JPH05235907A - Error counter circuit monitor - Google Patents

Abstract

PURPOSE:To execute the confirmation of an operation of the counter circuit to transmission data through a transmission line even when the monitor is in operation. CONSTITUTION:A specific pattern generating circuit 1 generates a specific pattern S2 and an error insertion circuit 2 inserts an error in the pattern. A selection circuit 3 selects either a specific pattern S3 with the error inserted thereto or a data signal S1 and sends the selected signal to a transmission line 11. An error counter circuit 4 detects and counts an error bit from transmission data of the transmission line 11A special pattern detection circuit 5 detects an output pattern of the special pattern generating circuit 1 and its output S6 is changed, then an inhibit circuit 6 suppresses the count result S5 thereby preventing mis-resistance by the a monitor system such as the monitor due to the result of count of the counter circuit for the confirmation of operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an error counting circuit monitoring device, and more particularly to a device for monitoring the normality of a counting circuit for detecting and counting errors in transmission data on a transmission line including a transmission device.

[0002]

2. Description of the Related Art Conventionally, in an error counting circuit included in a device for monitoring a transmission line error, whether or not the error counting circuit normally operates due to the occurrence of an error is monitored when the device is in an operating state. Since the operation of the error counting circuit cannot be confirmed unless the error occurs, it was not carried out.

[0003]

In the operation monitoring means of the conventional error counting circuit, the circuit operation is not checked while the device is operating, and therefore the operation cannot be monitored until an error occurs in the transmission line. Even if the error counting circuit is in a failure state, the failure state cannot be detected.

For example, in a redundant transmission line having a working protection, even if the error counting circuit on the protection side is in a failure state, the failure of the error counting circuit cannot be detected.
There was a drawback that it would switch to the spare side.

[0005]

A first error counting circuit monitoring apparatus according to the present invention is an apparatus for checking the operation of an error counting circuit that counts errors in transmission data on a transmission line, and a specific pattern including a bit error is detected. A special pattern generation error inserting means for generating a signal, a signal of the specific pattern and a data signal to be transmitted through the transmission line are input, and are input according to a supervisory control signal designating an operation confirmation test of the error counting circuit. Selecting means for selecting one of the signals and transmitting it to the transmission line to which the error counting circuit is connected,
Special pattern detecting means for detecting the specific pattern signal from the transmission path, and inhibit means for receiving the detection output of the special pattern detecting means and suppressing the transmission of the error detection output of the error counting circuit to the device monitoring system. ing.

A second error counting circuit monitoring device according to the present invention is a device for confirming the operation of an error counting circuit for counting errors in transmission data on a transmission line, and a special pattern for generating a signal of a specific pattern including a bit error. Any of the signals input in response to a supervisory control signal for inputting a generation error insertion means, a signal of the specific pattern and a data signal transmitted through the transmission line and designating an operation confirmation test of the error counting circuit. A selection means for selecting one of them and sending it to the error counting circuit, and an inhibiting means for suppressing the transmission of the error detection output of the error counting circuit to the device monitoring system according to the monitoring control signal are provided.

[0007]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention. Special pattern generation circuit 1, error insertion circuit 2
The selection circuit 3 constitutes a transmission side 10, the error counting circuit 4, the special pattern detection circuit 5 and the inhibit circuit 6 constitute a reception side 12, which are connected to each other by a transmission line 11.

Next, the operation will be described. The special pattern generation circuit 1 on the transmission side 10 generates a signal of a certain specific pattern, that is, the special pattern S2, and the error insertion circuit 2 generates and inserts a bit error in this special pattern S2. The selection circuit 3 includes a special pattern S3 in which an error has been inserted or a data signal S1 to be transmitted, which corresponds to the value of the supervisory control signal S0 that specifies an operation confirmation test of the error counting circuit 4 from a device control circuit (not shown). Either of them is selected and sent to the transmission line 11. Here, the data signal S1 and the special patterns S2 and S3 have an error detecting function such as a parity bit.

The error counting circuit 4 on the receiving side 12 is connected to the transmission line 1
Data signal S1 or special pattern S received from
The error bit is detected from 3, the counting is performed, and the counting result S5 is output. As a result, the normality of the error counting circuit 4 can be confirmed. On the other hand, the special pattern detection circuit 5 monitors the data on the transmission path 11 and detects the special pattern S2 output from the special pattern generation circuit 1 on the transmission side 10. Here, even if an error is inserted in the special pattern S2 (that is, even if it is the special pattern S3), it has a function of detecting the special pattern. When the special pattern detection circuit 5 detects the special pattern S2, it recognizes that the operation check test for the error counting circuit 4 is being performed, and changes the output S6,
The inhibit circuit 6 suppresses the error counting result output S5 of the error counting circuit 4 from being transmitted to the monitoring system of the apparatus.

