → connector 35 on the receiving side →
This is the path of the circuit board 11 on the receiving side. However, it is assumed that the electronic switch board 13 is controlled in advance so as to set a predetermined path for a required time by a predetermined method.

On the other hand, in the case of general data, the route goes from the circuit board 11 on the transmission side → the connector 35 on the transmission side → the bus wiring 12 → the connector 35 on the reception side → the circuit board 11 on the reception side. Also in this case, the transmission / reception control of the bus interface circuit of the transmission / reception board is performed by a predetermined method.

The cooling system is closed within the module in order to make the module highly independent, and the circuit board 11 is combined with the back wiring board 34 in order to perform efficient cooling. A bookshelf type mounting form is adopted. Further, the electronic switch board 13 is held over the circuit board 11 so that the cooling air for cooling the circuit board 11 is efficiently blown. This configuration is particularly effective when an ATM switch or another switch having high speed and high heat generation is used as the electronic switch because a high heat generation amount is expected.

The heat generated by the electronic switch board 13 is equivalent to that of the other circuit boards 11, the restriction on the cable length of the high-speed cable 14 with connectors is loose, and the dimensions of the electronic switch board 13 are set to be the same as those of the circuit board 11. If possible, it is possible to adopt a bookshelf type mounting form in which the electronic switch board 13 and the circuit board 11 are mixed.

FIG. 4 is a side view showing the configuration of another embodiment of the module. The configuration of the present embodiment is a module in which the positional relationship between the high-speed switch board 13 and the cooling fan 37 is reversed upside down . The other configuration is the same as that shown in FIG. 3, and the same reference numerals are given and the description will not be repeated.

FIG. 5 is a side view showing the configuration of another embodiment of the module. The configuration of this embodiment is a module in which a circuit board is divided into a high-speed circuit board 51 and a low-speed circuit board 52, and mounted on both sides of a back wiring board 53. The other configuration is the same as that shown in FIG. 3, and the same reference numerals are given and the description will not be repeated. The cooling fans 37 are provided for the high-speed circuit board 51 and the low-speed circuit board 52, respectively. Although the electronic switch board 13 is on the high-speed circuit board 51 in the figure,
It may be held over the low-speed circuit board 52. Further, as in the embodiment shown in FIG.
3 and the positional relationship between the cooling fan 37 may be vertically reversed.

FIG. 6 is a diagram for explaining the physical connection (a) and the electrical connection (b) when an electronic switch board is interconnected between a plurality of modules to constitute one device. In each of the modules 61 and 62, each circuit board 1
The electronic switch board 13 for connecting the 1 ₁ to 11 _n in a star type provided, connects each circuit board via a cable 14. The interconnection of the electronic switch boards 13 of each module is performed via a driver 63 and a receiver 64. The driver 63 and the receiver 64 are connected by one or more inter-module cables 65 according to the traffic volume.

Now, the circuit board 11 _{2 of the} module 61
When transmitting data to the circuit board 11 _n module 62 from the electronic switchboard 13 driver 63 only from the circuit board 11 ₂ required time in advance as shown in FIG. 6 (b), also the circuit from the receiver 64 It is set so as to be connected to the board 11 _n. Then, transmission data, circuit board 11 _{and second} driver modules 61 21
→ The electronic switch board 13 of the module 61 → (If necessary depending on the connection distance, the inter-module driver 63 of the module 61) → The inter-module cable 65 → (If necessary depending on the connection distance, the inter-module receiver 64 of the module 62) → Electronic switch board 13 of module 62 → receiver 2 of circuit board 11 _n of module 62
2 is transmitted.

FIG. 7 is a diagram showing an embodiment of connection between modules. In the figure, a driver / receiver required when the distance between modules is long is mounted on a circuit board 74 of modules 71 and 73, and is connected via a high-speed cable 14 with a connector. The electronic switch boards 13 of the modules 71, 72, and 73 are connected via a high-speed cable 14 with a connector. Note that a plurality of cables for connecting the modules can be installed according to the traffic volume.

The connection form of each module may be a star form or a tree form, but in each connection form, each electronic switch board 13 is controlled by a predetermined method so that a communication path between the modules is appropriately set. You.

[0028]

As described above, according to the present invention, in a digital electronic device that handles high-speed communication data, high-speed data transmission / reception in the device can be realized economically, and basic digital devices from small-scale devices to large-scale devices can be realized. The configuration can be flexibly configured by adding additional modules.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration example of a high-speed digital electronic device according to the present invention.

FIG. 2 is a diagram illustrating a physical connection (a) and an electrical connection (b) when each circuit board is connected in a star shape around an electronic switch board.

FIG. 3 shows both communication media (bus-type connection,
FIG. 2 is a diagram showing an example configuration of a module including a star connection.

FIG. 4 is a side view showing the configuration of another embodiment of the module.

FIG. 5 is a side view showing the configuration of another embodiment of the module.

FIG. 6 shows a physical connection when an electronic switch board is interconnected among a plurality of modules to constitute one device.
FIG. 3A is a diagram illustrating an electrical connection (b).

FIG. 7 is a diagram showing an embodiment of connection between modules.

FIG. 8 shows a physical connection (a) in a conventional bus-type connection;
It is a figure explaining an electrical connection (b).

[Explanation of symbols]

 Reference Signs List 11 circuit board 12 bus wiring 13 electronic switch board 14 high-speed cable with connector 21 driver 22 receiver 34 back wiring board 35 connector 37 cooling fan 38 module housing 51 high-speed circuit board 52 low-speed circuit board 61, 62 module 63 driver 64 receiver 71, 72, 73 module 74 circuit board

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/56 H04L 12/28-12/46 H04Q 3/52

Claims (3)

(57) [Claims] 1. A high-speed digital electronic device comprising: a plurality of circuit boards; and a bus wiring group connecting the circuit boards to each other in a bus via a back wiring board or a cable. An electronic switch board that connects the electronic switch board and the circuit board via the connection cable in a star shape via a connection cable, and transmits and receives high-speed data between the circuit boards via the electronic switch board and the connection via the bus wiring group. A high-speed digital electronic device having a configuration for transmitting and receiving non-high-speed data between circuit boards. 2. The circuit board according to claim 1, an electronic switch board, a bus wiring group, a cooling unit and a power supply unit, and a support structure that supports each unit are arranged in one housing. A high-speed digital electronic device characterized by being configured as a module that performs 3. The high-speed digital electronic device according to claim 2, wherein the electronic switch boards of a plurality of modules are connected by a group of cables, and the whole is configured as one device.