JP2699944B2 - Bus monitoring system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus monitoring system, and more particularly, to a bus monitoring system that eliminates a section in a bus (signal path) where monitoring is not performed at all and performs monitoring without leakage.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show bus monitoring systems which perform monitoring without omission by eliminating a section in which monitoring is not performed at all. In this example, the bus monitoring is performed using the monitoring bit.

[0003] In the examples shown in FIGS. 6 and 7, the monitoring section A to the monitoring section C of the signal path 1 are illustrated. Three monitoring devices are connected to the signal path 1 in the illustrated portion. Each of the monitoring devices inserts a monitoring bit into a vacant time slot of a signal.
1, 31 and monitoring bit detectors 12, 22, and 32 for reading monitoring bits from predetermined time slots of the signal.

[0006] As shown in FIG.
When the monitoring bit A1 is inserted by the monitoring bit detection unit 12 and the monitoring bit A1 is detected by the monitoring bit detection unit 12, the monitoring bit detection unit 12
It is determined that there is no abnormality in the signal path from the installation position of No. 1 to the installation position of the monitoring bit detection unit 12.

Similarly, the monitor bit detector 22 uses the monitor bit B1 to output the monitor bit inserter 2 in the monitor section B.
1 to determine whether there is an abnormality in the signal path from the installation position of the monitoring bit detection unit 22 to the installation position of the monitoring bit detection unit 22. Further, the monitoring bit detection unit 32 uses the monitoring bit C1 to determine the occurrence of some abnormality in the monitoring section C. Monitor.

For each of the monitoring sections A, B, and C,
Monitoring has not been performed on the downstream side of the monitoring bit detectors 12, 22, 32. Regarding the signal path of this part, the previous section monitoring bit detectors 14 and 2 shown in FIG.
4 to monitor. That is, the monitoring bit insertion unit 11
When the monitoring bit A1 inserted in (1) is detected by the preceding section monitoring bit detection unit 14, it can be determined that there is no abnormality in the remaining part of the monitoring section A. The remaining part of the monitoring section B is monitored by the previous section monitoring bit detection unit 24 installed in the monitoring section C.

The monitoring bits A1, B1 and C1 are generated by respective monitoring bit generators. Therefore, the monitoring bit generators 111, 121, and 13 that generate the respective monitoring bits are provided in the monitoring bit insertion units 11, 21, and 31.
1 is attached. Further, the monitoring bit detector 12,
The monitoring bit generator 11 generates normal monitoring bits for each of the monitoring bits 22 and 32 in order to determine whether the monitoring bits detected from the time slots are normal.
2, 122 and 132 are provided side by side.

For this reason, the monitor bit detector 12 compares the detected monitor bit with the monitor bit input from the monitor bit generator 112, and if they match, determines that the signal path is normal. If they do not match, it is determined to be abnormal. The same applies to the monitoring bit detectors 22 and 32. In addition, the monitoring bit generators 114 and 124 are also provided in the preceding section monitoring bit detectors 14 and 24, respectively.

Next, the operation will be described.

In the monitoring section A, an arbitrary fixed bit (monitoring bit) generated by the monitoring bit generating section 111 is inserted into an empty time slot of the main signal by the monitoring bit inserting section 11.

The monitor bit detector 12 includes a fixed bit inserted by the monitor bit inserter 11 and a fixed bit output from the monitor bit generator 112 for generating a fixed bit having the same bit pattern as the fixed bit. Are compared, and if they do not match, it is determined to be abnormal. That is,
It is determined that the signal path in the monitoring section A has failed.

In the monitoring sections B and C, as in the monitoring section A, arbitrary fixed bits generated by the monitoring bit generating sections 121 and 131 are inserted into the main signal empty time slots by the monitoring bit inserting sections 21 and 31. The monitoring bit detection units 22 and 32 monitor the fixed bits by detecting the fixed bits and comparing them with arbitrary fixed bits generated by the monitoring bit generation units 122 and 132 that generate the fixed bits.

