JPH10224351A - Network management aid device, network management method, and storage medium storing program used for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the network management aid system aids the user to grasp a configuration state of a network being a management object. SOLUTION: An information acquisition device 1200 references a text arriving at a connecting point 2a to acquire information of the text including a transmission distance of the text from a terminal equipment that transmits the text and an information processing unit 2200 obtains relative position relations of each terminal equipment on a transmission line. A configuration diagram where terminal symbols symbolizing terminal equipments respectively are arranged while the position of each terminal equipment is reflected is generated based on the obtained relative position relations and path information of the transmission line 1 stored in advance in an information storage device 2100 and displayed on a display device 2300.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a network management support apparatus and a management method for managing a state of a network, and a storage medium storing a program used for the network management support apparatus. The present invention relates to a network management support device and a management method suitable for doing so, and a storage medium storing a program used for the same.

[0002]

2. Description of the Related Art In the management of a network, control of the network configuration state, such as addition, relocation, removal, address management, and physical configuration of the terminal, is performed. It is necessary to monitor for compliance with the standard.

However, in the current network,
The user can easily change the configuration of adding, relocating, removing, or changing the address of a terminal. Therefore, the configuration status of the network is often changed according to the user's intention. Therefore, it is difficult to keep track of the latest network configuration status and manage it.

Under such circumstances, in the conventional network management, when a failure occurs in the network, monitoring of an illegal message (packet) flowing through the network is performed while isolating the network, thereby causing the failure. The identified terminal is identified, and measures such as recovering or eliminating the identified terminal are taken.

[0005]

As described above, the configuration is changed by the user, and the configuration of the network is often changed. However, the user who made the configuration change
The change may not be notified to the network administrator or other users. In addition, even if the change is notified, the history of the change is often not recorded.

For this reason, it is difficult for the network administrator and each user to grasp the latest configuration status of the network. In particular, in many cases, it is not possible to obtain data that can grasp the entirety of the route information indicating the route on which the network transmission line is laid and the connection position information indicating the location where each terminal is installed.

[0007] Therefore, since the configuration status of the network and the route information cannot be grasped, a complicated operation such as checking each individual terminal is required in order to identify the terminal that has caused a failure in the network. In addition, when isolating a failure, a network service may be stopped.

Further, it is difficult to grasp route information and connection position information in a building in which a network is laid. For this reason, it is often difficult to identify a terminal that requires maintenance work.

It is a first object of the present invention to provide a network support apparatus capable of displaying a network configuration diagram in which the route information and the connection position information are reflected.

[0010] It is a second object of the present invention to provide a network management support device capable of displaying information of a terminal that has caused a network failure in such a manner that the terminal can be easily identified.

[0011]

According to a first aspect of the present invention, a plurality of terminals are connected to a transmission line, and information is transmitted between the connected terminals according to a first aspect of the present invention. In a network management support device for supporting the management of a network used for performing, an information acquisition device connected to a transmission path of the network and for acquiring information of a message transmitted on the transmission path, A display device for displaying, with reference to the information of the message, a terminal creates a network configuration diagram reflecting a physical position arranged on the transmission path, and the created network configuration diagram is displayed on the display device. An information processing device for displaying the information, wherein the information acquisition device observes a signal waveform of the message, and transmits a transmission distance on the transmission path to a terminal that transmitted the message. It gets the broadcast, the information processing apparatus,
Based on the transmission distance information acquired by the information acquisition device, the position on the transmission path of the connection point to which each terminal that sent the message is connected is obtained, and the transmission path symbol indicating the transmission path of the network is Displayed, and a symbol for symbolizing the terminal, on the transmission path symbol, to create a network configuration diagram arranged reflecting the physical position where each terminal is arranged on the transmission path, the above created A network management support device is provided, wherein a network configuration diagram is displayed on the display device.

According to a second aspect of the present invention, in a network management support apparatus for supporting management of a network used for transmitting information between a plurality of connected terminals, an image display apparatus for displaying an image is provided. A display device, an information acquisition device connected to a transmission path of the network and for acquiring information of a message transmitted through the transmission path, and path information indicating a path on which the transmission path is laid are stored in advance. Information storage device, the information of the message, and, with reference to the route information, to create a network configuration diagram reflecting the physical location where the terminal is located, the created network configuration diagram to the display device Information processing device for displaying, the information acquisition device observes the signal waveform of the telegram, on the transmission path to the terminal that sent the telegram The information processing apparatus obtains transmission distance information, obtains coordinates on the transmission path of a connection point of each terminal that has transmitted the message based on the transmission distance information obtained by the information obtaining apparatus, A network configuration diagram in which symbols for symbolizing the terminals connected to the network are arranged reflecting the connection position of each terminal in the installation area where the network is installed, and the created network configuration diagram is displayed on the display device. Is provided.

According to a third aspect of the present invention, there is provided a network management method for supporting management of a network used for transmitting information between a plurality of connected terminals, wherein the transmission is performed on a transmission path of the network. Observing the signal waveform of the transmitted message, obtaining the transmission distance on the transmission path to the terminal that transmitted the message, based on the determined transmission distance, the connection point of each terminal that transmitted the message was determined. Finding the coordinates on the transmission path, referring to the prepared path information indicating the path on which the transmission path is laid, a symbol for symbolizing each of the plurality of terminals is placed in the laying area where the transmission path is laid. Creating a network configuration diagram that is arranged so as to reflect the connection position of the terminal in (a), and displaying the created network configuration diagram. Network management method is provided.

According to a fourth aspect of the present invention, there is provided a storage medium on which a program is recorded in a machine-readable manner, wherein a signal waveform of a message transmitted on a transmission line of the network is observed, and the message is transmitted. The transmission distance on the transmission path to the terminal that has been determined is obtained, the coordinates on the transmission path of the connection point of each terminal that has transmitted the message are obtained based on the obtained transmission distance, and the path on which the transmission path is laid. A network configuration in which the symbols for symbolizing the plurality of terminals are arranged by reflecting the connection positions of the terminals in the installation area where the transmission lines are installed, with reference to the prepared route information indicating A storage medium storing a program for causing the computer to execute drawing of a diagram and displaying the created network configuration diagram is provided.

According to a fifth aspect of the present invention, a plurality of terminals are connected to a transmission path, and a network management support for supporting management of a network used for transmitting information between the connected terminals. The apparatus has a configuration diagram display means for displaying a configuration diagram of a network, which indicates a route of a transmission line and an arrangement position of a terminal connected to the transmission line in a laying area where the network is laid. A network management support device is provided.

In order to achieve the second object, according to a sixth aspect of the present invention, in the first aspect of the present invention, the information acquisition device observes a signal waveform of the message. Obtaining the transmission distance and acquiring message compatibility information indicating whether or not the message conforms to the specifications defined in the network, and the information processing device obtains the symbol by the information acquisition device. There is provided a network management support device characterized by creating a network configuration diagram to be displayed as different display modes according to the difference in the message compatibility information.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A network to which a network management support device 10 according to the present invention is applied will be described with reference to FIG.

FIG. 1 shows a network in which terminals 3 to 5 are connected to transmission line 1 and transmit and receive messages for communication. In FIG. 1, a terminal 5 is connected to a connection point 2b via a transceiver 9, and a terminal 3, 4 is connected to a transmission line 1 for transmitting and communicating a message whose specifications are defined in advance.
Is connected to the connection point 2c of the transmission path 1 by the multiport transceiver 8
Connected via

When the network is configured as a bus as shown in FIG. 1, both ends are terminated by terminators 7a and 7b.

Referring to FIG. 2, a first embodiment of the present invention will be described. The network management support device 10 according to the present embodiment includes an information acquisition device 1200 connected to the transmission path 1 for acquiring information of a message transmitted on the transmission path 1, and a path on which the transmission path is laid. And a network management support system 2000 for processing the information of the message and the information of the route to perform display for supporting network management. You.

The information of the message to be acquired by the information acquisition device 1200 includes terminal identification information indicating the terminal that transmitted the message, and message status information indicating the state of the message.

As the terminal identification information, logical identification information or physical identification information can be used.

The logical identification information is information logically defined in a code string of a message sent to the network. For example, an address predefined for each terminal can be used. In order to obtain the address defined for the terminal, for example, referring to the network specification,
The address contained in the message may be read. More specifically, it is possible to capture a signal waveform of a telegram and cut out data with reference to the logical specifications of the network. The circuit for such a purpose can be configured using, for example, an IC having a built-in network logic circuit that is commercially available.

