JPH031732A - Fault monitoring system - Google Patents

Abstract

PURPOSE:To monitor a fault without stopping data transmission by providing a monitor circuit judging whether or not a fault takes place by monitoring a scramble signal based on a prescribed reference. CONSTITUTION:A transmission data sent to a data transmitter 1 is inputted to scramble circuit 3, a scramble signal is obtained and inputted to a transmission circuit 4, from which the signal is sent to a monitoring circuit 5 and a descramble circuit 6. The bit string of the scramble signal inputted to the monitoring circuit 5 is monitored as to how many umber of times logic 1 or logic 0 is consecutive and when the consecutive 1s or 0s are detected over a prescribed level, it is judged that a fault takes place. Then the fault of a data transmitter or the line is monitored without stopping the data transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fault monitoring method for monitoring faults in circuits and lines in data transmission equipment.

[Prior Art] As a conventional fault monitoring system of this type, there is one shown in FIG. Figure 2 shows, for example, Japanese Patent Application Laid-Open No. 62-22673.
This is a block diagram for explaining the conventional fault monitoring method disclosed in Publication No. 7. In the figure, (1) is a data transmission device, and (2) is a data terminal device (hereinafter referred to as "DTE").
, (4) is a transmission circuit, (7) is a line interface,
(8) is a code generator, (9) is a first selection switching circuit, (
10) is a receiving circuit, and (11) is a folding circuit, which folds back the output from the code generator (8) and inputs it to the receiving circuit (10). (12) is a second selection switching circuit, and (13) is a code checker, which checks the code of a predetermined data signal sent from the code generator (8). (14) is D T
E (2) is an input line, (15) is an output line to an external line (not shown), (16) is an input line from the external line, (
17) is the output line to D T E (2).

Further, the first selection switching circuit (9) switches the circuit to select either the transmission data signal (11) or the output of the code generator (8) and outputs it to the transmission circuit (4). The second selection switching circuit (12)
switches the circuit and outputs the output from the receiving circuit (10),
D T E (2) or code checker (13)
The decision is made as to whether or not to send the data to.

Next, the operation will be explained. D via input line (14)
The transmission data signal sent from T E (2) to the data transmission device (1) passes through the )H selection switching circuit (9), enters the transmission circuit (4), and from this transmission circuit (4) goes to the return circuit ( 11) and is sent from the line IF (7) to an external line (not shown).

In addition, when detecting a fault in the data transmission device (1), a control signal (not shown) is input to drive the code generator (8) to generate a predetermined data signal and select The circuit (9) is switched to input this predetermined data signal to the transmitting circuit (4). The predetermined data signal input to the transmitting circuit (4) is transmitted to the loopback circuit (11), where it is looped back without being transmitted to the external line, input to the receiver circuit (10), and then sent to the selection switching circuit (11). 12) is switched and input to the code checker <13). Then, a code checker 13) performs a code check to detect the presence or absence of a fault.

[Problems to be Solved by the Invention] The conventional fault monitoring method described above is configured and operates as described above, so that when detecting a fault in a data transmission device, data transmission must be stopped immediately. There was a problem that it had to be done.

The present invention has been made to solve this problem, and an object of the present invention is to provide a fault monitoring method that can monitor faults in circuits and lines of a data transmission device without stopping data transmission.

[Means for Solving the Problems] A fault monitoring system according to the present invention includes a scrambling circuit that scrambles transmission data to generate a scrambled signal, a descrambling circuit that returns the scrambled signal to the original transmission data, and a scrambled signal that converts the scrambled signal into a scrambled signal. The system is also equipped with a monitoring circuit that determines whether or not a failure has occurred based on predetermined criteria.

[Function] In this invention, the scramble circuit converts the transmission data into a scramble signal, and while this scramble signal is monitored by the monitoring circuit, the scramble signal is restored by the descramble circuit and the data is transmitted. Failures can be monitored without stopping data transmission.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a diagram showing one embodiment of the present invention. In the figure, the same reference numerals as in Figure 2 indicate the same or corresponding parts, and (3
) is a scrambling circuit that scrambles the transmission data from DTE (2) to produce a scrambled signal, (5
) is a monitoring circuit that monitors the scrambled signal transmitted from the transmission circuit (4), and (6) is a descrambling circuit that converts the scrambled signal transmitted from the transmission circuit (4) into original transmission data.

Next, the operation will be explained. D via input line (14)
The transmission data sent from T E (2> to the data transmission device (1)) is input to the scrambling circuit (3),
It becomes a scrambled signal. This scrambled signal is input to a transmitting circuit (4), and sent from this transmitting circuit (4) to a monitoring circuit (5) and a descrambling circuit (6).

The scramble signal transmitted from the transmission circuit (4) to the descramble circuit (6) is sent to the descramble circuit (6).
), the original transmission data is restored and the line IP (7)
via an external line (not shown).

In addition, the scramble signal input to the monitoring circuit (5) is
In that bit string, for example, logic "1" or logic "
The number of consecutive logic "0"s is monitored, and if logic "1" or logic "O" is detected consecutively more times than a preset value, it is determined that a failure has occurred.

As described above, it is possible to monitor failures in the circuits and lines of the data transmission device (1) without stopping data transmission.

In the above embodiment, the determination as to whether or not a failure has occurred is made based on a series of logical "1" or "0"; Judgment can be made based on whether or not it falls within this standard.

[Effects of the Invention] As explained above, in the present invention, a scramble circuit converts transmission data into a scramble signal, and while this scramble signal is monitored by a monitoring circuit, the scramble signal is restored by a descramble circuit and data is transmitted. As a result, failures can be monitored without stopping data transmission, and failures can be monitored whenever necessary.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram for explaining a conventional system. (1) is a data transmission device, (2) is a DTE, (3) is a scrambling circuit, (4) is a transmitting circuit, (5) is a monitoring circuit, (6) is a descrambling circuit, (7) is a line IP,
<14) is the input line, and (15) is the output line. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A fault monitoring method for monitoring the occurrence of a fault in each circuit or line inside the data transmission device in a data transmission device includes a scrambling circuit that scrambles transmitted data to generate a scrambled signal; The scramble circuit converts the transmitted data into a scramble signal, and the scramble circuit converts the transmitted data into a scramble signal. is monitored by the monitoring circuit, and the scrambled signal is restored by the descrambling circuit for data transmission.