JPH0563761A - Line fault detection system - Google Patents

Abstract

PURPOSE:To quickly find out a fault of a transmission line. CONSTITUTION:A sender side transmission section is provided with a time information addition section 1, which adds a time information signal to data and sends the result, data and the information signal are separated through a time information detection and signal separations section 3 provided in a receiver side reception section and the content of the time information signal is sent to a control section 2. The control section 2 awaits the processing by a designated time till succeeding data comes to the time information addition section 1, and when the time information signal added to a head of the succeeding data is not normally sent, re-transmission is made and discrimination of alarm is given. Thus, intermission of data on its way is not caused and even when a transmission line is physically disconnected, it is detected as a fault.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device having a bidirectional communication function, and more particularly to a line fault detection system for the purpose of detecting a line fault.

[0002]

2. Description of the Related Art There are many known methods for monitoring an abnormal state of a communication line when transferring data using a telephone line. However, when transmitting data, disconnection of the data during the transmission is known. The line failure cannot be detected due to the above, and it is necessary to always send a constant data signal from the monitoring device. In order to detect a failure of a line while data is stopped, a method has been proposed in which constant signals are constantly monitored by a monitoring device, and when a failure occurs in the line, the transmission signal is cut off.

[0003]

Conventionally, when the data being transmitted is stopped during communication and the data is not being transmitted, the reason for the stop of the data is unknown, and the transmission side device is abnormal. , It was not possible to distinguish whether it was due to a line failure. Although the data sending side could check how well the game received the data, it had no way to temporarily stop the data transfer to the game due to the circumstances of the sending side.

The present invention has been made in order to solve the above problems inherent in the prior art. Therefore, the object of the present invention is not to obstruct by sending the time when data is stopped in advance to the game device. It is possible to recognize in advance that the time information until the data is transmitted again can be known in advance, so it is easy to determine whether the data is stopped due to an error in the transmitting device or the line failure. It is to provide a new line fault detection method that enables the determination.

[0005]

In order to achieve the above object, the line fault detecting method according to the present invention is designed to specify a data transmission time as means for recognizing an abnormal state of a game, so that one of the circumstances can be achieved. When there is a time when data cannot be sent temporarily, it is possible to stop the transfer of data for a certain period of time based on each situation, and the data generation unit of the transmission side device determines the next data Time information until sending = Providing means for adding a time information signal and sending it to the game, and the game apparatus is provided with a detecting unit for reading the time information data in addition to the data, until the next data is sent. Notifying the time to the control device, the control device of the game receiving the time information continues to wait for the next information when the time information is normally received,
If data or time information is not sent even at the time specified in advance, request a resend to the sender,
It is characterized by waiting for the time information and data to be retransmitted, and detecting a line abnormality when the time information is not sent from the transmission source when a request for retransmission is made once or a plurality of times.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the accompanying drawings with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

Referring to FIG. 1, reference numeral 6 indicates a transmitting side device, and 7 indicates a receiving side device. The transmitting side device 6 and the receiving side device 7 respectively include a time information adding section 1 and a time information detecting section. 3 are provided respectively. Reference numeral 8 is a terminal for inputting a data signal from the exchange, and the data signal is for adding time information to the data once by the control unit 2,
It goes through the time information adding unit 1 to the transmission line 4 which is a transmission line. If the transmission line 4 is normal, the data passes through the opposite device, that is, the time information detecting unit 3 of the receiving side device 7, the data goes to the exchange side, and the time information is taken in by the time information detecting unit 3 and the exchange side. Is not output to. Time information detector 3
The time information taken in is confirmed by the control unit 2, and the control unit 2 waits until the next data comes.

FIG. 2 is a block diagram showing an example of the system configuration using the device according to the present invention. A device utilizing the present invention is connected between the in-house switchboard and a dedicated line to establish a call and signaling.

FIG. 3 is a diagram showing operating signals in the system shown in FIG.

Referring to FIG. 3, when transmitting data on the transmission line 4, a time information signal 13 indicating the time until the next data is added to the beginning of the data 14 and transmitted to the opposite station. To do. The reception side transmits the normal reception response signal 16 to the transmission side when the time information signal can be confirmed. In some cases, the call path is in a state 15 that is open until the next data. When the time information signal 13 is not received by the receiving side, the retransmission request 18 is sent to the transmitting side. At the transmitting side, when the retransmission request 18 is received, the time information signal 1
9 and data 20 are transmitted. Here, if the time information signal is not sent to the receiving side, a re-transmission request is made or a line abnormality state is output to the outside.

[0012]

As described above, according to the present invention,
Since the time to use one communication line can be known in advance and the idle state of the line can be determined, it becomes possible to provide the communication line to other devices during the time period when the line is idle. Moreover, when a line failure occurs, not only can the failure be detected because the data is stopped, but when the data is intentionally stopped, there is time until the next data transmission starts based on the time information immediately before that. Knowing that, it is possible to confirm that the data stop is a temporary stop rather than a failure.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a system configuration example using the present invention.

FIG. 3 is a diagram showing operation signals in the system shown in FIG.

[Explanation of Codes] 1 ... Time information addition unit 2 ... Control unit 3 ... Time information detection unit 4 ... Transmission line / transmission side transmission line 5 ... Transmission line / transmission side reception line 6 ... Transmission side device to which this method is applied 7 ... Receiving side device to which this method is applied 8 ... Data input point from switching device 9 ... Data terminal device (sending side) 10 ... Switching device (sending side) 11 ... Switching device (receiving side) 12 ... Data terminal device 13 ... Time information signal 14 ... Data 15 ... Line idle state 16 ... Normal reception response signal 17 ... Line indeterminate state 18 ... Retransmission request 19 ... Time information signal sent by resend request 20 ... Retransmitted data

Claims (1)

[Claims] 1. A start point at which a second data signal is sent to a data signal to be sent to a transmission side in a transmission device for sending and receiving a continuous or discontinuous data signal. The time information adding means for adding time information up to is provided, the receiving unit separates and extracts the time information from the data signal, and compares the time information signal with the previously received time information signal, and if there is a match, the data is normally received. And the time information signal have been received, the data transmitter is notified, and if they do not match, the data transmitter is requested to retransmit the data once or multiple times, and if no data is retransmitted thereafter. A line failure detection method characterized by sending line abnormality information.