Since the connection monitoring between the monitoring sections in the above-described monitoring method is leaked, the preceding section monitoring bit detection sections 14 and 24 immediately before the monitoring bit detection sections 22 and 32 in the next monitoring section.
Is installed. Previous section monitoring bit detectors 14, 24
Detects any fixed bit inserted by the monitoring bit insertion units 11 and 21 and compares it with any fixed bit generated by the monitoring bit generation units 114 and 124 that generate the same fixed bits so that there is no leakage. We are monitoring.

Therefore, the monitoring bit insertion units 11, 21, 21
The empty time slots into which the monitoring bits are inserted at 31 are respectively inserted using empty time slots other than the time slots used in the previous monitoring section.

[0015]

In the above-described bus monitoring system, the insertion of a monitoring bit from one location requires two bits.
By performing monitoring bit detection (monitoring bit detection unit and previous section monitoring bit detection unit) at three locations, bus monitoring without leakage is realized. However, in this method, three monitoring bit generation units are used, and There is a problem that the scale increases.

In particular, in a monitoring system that requires the use of complicated monitoring bits, such as when there are a large number of signal paths in the apparatus, it is necessary to install monitoring bit generation units for generating the complicated monitoring bits at three locations. Therefore, the adverse effect of increasing the circuit scale is significant.

For example, in monitoring a signal path in which an erroneous connection may occur, a monitoring bit is changed for each signal path in a signal path in which an erroneous connection may occur. In this case, a monitoring bit must be defined from an ID unified inside a transmission device having a monitoring target bus. Then, the bus monitoring system is specialized for this device, and has very low versatility.

As described above, in order to monitor human error such as erroneous connection of a cable or the like, if it is necessary to monitor using a different monitoring bit pattern for each signal path connection unit, the possibility of erroneous connection is reduced. Accordingly, since the pattern of the monitoring bit becomes more complicated, there is an inconvenience that the scale of the monitoring bit pattern generation circuit functioning as the monitoring bit generator increases.

Further, in such a case, since it is inevitable to specialize in a device having a bus to be inspected, an LSI for realizing a monitoring bit generation unit for generating a complicated monitoring bit is manufactured. There is a disadvantage that the versatility of this LSI becomes extremely low.

Further studying this problem, it is necessary to perform a bit pattern for monitoring a portion where an erroneous connection occurs due to an artificial connection error or the like by using a complicated monitoring bit different for each connection unit. On the other hand, there is no need to use a different monitoring bit pattern for each connection unit downstream of the portion where the erroneous connection occurs.

However, in the example shown in FIG. 6 and FIG.
In the monitoring of the monitoring bit inserted at the second location at the second location (previous section monitoring bit detection unit), monitoring is performed using complicated monitoring bits corresponding to the possibility of erroneous connection. Therefore,
The previous section monitoring bit detection unit is provided with a monitoring bit generation unit that generates a complicated monitoring bit.

In the example shown in FIGS. 6 and 7, this is a portion such as a connector between the monitoring bit insertion section 21 and the monitoring bit detection section 22 in the monitoring section B where an erroneous connection may occur. The monitoring bit must be different from the monitoring bit of the monitoring section in which there is a possibility of incorrect connection. For this reason, the monitoring bit generation unit 12 provided in the monitoring bit insertion unit 21 and the monitoring bit detection unit 22 respectively.
1, 122 need to be individually manufactured for each connection unit of the signal path according to the device.

However, even if an erroneous connection cannot occur on the downstream side of the monitor bit detector 22, the monitor bit generator 124 provided in the preceding section monitor bit detector 24 must generate the monitor bit B1. . In other words, the section in which erroneous connection cannot occur is monitored. However, in the method shown in FIG. 7, the signal path must be individually manufactured for each connection unit.

As described above, if the monitoring bit is made complicated so that the erroneous connection can be determined in the monitoring section where the erroneous connection may occur, the monitoring section immediately after the monitoring bit is complicated even though it is not necessary for monitoring. We have come to discover the problem that we need to generate various monitoring bits.

[0025]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bus monitoring system for monitoring a signal path (bus) without omission using a monitoring bit, in order to monitor a signal path in which an erroneous connection may occur, an individual monitoring bit is provided for each connection unit. It is an object of the present invention to provide a bus monitoring system that can reduce the total number of monitoring bit generation units specialized for a device even if it is assigned, and can thereby increase the versatility.

