JPS6142984B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data exchange method in a switching system that uses both a circuit switch and a storage device.

Some switching devices use both a circuit switch and a storage device. When performing broadcast communication using such a device, data sent from a calling terminal is always sent to the required terminating line via a broadcast trunk in a circuit exchange. This is to enable simultaneous transmission of data from the broadcast trunk to multiple incoming lines and to ensure immediacy of communication. Therefore, in such a device, if there is a line on the receiving side that cannot be used for communication due to a busy call, etc., the other line immediately performs broadcast communication and data is temporarily stored in the storage device via this broadcast trunk. Regarding the lines used for stories, etc., the corresponding data is later transmitted from the storage device.

However, in such circuit switching systems, there are generally only one broadcast trunk, not many, and if the broadcast trunk is already in use, other calling terminals attempting to broadcast will be shown a standby message. transmission of data is suspended until the broadcast trunk becomes free. Therefore, when the traffic of broadcast communication is very high, the waiting time of the calling terminal becomes abnormally long, and there is a problem that the immediacy of communication is not effective. Such problems can be solved by providing multiple broadcast trunks. However, in order to do this, it is necessary to install multiple sets of broadcast switches that connect each incoming line and the broadcast trunk in a separate system from the circuit switching switch, and the control system that controls the circuit switching equipment is also complicated, so the broadcast trunk It is practically difficult to provide multiple .

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a data exchange method that shortens the waiting time of a calling terminal. The present invention uses broadcast trunks to perform instant broadcast communications when all incoming lines are idle. Also, when any of the incoming lines is busy or when the broadcast trunk is in use, the data is stored directly in the storage device without using the broadcast trunk.
By retransmitting this data to the terminating line, the frequency of use of the broadcast trunk is reduced, thereby achieving the above-mentioned purpose.

The present invention will be explained in detail with reference to Examples below.

The figure is for explaining one embodiment of the present invention, in which a line exchange 1 includes an input line circuit 3 that accepts data sent from a transmitting terminal 2 and an input line circuit that accepts data read from a storage device 4. It is equipped with two input line circuits (5). The data sent out from these input line circuits 3 and 5 is transferred to each output line circuit 7 to 7 by a line switching switch 6.
9. Broadcast trunk 10 or tone receiver 11
Allocated to trunks used for circuit switching connection control, etc. Then, data is sent from an arbitrary number of output line circuits (here, two output line circuits) 8 and 9 following the first output line circuit 7 to the intended receiving terminals 12 and 13, respectively.

Control of connection operations in such a data exchange device is performed by a control system 14 within the line exchange 1. For this purpose, the control system 14 includes various devices such as a central processing unit CPU, a randomly accessible memory device RAM, and a fixed memory device ROM.

Now, when a transmission signal is sent from the transmission terminal 2, the input line circuit 3 detects this and activates the control system 14. As a result, the control system 14 operates the line switching switch 6 to close the cross point 61 connecting the incoming line from the incoming line circuit 3 and the outgoing line to the tone receiver 11. When a broadcast dial signal is sent from the calling terminal 2 in this state, the control system 14 controls each output line circuit 7.
~9 and the connection status of broadcast trunk 10,
When both are idle, the line exchange switch 6 is operated to restore the cross point 61 and disconnect the tone receiver 11 from the input line circuit 3.
Then, instead of this, the cross point 62 is closed to connect the incoming line from the incoming line circuit 3 and the outgoing line to the broadcast trunk 10. Along with this, the control system 14 includes each output line circuit 7 to 9 and the broadcast trunk 10.
Broadcast switches 15 to 17 are closed to connect. This allows broadcast trunk 1 to be sent from calling terminal 2 to broadcast trunk 1.
0, receiving terminals 12, 1 via outgoing line circuits 8, 9
Instant broadcast communication to 3 is possible.

During broadcast communication, data is also sent to the storage device 4 via the broadcast trunk 10 and the output line circuit 7. The storage device 4 is a storage device with a relatively large capacity such as a disk storage device, and stores the data sent to the receiving devices 12 and 13, and resends the stored data when there is a terminal that cannot receive the data normally. put out That is, for example, when retransmitting to the first receiving terminal 12, the corresponding data read from the storage device 4 is sent to the input line circuit 5 dedicated to the storage device. Prior to this, the control system 14 operates the line exchange switch 6 to
Control is performed to close the cross point 63 for connecting the incoming line from the terminal and the outgoing line to the outgoing line circuit 8 necessary for retransmission. Therefore, input line circuit 5
The data sent is retransmitted to the receiving terminal 12.