The physical identification information is information based on the physical properties of a telegram as an electric signal. For example, the position of a connection point at which each terminal is connected to the network can be used. More specifically, a distance from a predetermined reference point on the transmission line 1 is obtained, and the terminal can be specified based on the distance. The transmission distance of such a message is determined, for example, by measuring the time at which the message arrives at at least two points on the transmission path 1 and comparing the measured times with each other to determine the time required for the message to be transmitted. , And can be obtained by referring to the transmission speed of a message on the transmission path. Further, at one point on the transmission line, a signal waveform of a message arriving at the point is observed, the intensities of two different frequency components are measured, and a transmission distance is obtained by obtaining a ratio of these intensities. Can also.

When the terminals are specified by the transmission distance, when a plurality of terminals are connected to the same connection point 2c as in the terminal 3 and the terminal 4 in FIG. Are not distinguished. However, as described below,
The same terminal group 6 can be recognized.

As the message information, logical message information or physical message information can be used.

The logical message information is information logically defined in a code string of the message transmitted to the network. For example, a source address indicating a terminal that has transmitted a message, a destination address of a terminal that is a destination of the message, a protocol that defines a code string of the message, or the like can be used. Such logical message information can be obtained, for example, in the same manner as the logical identification information described above.

The physical message information is information based on the physical properties of the message as an electric signal. For example, a message length, an interval between messages, a network utilization rate, a collision rate indicating a rate at which collisions between messages occur, and the like can be used. In order to acquire such physical message information, for example, an information acquisition device 1200 (see FIG. 26) having a physical information acquisition unit 1210 described below can be used.

The information storage device 2100 has a transmission line 1
Is stored in advance, which indicates the laying route of the transmission path in the laying area where the is laid. The route information can be described by, for example, the coordinates of each point of the transmission line in the installation area. That is, as shown in FIG. 29, when the transmission path laid in the laying area A is represented as a path S, each point P ₀ , P ₁ , P ₂ , P ₃ ,. P _E
The path S can be described by the information indicating the coordinates of each point. Information indicating such coordinates is, for example, as shown in FIG.
0 can be stored in the information storage device 2100. In FIG. 30, for each point on the route S, a format is formed in which information indicating the name and coordinates is associated with an identification number for identifying information of each coordinate. By storing the information in the format with the identification number, it is possible to efficiently access information indicating each coordinate. When the points on S are defined in order as shown in FIG. 29, the name of the point may be used instead of the identification number.

In FIG. 2, the network management support system 2000 includes a display device 2 for displaying an image.
Based on the information acquired by the information acquisition device 1200 and the information stored in the information storage device 2100, an image for supporting network management is created, and the created image is displayed on the display device. 2300
And an information processing device 2200 for displaying the information.

The information processing device 2200 includes an arithmetic unit 2210 for executing information processing, a program for describing the procedure of information processing, a storage device 2220 for storing a result of information processing, and an input / output device. And an interface 2230 for performing the operation.

The arithmetic unit 2210 detects the connection state of the terminal connected to the network by referring to the information acquired by the information acquisition unit 1200 and the information stored in the information storage unit 2100. Information processing for displaying an image for allowing the network administrator to grasp the detected connection state on the display device 2300 is performed. The arithmetic device 2210 realizes the above-described information processing function by operating according to a program in which a processing procedure is described.

The interface 2230 is provided with a signal from the information acquisition device 1200 and the information storage device 2
The display device 2300 receives the data 100 and converts it into a form that can be processed by the arithmetic device 2210, and converts the result of information processing by the arithmetic device 2210 into a signal that the display device 2300 can receive.

Further, by providing the information processing device 2200 with an input device 2400 for receiving a command from the outside, the operator can receive an operation of selecting information. In addition, it is possible to receive a request to add another process to the selected information and display the result on the display device 2300.

As the input device 2400, a keyboard device 2410, or a pointing device 2420 in addition to or instead of the keyboard device 2410 can be used. The pointing device 2420 is connected to the display device 2300.
There is a direct pointing device that directly performs an operation on the screen, and an indirect pointing device that performs a pointing operation indirectly by operating at a position away from the screen.
As a direct pointing device, for example, a light pen,
Touch screens, styluses and the like can be mentioned. Also,
Examples of the indirect pointing device include a mouse, a trackball, a joystick, a tablet, a touch pad, and the like. By using a pointing device, an instruction to display a candidate of a target to input information,
In addition, an instruction for selecting one of the displayed candidates can be received as a simple operation. For example, an instruction to select a symbol symbolizing a target terminal from among a plurality of symbols prepared to symbolize the terminal and displayed on a screen is given, and information about the symbol, for example, an address and a connection An operation for inputting and changing the form, etc., can be easily performed.

Note that a voice input device may be used in order to efficiently input a lot of information such as a terminal address.

The program describing the procedure for the arithmetic unit 2210 to realize the above-described functions is, for example,
The data is stored and supplied to the storage medium 2260, read by the storage medium reading device 2250, and stored in the storage device 2220. The program stored in the storage device 2220 is read into the arithmetic device 2210 when executing information processing. The function of supporting the network management described above is realized by the arithmetic device 2210 executing the processing according to the procedure described in the program read into the storage device 2220. Note that the program may be read in a form in which the program stored in the storage medium 2260 is directly read from the storage medium reading device 2250 into the arithmetic device 2210. Storage medium 226
As 0, for example, a portable storage medium can be used. Specific examples of portable storage media include, for example,
Examples include a flexible magnetic disk, a removable hard disk, a magneto-optical disk, and an optical disk. Further, a detachable semiconductor memory can be used. Specifically, a memory card or a PC card can be used as the detachable semiconductor memory.

As the display device 2300, a device for displaying an image and presenting information to an operator, for example, a video display device can be used. In addition, you may use a speech generator together. For example, information requesting an input, information confirming that the input has been accepted, information notifying a warning, and the like can be transmitted by generating a voice from the voice generating device.

Next, the information acquisition device 1200 will be described in detail with reference to FIG. Information acquisition device 12
Reference numeral 00 denotes a physical information acquisition unit 1210 for acquiring physical information of a signal waveform of a message transmitted on a transmission line, and a logical information of the message with reference to a specification defined in a network. And a logical information acquisition unit 1220. Here, the physical information acquisition unit 1210
And an information acquisition device 1200 that includes both a logical information acquisition unit 1220 and a logical information acquisition unit 1220. However, in order to detect the above-described connection state, at least one of the information acquisition devices 1200 may be provided as long as it can acquire information that can identify a terminal. .

The physical information acquisition unit 1210 includes a distance calculation unit 1300, a message length measurement unit 1500, and a message interval measurement unit 1
700 and a message collision abnormality detection unit 1900 in parallel.

The distance calculation unit 1300 is connected to the transmission line 1
The length of the path transmitted through the transmission line 1 is measured until the message transmitted from the terminal connected to the transmission line reaches the connection point. The message length measuring unit 1500 measures the message length of each message transmitted on the transmission path 1. The message interval measuring unit 1700 measures an interval between messages for a plurality of messages transmitted on the transmission path 1. The message collision abnormality detection unit 1900 measures the utilization of the transmission line 1 when a collision between the messages occurs, and determines that the utilization of the transmission line 1 at that time is smaller than a predetermined value. ,
It is detected that an abnormal message collision has occurred.

Next, in the physical information acquisition unit 1210,
The principle of measuring the path length will be described.

In general, the amount of attenuation in a transmission line monotonically increases as the frequency increases. Therefore, by observing the waveform arriving after being transmitted through the transmission path in the frequency domain and comparing the intensities in a plurality of frequency segments, it is possible to compare the magnitude of the transmission distance from the device that transmitted the signal. This magnitude relationship is, of course, specified even if the actual attenuation rate in the transmission path is not given, and is specified even if the characteristics of the transmission line change in each section of the transmission path. By providing the attenuation rate over the entire length of the transmission path, the transmission distance itself can be specified.

On the other hand, regarding a signal transmitted and received on the transmission path, "X5252-1990" specified in Japanese Industrial Standards
In "8.3.1.3 Coaxial cable signal level" of "Local network CSMA / CD access method and physical layer specification" (hereinafter referred to as network specification),
"The rise time defined by 10-90% of the signal is 1
Must be 25 ns ± 5 ns at 0 Mbit / s. The difference between the rise time and the fall time is 1
ns. Is determined. A transceiver, which is an interface connecting each terminal to the transmission path, is required to transmit and receive signals according to this specification. A typical voltage value from each terminal is estimated to be 2.05 V on the transmission line from the recommended drive current. Each terminal is defined to transmit and receive electric signals according to this standard. On the other hand, regarding the attenuation in the coaxial cable used for the transmission line, in 8.4.1.2 attenuation, “the attenuation of a 500 m long coaxial cable is 10%.
8.5 dB (17 dB / k) measured with a sine wave of MHz.
m) and less than 6 dB measured with a 5 MHz sine wave
(12 dB / km) or less. Is determined.