[0026]

Therefore, according to the present invention, as a first means, a first monitoring device installed on the upstream side of a signal path (bus) through which a signal is transmitted / received by a transmission device, A second monitoring device installed in a signal path downstream of the position where the one monitoring device is installed. In addition, the first monitoring device includes a monitoring bit insertion unit that inserts a monitoring bit into the main signal of the signal path, a monitoring bit that reads the monitoring bit from the main signal of the signal path, and that is downstream of the monitoring bit insertion unit based on the monitoring bit. A monitoring bit detection unit that determines whether there is an abnormality in the signal path on the side, and a comparison bit insertion unit that inserts monitoring bits having a predetermined relationship with the monitoring bits inserted by the monitoring bit insertion unit into the signal path. Have. Further, the second monitoring device includes a comparison bit detection unit that determines whether there is an abnormality in the signal path downstream of the position where the monitoring bit detection unit is installed based on the monitoring bit and the comparison bit read from the signal path. Equipped.

In the first means, the comparison bit insertion unit inserts a monitoring bit having a predetermined relationship with the monitoring bit inserted by the monitoring bit insertion unit into the signal path. The predetermined relationship may be, for example, the same bit pattern as the monitoring bit, or a simplified monitoring bit.

Further, the comparison bit detector determines whether there is an abnormality in the signal path downstream of the position where the monitor bit detector is installed, based on the monitoring bits and the comparison bits read from the signal path. For this reason, the comparison bit detection unit monitors the signal path without generating a monitoring bit having the same bit pattern as the monitoring bit inserted by the monitoring bit insertion unit.

As a second means, in addition to the items for specifying the first means, the monitor bit detector is provided with an installation position of the monitor bit inserter when the monitor bit detector determines that there is an abnormality in the signal path. A first abnormal alarm generating section for externally displaying an alarm on a signal path from the signal path to the monitoring bit detecting section is provided. In addition, when the comparison bit detection unit determines that there is an abnormality in the signal path, the comparison bit detection unit externally displays an alarm on the signal path from the monitoring bit detection unit to the comparison bit detection unit. An alarm generator is provided.

In the second means, the first abnormality alarm generator outputs an abnormality alarm to the signal path between the packages when the monitoring bit detector determines that there is an abnormality. Further, the second alarm generator externally outputs an abnormality alarm for a signal path in the package when the comparison bit detector determines that there is an abnormality.

In the third means, in addition to the matter specifying the first or second means, a monitoring bit insertion unit is provided for connecting the connection terminal of one of the parallel cables each having a connection terminal in the signal path. Installed on the upstream side, the monitoring bit insertion unit is provided with a monitoring bit generation unit that generates a monitoring bit predefined according to the number of parallel cables and outputs the monitoring bit to the monitoring bit insertion unit, The monitoring bit detection unit was installed downstream of the connection terminal of the cable.

In the third means, in addition to the items specifying the first or second means, the first monitoring device is installed in a signal path where an erroneous connection may occur, and the second monitoring device is installed immediately thereafter. Therefore, the monitoring bit in the first monitoring device is individually assigned to each cable, so that the erroneous connection is monitored well. Furthermore, even if monitoring bits are not individually assigned to the second monitoring device, the comparison bit detection unit determines an abnormality in the signal path based on the relationship between the monitoring bits detected from the signal path and the comparison bits. Therefore, the second monitoring device:
It does not require the individual monitoring bits required by the first monitoring device.

In the fourth means, in addition to the items for specifying the first or second means, a first monitor bit generation unit for outputting a predetermined monitor bit to the monitor bit insertion unit to the monitor bit insertion unit. The monitoring bit detector has the first
And a second monitor bit generator that generates the same monitor bit as the monitor bit generated by the monitor bit generator and outputs the monitor bit to the monitor bit detector and the comparison bit inserter.

In the fourth means, since the comparison bit detection section does not require a monitoring bit generation section, the number of monitoring bit generation sections is reduced compared to the prior art, and a signal path without leakage is monitored.