In order to monitor the error counting circuit 4 on the protection side in the transmission line 11 having working / protection, for example, the transmission side 10 periodically selects the special pattern S3 containing an error as the output S4 of the selection circuit 3. .. On the receiving side 12,
The error counting circuit 4 counts the errors inserted on the transmitting side 10 and outputs a counting result S5. At the same time, the special pattern detection circuit 5
Detects a special pattern and outputs the output S5 to the inhibit circuit 6
To prevent the influence of the counting result of the operation check test of the error counting circuit 4 on the monitoring system of the device.

If the transmitting side 10 does not select the error-inserted special pattern S3, that is, if the normal data signal S1 is selected, the inhibit circuit 6 does not suppress the counting result S5 and the monitoring result. Since it is transmitted to the monitoring system as S7, it is possible to monitor the normality of data transmission on the transmission side 10 and the transmission path 11.

FIG. 2 is a block diagram showing a second embodiment of the present invention. This embodiment shows an example applied only to the receiving side of the transmission line 15, and has a special pattern generating circuit 1, an error inserting circuit 2, a selecting circuit 3, an error counting circuit 4 and an inhibit circuit having the same functions as those of the embodiment of FIG. It consists of six. The difference from the embodiment of FIG. 1 is that as the selection circuit 3 side and the error counting circuit 4 side are in the same device, it is a special means for recognizing that the error counting circuit 4 is undergoing an operation confirmation test. That is, the supervisory control signal S0 is directly input to the inhibit circuit 6 via the control signal line 13 without requiring the pattern detection circuit 5.

Next, the operation will be described. The selection circuit 3 includes the special pattern S3 including the bit error generated by the special pattern generation circuit 1 and the error insertion circuit 2, and the transmission line 1.
The data signal S1 received from the input terminal 5 is input, and one of them is selected according to the value of the monitor control signal S0 and is sent to the error counting circuit 4. The error counting circuit 4 counts the errors in these signals S1 or S3 and outputs a counting result S5. Thereby, the normality of the error counting circuit 4 can be confirmed.

On the other hand, when the supervisory control signal S0 indicates the operation confirmation test of the error counting circuit 4, the inhibit circuit 6 does not transmit the counting result S5 to the device monitoring system, but performs the operation confirmation test of the error counting circuit 4. Only when not shown, that is, when the normal monitoring of the data signal S1 is shown, the counting result S5 is transmitted to the device monitoring system as the monitoring result S7.

Also in the second embodiment, it is possible to monitor the error counting circuit on the spare side in the transmission line having the working / spare by periodically changing the monitor control signal S0.

[0017]

As described above, the first error counting circuit monitoring apparatus according to the present invention sends a special pattern in which an error is inserted according to a monitoring control signal designating an operation check test of the error counting circuit on the transmitting side. Then, the operation check is performed by actually operating the error counting circuit on the receiving side, and at the same time, the special pattern detecting means detects this special pattern to make the receiving side recognize that the error counting circuit is being tested. Since the influence of the counting result of the operation test of the error counting circuit on the device monitoring system is prevented, the operation check of the error counting circuit can be performed at any time, and the occurrence of failure can be detected early. Further, it is possible to detect a failure in the error detection circuit on the spare side in the redundant transmission line.

Also, the second error counting circuit monitoring device according to the present invention also actually operates the error counting circuit with a special pattern in which an error is inserted according to the monitoring control signal to perform an operation check, and at the same time, this monitoring control signal. Recognizes that the error counting circuit is being tested, and prevents the counting result of the error counting circuit operation test from affecting the device monitoring system.
It has the same effect as above.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1 special pattern generation circuit 2 error insertion circuit 3 selection circuit 4 error counting circuit 5 special pattern detection circuit 6 inhibit circuit 11, 15 transmission path

Claims (2)

[Claims] 1. A device for checking the operation of an error counting circuit that counts errors in transmission data on a transmission line, and a special pattern generation error inserting means for generating a signal of a specific pattern including a bit error, and a signal of the specific pattern. And a data signal to be transmitted through the transmission line are input, and one of the input signals is selected according to a supervisory control signal that specifies an operation confirmation test of the error counting circuit, and the error counting circuit is connected. Selection means for sending to the transmission line, special pattern detection means for detecting the specific pattern signal from the transmission line, and device monitoring system for receiving the detection output of the special pattern detection means and the error detection output of the error counting circuit. An error counting circuit monitoring device, comprising: inhibit means for suppressing transmission to the error counting circuit. 2. A device for checking the operation of an error counting circuit that counts errors in transmission data on a transmission line, and a special pattern generation error insertion means for generating a signal of a specific pattern including a bit error, and a signal of the specific pattern. And a data signal transmitted through the transmission line, and selects one of the input signals according to a supervisory control signal designating an operation confirmation test of the error counting circuit and sends it to the error counting circuit. An error counting circuit monitoring device, comprising: selecting means for controlling the error counting circuit; and inhibiting means for suppressing transmission of an error detection output of the error counting circuit to a device monitoring system according to the monitoring control signal.