In the above network specification,
When transmitting a message, each terminal transmits a 62-bit pulse train called a preamble in FIG.
It is specified that 31 MHz waveforms should be added before a telegram.

Thus, by measuring the intensity ratio of two different frequency components of the preamble portion of the signal waveform transmitted on the transmission line 1 of the network, information corresponding to the transmission distance from the transmission source is obtained. Can be obtained. Specifically, for the received signal waveform, a sine wave component having a frequency of 5 MHz, which is a fundamental wave included in the preamble portion, and a sine wave component having a frequency three times as high as 15 MHz
Finding the intensity ratio between the sine wave component of Hz and the sine wave component.

Hereinafter, the function of each block constituting the physical information acquisition unit 1210 will be described in detail.

First, referring to FIGS. 3 and 4, distance calculation unit 13 of physical information acquisition unit 1210 to which the present invention is applied.
00 will be described. FIG. 3 is a block diagram of the distance calculation unit 1300. FIG. 4 is a waveform chart showing an example of an output waveform at each point in FIG.

The distance calculation section 1300 takes in a signal waveform transmitted on the transmission line 1 and obtains an intensity ratio of the signal waveform in two different frequency regions. Then, with reference to the frequency characteristic of the attenuation amount in the transmission line 1 given in advance, based on the obtained intensity ratio, information corresponding to the transmission distance to the terminal that transmitted the captured signal waveform is obtained.

In FIG. 3, a distance calculation unit 1300 includes a buffer circuit 1320 for distributing a signal and a 5 MHz signal.
A band pass filter 1330, a 15 MHz band pass filter 1340, and two averaging circuits 13 for averaging the signals from the two band pass filters, respectively.
50, 1360, a division circuit 1370 for calculating the ratio of the signals from the two averaging circuits, a level distance conversion circuit 1380 for converting the obtained ratio value into a distance, and the converted distance can be displayed. And a display circuit 1390 for outputting as important information.

The buffer circuit 1320 takes in the signal waveform transmitted on the transmission line 1 with high impedance, and outputs it to the circuit connected to the subsequent stage with low impedance. As a result, it is possible to take in the waveform on the transmission line 1 without affecting it, and to distribute the same waveform between the respective circuit blocks branched to the subsequent stage. The signals distributed to the two systems by the buffer circuit 1320 are output with their polarities inverted as shown in FIG. 4B.

A signal waveform of one system is filtered by a bandpass filter 1330 having a center frequency of 5 MHz, and becomes a waveform shown in FIG. Next, the averaging circuit 1
By means of 350, averaging is performed as shown in FIG.

The signal waveform distributed to the other system is filtered by a bandpass filter 1340 having a center frequency of 15 MHz, and becomes a waveform shown in FIG. Thereafter, similar to the above-mentioned 5 MHz waveform, the averaging circuit 1
By 360, averaging is performed as shown in FIG.

Averaging circuit 1350 and averaging circuit 13
At 60, a ratio of signal intensities is determined in a divider circuit 1370 for each averaged waveform. The value of the signal strength ratio obtained by the division circuit 1370 corresponds to the magnitude of the distance from the terminal that transmitted the signal waveform to the transmission line 1 to the network management support device 10.

Next, the attenuation characteristic of the transmission line 1 in the two different frequency ranges is converted into a distance by a predetermined intensity ratio-distance conversion circuit 1380. The output circuit 1390 generates a signal for outputting the converted distance value to the information processing device 2200.

The distance calculation unit 1300 performs the above operation every time a message from the terminal arrives, so that the distance to the terminal is calculated.

Next, the message length measuring unit 1500 of the physical information acquiring unit 1210 will be described with reference to FIGS.

FIG. 5 is a circuit block diagram of the message length measuring unit 1500, and FIG. 6 is a waveform diagram showing a waveform example in each circuit block shown in FIG.

FIG. 6A shows a message transmitted from each terminal. Although FIG. 4 shows a short time axis showing individual pulses, this figure shows a long time axis showing a pulse train of a telegram.

In FIG. 5, message length measuring section 1500 includes
A buffer circuit 1520 for extracting a signal and a low-pass filter circuit 15 for averaging the extracted signal
30 and a message length measuring circuit 1 for measuring the message length
600, a reference value circuit 1570 for generating a reference value of a signal corresponding to a predetermined message length, and a message length from the message length measuring circuit 1600 are compared with a reference value from the reference value circuit 1570. And a display circuit 1580 for outputting the comparison result as a displayable signal.

The buffer circuit 1520 extracts the signal waveform converted into the inverted waveform as shown in FIG. 6B. Next, the low-pass filter circuit 153 in FIG.
0 converts this waveform into a telegram presence / absence signal indicating the presence / absence of a telegram. Here, by setting the cut-off frequency of the low-pass filter circuit 1530 to about 330 kHz, it can be easily converted to a message presence / absence signal. FIG. 6C shows the waveform of the message presence / absence signal.

The converted message presence / absence signal is input to a message length measuring circuit 1600 for measuring the length of the message. The message length measuring circuit 1600 measures the message length by measuring the time from the rise to the fall of the message presence / absence signal. That is, in the message length measuring circuit 1600,
A rising / falling detection circuit 1590 detects a rising edge and a falling edge of the message presence / absence signal. Oscillator 1550 to measure time
Sends out a clock pulse as shown in FIG. When the rising edge of the message presence / absence signal is detected, the counter circuit 1560 starts counting the pulses transmitted from the oscillation circuit 1550 by the counter circuit 1540. Also, a rise / fall detection circuit 1
When the counter 590 detects the falling edge of the waveform of the message presence / absence signal, the started counter circuit 1540
Stop the counting of the pulses by.

FIG. 6 (e) schematically shows how this counting is performed. In FIG. 6, (e) is shown by a straight line, and the result of the counting is drawn to increase continuously. However, the integrated value of the actual counting becomes flat in the space area of the clock pulse, and Increase. 6A, the count value of the pulse increases as the message continues. For example, 1532 pulses are counted before counting is stopped. In addition, the count of the subsequent pulse is terminated according to the length of the message length. For example, the count value when the counting is stopped is 78. Then, when the counting is stopped, the count value is transmitted. Then, the counter circuit 1540 clears the count number for the next measurement.

The length of the message measured by the message length measuring circuit 1600 is compared in magnitude by a comparison circuit 1560 with a predetermined reference value generated by a reference value generation circuit 1570. Specifically, the reference value is set to a length corresponding to a lower limit reference value of 72 bytes and an upper limit reference value of 1526 bytes due to the limitation of the frame size based on the DIX specification. As a result of the comparison by the comparison circuit 1560, the output circuit 1580 outputs a signal for displaying a warning when the message length is longer than the upper reference value and shorter than the lower reference value. For example, FIG.
When the length of the measured telegram corresponds to 1532 bytes with respect to the preceding telegram in
It is determined that the message length is larger than the reference value, and a pulse indicating a warning is output as shown in FIG. When the measured message length of the subsequent message is equivalent to 78 bytes, the comparison circuit 1560 determines that the message length is within the reference value, and as shown in FIG. A pulse indicating that the message is a message is output. In addition, even when the length of the measured telegram is smaller than the above lower limit, such as a length of 60 bytes, a pulse indicating a warning is output as shown in FIG. 6F.

Next, the message interval measuring section 1700 will be described with reference to FIGS.

FIG. 7 is a circuit block diagram of the message interval measuring unit 1700. FIG. 8 is a graph showing an example of a signal waveform in each block shown in FIG. The message interval measuring unit 1700 measures the length of a waveform portion indicating that there is no message, for the message presence / absence signal generated similarly to the message length measuring circuit unit 1500, and obtains the interval between messages.

FIG. 8A shows a message transmitted from each terminal. 8, how to set the time axis is the same as in FIG.

In FIG. 7, a message interval measuring unit 1700
Is a buffer circuit 1720 for extracting a signal, a low-pass filter circuit 1730 for averaging the extracted signal, a message interval measuring circuit 1800 for measuring an interval between messages, and a predetermined message length. A reference value circuit 1770 for generating a reference value for the corresponding signal;
The message length from the message interval measuring circuit 1800 is used as a reference value circuit 1.
Comparison circuit 1 for comparing against a reference value from 770
760 and a display circuit 1780 for outputting the comparison result as a displayable signal.

The buffer circuit 1720 takes in the signal waveform transmitted on the transmission line 1 and converts it into a waveform whose polarity is inverted as shown in FIG. Next, the low-pass filter circuit 1
730 converts this waveform into a telegram presence / absence signal indicating the presence / absence of a telegram. Here, by setting the cutoff frequency of the low-pass filter circuit 1730 to about 330 kHz,
It can be easily converted to a telegram presence / absence signal. FIG. 8C shows the waveform of the message presence / absence signal.