In the fifth means, in addition to the items for specifying the second means, the monitor bit detecting section determines whether there is an abnormality in the signal path by the monitor bit detecting section and outputs the signal to the main signal of the signal path. An alarm suppression bit insertion unit that inserts an alarm suppression bit is also provided, and when the comparison bit detection unit reads the alarm suppression bit from the main signal of the signal path, an abnormal alarm from the monitoring bit insertion unit to the monitoring bit detection unit is detected. Equipped with a mask function to suppress occurrence.

In the fifth means, the alarm suppression bit insertion unit inserts the alarm suppression bit when the monitoring bit detection unit determines that the signal path is abnormal. When the alarm suppression bit is read from the main signal in the signal path, the comparison bit detection unit suppresses the occurrence of an abnormal alarm from the monitoring bit insertion unit to the monitoring bit detection unit. However, the abnormal state does not affect downstream monitoring.

[0037]

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

FIG. 1 is a block diagram showing a configuration of a bus monitoring system according to the present invention. The bus monitoring system includes a first monitoring device 5 installed upstream of the signal path 1 through which signals are transmitted and received by the transmission device, and a first monitoring device 5
And a second monitoring device 6 installed further downstream. In the configuration shown in FIGS. 6 and 7, the first monitoring device 5 corresponds to the configuration installed in the monitoring section B, and the second monitoring device 6 corresponds to the configuration installed in the monitoring section C. In the following description, the same items are denoted by the same reference numerals.

The first monitoring device 5 includes a monitoring bit insertion unit 21 for inserting a monitoring bit into a time slot of a main signal of the signal path 1, reads a monitoring bit from the main signal of the signal path 1, and based on the monitoring bit. A monitoring bit detector 22 for determining whether there is an abnormality in the signal path 1 downstream of the monitoring bit insertion unit 21 and a monitoring bit having a predetermined relationship with respect to the monitoring bits inserted by the monitoring bit insertion unit 21. Bit inserting unit 2 for inserting
5 is provided.

Further, the second monitoring device 6 is connected to the signal path 1
Bit detector 26 that determines whether there is an abnormality in the signal path 1 downstream of the position where the monitor bit detector 22 is installed, based on the monitor bit and the comparison bit read from the
With.

When the monitoring bit detection unit 22 determines that there is an abnormality in the signal path, the monitoring bit detection unit 22 determines the signal path from the installation position of the monitoring bit insertion unit 21 to the monitoring bit detection unit 22. A first abnormal alarm generating unit for externally displaying the alarm of the above is provided.

In addition, when the comparison bit detection unit 26 determines that there is an abnormality in the signal path, the comparison bit detection unit 26 provides an alarm for the signal path from the monitoring bit detection unit 22 to the comparison bit detection unit 26. Is externally displayed. These first or second abnormality alarm generation units are respectively provided with detection units 22 and 26.
May be an internal function.

This will be described in detail.

The first monitoring device 5 is installed in a monitoring section B which includes the connection terminal 2 as a part and may be erroneously connected. The second monitoring device 6 is installed in a monitoring section C immediately after such a monitoring section B. The section from the position where the monitoring bit insertion unit 21 is installed to the position where the monitoring bit detection unit 22 is installed is monitored by the monitoring bit detection unit 22, and the part downstream from the monitoring bit detection unit 22 is The monitoring is performed by the comparison bit detector 26 of the second monitoring device 6.

The comparison bit detection unit 26 compares the monitoring bit inserted by the monitoring bit insertion unit 21 with the comparison bit insertion unit 2
5 to monitor the signal path 1 based on the relationship with the inserted comparison bit. For example, if the monitoring bit and the comparison bit are the same, it is determined to be normal.

The monitor bit and the comparison bit are generated by a monitor bit generator. For this reason, the first monitoring bit generation unit 12 that outputs a predetermined monitoring bit to the monitoring bit insertion unit 21 to the monitoring bit insertion unit 21
1, the monitor bit detection unit 22 generates the same monitor bit as the monitor bit generated by the first monitor bit generation unit 121, and outputs the monitor bit to the monitor bit detection unit 22 and the comparison bit insertion unit 25. Output to the second
The monitoring bit generator 122 is also provided.

