JPS5853252A - Fault detecting system - Google Patents

Abstract

PURPOSE:To detect a faulty communication system without cutting off the communication system, by providing a means to add a check signal to the data given from the own end office. CONSTITUTION:The data A1 given from a data generating part 16 of an end office 1 is sent to end offices 2 and 3 from a transmitting part 11 via an OR circuit 15. At the same time, receiving parts 12 and 13 receive data (B1, b2 and b3) and (c1, c2 and C3) from the end offices 2 and 3 and checks the received data through a discriminating circuit 14. Then check signals a2 and a3 showing the result of check are added to the data A1 to be sent to the offices 2 and 3. Thereafter the same check is given also to the offices 2 and 3. When the result of discrimination of the office 1 is confirmed by the received data B1 and the check signal c2, the transmission system of a route R2 is decided to normal. While the route R2 is decided faulty if no confirmation is obtained for the B1 and c2 although the c1 and b3 are confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fault detection method for detecting the occurrence of a fault in multiplex intercommunication.

In the case of the same communication between terminal stations, it is relatively easy to detect a failure in the hex-11 system. However, in the case of multiplex mutual communication in which a plurality of terminal stations are used as counterpart stations and data is transferred between each terminal station, detecting a failure in the communication system becomes extremely difficult. For example, A, B
There are three terminal stations, A and C, from the A terminal to the B and C terminals, from the B terminal to the A and C terminals, and from the C terminal to the A, & B terminals. When a failure occurs in a system that sends and receives data to and from terminal stations, it is extremely difficult to determine whether the cause of the failure is the sending side or the receiving side. For this reason, in the past, a method was used in which the above-mentioned mutual communication linkage system was disconnected and the communication system was disconnected, which had the disadvantage that the legitimate communication system was also disconnected and communication in that system was also stopped.

The present invention has been made to solve the above-mentioned drawbacks.
The objective is to provide a fault detection method that makes it easy to detect faults.

The present invention provides a system in which a terminal station of ξ1, a second terminal station, and a third terminal station are connected. means for determining the received data and generating a confirmation signal; means for adding and transmitting the confirmation signal after the data sent from the terminal station; - receiving from the terminal station; A means for determining whether the transmission/reception is correct by comparing the received data and the confirmation month related to the received data is provided in the terminal station 2-1, the second terminal station, and the terminal station g3, respectively. This fault detection method is characterized by the provision of both methods.

Hereinafter, the present invention will be explained with reference to the drawings. The drawing is a block diagram illustrating an embodiment of the present invention, in which 1.2.3 is a terminal station, 11.22.33 is a transmitter, and 12.13.21.2 is a block diagram illustrating an embodiment of the present invention.
3.31.32 is the receiving section, 14.24.34 is the discriminating section,
15.25.35 is an OR circuit, 16.26.36 is a data generation section, 17.27.37 is a detection section, A4, Bl
, C1 is data, C2, C9, b+ , bs , C1,
Ct is a check signal, D is an abnormal signal, E is an error signal,
R1% R2, R@ is the root. Terminal stations 1, 2 and 3 in the drawing have the same transmitting and receiving functions, for example, terminal station 1
The data 80 sent from the terminal station 2 and 3 is simultaneously sent to the other terminal stations 2 and 3, and after this data A1, the data (Bl and C1) sent from the other terminal stations (2 and 3)
IΣ fraud, that is, terminal stations 1, 2 and 3, is a communication method that adds and sends the number of months (b, , c, ).
are located at each vertex of a triangle, and simultaneously send data to 2M, i stations, Ii4.

In the drawing, data A1 from the data generating section 16 of the terminal station 1 passes through the OR circuit 15 and is sent out from the sending/m section 11 to the terminal stations 2 and 3. 'Furthermore, the receiving sections 12 and 13 of the terminal station 1 receive the data (B+N b
2- bs) Kumi”, CI % 02 % C3) is received. The determining unit 14 checks the received data from the terminal stations 2 and 3, and outputs check signals a2 and C3 indicating the results. These check signals a2 and a are sent to the other stations (terminal stations 2 and 3) following the data A1 described above.The above is the operation of station 1 for 'y1. The same operation is performed also in and 13
(Terminal station 1), the receiving section 23 (Terminal station 2), and the transmitting section 33 (Terminal station 3) are connected to each other) R8 is checked at the terminal station 1. Furthermore, the terminal station 2 checks the routes R0 and R3, and the terminal station 3 checks the routes R0 and R7.

As a result of the determination in the determination unit 14 of the terminal station 1, if the received data B1 and the check signal c2 are confirmed, the communication system (including the transmitting unit and the receiving unit 4d, the same applies hereinafter) is normal. .

Further, if the data C and the check signal S are confirmed, but the data B and the check signal C1 are not confirmed, this indicates that an abnormality has occurred in the route R1. Further, if both the data B and the check signal c2 and the data C8 and the check signal b3 cannot be confirmed, it becomes clear that an abnormality has occurred in the route R1. Similar determination operations are performed in other terminal stations, so a description thereof will be omitted.

It has the advantage of being able to operate without impairing reception.

[Brief explanation of the drawing]

4- The symbols used in the figures are as follows. 1.2.3 is a terminal station, 11.22.33 is a transmitter, 12.
13.21.23.31.32 is a receiving section, 14.24.
34 is a discrimination unit, 15.25.35 is an OR circuit, 16.2
6.36 is the data generation section, 1727.37 is the detection section, A
I, B1%C, O is data, C2, as, b, , ba
, CI, C2 is a check signal, D is an abnormal signal, E is an error signal, R,, R2, R. indicates the route. ″(Two Seasons ゛ji “j

Claims (1)

[Claims] In a system in which a first terminal station, a 592 terminal station, and a third terminal station are connected and data is transferred between the valley terminal stations, means for receiving data from another terminal station; means for determining received data and generating a confirmation signal; means for adding and transmitting the confirmation signal after the data sent from the own terminal station; and an Ij4A confirmation signal regarding the data received from the other terminal station A failure detection method uses a means for determining whether transmission and reception are correct or incorrect at the first terminal station and the second terminal station, respectively, as a percentage sign.