JPS60220643A - Data switching system - Google Patents

Abstract

PURPOSE:To restart communication without recalling of a terminal whose channel is interrupted, by storing connection information before interruption in a connection destination storage circuit at a communication interruption time and reading out stored connection information to set a channel when communication is restarted. CONSTITUTION:Data terminals 101 and 105 are connected to a time division channel switch SW205 in a data exchange 103 through line concentrating and multiplexing devices 102 and 104. If a communication interruption signal from the terminal 101 which is performing communication is detected by a communication interruption detecting circuit 203, the circuit 203 reports interruption to a processor 201. When receiving the channel interruption report, the processor 201 stores connection information of terminals 101 and 105 in a connection destination storage circuit 202 and releases a channel bus of the SW205. When a communication restart signal from the terminal 101 is detected by a communication restart detecting circuit 203 at a communication restarts time, the circuit 204 reports the communication restart to the processor 201. When receiving this report, the processor 201 reads out connection information stored in the circuit 202 and controls the SW205 to set a channel bus and commands a connection completion reporting circuit 206 to transmit the connection completion report to the terminal 105.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a data exchange system, and more particularly to a data exchange system that allows communication in a non-storage type data exchange to be interrupted and restarted without disconnecting a call.

Prior Art Conventionally, in non-storage type data exchange equipment, prior to a single communication, a call is set up according to certain procedures such as calling and dialing, and a communication path is established between arbitrary terminals via a communication path switch. The communication path is set to be disconnected at 8 o'clock at the end of one communication, and a fee will be charged according to the connection time.

Therefore, when communication between terminals is resumed after it has been interrupted, it is necessary to set up a call again according to a certain procedure such as dialing when communication is resumed. In other words, if you do not open the 0 communication path, which has the drawback of having to set up the communication path from the beginning, including the terminal, each time you want to communicate, you can resume communication at any time, but 1 communication path is wasted. In addition, you will be charged for non-communication time.

OBJECTS OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional drawbacks and to provide a data exchange system that does not require new call setup when communication is restarted after communication is interrupted.

Structure of the Invention The data exchange system of the present invention includes a communication path switch for setting a communication path bus between arbitrary data terminals, and an i-control device that controls the communication path switch and sets the communication path. A non-storage type data exchanger comprising: a communication interruption detection circuit for detecting a communication interruption signal; a communication restart detection circuit for detecting a communication restart signal; The present invention is characterized in that it is equipped with a connection destination storage circuit for storing connection destinations, so that a terminal whose communication path is interrupted can resume communication without calling again.

Embodiments of the Invention Next, the present invention will be described in detail with reference to the drawings.

The figure is a block diagram showing one embodiment of the present invention. That is, data terminals 101 and 105 are connected to data exchange 103 via line concentrators 102 and 104, respectively.
A processing device 01 is connected to the time-division channel switch 205, and the time-division channel switch 2
05 is controlled, and the data terminal 101
105 is set up, and when the communication ends, the communication path is released, as in the conventional case. The time division channel switch 205 may be a space division type exchange.

However, in this embodiment, the communication interruption detection circuit 203
and a communication restart detection circuit 204, which monitors signals on the communication path. A communication interruption signal sent from the data terminal 101 during communication, for example, when all the envelope data is "1" and the S bit is When the communication interruption detection circuit 203 detects an off signal, it notifies the processing device 201 of the interruption.When the processing device 201 receives the communication path interruption notification, it stores the connection information of the data terminals 101 and 105 in the connection destination storage circuit 202. The communication path of the 1-time division communication path switch 205 is opened.Of course, the opened communication path can be used as a communication path between other terminals.

When restarting communication, the communication restart signal sent from the data terminal 101, for example, all the envelope data is “
When the communication resumption detection circuit 204 detects the signal ``with the S bit turned on at ``l'', it notifies the processing device 201.The processing device N201 receives the data terminal 101 stored in the connection destination storage circuit 202 based on the notification. and 105, controls the time division communication path switch 205 to set a communication path, and instructs the connection completion notification circuit 208 to send a connection completion notification to the data terminal 105.Connection completion notification The connection completion notification from the circuit 206 is a communication enable signal for the data terminal 105;
When it receives this signal, it enters the communication state and data terminal 1
Data communication between 01 and 105 is resumed.

This embodiment has the advantage that there is no need to set up a new call when communication is restarted after communication is interrupted, and the communication path of the time-division channel switch can be used for other communications while communication is interrupted. Therefore, there is no charge for the time during communication interruption.

Effects of the Invention As described above, in the present invention, when a trading transaction is interrupted, the connection information before the interruption is stored in the connection destination storage circuit, and the communication path of the time-division communication path switch 205 is opened and communication is resumed. Since the configuration is configured such that the connection information stored in the connection destination storage circuit is read at the time of communication and the communication path is set, it is not necessary to set up the call again when communication is restarted, making it easy to restart one communication, and also to prevent communication interruption. There is an advantage that the communication path such as a time division communication path switch can be used for other communications.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention. In the figure, 101.105=data terminal, 102,1
04: Concentrator multiplexer, 103: Data exchanger, 20
1: Processing device, 202: Connection destination storage circuit, 203: Communication interruption detection circuit, 204: Communication restart detection circuit, 205;
Time division communication path switch, 20B = connection completion notification circuit. Applicant: NEC Corporation Agent: Patent Attorney: Toshimune Sumita

Claims (1)

[Claims] Communication interruption occurs in a non-storage type data exchange equipped with a communication path switch for setting a communication path between arbitrary data terminals and a processing device that controls the communication path switch and sets the communication path. a communication interruption detection circuit for detecting a signal; a communication restart detection circuit for detecting a communication restart signal; and a connection destination storage circuit connected to the processing device and storing the connection destination before the communication path was interrupted. A data exchange method characterized in that a terminal whose communication path is interrupted can resume communication without calling again.