The converted telegram presence / absence signal is input to a telegram interval measuring circuit 1800, and the telegram interval is measured.
That is, in the message interval measurement circuit 1800, the measurement of the message interval is performed by counting the clock pulses (FIG. 8D) generated by the oscillation circuit 1750.
For the input message presence / absence signal, the rising / falling detection circuit 1790 detects a rising edge and a falling edge of the message presence / absence signal. The counter circuit 1740 detects when a falling edge is detected.
The counting of the clock pulse is started, and the counting is stopped when the rising / falling detection circuit 1790 detects the rising edge. The state of this counting is schematically shown in FIG. The count value increases from the start of counting after the completion of the message until the stop of counting upon detection of the next message. This count value corresponds to the counting time. When the counting is stopped, the interval between telegrams is measured from the count number of the counter circuit 1740 and the predetermined pulse transmission interval. Further, for the next measurement, the counter circuit 17 is used.
The count number of 40 is cleared.

The comparison circuit 1760 compares the size of the measured message interval with the predetermined reference value generated by the reference value generation circuit 1770. For example, the reference value of the message interval is set to an inter-frame gap defined in CSMA / CD, that is, 9.6 μs, which is a time interval after confirming that the state of the transmission path 1 is empty and before transmitting. can do. FIG.
As shown in (e), when the counting result stops at the count value corresponding to 9.3 μs, the comparison circuit 1760 compares the message interval with this reference value, and as a result, the interval between the messages becomes It is determined that the value corresponds to the reference value to be warned. Then, a pulse indicating a warning shown in FIG. Output circuit 1780 receiving a pulse indicating a warning
Outputs a signal for displaying a warning.

Next, with reference to FIG. 9 and FIG. 10, the message collision abnormality occurrence detecting section 1900 will be described.

FIG. 9 is a block diagram of a circuit for detecting an abnormal occurrence of a message collision. In the X5252-1990 local network CSMA / CD access method and physical layer specifications, many terminals are connected, and each terminal frequently transmits and receives messages, that is, under a network usage situation with a high utilization rate. However, accidental collisions are allowed. However, if a collision occurs despite the low network utilization rate, it is feared that the connected terminal has an abnormality. For example, a terminal that cannot receive a message transmitted by another terminal due to a failure of a receiving circuit or the like may cause a collision even in a network usage state with a low utilization rate.

Therefore, it is considered that an abnormal state of the network can be monitored by detecting the network utilization rate at the time when the message collision occurs. The message collision abnormality occurrence detection unit 1900 is a circuit for supporting network management based on the above-described monitoring mode.

In FIG. 9, the message collision abnormality detection unit 1
900 is a buffer circuit 1920 for capturing a signal.
A low-pass filter circuit 1930 for measuring the network utilization, a reference value circuit 1945 for generating a signal corresponding to a predetermined reference value of the network utilization, and the low-pass filter circuit 1930 The network utilization is calculated using the reference value circuit 19.
The voltage comparison circuit 1940 for transmitting a signal when the network utilization factor is smaller than the reference value, and comparing the reference value from the low-pass filter circuit 1950 when the signal is transmitted from the voltage comparison circuit. A gate / sample and hold circuit 1960 for sampling the peak voltage of the signal to be transmitted and holding the sampled value;
And a display circuit 1970 for outputting the value held by 60 as a displayable signal.

FIG. 10A shows an example of a message transmitted from each terminal. By the buffer circuit section 1920, the signal waveform transmitted through the transmission path 1 is converted into a waveform whose polarity is inverted as shown in FIG. 10 (b), distributed to two systems, and taken in.

One of the distributed signal waveforms is converted to a telegram presence / absence signal by a low-pass filter circuit 1930. The output of the low-pass filter circuit 1930 is larger when a message and a message collide with each other than when the message and the message do not collide.
That is, a waveform indicating the general shape of the entire message is obtained by extracting the low-frequency components of the signal and averaging the waveform corresponding to each bit constituting the message. In particular,
The cut-off frequency of the low-pass filter circuit 1930 is set to 330
kHz. In particular, when two telegrams collide, the output is approximately twice as large as a normal output when no telegrams collide. This waveform is shown in FIG.
0 (c).

Here, the output is larger than the normal output, and
Based on a reference output smaller than the output when at least two messages collide, the low-pass filter circuit 19
By comparing the output from 30 with the voltage comparison circuit 1940, it is possible to detect a collision between telegrams and telegrams. The reference value of the voltage comparison circuit 1940 is set by the reference value generation circuit 1945. The reference voltage generated by the reference value generation circuit 1945 can be set to a voltage value intermediate between the voltage when one message arrives and the voltage when two messages collide. More specifically, for example, a voltage that is 1.3 times the output voltage of one normal message can be set as the reference output. By comparing the voltage set as the reference output with the voltage, it is possible to distinguish between the normal state and the collision state. The voltage comparison circuit 1940 outputs a signal that is in a high state only when a telegram collides with the telegram. This signal is shown in FIG.

The other system signal of the above-mentioned distribution is input to the low-pass filter circuit 1950.
Here, the duty ratio of the pulse train transmitted on the transmission path is
It can be known from the ratio of the peak height of the peak voltage of the original pulse waveform to the peak height of the integrated waveform. Therefore, by setting the time constant of the low-pass filter circuit 1950 to the time range of the utilization rate to be detected, the network utilization rate in the time range can be obtained. Specifically, as shown in FIG. 10E, by setting the time to 3 seconds, the network usage rate can be monitored in a time range including a sufficient number of messages.

The gate / sample and hold circuit 1960 uses the signal indicating the message collision from the voltage comparison circuit 1940 as a gate, and sets the utilization rate at the timing shown in FIG. Take out the level shown in e). That is, the voltage value of the peak shown in FIG. 10F is sampled, and the voltage value of the peak is held and output for a certain period of time. By monitoring this voltage value, an abnormal state of a message collision can be monitored.

Referring to FIG. 11, physical information acquisition section 121
Another aspect of 0 will be described. The physical information acquisition unit 1210 in this mode realizes each function by a block configuration sharing a circuit that outputs a common signal. In the block configuration of the present embodiment, the function of obtaining the length of a message, the interval between messages, and the utilization rate is realized by a low-pass filter circuit without using an oscillation circuit and a counter circuit.

In this embodiment, buffer circuit 1320 of distance calculating section 1300 shown in FIG. 3, buffer circuit 1520 of message length measuring section 1500 shown in FIG. 5, and buffer circuit 1720 of message interval measuring section 1700 shown in FIG. And the buffer circuit 1 of the message collision abnormality detection unit 1900 shown in FIG.
And 920 as a common buffer circuit 1020. The buffer circuit 1020 converts a signal fetched from the transmission line 1 into an input side of the distance calculation unit 1300.
5 MHz bandpass filter circuit 1330 and 15 MHz
The signal is distributed to a z band pass filter circuit 1340, a 330 kHz low pass filter circuit 1030, and a 3 sec low pass filter circuit 1950. Buffer circuit 1010
Is a circuit connected to a subsequent stage to which a signal is to be distributed, which is a buffer circuit 1320, 1520, 172 in FIG.
It is required that the current capacity that can be transmitted is large in response to the number being greater than 0 and 1920.

5 MHz band pass filter circuit 1330
And the signals distributed to the 15 MHz band pass filter circuit 1340 are averaged by averaging circuits 1350 and 1360, respectively. Dividing circuit 1370 obtains the ratio of the signal intensities averaged by averaging circuits 1350 and 1360, respectively, and outputs the obtained value of the ratio to level-distance conversion circuit 1380. Level-distance conversion circuit 1380
Converts a ratio value into a transmission distance based on a given transmission path attenuation characteristic, and outputs a signal indicating the converted transmission distance to an output circuit 1090.

The 330 kHz low-pass filter circuit 103
The signal converted into a telegram presence / absence signal indicating the presence / absence of a telegram by 0 is further distributed to a voltage comparison circuit 1110 and a voltage comparison circuit 940.

Voltage comparison circuit 1110 determines the presence or absence of a message based on the reference value from reference value generation circuit 1120. The setting of the reference voltage from the reference value generation circuit 1120 is as follows:
The voltage is selected as an intermediate voltage between the peak voltage of the waveform of the telegram presence / absence signal when a telegram is transmitted from one terminal and the peak voltage corresponding to the absence of the telegram. More specifically, for example, a voltage corresponding to the absence of a telegram is selected as the 0 level, and the reference voltage generated by the reference value generation circuit 1120 is set to 1 level.
It can be selected to be 0.7 times the voltage corresponding to the arrival of one message. When the voltage of the input signal waveform is higher than the voltage from reference value generation circuit 1120 (that is, at the time of the presence of a telegram that determines that there is a telegram), voltage comparison circuit 1110 determines whether the voltage from the reference value generation circuit 1120 is higher. When it is low (that is, when there is no telegram that determines that there is no telegram),
An output of a predetermined constant voltage is output to an integrating circuit 1130.
And an integration circuit 1140.