Next, when the tone receiver 11 receives the broadcast dial from the calling terminal 2, if the broadcast trunk 10 is in use or the outgoing line circuits 8 and 9 connected to the receiving terminal are in use,
Furthermore, there may be a problem with these lines. In such a case, it is impossible to simultaneously send data from the broadcast trunk 10 to each output line circuit 7-9. Therefore, in this case, the control system 14 does not close the crosspoint 62 when restoring the crosspoint 61, but instead closes the incoming line circuit 3.
The cross point 64 connecting the incoming line from and the outgoing line to the first outgoing line circuit 7 is closed. Then, the data sent from the transmitting terminal 2 is stored in the storage device 4 via the first output line circuit 7. After this, if either of the output line circuits 8 and 9 to which the receiving terminal is connected is free, the control system 14
causes the storage device 4 to transmit the stored data. For example, if the second outgoing line circuit 8 is in a free state, this data is accepted by the incoming line circuit 5 and then sent to the second outgoing line circuit 8 via the cross point 63, from where the first incoming call is received. The terminal 12 is reached. If the third output line circuit 9 is empty at the stage when the first receiving terminal 12 completes data reception, the control system 14 causes the storage device 4 to transmit data with the same content again. In this state, the control system 14 is at the cross point 6.
3 has been restored, and the cross point 65 connecting the incoming line from the incoming line circuit 5 and the outgoing line to the third outgoing line circuit 9 has been closed. Therefore, the data sent from the incoming line circuit 5 now reaches the second receiving terminal 13 via the cross point 65 and the third outgoing line circuit 9.

In this way, data is transmitted to each receiving terminal 12, 13. Of course, as long as each output line circuit connected to the receiving terminal is in use, the control system 14 will stop transmitting the data output from the storage device until any output line circuit becomes vacant.

As described above, according to the present invention, instantaneous broadcast communication is possible in principle by taking advantage of the characteristics of a circuit switch. In addition, when the broadcast trunk or incoming line is busy and immediate broadcast communication is not possible, the data is first stored in the storage device, so it is possible for the calling terminal to go into standby mode while the broadcast trunk is in use. This has the effect of being able to sufficiently cope with high traffic with less traffic and sufficiently increasing the effectiveness of using equipment such as storage devices.

Although this embodiment deals with one-way communication to simplify the explanation, the present invention is also applicable to full-duplex communication and different-direction full-duplex communication. Furthermore, in this embodiment, when one of the incoming lines is busy, no immediate communication is performed with respect to the idle incoming line.
You can also do it like this: In other words, in the case of especially urgent broadcast communications, the broadcast trunk can be used even if there is a busy line on the receiving side, so that data can be sent immediately to the vacant receiving line. It's okay. This includes ROM
Two types of switching control programs are stored in the switch, and a control signal indicating that an emergency is required is sent from the calling terminal along with the dial signal.This is detected by the tone receiver in the circuit switch, and in this case, the broadcast trunk All you have to do is exchange and connect according to the program you use.

[Brief explanation of the drawing]

The drawing is a configuration diagram of an exchange system for explaining an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Line exchange, 2... Calling terminal, 4... Storage device, 6... Line switching switch, 10... Broadcast trunk, 12, 13... Receiving terminal.

Claims (1)

[Claims] 1. In a switching system that uses both a line switch and a storage device, if all called parties are ready to receive calls when making a broadcast connection, and the broadcast trunk of the line switch is not in use, the broadcast trunk will connect the called party to the called party. all lines are connected to communicate immediately, and when at least one of the called parties is in a state where it is not possible to receive a call, the data is temporarily stored in the storage device without going through the broadcast trunk, and then it becomes possible to receive a call. 1. A data exchange system characterized in that data is sequentially sent from the storage device to incoming lines to be broadcast-connected without going through the broadcast trunk.