JPH011351A - line tracing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial use! 1TP) The present invention relates to an apparatus for analyzing protocol failures in data flowing on a communication line, and in particular, it is capable of automatically collecting data before and after a protocol failure part. Line to do!・Regarding lace equipment.

(Prior Art) 6Y=Since then, this type of line tracing device has been one of the following three types.

(1) If there is no storage area for protocol data flowing on a line, each time transmitted/received data is detected, it is output to a medium outside the device such as a printer.

(2) If a certain amount of storage area is provided, each time transmission/reception data is detected, it is stored in this storage area, and when the area is full of collected data, the oldest collected data is overwritten.

(3) If a medium with a large storage area is provided, each time transmitted/received data is detected, it is stored in this storage area, and data collection is stopped when the area is full of collected data. Or, start overwriting the oldest part of the collected data.

(Problems to be Solved by the Invention) Conventional line tracing devices have the following problems depending on the three types described above.

In the type (1) line tracing device, when the communication speed on the line is high or the amount of information flowing is large, there is a high risk that the collected data may not be output in time and the collected data will be lost.

Type (2) line tracing devices require human supervision in order to stop the tracing operation before the information in the storage area is overwritten when a protocol failure occurs. Therefore, if the frequency of occurrence of failures is low, monitoring may take a long time.

Furthermore, if the occurrence of a failure cannot be discovered at the time of data transmission and reception, even if a human attempts to monitor it, it will not be possible to monitor it, and it will not be possible to prevent overwriting of collected data.

Type (3) line tracing device is a large-capacity #! It requires a memory or disk device to provide i-product area, and is expensive.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the line tracing device provided by the present invention detects a protocol failure in transmitted and received data flowing on a communication line, and when this detection occurs, traces. a protocol failure detection circuit that generates an information accumulation instruction signal; a delay circuit that delays the trace information accumulation instruction signal by a predetermined time and outputs the signal; and a delay circuit that endlessly stores a certain amount of the latest transmitted and received data among the transmitted and received data. , a trace information temporary storage buffer that reads and outputs the stored transmitted and received data when receiving the trace information storage instruction signal from the delay circuit; and the transmitted and received data outputted from the trace information temporary storage buffer. and a trace information storage device for storing.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a line tracing device according to an embodiment of the present invention.

This device includes a protocol failure detection circuit 1, a trace information temporary storage buffer 2, a trace information storage device 3, a delay circuit 4, an upstream data lead-in line 5, a downstream data lead-in line 6, a trace information accumulation instruction line 7°8, and a trace information It is composed of an accumulated data line 9 and an accumulated trace information read line 10.

Protocol data that enters the apparatus through the upstream data lead-in line 5 or the downlink data lead-in line 6 is stored in the trace information temporary storage buffer 2 and simultaneously output to the protocol failure detection circuit 1.

[Protocol failure detection circuit]
Checks whether the data protocol is working according to the rules. The trace information temporary storage buffer 2 stores a certain amount of protocol data that enters the device through the upstream data lead-in line 5 or the downlink data lead-in line 6, and when it becomes full, it sequentially deletes the oldest data, thereby storing the latest constant data. We have accumulated a large amount of data.

When the protocol failure detection circuit 1 detects a protocol failure on the line, it outputs a trace information accumulation instruction signal to the trace information accumulation instruction line 7. The trace information accumulation instruction signal outputted to the trace/111 information accumulation instruction line 7 is delayed by a predetermined time in the delay circuit 4 and sent to the trace information accumulation instruction line 8. When the trace information storage instruction signal 1 is sent to the trace information storage instruction line 8, the data stored in the trace information temporary storage buffer 2 is transferred to the trace information storage device 3 via the trace information storage data line 9. Stored.

In order to store data after a protocol failure occurs, the delay circuit 4 adds a predetermined time delay to the signal on the trace information storage instruction line 7 and supplies the signal to the trace information storage instruction line 8.

As described above, only data before and after the occurrence of a protocol failure is efficiently collected in the trace information storage device 3.

A person only needs to read out the data stored in the trace/m-information storage 2 and 3 later through the stored trace information readout line 10.

(Effects of the Invention) As described above, the present invention allows the trace information storage device to efficiently collect only data before and after a protocol failure occurs.

Therefore, even if a human cannot recognize the moment when a protocol failure occurs, it is possible to grasp the situation before and after the occurrence of a protocol failure by using data read later from the trace information storage device.

Furthermore, the present invention has the effect of saving the storage area for global data.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a line tracing device according to an embodiment of the present invention. ■...Protocol failure detection circuit, 2...Trace information temporary storage buffer, 3...Trace information storage device,
・1...Mannobu circuit, 5...up data lead-in line, 6
. . . Down data lead-in line, 7, 8 . . . Trace information accumulation instruction line, 9 . . . Trace = HV information accumulation data line,
10... Accumulated trace information read line.

Claims (1)

[Claims] A protocol failure detection circuit that detects a protocol failure in transmitted and received data flowing on a communication line and generates a trace information accumulation instruction signal when this detection occurs; a delay circuit that delays and outputs the transmitted/received data; and a certain amount of the latest transmitted/received data of the transmitted/received data is stored endlessly, and the transmitted/received data is stored when the trace information storage instruction signal is received from the delay circuit. A line tracing device comprising: a trace information temporary storage buffer that reads and outputs the trace information temporary storage buffer; and a trace information storage device that stores the transmitted and received data output from the trace information temporary storage buffer.