JPH0722419B2 - A method for accommodating input / output terminal devices in a time-sharing electronic exchange - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for accommodating an input / output terminal device in a time-division electronic exchange, and in particular, it is suitable for accommodating an input / output terminal device. Regarding the scheme.

[Prior Art] A central processing unit of an automatic electronic exchange includes an input / output terminal device for performing maintenance and operation management of the exchange, an input / output terminal device for exchanging information with a processor performing ancillary services of the exchange, and the exchange. A large number of input / output terminal devices such as an input / output terminal device for a service function performed by itself may be connected. When connecting a large number of input / output terminals, the number of input / output control devices corresponding to the number is required.

Generally, channel devices or I / O are used to expand the configuration of the central processing unit to provide multiple I / O controllers.
The processor is used. For example, Japanese Patent Application Laid-Open No. 60-91796 describes a conventional technique using an I / O processor.

[Problems to be solved by the invention]

In the above-mentioned conventional technique, a corresponding input / output control device is provided in the central processing unit for each input / output terminal device. The number of input / output control devices that can be provided is determined as the maximum capacity of the central processing unit due to electrical restrictions or physical / implementation restrictions. Therefore, in the above-mentioned conventional technique, the central processing unit of the automatic exchange, which may connect a large number of terminals, becomes large in size even if it is not actually connected, and the device is expanded for the addition of input / output terminal devices. There is also the problem that it is not easy.

It is an object of the present invention to provide a method for accommodating an input / output terminal device in a time-division electronic switch, which makes it easy to add an input / output terminal device without enlarging the central processing unit of the automatic exchange.

[Means for solving problems]

The above-mentioned object is to provide an input / output terminal interface device provided for the input / output terminal device accommodated in the time division electronic exchange,
Connect to the input / output control device using the PCM highway via the time division exchange switch, and use the empty time slot of the PCM highway to transmit / receive data between each input / output terminal device and the input / output control device. This is achieved by time-division multiplexing.

[Action]

Since input / output data for a large number of input / output terminal devices are time-division multiplexed and this is assigned to each input / output terminal device by a time-division exchange switch, at least one input / output control device is required. It is possible to add an input / output terminal device to be accommodated without being restricted by the number of devices.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a time division automatic exchange system to which an embodiment of the present invention is applied. In FIG. 1, the central control system includes an input / output control device 1, a terminal interface control device 5, a control processing device 8, and a memory device 9 storing programs and data for the control processing device 8. Prepare,
These are connected to each other by a common bus 7. The common bus 7 is used during normal program execution. The time division exchange switch 3 is connected to this common bus 7
It is connected to the input / output control device 1 by the M highway 2a. The time division exchange switch 3 is also connected to a large number of various input / output terminal interface devices 4 (only one is shown) by the PCM highway 2b. Each input / output terminal interface device 4 is connected to the terminal interface control device 5 of the central control system, and is also connected to the corresponding input / output terminal device 6 (only one is shown). In this exchange system, by executing the exchange program, an appropriate control command is issued to each input / output terminal interface device 4 via the terminal interface control device 5 or directly to the time division exchange switch 3 to perform the exchange operation. Done.

When transmitting / receiving data between the input / output control device 1 and each input / output terminal device 6, the control processing device 8 writes the data to be output to the memory device 9 and uses the input / output terminal interface device 4 A control command for connecting between the I / O control device 1 and the input / output control device 1 is sent to the time division exchange switch 3 to complete the preparation.

Next, a data transfer start instruction is issued from the control processing device 8 to the input / output control device 1. The input / output control device 1 reads the output data from the memory device 9 and specifies the specified PCM.
It is multiplexed and placed in the time slot on highway 2a.
The input / output terminal interface device 4 receives the output data from the designated time slot on the PCM highway 2b, converts it into a signal for the corresponding input / output terminal device 6, and sends it to the input / output terminal device 6.

The data input from the input / output terminal device 6 is detected by the input / output terminal interface device 4 to which the input request corresponds first. When the control processing device 8 detects this, it sends a command for connecting the input / output terminal interface device 4 and the input / output control device 1 to the time division exchange switch 3.

Connection of time division exchange switch 3 and PCM highway 2 used
When the designation of b and the time slot is completed, the transmission permission is given to the input / output terminal device 6 and the input of data is started. The input data from the input / output terminal device 6 is put on the PCM highway 2b and the time slot designated by the input / output terminal interface device 4, and is input to the input / output control device 1 via the time division switch 3 and the PCM highway 2a. Reach The input / output control device 1 sequentially writes the received data in the buffer area in the memory device 9 which is reserved in advance. The end of the series of data is assumed to be by a predetermined specific character, and when the input / output control device 1 receives the corresponding character, it issues an interrupt to the control processing device 8 to complete the reception of the input data. Inform.

Next, details of data transmission / reception between the time division exchange switch 3 and the input / output control device 1 described above will be described with reference to FIG.
FIG. 2 is a detailed configuration diagram of the input / output control device 1. The input / output control device 1 is a CP connected to the common bus 7 of the central control system.
U11, buffer memory 12 and time slot memory 10,13
A reception buffer 14, a transmission buffer 15, a local memory 16, and a local bus 17 interconnecting these,
It comprises a reception gate 18 and a transmission gate 19 connected to the PCM highway 2a.

