JPH0514451A - Line monitor method - Google Patents

Abstract

PURPOSE:To reduce the quantity of additional function and additional hardware by incorporating a line monitor function to a data communication system and utilizing a display function for the line monitor data through the use of a man- machine interface function provided in the data communication system. CONSTITUTION:Branch circuits 121, 122 for an input output signal are provided on a line input output section in a data communication system and the transmission reception data inputted/outputted to/from the branch circuits 121, 122 is stored to a trace memory 24 according to a command of an internal CPU 31. When the display of the content of the trace memory 24 from a man-machine interface circuit 35 to the CPU 31 is commanded, the CPU 31 transfers the content from the trace memory 24 to the man-machine interface circuit 35 via an internal bus 71, a bus coupling circuit 34 and a host bus 72. The trace data being transferred transmission and reception data is displayed onto a trace result display circuit 36 from the man-machine interface circuit 35 via a signal line 73.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line circuit monitoring method, and more particularly to a full-duplex line protocol monitoring method.

[0002]

2. Description of the Related Art In a conventional line monitoring method, as shown in FIG. 3, transmission lines 91 and 92 connected between data communication systems A and B are drawn into a line monitoring device 83 and branched inside the line monitor 83. The communication data on the line is monitored, internally stored and analyzed.

Another method is to provide a line monitor terminal to the line control device. In other words, the transmission monitor signal line 61 branched from the branch circuits 121 and 122 provided in the line output terminal 111 and the line input terminal 112, respectively, so that the device according to the present invention in FIG.
1 and line monitor terminals 211 and 212 connected to the reception monitor signal line 612, and line monitor terminals 211 and 212 are provided.
The transmission data and the reception data are output from the 212 to the outside. A line monitor device is externally connected to the line monitor terminals 211 and 212 to monitor the transmission data and the reception data.

[0004]

When connecting the line monitor device 83 on the transmission line as shown in FIG. 3, first, the physical conditions on the transmission line and the connection parts of the line monitor device must all match. .. Further, even if the physical condition is satisfied, a part of the signal link control (layer 2) function needs to be provided inside the line monitor. However, there are various types of transmission paths, and it is often difficult to connect the line monitoring device. In particular, in a high-speed transmission line, an optical transmission line, a transmission line for transferring encoded data, and a transmission line having a dedicated protocol, it is difficult to connect the line monitor device and there is a problem that it is not versatile. On the other hand, even if the line control device shown in FIG. 1 is provided with the line monitor terminals 211 and 212, a standard interface can be made to some extent, but as in the case of FIG. 3, a general-purpose line monitor device is not necessarily used. There is a problem that it is not always possible.

[0005]

SUMMARY OF THE INVENTION The present invention provides a data communication system having a line control device for performing alternate communication with an external data communication device via a transmission line and a man-machine interface device for inputting / outputting to / from the entire system. In the line monitoring method, the transmission data on the output line and the reception data on the input line of the line control device are collected at the input / output part of the line independently of the data transmission / reception control circuit for online operation, and the collected transmission / reception data Is stored inside the data communication system, and the stored transmission / reception data is displayed according to an instruction from the man-machine data interface device.

[0006]

According to the present invention, a line monitor function is built in a data communication system to collect and store transmission / reception data,
The line monitor data display function is performed using the man-machine interface function of the data communication system.

[0007]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a line control device having a line monitor function, showing an embodiment of a line monitor method according to the present invention. In the figure, the line output terminal 111 and the line input terminal 112 are connected to an output signal branch circuit 121 and an input signal branch circuit 122, respectively.
22 are signal lines 531 and 532 and a signal line 611,
The layer termination circuit 13 and the primary buffer 22 via 612.
1, 222 are connected. The layer 1 termination circuit 13 is connected to the layer termination circuit 14 by signal lines 541 and 542.

The primary buffers 221 and 222 are connected to the trace memory control circuit 23, the trace memory control circuit 23 is connected from the trace condition designating circuit 25 by a control signal 64, and data write control 63 to the trace memory 24 is performed. .. Layer 2 termination circuit 14, trace memory 24, trace condition designating circuit 25, CPU 3
1, the ROM 32, the RAM 33, and the bus coupling circuit 34 are commonly connected by the internal bus 71. The bus coupling circuit 34 is further connected to a man-machine interface circuit 35 via a higher-order bus 72, and a trace result display circuit 36 is connected to the man-machine interface circuit 35 via a signal line 73.

Next, the operation of the apparatus shown in FIG. 1 will be described. The transmission data output from the layer 1 termination circuit 13 is branched by the output branch circuit 121 and sent to the line output terminal 111 and the output data primary buffer 221. Similarly, the received data from the line input terminal 112 is the input signal branch circuit 12
2 and is branched by the layer 1 termination circuit 13 and the input signal 1
It is sent to the next buffer 222. Primary buffers 221 and 2
The transmission data and the reception data input to 22 are stored in the trace memory 24 via the trace memory control circuit 23 according to the designation from the trace condition designating circuit 25.
The designation of the trace condition is programmably written in the trace condition designation circuit 25 by the CPU 31 to designate the operation of the trace memory control circuit 23.

FIG. 2 shows an example of data written to the trace memory 24. In the case where the sending data and the receiving data are repeatedly written in the trace memory 24 in real time, the sending / receiving identification flag S / R is attached as shown in FIG. 2, and the sending data and the receiving data are set in the primary buffers 221 and 222. In this order, the trace memory control circuit 23 takes out the data and writes it in the trace memory 24.

When the man-machine interface circuit 35 instructs the CPU 31 to display the contents of the trace memory 24 via the upper bus 72 and the bus coupling circuit 34, C
The PU 31 is transferred from the trace memory 24 to the man-machine interface circuit 35 via the internal bus 71, the bus coupling circuit 34, and the upper bus 72. The transferred trace data of the transmitted data and the received data is displayed on the trace result display circuit 36 from the man-machine interface circuit 35 via the signal line 73.

[0012]

As described above, according to the present invention, the line monitor function is built into the data communication system, and there is no need for the line monitor on the transmission line and the line monitor is performed regardless of the special condition of the transmission line or the dedicated protocol. It can be performed. Further, since the man-machine interface function of the data communication system is used for the line monitor data display function and the input / output function, there is an effect that the amount of additional functions and additional hardware for line monitoring can be reduced.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a line control device showing an embodiment of a line monitoring method according to the present invention.

FIG. 2 is an allocation diagram of a trace memory.

FIG. 3 is an explanatory diagram showing a conventional method.

[Explanation of symbols]

 111, 112 Line output terminals 121, 122 Branch circuit 221, 222 Primary buffer 23 Trace memory control circuit 24 Trace memory 25 Trace condition designation circuit 31 CPU 35 Man-machine interface circuit 36 Trace result display circuit

Claims (1)

Claim: What is claimed is: 1. A line monitor of a data communication system, comprising a line control device for performing alternate communication with an external data communication device via a transmission line, and a man-machine interface device for inputting / outputting to / from the entire system. In the method, the transmission data on the output line and the reception data on the input line of the line control device are collected at the input / output part of the line independently of the data transmission / reception control circuit for online operation, and the collected transmission / reception data is collected. A line monitoring method, characterized in that the transmission / reception data stored in a communication system is displayed according to an instruction from a man-machine data interface device.