The advantages of the bus monitoring system according to the present embodiment will be described with reference to FIG.

In the example shown in FIG. 2, two signal paths are monitored, and since there are connection terminals 2 and 3 in the monitoring section B (F), there is a possibility of erroneous connection. Originally, the connection terminals 2 must be connected to each other in the signal path 1A.
May be connected incorrectly. The bus monitoring system also monitors such erroneous connections. Such a monitoring section is hereinafter referred to as a special monitoring section.

In the special monitoring section B, the monitoring bit insertion unit 2
By 1 the monitoring bit B1 is inserted. If the connection terminals 2 are normally connected, the monitoring bit detection unit 22
, The monitoring bit B1 is detected. However, when the connection terminals 2 and 3 are connected, the monitoring bit detection unit 2
In 2, the monitoring bit F1 is detected instead of the monitoring bit B1. When a normal monitoring bit is not detected in this way, an abnormal alarm is issued as a failure or erroneous connection of the signal path.

In order to confirm the erroneous connection as described above, a cable that may be erroneously connected includes a monitoring bit B1,
Different bit patterns such as F1 must be assigned. However, in the monitoring section A and the monitoring section C, there is no possibility of erroneous connection.
There is no problem if C1 and C1 are used together. Therefore, a versatile monitoring device that monitors the monitoring section A can be used.

In the example shown in FIG. 7, the previous section monitor bit detector 24 determines whether there is an abnormality by detecting the monitor bit B1 inserted by the monitor bit inserter 21 in the monitor section B. , Previous section monitoring bit detector 2
4 had to generate the monitoring bit B1.

When this is applied to the example shown in FIG. 2, a monitoring bit B1 is generated in the monitoring section C of the signal path 1A,
In the monitoring section C of the signal path 1B, the monitoring bit F1 must be generated. Then, in the monitoring section immediately after the special monitoring section, different monitoring bits B1 and F1 have to be generated for the preceding section monitoring. Therefore, FIG.
In the example shown in (1), the versatility of the second monitoring device installed in the monitoring section immediately after the special monitoring section is low.

On the other hand, in the present embodiment, the comparison bit detection unit 26 detects the monitoring bit and the comparison bit from the connected signal path, and monitors the signal path by comparing them. There is no need to generate different monitoring bits. For this reason, monitoring can be performed using the same monitoring device whether it is downstream of the monitoring section B or downstream of the monitoring section F.

In the monitoring section B, the monitoring bit B1 is inserted by the monitoring bit insertion unit 21 and the comparison bit B1 is inserted by the comparison bit insertion unit 25.
The comparison bit detector 26 of the signal path 1A
The presence or absence of an abnormality in the signal path 1A is determined based on 1 and the comparison bit B1.

On the other hand, in the monitoring section F, the monitoring bit F1 is inserted by the monitoring bit insertion unit 21 and the comparison bit F1 is inserted by the comparison bit insertion unit 25. Therefore, the comparison bit detection unit 26 of the signal path 1B is , The presence or absence of an abnormality in the signal path 1B is determined based on the monitoring bit F1 and the comparison bit F1.

Therefore, according to the present embodiment, since the monitoring of the signal path using the comparison bit is also used, the versatility of the second monitoring device installed in the monitoring section immediately after the special monitoring section is greatly increased. I do. Therefore, if the function of the second monitoring device is formed into an LSI, this LSI is used in a wide range of fields, and thus it is possible to use common components. In addition, since the comparison bit detection unit 26 does not require a monitoring bit generation unit, it is not necessary to generate a monitoring bit complicated for a special monitoring section, and the monitoring device can be downsized.

Next, the packaging of the bus monitoring system and the processing using the alarm suppression bit will be described.

Since a device having an enormous circuit scale has a long signal path, it is general practice to divide the package for each processing unit and use a plug-in unit configuration. In this case, each monitoring section is mainly a unit of device maintenance, that is, a package unit. Therefore, each monitoring section is divided into a package and a package.