The control processor 8 specifies the input / output controller 1, writes the time slot number to be used for transmission and reception in the buffer memory 12 via the common bus 7, and then interrupts the CPU 11. CPU
The buffer 11 reads the contents of the buffer memory 12 and writes it in the predetermined time slot memories 10 and 13. The reception gate 18 and the transmission gate 19 are respectively connected to the time slot memory 1
At the time of the time slot indicated by the contents of 0 and 13, the PCM
The data on the highway 2a is taken and sent to the reception buffer 14, or the contents of the transmission buffer 15 are sent to the PCM highway 2a. When the reception buffer 14 is filled with the data of the time slot, the CPU 11 reads it and determines whether or not there is a termination character. If it is not the termination character, the data of the time slot is written to the predetermined address of the memory device 9 (FIG. 1) by using the direct memory access function of the common bus 7. The address is incremented by +1 every time. If the content of the reception buffer 14 is the termination character, the CPU 11 interrupts the control processing device 8 to inform that the reception is completed and the number of received characters. The control processing device 8 receives the input data stored from a predetermined address of the memory device 9, and next designates another address.

On the other hand, in the case of transmission, the control processing device 8 writes the transmission data in order on the memory device 9 and transfers it to the CPU 11 via the buffer memory 12 with the interrupt, the number of transfer data words, and the head address where the data is stored. . The CPU 11 reads the transmission data word by word from the memory device 9 by direct memory access every time the data is output from the transmission buffer 15 to the PCM highway 2a, and then the PCM highway 2a.
It is written in the transmission buffer 15 as the data to be output to.

As described above, the control processing device 8 inputs / outputs data to / from any time slot of the PCM highway 2a by using the input / output control device 1 shown in this embodiment.

Next, details of data transmission / reception between the time division exchange switch 3 and the input / output terminal interface device 4 will be described with reference to FIG. FIG. 3 is a detailed configuration diagram of the input / output terminal interface device 4. The input / output terminal interface device 4 is a CP
U20, a local memory 23, a buffer memory 21 connected to the terminal interface control device 5, an asynchronous terminal interface 22 connected to the corresponding input / output terminal device 6, time slot memories 24 and 25, and a reception buffer 2
6 and a transmission buffer 27, a local bus 28 interconnecting them, and a reception gate 29 and a transmission gate 30 connected to the PCM highway 2b.

The time division exchange switch 3 can exchange between arbitrary time slots of an arbitrary highway. For control so that the data can be placed in an arbitrary empty time slot of the PCM highway 2b accommodating the input / output terminal interface device 4 to which the input / output terminal device 6 desired to input / output data is connected. The processing device 8 passes through the common bus 7,
A control command is sent to the time division exchange switch 3. Further, the control processing device 8 transmits the time slot number in which the data is placed to the input / output terminal interface device 4 via the terminal interface control device 5. The time slot number is written in the buffer memory 21, read by the CPU 20, and further written in the time slot memories 24, 25. The reception gate 29 fetches the data loaded on the PCM highway 2b into the reception buffer 26 at each time of the corresponding time slot designated in the time slot memory 24. When the receive buffer 26 is full of data, the CPU 20 reads it and
It is sent to the input / output terminal device 6 through the asynchronous terminal interface 22. The input data from the input / output terminal device 6 is
After being written in a buffer (not shown) in the asynchronous terminal interface 22, it is read by the CPU 20 and rewritten in the transmission buffer 27. The transmission gate 30 puts the contents of the transmission buffer 27 on the PCM highway 2b at the time of the time slot designated in the time slot memory 25. In this way, the input data is put on the PCM highway 2b, and as described above,
It is transmitted to the input / output control device 1 via the time division exchange switch 3 and used by the control processing device 8. Since the time division exchange switch 3 can arbitrarily select the input / output terminal interface device 4, it is easy to change the input / output terminal device.

〔The invention's effect〕

According to the present invention, since at least one input / output control device is required, the configuration of the central processing unit is simplified, and when adding the input / output terminal device to be connected, it is not necessary to add the input / output control device. Therefore, it is easy to add an input / output terminal device, and it is possible to achieve standardization and economy.

[Brief description of drawings]

FIG. 1 is a block diagram of a time division exchange system to which an embodiment of the present invention is applied, FIG. 2 is a detailed block diagram of an input / output control device shown in FIG. 1, and FIG. 3 is an input / output shown in FIG. It is a detailed block diagram of a terminal interface device. 1 ... I / O controller, 2a, 2b ... PCM highway, 3 ...
... time division exchange switch, 4 ... input / output terminal interface device, 6 ... input / output terminal device, 8 ... control processing device.

Claims (1)

[Claims] 1. An input / output terminal interface device provided corresponding to an input / output terminal device housed in a time division electronic exchange,
Connect to the input / output control device using the PCM highway via the time division exchange switch, and use the empty time slot of the PCM highway to transmit / receive data between each input / output terminal device and the input / output control device. A method for accommodating an input / output terminal device in a time division electronic exchange characterized by performing time division multiplexing.