The integration circuit 1130 is supplied with a constant voltage at the time of a telegram, and integrates it. This makes it possible to output a signal waveform of a voltage corresponding to the message length. This output is determined by the voltage comparison circuit 1560 based on the signal from the reference value generation circuit 1570 to determine whether the message length is within the range defined in the specification. If the result of the determination indicates that the message length does not conform to the specifications, voltage comparison circuit 1560 outputs a signal for displaying a warning to output circuit 1990.

Further, the integration circuit 1140 integrates a constant voltage input when there is no telegram. As a result, it is possible to output a signal waveform having a voltage peak corresponding to the time when there is no message, that is, the message interval. This output is supplied to the reference value generation circuit 1 by the voltage comparison circuit 1760.
Based on the signal from 770, it is determined whether or not the message interval is shorter than a reference value defined in the network specification. If the voltage comparison circuit 1760 determines that the message interval is shorter than the reference, the voltage comparison circuit 1760 outputs a signal for displaying a warning to the output circuit 1090.

The other output of the low-pass filter circuit 1030 and the output from the low-pass filter circuit 1950 are processed in the same manner as in the above-described message collision abnormality detection unit 1900, and the message is output even though the network utilization is low. When a collision occurs, a signal for displaying a warning is output to the output circuit 1090.

Next, another embodiment of the physical information acquisition unit 1210 will be described with reference to FIG. The physical information acquisition unit 1210 according to this embodiment realizes each function by an integrated block configuration. In the present embodiment, the functions of determining the length of the message, the interval between the messages, and the utilization rate are realized by respectively calculating the clock generated by the oscillation circuit by counting it with the counter circuit. Is realized by calculating the ratio between the calculated message length count value and the count value of the message interval.

In the physical information acquisition unit 1210 of this embodiment, like the physical information acquisition unit 1210 shown in FIG. 11 described above, the buffer circuit 1020 includes the buffer circuit 1320 of the distance calculation unit 1300 shown in FIG. The buffer circuit 1520 of the message length measuring unit 1500 shown in FIG. 7 and the buffer circuit 1720 of the message interval measuring unit 1700 shown in FIG.
It corresponds to a circuit configured in common. The message collision abnormality detection unit 1900 does not have its own input part in order to use the measurement results of the message length measurement unit 1500 and the message interval measurement unit 1700 and the intermediate result.

The buffer circuit 1020 converts the signal fetched from the transmission line 1 into a 5 MHz band-pass filter circuit 13.
The signal is distributed to a 30, 15 MHz band pass filter circuit 1340 and a 330 kHz low pass filter circuit 1030.

5 MHz band pass filter circuit 1330
And the signal distributed to the 15 MHz band-pass filter circuit 1340 are transmitted to the physical information acquisition unit 12 shown in FIG.
The processing is performed in the same manner as 10. That is, the intensity ratio of the two signals is obtained, the value of the ratio is converted into a transmission distance, and output to the output circuit 1990.

330 kHz low-pass filter circuit 103
For a signal converted to a telegram presence / absence signal indicating the presence / absence of a telegram at 0, the telegram length and the telegram interval are measured by measuring the interval between the rise and the fall.

That is, the counter circuit 1540 counts the number of clock pulses generated by the oscillation circuit 1050 from when the rising / falling detecting circuit 1090 detects a rising edge to when the rising / falling detecting circuit 1090 detects a falling edge. Is measured.

The counter circuit 1740 counts the number of clock pulses generated by the oscillation circuit 1050 from when the rising / falling detecting circuit 1090 detects the falling edge to when the rising / falling detecting circuit 1090 detects the rising edge. To measure the message interval.

When the message length is measured by the counter circuit 1540 and the message interval is measured by the counter circuit 1740, the rise / fall detection circuit 1090 is used.
Are used as a start signal and a stop signal for counting clock pulses, respectively. At this time, the counter circuit 1540 and the counter circuit 1740 use:
Start and stop are used interchangeably. As a result, it is possible to measure the message length and the message interval with the output of one rising / falling detection circuit 1090.

The comparison circuit 1560 compares the message length measurement value measured by the counter circuit 1540 with the reference value generated by the reference value generation circuit 1570, and outputs the comparison result to the output circuit 1090.

Also, the comparison circuit 1760 compares the measured value of the message interval measured by the counter circuit 1740 with the reference value generated by the reference value generation circuit 1770, and outputs the comparison result to the output circuit 1090.

On the other hand, the division circuit 1150 divides the measured value of the message length measured by the counter circuit 1540 by the measured value of the message interval measured by the counter circuit 1740 to calculate the network utilization. Further, the voltage comparison circuit 194
0 indicates that the output of the low-pass filter circuit 1030 is
The value is compared with a reference value set by a reference value generation circuit 1945.
The reference voltage generated by the reference value generating circuit 1945 is set to a voltage higher than a normal case in which one message is transmitted through the transmission line 1, for example, a wave height of 1.3 times the voltage. Accordingly, it is possible to detect that the wave height of the voltage is increased due to the collision between the telegrams. By the gate / sample and hold circuit 1960,
The network usage rate obtained by the division circuit 1150 at the timing when the message collision detected by the voltage comparison circuit 1940 occurs is sampled, and the usage rate at the time of the message collision is monitored.

As described above, the transmission distance, the message length, the message interval, and the network utilization rate when a message collision occurs can be obtained by the circuit shown in FIG. The obtained information is output to the network management support system 2000 by the output circuit 1090. The output circuit 1090 can collectively manage such information. For example, triggered by the occurrence of a message collision, the measured transmission distance, message length, message interval,
It is displayed together with the warning display, so that the position of the terminal to be dealt with on the transmission line 1 and the state of the network at the time of occurrence of the failure can be displayed easily.

Next, with respect to the calculation of the transmission distance in distance calculating section 1300, an example of measuring the transmission distance from a terminal connected to an actual network will be described.

In an actual network, connected terminals are not always connected via the same type of transceiver. For this reason, it is shown that the present invention is applicable to a case where a plurality of types of transceivers connecting terminals are used.

First, referring to FIGS. 13 to 16,
The waveform transmitted by the transceiver for connecting the terminal to the transmission path will be described. FIGS. 13 to 16 show MiLAN (MiL-120A) (FIG. 13), Allied Telesis (MX10S) (FIG. 14), Allied Telesis (MX10) (FIG. 15), and ASANTE (10T), respectively.
17 is a graph in which signal waveforms are observed for transceivers of three companies and four types called HUB) (FIG. 16). 13 to 16, one scale on the horizontal axis is 100 nsec, and one scale on the vertical axis is 500 mV.

From the result of this measurement, it is considered that the output waveforms from the four types of transceivers are waveforms that coincide with each other, including the rise time and the fall time.
Therefore, for the signal waveforms transmitted from the above four types of transceivers, the intensity measured with a 5 MHz sine wave and
The ratio to the intensity measured with a 5 MHz sine wave is considered constant regardless of the transceiver. Therefore, it is considered that the relative positional relationship between the transceivers can be specified by measuring the signal intensities at these frequencies together and determining the intensity ratio therebetween. If the type of the cable is known, it is considered that the transmission distance from the signal source can be specified.

Next, in the case where sine wave components of 5 MHz and 15 MHz were selected as two different frequency regions for examining the intensity ratio, data for obtaining the transmission distance was collected. Hereinafter, the measurement of the signal waveform performed by changing the transmission distance from the terminal to the network management support apparatus 2000 in the transmission path 1 of the network to be managed illustrated in FIG. 1 will be described.

FIGS. 17 to 22 show that the transmission distance is changed.
It measures the intensity of some frequency components. The preamble part of the signal waveform is transformed into the frequency domain by the fast Fourier transform, and is converted into 5 MHz, 15 MHz,
The component intensities at the respective frequencies of 5 MHz, 35 MHz and 45 MHz were determined. In measuring, HP
(Hewlett Packard) GMBH HP813
0A (SN3339G01033) is input to the Allied Telesis (MX10S),
By sending a waveform corresponding to the preamble, a spectrum analyzer H of HP (Hewlett-Packard)
The waveform was observed with P54720D.

FIGS. 17 to 22 show that the distance from the terminal connected to the transmission line is 0 m and (FIG. 17) 10 m, respectively.
(FIG. 18), 20 m (FIG. 19), 50 m (FIG. 20), 1
It is the graph which showed the voltage intensity of each frequency component about the case of 00m (FIG. 20) and 180m (FIG. 21).

Referring to FIG. 25, the result of the measurement will be described. In the calculation of the transmission distance in this measurement, 5 MHz and 15 MHz were selected as two different frequency regions, and the intensity of the sine wave component at each of these two frequencies was obtained. Further, the ratio of the obtained strengths was obtained.

In FIG. 25, with respect to the power of each sine wave component at a frequency of 5 MHz and a frequency of 15 MHz, P _B is power expressed in dBm and P _W
Is the power expressed in units of mW. E is
It is a voltage expressed in mV. ΔP _B is
The logarithmic power ratio between 5 MHz and 15 MHz is expressed in dB. The voltage ratio is obtained by dividing the voltage of the 5 MHz sine wave component by the voltage of the 15 MHz sine wave component.

With reference to FIG. 23, the transmission distance dependence of the intensities measured for the sine wave component of the frequency 5 MHz and the sine wave component of the frequency 15 MHz will be described.

In FIG. 23, the transmission distance is shown on the horizontal axis in units of m, and the intensity is shown on the vertical axis in terms of the voltage in units of mv. The black diamond is a plot symbol indicating a measured value of a sine wave component at a frequency of 5 MHz, and the white square is a plot symbol indicating a measured value of a sine wave component at a frequency of 15 MHz. From the measurement results shown in FIG. 23, it is found that the voltage intensity of the 5 MHz frequency component is greater than the voltage intensity of the 15 MHz frequency component at any transmission distance, and that the respective voltage intensities increase as the transmission distance increases. Is shown to decrease monotonically.

Next, referring to FIG. 24, when the transmission distance is changed, the voltage intensity of the frequency component of 5 MHz and 1
The ratio of the frequency component of 5 MHz to the voltage intensity will be described.

In FIG. 24, the horizontal axis is meters (m).
, And the vertical axis represents the voltage ratio between the 5 MHz frequency component and the 15 MHz frequency component. From the analysis results shown in FIG. 25, the voltage ratio obtained by dividing the voltage intensity of the sine wave component of the frequency 5 MHz by the voltage intensity of the sine wave component of the frequency 15 MHz is greater than 1 at any transmission distance, and It is shown that the distance increases monotonically as the distance increases.

From the results of the above measurement and analysis, 5M
By measuring the voltage ratio between the frequency component of 15 Hz and the frequency component of 15 MHz, it is possible to uniquely determine the magnitude relationship of the transmission distance from the terminal that transmitted the message signal or the transceiver corresponding to the terminal group. It is concluded that it is possible to measure the transmission distance by using the relationship between the transmission distance and the voltage ratio shown in FIG.

As another method for physically observing the signal waveform of a message propagating through a transmission path and determining the distance from the terminal that transmitted the message, for example, at least two points on the transmission path are Measure the time when the message arrived,
A method of determining the difference between the measured times and determining the distance from the terminal from the determined difference based on the transmission speed of the signal on the transmission path may be used.

When a terminal sends a message that does not comply with the specifications defined in the network, the network management method for identifying the terminal based on normal logical specifications may not identify the address of the terminal that sent the message. This makes it difficult to isolate the obstacle. In the network management support apparatus 10 to which the present invention is applied, the distance from the terminal that transmitted the message can be obtained by using the physical properties of the electric signal that constitutes the message. Therefore, even if the address cannot be read,
It is possible to know the transmission distance from the terminal that sent the waveform. Further, it is possible to grasp the relative positional relationship on the transmission path between the other terminal and the terminal that has transmitted a message that does not conform to the specifications. This facilitates the task of isolating the location where the failure has occurred. When a multi-port transceiver to which a plurality of terminals are connected is connected, by considering a plurality of terminals connected to the same multi-port transceiver as one terminal group, the
The mutual relative positional relationship can be specified.

Note that the information set may be configured by associating the intensity ratio itself with the address. Then, the information sets can be sequentially accumulated to form an information group as shown in FIG. The information group can be rearranged in the network management system 2000 using the intensity ratio as a key, as shown in FIG. By using the rearranged and organized information group, it is possible to output the arrangement order along the transmission line 1 for each of the terminals. Therefore, it is possible to support grasping the arrangement order of the terminals connected to the transmission line 1 even if the distance is not absolutely measured.

Further, even if the logical information acquisition unit 1220 cannot read the address of any of the terminals, the information of the address of the adjacent terminal can be obtained, so that the terminal can be easily specified. .

By the way, the physical information acquisition unit 1210 to which the present invention is applied can grasp the relative magnitude of the distance to the terminal that transmitted the message without checking the frequency characteristics of attenuation in the transmission line to which the physical information is applied. It is possible. Further, the configuration of distance calculating section 1300 is also equivalent to level-to-distance conversion circuit
Is omitted, the relative relationship can be grasped, so that the level-to-distance conversion circuit 1380 can be omitted, and the physical information acquisition unit 1210 can be realized with a simple configuration. As described above, even in the network management support device 10 including the simply configured physical information acquisition unit 1210, it is possible to grasp the arrangement order of the terminals or the terminal groups. Therefore, most terminals, or
If you know the location of the device group,
It is possible to easily grasp the configuration state of the network and its change. In addition, even when an error occurs in a terminal, such as transmitting a message waveform that does not conform to the network specifications, it is possible to efficiently support the isolation of a failure point.

Next, with reference to FIGS. 30 to 37, a procedure for creating a network configuration diagram by the information processing device 2200 will be described.

FIG. 31 shows a transmission line 1 laid along a route S in a laying area A in which a network is laid. The information of the route S is stored in the information storage device 2100 in advance, for example, in a format as shown in FIG.

FIG. 32 shows the sections B1 to B7 of the installation area A defined in advance. Sections B1 to B7 are, for example,
It can be described by a boundary between sections or a polygon corresponding to the section. These categories are
It can be defined according to the attributes of the location where the network is laid. For example, for B1 to B6, information corresponding to each room in the laying area A, and for B7,
Classification information can be defined as information corresponding to the corridor. Further, the division may be defined according to the use form of the floor surface. For example, the division can be defined for each power supply system, according to information such as inside and outside the firewall of the network.

FIG. 33 shows a positional relationship in which the positions on the path S of the connection points N0 to N7 of the terminals connected to the transmission path are defined. Such a position on the route S can be obtained according to the transmission distance of a message from each terminal connected to the transmission line 1 acquired by the information acquisition device 1200. Then, from the obtained transmission distance, a distance s from a predetermined reference point on the transmission path is obtained, and the connection point information indicating the position of each connection point is obtained by using the distance s as a coordinate of the distance s on the path S. Can be described. For example, FIG.
7, the names of the connection points N0 to N7,
Information describing the respective coordinates s0 to s7 is stored in the storage device 2220 together with the identification number of the information.

FIG. 34 shows a configuration diagram created by combining the information shown in FIGS. 31, 32, and 33. Such a configuration diagram displays the section of the laying area A according to the section information, draws the path S of the transmission line 1 on the area A according to the path information, and draws the path S according to the connection point information. It can be created by drawing each connection point on the route S.

As described above, by using the transmission distance acquired by the information acquisition device connected to the transmission path as the coordinates of each connection point on the path S, the connection point information can be dynamically acquired. it can. That is. It is possible to create a configuration diagram reflecting real-time changes, additions, deletions, etc. of the physical network form of the network.

When the display of the sections is not necessary because the installation area A is relatively small, the drawing of the sections can be omitted, and the storage of the above-mentioned section information is not required.

Here, as shown in FIG. 35, symbols displayed in different display modes can be used as symbols used to symbolize terminals. Then, it is possible to create a configuration diagram in which each symbol is displayed in a different display mode according to the attribute defined for each terminal. As such a configuration diagram, for example, FIG.
6 can be created. Displaying such a configuration diagram makes it easy for the administrator to grasp the attributes of each terminal connected to the network. Of course, the form of the symbol itself may be changed.

As such attributes of the terminal, a predetermined attribute may be stored in advance in the information storage device 2100 and used, or information corresponding to information of a message may be obtained and used by the information obtaining device 1200. You may.

Information determined in advance in the terminal includes the type of terminal device (notebook type, integrated type, desktop type, tower type, server, client type, etc.), asset number, user of terminal device, connection The attributes of the interface (LAN card, NIC card, etc.) and comments on the terminal can be used.

As the information corresponding to the message information, for example, information indicating whether the message conforms to the specifications of the network can be used. More specifically, the message length, the message interval, and the network utilization rate when the messages collide can be used.

Further, a change in the connection state of the terminal that has transmitted the message may be used. For example, according to information such as address changes, movement of attachment points, and additions / removals,
The display mode of the symbol can be changed.

As described above, the information acquisition device 1200 is displayed by displaying the configuration diagram of the network showing the route of the transmission line and the location of the terminals connected to the transmission line in the installation area where the network is installed. The information of the terminal and the message that is dynamically acquired by the terminal is displayed together with the position where the terminal is physically located in a state that the network administrator can easily grasp. Therefore, it is easy to detect a network failure and specify a failure factor, and it is possible to effectively support network management.

Next, a specific screen display for supporting network management, which is displayed by the network management support apparatus 10 to which the present invention is applied, will be described.

First, a main menu screen for selecting a function of the network management support apparatus 10 will be described with reference to FIG. This main menu screen is displayed first after the display function is activated. Of course, it is possible to return to the main menu from another state by the operation of the network administrator.

In FIG. 38, a title bar 4010 indicating the status of the currently operating function is displayed at the top of the screen, and a command menu 40 for selecting another function is displayed.
20 is displayed below the title bar 4010. Then, a node number display unit 4014 indicating the number of nodes indicating the total number of detected terminals, and a connection point information display unit 4 displaying the address of the terminal and the position of the terminal on the transmission path in association with each other
016, and a receive button 4018 for receiving an instruction to receive information from the information acquisition device 1200, a configuration diagram button 4020 for receiving an instruction to display a network configuration diagram, and a graph showing the status of the network. Graph button 4 to accept instructions
022 is displayed. The receive button 4018, the configuration diagram button 4020, and the graph button 4022 can be designated by a cursor whose display position is designated by operating a pointing device or the like.

FIG. 39 shows an example of a graph indicating the state of the network displayed when the graph button 4022 is operated. FIG. 39 is an example of a graph for monitoring a message collision occurring at a low utilization rate. FIG.
In the graph, the vertical axis represents the network utilization rate, the horizontal axis represents the time at which the state is reached, and the curve represents the transition of the network utilization rate. The occurrence of a collision between telegrams is represented by a plot symbol such as an asterisk. The plot symbols are displayed in different display modes using a predetermined network utilization rate as a threshold. That is, a message collision that occurs below the threshold value can be highlighted to call attention.

FIG. 40 shows a load screen displayed when the reception button 4018 is operated. In FIG. 40, the total number of detected terminals, 72, is displayed in the node number display section 4014. Then, the connection point information display section 40
16, an address uniquely defined for each terminal and a distance to a connection point of the terminal are displayed in association with each other.

FIG. 41 shows an example of a configuration diagram displayed by operating the configuration diagram button 4020.

In FIG. 41, a connection point of a transmission line symbol 3200 symbolizing a transmission line and an information acquisition device 1200 serving as a reference point for determining a transmission distance on the path S is provided in a configuration diagram display area 2310 where a configuration diagram is displayed. Are displayed on the display device 2300, a device symbol 3500 that symbolizes the terminal, terminal symbols 3100a and 3100b that symbolize terminals connected to the transmission path, and a label 3300 that indicates the address of each terminal.

As the symbol 3100, as shown in FIG. 41, a picture corresponding to a terminal type such as a desktop type, an integrated type, and a tower type can be used. Then, the information is displayed in a display mode corresponding to the information of the message transmitted from each terminal. For example, the symbol 3100a and the symbol 310
0b is displayed in a manner in which the brightness is reversed.

FIG. 42 shows another example of the configuration diagram. FIG.
, A transmission line symbol 3200 symbolizing a transmission line indicating a transmission line to which the information acquisition device 1200 is connected, and a symbol 310 symbolizing a terminal directly connected to the transmission line.
0, a terminal symbol 3101 symbolizing a connection device such as a concentrator connected to the transmission line, and a transmission line symbol 3201 symbolizing a transmission line connected via the connection device.
And a terminal symbol 3102 symbolizing a terminal connected via the connection device.

For the transmission path to which the information acquisition device 1200 is connected, terminals connected via the connection device and terminals directly connected are distinguished and displayed as shown in FIG. It can assist in understanding the logical configuration.

Then, segment display areas B1, B2, and B3 are displayed, each indicating a segment defined by the transmission distance to the information acquisition device 1200. By displaying the section display areas B1, B2, and B3 indicating the transmission distances in this way, the terminal to be connected can be managed for each section of the transmission distance. For example, it is possible to define and manage the division of the transmission distance in accordance with the division of each floor and each room in the building in which the network is laid.

With reference to FIG. 43, another example of the configuration diagram will be described. FIG. 43 is an example of a configuration diagram reflecting a physical location of a terminal connected to a network. In FIG. 43, a display area 3310 indicating a floor, that is, a division for each floor, a display area 3320 indicating a division on a floor, and a terminal symbol arranged to reflect the physical position of the arrangement. 3100 is displayed. In this way, by using a configuration diagram that reflects the physical location of the terminal, the terminal that requires maintenance work, such as a cause of failure, is specified, and the location where the terminal is installed is easily displayed. can do.

[0145] Here, a plurality of terminals are connected via a concentrator.
When connected to the same connection point on the transmission line, FIG.
Can be displayed as shown in FIG. That is, FIG.
, A concentrator symbol 310 symbolizing the concentrator
1 and a terminal symbol 3102 symbolizing a terminal connected to the line concentrator and a terminal symbol 3100 symbolizing a terminal directly connected to the transmission line.

Note that only the symbol 3101 indicating the line concentrator may be displayed, and when an operation of selecting this symbol is received, a terminal symbol symbolizing a terminal connected via the line concentrator may be displayed. The display of the terminal connected via the line concentrator may be performed by switching the entire screen, or may be displayed by superimposing a small screen surrounded by a frame and displaying in the small screen. .

By displaying the screen as described above, information indicating the configuration of the network can be easily transmitted to the network administrator.

[0148]

According to the present invention, a network configuration diagram that allows a terminal connected to a network to easily recognize a physical configuration indicating a physically installed position is displayed, and a failure occurs in the network. Can be detected and displayed on the network configuration diagram to facilitate the grasp of the terminal that is causing the failure and to support management such as recovery or elimination of the terminal.

[0149] It is also possible to assist in grasping the transition of the state of the connected device.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a connection configuration between a network management support device of the present invention and a network to be managed.

FIG. 2 is a functional block diagram of the network management support device of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a distance calculation unit.

FIG. 4 is a waveform chart showing an output waveform at each point of an internal circuit of the distance calculation unit.

FIG. 5 is a block diagram showing a configuration of a message length measuring unit.

FIG. 6 is a waveform chart showing an output waveform at each point of an internal circuit of the message length measuring unit.

FIG. 7 is a block diagram illustrating a configuration of a message interval measuring unit.

FIG. 8 is a waveform chart showing an output waveform at each point of an internal circuit of the message interval measuring unit.

FIG. 9 is a block diagram illustrating a configuration of a message collision abnormality detection unit.

FIG. 10 is a waveform diagram showing an output waveform at each point of an internal circuit of the message collision abnormality detection unit.

FIG. 11 is a block diagram of a physical information acquisition unit of a network management support device according to a second embodiment of the present invention.

FIG. 12 is a block diagram of a physical information acquisition unit of a network management support device according to a third embodiment of the present invention.

FIG. 13 is a graph showing a measurement result of an output waveform of the transceiver A;

FIG. 14 is a graph showing a measurement result of an output waveform of the transceiver B;

FIG. 15 is a graph showing a measurement result of an output waveform of the transceiver C;

FIG. 16 is a graph showing a measurement result of an output waveform of the transceiver D;

FIG. 17 is a graph showing the measurement results of the intensity of each odd-order harmonic at a transmission distance of 0 m.

FIG. 18 is a graph showing the measurement results of the intensity of each odd-order harmonic at a transmission distance of 10 m.

FIG. 19 is a graph showing the measurement results of the intensity of each odd-order harmonic at a transmission distance of 20 m.

FIG. 20 is a graph showing the measurement results of the intensity of each odd-order harmonic at a transmission distance of 50 m.

FIG. 21 is a graph showing the measurement results of the intensity of each odd-order harmonic at a transmission distance of 100 m.

FIG. 22 is a graph showing the measurement results of the intensity of each odd-order harmonic at a transmission distance of 180 m.

FIG. 23 is a graph showing a change in intensity of a 5 MHz component and a 15 MHz component with respect to a transmission distance.

FIG. 24 is a graph showing the dependence of the intensity ratio on the transmission distance.

FIG. 25 is a table showing measurement results.

FIG. 26 is a block diagram illustrating a configuration example of an information acquisition unit.

FIG. 27 is an explanatory diagram showing an information group stored in association with a signal intensity ratio and an address of a terminal.

FIG. 28 is an explanatory diagram showing information groups rearranged using the intensity ratio as a key.

FIG. 29 is an explanatory diagram showing a laying area where a transmission line is laid, and a route thereof.