In the example shown in FIG. 2, the monitoring section is divided into a transmitting side package, a receiving side package, and between these packages. In this case, the monitoring bit insertion unit 21 is incorporated in the transmission side package, while the previous section monitoring bit detection unit 14 and the monitoring bit detection unit 22 are incorporated in the reception side package.

The preceding section monitoring bit detector 14 always detects an abnormality because an alarm is generated when the monitoring bit detector 12 detects an abnormality. In order to prevent the propagation of the alarm, an alarm suppression bit for transmitting the occurrence of the abnormality to each detection unit on the downstream side is used.

FIGS. 3 and 4 are block diagrams showing details of the configuration connected to signal path 1A shown in FIG.
Details of the monitoring section A are the same as the configuration shown in FIG.

When the monitoring bit detectors 12 and 22 detect an abnormality, the alarm suppression bit insertion units 13 and 23 use an arbitrary fixed bit K from the monitoring bit generators 113 and 123 as an alarm suppression bit as a main signal. Insert into an empty time slot. Then, the previous section monitoring bit detection unit 1
4 detects (masks) the occurrence of an abnormal alarm in the previous monitoring section when the alarm suppression bit K is detected.

In the example shown in FIG.
Is provided with an alarm suppression bit generator 126 that generates only the alarm suppression bit K. Similarly to the previous section monitoring bit detection unit 14, the comparison bit detection unit 26 converts an arbitrary fixed bit K (alarm suppression bit) inserted by the alarm suppression bit insertion unit 23 into a fixed bit generated by the alarm suppression bit generation unit 126. Monitor with K, and if a fixed bit is detected, suppress the issuance of an alarm indicating that the previous monitoring section is abnormal (mask)
I do.

The comparison bit detection unit 26 suppresses the issuance of an alarm using the alarm suppression bit even if an abnormality is detected in the previous monitoring section. Further, the comparison bit detection unit 26 determines the state of the signal path for the monitoring section B downstream of the monitoring bit detection unit 22 based on the state of the time slot. In this state, the monitoring bit does not match the comparison bit, and the alarm suppression bit is detected. If the alarm suppression bit is detected and the monitoring bit does not match the comparison bit, the comparison bit alarm suppression bit insertion unit It is not determined that the state of the signal path after 23 is at least faulty.

For example, when the monitoring bit insertion unit 21 inserts a monitoring bit B1 and a monitoring bit obtained by inverting the monitoring bit B1 in the monitoring bit insertion unit 21, the comparison bit detection unit 26 inverts the B1 when the alarm suppression bit is detected. If the bit pattern obtained by further inverting the monitored bit B1 is compared with the comparison bit, it can be determined that no abnormality has occurred in the receiving side package. Also, the monitoring bit detected by the monitoring bit detection unit 22 is “B
If it is different from “1”, the detected monitoring bit may be inserted by the comparison bit inserting unit 25. Further, if a configuration is adopted in which an error value is inserted into an abnormal time slot portion, it is determined whether the monitoring bit generator 114 has a failure or a connection error, for example, depending on the combination of the type of the error value and the position of the time slot. I do.

Such processing in the comparison bit detecting section 26 makes it possible to clearly determine whether an abnormality has occurred between packages, that is, whether the abnormality has occurred due to a disconnection or a connection error of a cable or a problem inside the package. This is done to determine. There are various processing methods for this, as described above, but the important thing is to prevent the spread of alarms satisfactorily. For this reason, in the present embodiment, the monitoring bit detecting unit 22 An alarm suppression bit insertion unit is also provided.

In order to suppress the abnormal alarm, the comparison bit detector 26 is provided with an alarm suppression bit generator 126. Since the alarm suppression bit is a flag indicating that an abnormality has occurred, it is not necessary to use an individual bit pattern for each connection unit of the signal path. Therefore, monitoring section C
The versatility of the second monitoring device used for the above is not hindered.

When an abnormality is detected by the comparison bit detection unit 26 in a state where the propagation of the alarm is thus prevented, the maintenance target is only the receiving side package.

Further, by preventing the transmission of the alarm, the abnormality detection in the previous section monitoring bit detection section 14 is performed by the monitoring bit detection section 12 in the previous monitoring section A and the monitoring bit insertion section 21 in its own monitoring section B. Between the signal paths. Further, the failure detection of the monitoring bit detection unit 12 itself in the previous monitoring section A can be satisfactorily performed indirectly.

Next, the operation of the configuration shown in FIG. 1 will be described with reference to FIG. FIG. 5 is an explanatory diagram showing an example of a time slot of a main signal in a signal path.

For monitoring the connection of cables or the like between the packages, a human error is monitored, and since a large number of signal paths in FIG. 1 exist in the apparatus, monitoring is performed using a different monitoring bit pattern for each connection unit. If it is necessary to do so, a bit pattern is defined for the monitoring bits B1 used between the packages based on a unified ID or the like in the device.

First, the monitor bit generator 11 generates the monitor bit A1, and the monitor bit inserter 11 inserts the monitor bit A1 (11a) into the time slot W. Then, the time slot becomes as shown in FIG.

Next, the monitor bit detector 12 detects the monitor bit (11a) from the time slot W and compares it with the monitor bit generated by the monitor bit generator 112. Here, since both are “A1” and coincide with each other, the alarm suppression bit insertion unit 13 does not suppress the alarm suppression bit. If they do not match, an alarm suppression bit K (13a) is inserted into the time slot Y as shown.

Next, the monitoring bit insertion unit 21 inserts the monitoring bit B1 into the time slot X (21a).

Further, the preceding section monitoring bit detection section 14
The monitoring bit (11a) is detected from the time slot W,
This monitor bit is compared with the monitor bit generated by the monitor bit generator 114. Here, since they match, it becomes clear that the monitoring section A is normal.

The monitor bit detector 22 detects the monitor bit (21a) from the time slot X and compares it with the monitor bit generated by the monitor bit generator 122.
If they do not match, it is determined that the packages are abnormal due to disconnection or incorrect connection. Then, the alarm suppression bit insertion unit 2
3 inserts the alarm suppression bit K into the time slot Y. Here, since the monitoring bit B1 is detected from the time slot X, the part is determined to be normal.

Further, in the present embodiment, the comparison bit insertion unit 25 inserts the monitoring bit generated by the monitoring bit generation unit 122 into the time slot Z (25a).

The preceding section monitoring bit detector 24 shown in FIG.
Is changed to the comparison bit detection unit 26 in the present embodiment. The comparison bit detection unit 26 includes the monitoring bit insertion unit 2
1 and the fixed bit inserted in comparison bit 2
5 is compared and detected with the arbitrary fixed bit inserted. Thus, it is possible to monitor the signal path in the package in the monitoring section B without the need for the monitoring bit generator 124.

Further, the monitoring bit insertion unit 31 inserts the monitoring bit C1 into the time slot W (31a). Such processing is performed for each connection unit of the signal path.

As described above, according to the present embodiment, the generation of the monitoring bit pattern B1 is changed from the conventional monitoring bit generation unit to the alarm suppression bit generation unit, thereby eliminating the generation circuit of the monitoring bit pattern B1. A method of providing a conventional monitoring capability by generating only a uniquely generated monitoring bit pattern B2 is realized.

[0081]

Since the present invention is constructed and functions as described above, according to this, in addition to the monitoring bit insertion and detection (the first monitoring device) at the start and end points of each monitoring section,
At the end point of the next monitoring section, the same monitoring bit is detected again (second
Monitoring device), the unmonitored section on the signal path can be eliminated, and the second monitoring device monitors only the connection between the monitoring sections. Since the comparison bit detection unit of the second monitoring device performs the connection monitoring by comparing and detecting, the versatility of the second monitoring device can be prevented from being reduced, and the generation circuit (monitoring circuit) that generates a complicated monitoring bit pattern By eliminating the bit generation unit), the circuit scale of an LSI or the like including the second monitoring device can be reduced. In this way, even if individual monitoring bits are assigned to each connection unit in order to monitor a signal path in which an erroneous connection may occur, the total number of monitoring bit generators specialized for the device can be reduced, and further, This makes it possible to provide an unprecedented excellent bus monitoring system that can provide an unprecedented bus monitoring system that can enhance versatility.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram showing an example in which the monitoring device shown in FIG. 1 is applied to a signal path in which an erroneous connection may occur.