FIG. 30 is an explanatory diagram showing an example of a storage format of route information.

FIG. 31 is an explanatory diagram showing a route of a transmission line in an installation area.

FIG. 32 is an explanatory diagram showing the division of the installation area.

FIG. 33 is an explanatory diagram showing positions of connection points on a route in transmission distance coordinates.

FIG. 34 is an explanatory diagram showing an example of a configuration diagram created using route information, section information, and connection point information.

FIG. 35 is an explanatory diagram showing an example of symbols used for display on a terminal.

FIG. 36 is an explanatory diagram showing an example of a configuration diagram in which symbols displayed in a display mode corresponding to the state of the terminal are arranged.

FIG. 37 is an explanatory diagram showing an example of a storage format of connection point information.

FIG. 38 is an explanatory diagram showing an example of a main menu screen of the network management support device to which the present invention has been applied.

FIG. 39 is an explanatory diagram showing an example of a graph for monitoring a message collision;

FIG. 40 is an explanatory diagram showing an example of a screen in a state where information is acquired from the information acquisition device.

FIG. 41 is an explanatory diagram showing an example of a configuration diagram of a network.

FIG. 42 is an explanatory diagram showing another example of a configuration diagram of a network.

FIG. 43 is an explanatory diagram showing another example of a configuration diagram of a network.

FIG. 44 is an explanatory diagram showing another example of a configuration diagram of a network.

[Explanation of symbols]

1 ... transmission line, 2a, 2b, 2c ... connection point, 3, 4, 5 ...
Terminal, 6: Terminal group, 7a, 7b: Termination, 8: Transceiver, 9: Multiport transceiver, 10: Network management support device, 1020: Buffer circuit, 1030 ...
330 kHz low-pass filter circuit, 1050 oscillation circuit, 1070, 1090 rise / fall detection circuit, 1110 voltage comparison circuit, 1120 reference value setting circuit, 1130, 1140 integration circuit, 1150 division circuit, 1200 information acquisition Device, 1210: Physical information acquisition unit, 1220: Logical information acquisition unit, 1300: Distance calculation unit, 1320: Buffer circuit, 1330: 5 MHz bandpass filter circuit, 1340: 15 MHz bandpass filter circuit, 1350, 1360: Averaging circuit , 1
370: division circuit, 1380: level-distance conversion circuit, 1390: output circuit, 1500: message length measurement unit,
1520: buffer circuit, 1530: low-pass filter circuit, 1540: counter circuit, 1550: oscillation circuit,
1560: comparison circuit, 1570: reference value generation circuit, 15
80 output circuit, 1590 rising / falling detection circuit, 1600 message length measuring circuit, 1700 message interval measuring unit, 1720 buffer circuit, 1730 low-pass filter circuit, 1740 counter circuit, 1750
... Oscillation circuit, 1760... Comparison circuit, 1770... Reference value generation time, 1780... Output circuit, 1790.
Fall detection circuit, 1800 ... Electronic message interval measurement circuit, 1
900: message collision abnormality detection unit, 1920: buffer circuit, 1930: low-pass filter circuit, 1940: voltage comparison circuit, 1945: reference value generation circuit, 1950: low-pass filter circuit, 1960: gate / sample hold, 1970, 1990: output Circuit, 2000: Network management support system, 2100: Information storage device,
2200: information processing device, 2210: arithmetic device, 222
0 ... Storage device, 2230 ... Interface, 2250 ...
Storage medium reading device, 2260: Storage medium, 2300: Display device, 3100a, 3100b, 3101, 3102
... terminal symbols, 3200, 3201 ... transmission line symbols, 3310, 3320 ... section boundary display areas, 4010
... Title bar, 4012 ... Command menu, 401
4. Node number display section, 4016 Connection point information display section, 4
018: Receive button, 4020: Configuration button, 402
2 ... Graph button.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naoyoshi Machida 504-2 Shinanomachi, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Electronics Service Co., Ltd. (72) Inventor Tadayuki Ichiba 504-2 Shinanomachi, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi Electronic Service Co., Ltd.

Claims (9)

[Claims] 1. A network management support device for supporting management of a network in which a plurality of terminals are connected to a transmission path and used for transmitting information between the connected terminals, wherein: Connected, an information acquisition device for acquiring information on the message sent on the transmission line, a display device for displaying an image, and a terminal arranged on the transmission line with reference to the information on the message. An information processing device for creating a network configuration diagram reflecting the physical position of the electronic device, and displaying the created network configuration diagram on the display device, wherein the information acquisition device observes a signal waveform of the message. hand,
The information processing device acquires transmission distance information on the transmission path up to the terminal that transmitted the message, and the information processing device connects the respective terminals that transmitted the message based on the transmission distance information acquired by the information acquisition device. The position of the connection point is determined on the transmission path, a transmission path symbol indicating the transmission path of the network is displayed, and a symbol for symbolizing a terminal is placed on the transmission path symbol on the transmission path. A network management support device, which creates a network configuration diagram in which physical positions where terminals are arranged are reflected, and displays the created network configuration diagram on the display device. 2. The information acquisition device according to claim 1, wherein the information acquisition device observes a signal waveform of the message,
The transmission distance is obtained, and the message compatibility information indicating whether or not the message conforms to the specification defined in the network is obtained.The information processing device obtains the symbol by the information acquisition device. A network management support device that creates a network configuration diagram that is displayed as different display modes according to differences in message compatibility information. 3. The information storage device according to claim 1, wherein the information storage device stores in advance terminal information that is defined in advance for a terminal that is assumed to be connected to the network. The device retrieves, from the information storage device, terminal information defined for the terminal from which the information has been acquired by the information acquiring device, and displays the symbol in a different display mode corresponding to the retrieved terminal information. A network management support device for creating a network configuration diagram to be displayed as an image. 4. The information processing apparatus according to claim 3, wherein the terminal information includes terminal identification information for individually identifying the terminals that are assumed to be connected to the network, A network management support apparatus for creating a network configuration diagram in which labels used for displaying the terminal identification information are displayed along with the symbols. 5. A network management support device for supporting management of a network used for transmitting information between a plurality of connected terminals, a display device for displaying an image, and a transmission path of the network. An information acquisition device for acquiring information of a message transmitted through the transmission path, an information storage device in which path information indicating a path on which the transmission path is laid is stored, and information of the message. And an information processing device for creating a network configuration diagram reflecting a physical position where the terminal is arranged, with reference to the route information, and displaying the created network configuration diagram on the display device. The information acquisition device observes a signal waveform of the telegram,
The information processing device acquires transmission distance information on the transmission path up to the terminal that transmitted the message, and based on the transmission distance information acquired by the information acquisition device, connects the respective terminals that transmitted the message. Determine the coordinates of points on the transmission path, and create a network configuration diagram in which symbols for symbolizing terminals connected to the network are arranged reflecting the connection positions of the terminals in the installation area where the network is installed. And a network management support device for displaying the created network configuration diagram on the display device. 6. A network management method for supporting management of a network used for transmitting information between a plurality of connected terminals, wherein a signal waveform of a message transmitted on a transmission line of the network is observed. The transmission distance on the transmission path to the terminal that transmitted the message is determined, and the coordinates of the connection point of each terminal that transmitted the message on the transmission path are determined based on the determined transmission distance. Referring to the prepared route information indicating the route on which the route is laid, the symbol for symbolizing each of the plurality of terminals reflects the connection position of the terminal in the laying area where the transmission line is laid. A network management method, comprising: creating a network configuration diagram to be arranged by means of a computer; and displaying the created network configuration diagram. 7. A storage medium on which a program is recorded in a machine-readable manner, wherein a signal waveform of a telegram transmitted on a transmission path of the network is observed, and the transmission on the transmission path to a terminal which transmitted the telegram is performed. The distance is obtained, and based on the obtained transmission distance, the coordinates on the transmission path of the connection point of each terminal that has sent the message are obtained, and the path information prepared in advance indicating the path on which the transmission path is laid is obtained. Referring to FIG. 3, a symbol for symbolizing each of the plurality of terminals is created, and a network configuration diagram is arranged in which the connection positions of the terminals in the installation area where the transmission lines are installed are reflected. A storage medium storing a program for causing the computer to execute the display of the configuration diagram. 8. A network management support apparatus for supporting a management of a network in which a plurality of terminals are connected to a transmission path and used for transmitting information between the connected terminals, wherein the network is laid. A network management support device comprising: a configuration diagram display unit for displaying a configuration diagram of a network in a region, the configuration diagram showing a route of a transmission path and an arrangement position of a terminal connected to the transmission path. 9. The network according to claim 8, wherein said configuration diagram display means displays a symbol for symbolizing the terminal in a display mode corresponding to a state of a message transmitted from the terminal to the transmission path. Management support device.