FIG. 3 is a block diagram showing details of a first monitoring device shown in FIG. 1;

FIG. 4 is a block diagram illustrating details of a second monitoring device illustrated in FIG. 1;

FIG. 5 is an explanatory diagram showing an example of a time slot of a main signal shown in FIG. 1; FIG. 5 (a) is a diagram showing a state in which a monitoring bit is inserted into a time slot W; )
FIG. 5 is a diagram showing a state in which an alarm suppression bit is inserted in a time slot Y, and FIG. 5C is a diagram showing a state in which a monitoring bit is inserted in a time slot Z.

FIG. 6 is a block diagram illustrating an upstream configuration of a comparative example of the present embodiment.

FIG. 7 is a block diagram showing a configuration on the downstream side of the comparative example shown in FIG. 6;

[Description of Signs] 1 signal path 2 connection terminal (connector) 5 first monitoring device (configuration for special monitoring section) 6 second monitoring device (configuration for monitoring section immediately after special monitoring section) 11, 21, 31 Monitoring bit insertion unit 12, 22, 32 Monitoring bit detection unit 13, 23, 33 Alarm suppression bit insertion unit 25 Comparison bit insertion unit 26 Comparison bit detection unit

Claims (5)

(57) [Claims] A first monitoring device installed upstream of a signal path through which a signal is transmitted and received by an electric transmission device;
A second monitoring device installed in a signal path downstream of a position where the monitoring device is installed, wherein the first monitoring device inserts a monitoring bit into a main signal of the signal path. An insertion unit, a monitoring bit detection unit that reads a monitoring bit from a main signal of the signal path and determines whether there is an abnormality in a signal path downstream of the monitoring bit insertion unit based on the monitoring bit, and the monitoring bit A comparison bit insertion unit for inserting a monitoring bit having a predetermined relationship with the monitoring bit inserted by the insertion unit into the signal path, wherein the second monitoring device reads out the monitoring bit read from the signal path. A comparison bit detection unit that determines whether there is an abnormality in a signal path downstream of the position where the monitoring bit detection unit is installed based on the bit and the comparison bit. Rubasu monitoring system. 2. The method according to claim 1, wherein the monitoring bit detection unit determines a signal path from the installation position of the monitoring bit insertion unit to the monitoring bit detection unit when the monitoring bit detection unit determines that there is an abnormality in the signal path. A first abnormality alarm generation unit for externally displaying an alarm; a comparison bit detection unit, wherein when the comparison bit detection unit determines that there is an abnormality in the signal path, the monitoring bit detection unit outputs the comparison bit. 2. The bus monitoring system according to claim 1, further comprising a second abnormality alarm generation unit for externally displaying an alarm on a signal path to the detection unit. 3. The monitoring bit insertion unit is installed on an upstream side of one of the connection terminals of the parallel cable having connection terminals in the signal path. A monitor bit generator that generates a monitor bit defined in advance according to the number of cables and outputs the monitor bit to the monitor bit insertion unit is provided, and the monitor bit detector is connected to a connection terminal of the cable. 3. The bus monitoring system according to claim 1, wherein the bus monitoring system is installed on a downstream side. 4. The monitoring bit insertion unit further includes a first monitoring bit generation unit that outputs a predetermined monitoring bit to the monitoring bit insertion unit. The monitoring bit detection unit includes a first monitoring bit generation unit. A second monitor bit generator for generating the same monitor bit as the monitor bit generated by the bit generator and outputting the monitor bit to the monitor bit detector and the comparison bit inserter. The bus monitoring system according to claim 1, wherein 5. An alarm suppression bit insertion unit for inserting an alarm suppression bit into a main signal of the signal path when the monitor bit detection unit determines that the signal path is abnormal. A mask function for suppressing the occurrence of an abnormal alarm from the monitoring bit insertion unit to the monitoring bit detection unit when the comparison bit detection unit reads an alarm suppression bit from the main signal of the signal path. 3. The bus monitoring system according to claim 2, wherein: