CN112804113A - Fault judgment method and system - Google Patents
Fault judgment method and system Download PDFInfo
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- CN112804113A CN112804113A CN202110403008.2A CN202110403008A CN112804113A CN 112804113 A CN112804113 A CN 112804113A CN 202110403008 A CN202110403008 A CN 202110403008A CN 112804113 A CN112804113 A CN 112804113A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0695—Management of faults, events, alarms or notifications the faulty arrangement being the maintenance, administration or management system
Abstract
The invention relates to a fault judgment method and a system, which can judge the cause of system fault according to the connection state of two devices and other devices when the two devices are disconnected. The method comprises the following steps: after the first device is disconnected from the second device, determining a first number of active connections and/or inactive connections of the first device with other devices; or determining a first ratio of active connections and/or inactive connections to total connections of the first device to the other devices; and judging the fault reason of the equipment according to the first quantity or the first proportion. The system comprises: the acquisition module is used for acquiring disconnection information of the first equipment and the second equipment; and the diagnosis module is used for judging the equipment fault reason according to the judgment method. The method and the system for judging the fault determine the reason of the system fault through the connection state of each device.
Description
Technical Field
The invention belongs to the technical field of system fault judgment methods, and particularly relates to a fault judgment method and a system.
Background
With the development and upgrade of the information-oriented industry of high-speed railways in recent years, the data volume of railway signal systems becomes huge, various systems have numerous interfaces, information interaction is frequent, and the stability of communication among the systems is very important. Once a communication fault occurs, operation and maintenance personnel are required to search and analyze the fault reason and recover a channel at the first time, so that the service hidden trouble caused by data loss is reduced. Therefore, how to use the informatization technology to assist the operation and maintenance personnel to analyze the interruption problem is an important issue currently faced by many manufacturers.
The channels between railway signal systems are generally divided into three categories: network channel, serial port channel and CAN channel. The existing railway operation and maintenance system such as a signal centralized monitoring system and various maintenance machine systems can monitor the data flow information of the system and other systems at regular time, and when the heartbeat or data packet information is not received for a period of time, the two parties are considered to be disconnected and displayed to a user in an alarm information mode. However, the current solutions only stay informed and do not perform further analysis, i.e. the alarm does not give any guidance to the user, and a professional is required to perform problem judgment remotely or on site.
At present, a signal centralized monitoring system and various maintenance machine systems can alarm disconnection information among the systems, but due to limited information, fault reasons cannot be further analyzed, further judgment cannot be performed on communication fault alarm, a responsible party cannot be confirmed, operation and maintenance personnel need to perform problem location according to experience to the site, and labor cost is increased.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method and a system for determining a cause of a system fault according to a connection state between devices.
A method of fault determination, the method comprising:
after the first device is disconnected from the second device, determining a first number of active connections and/or inactive connections of the first device with other devices; or determining a first ratio of active connections and/or inactive connections to total connections of the first device to the other devices;
and judging the fault reason of the equipment according to the first quantity or the first proportion.
Further, when the first number or the first ratio is larger than a first threshold, determining a second number of effective connections and/or non-effective connections of the second device with other devices; or determining a second ratio of active connections and/or inactive connections to full connections of the second device to the other devices;
and judging the fault reason of the equipment according to the second quantity or the second proportion.
Further, when the second number or the second ratio is greater than a second threshold, it is determined that the failure cause is a failure in a channel between the first device and the second device; or the like, or, alternatively,
and when the second quantity or the second proportion is not greater than a second threshold value, judging that the failure reason is that the second equipment fails.
Further, when the first number or the first ratio is not greater than a first threshold, determining a second number of active connections and/or inactive connections of the second device with other devices; or determining a second ratio of active connections and/or inactive connections to full connections of the second device to the other devices;
and judging the fault reason of the equipment according to the second quantity or the second proportion.
Further, when the second quantity or the second proportion is not greater than a second threshold value, it is determined that the failure reason is that both the first device and the second device have a failure; or the like, or, alternatively,
and when the second quantity or the second proportion is larger than a second threshold value, judging that the failure reason is that the first equipment fails.
The present invention also provides a fault determining system, which includes:
the acquisition module is used for acquiring disconnection information of the first equipment and the second equipment;
the diagnostic module is used for determining a first number of effective connections and/or ineffective connections between the first equipment and other equipment after the first equipment is disconnected from the second equipment; or determining a first ratio of active connections and/or inactive connections to total connections of the first device to the other devices; and judging the reason of the equipment fault according to the first quantity or the first proportion.
Further, the diagnostic module determines a second number of active connections and/or inactive connections of the second device to other devices when the first number or first ratio is greater than a first threshold; or determining a second ratio of active connections and/or inactive connections to full connections of the second device to the other devices; and judging the reason of the equipment fault according to the second quantity or the second proportion.
Further, when the second number or the second ratio is greater than a second threshold, the diagnostic module determines that the failure cause is a failure of a channel between the first device and the second device; or the like, or, alternatively,
when the second number or the second ratio is not greater than a second threshold, the diagnostic module determines that the cause of the failure is a failure of the second device.
Further, the diagnostic module determines a second number of active connections and/or inactive connections of the second device to other devices when the first number or the first ratio is not greater than a first threshold; or determining a second ratio of active connections and/or inactive connections to full connections of the second device to the other devices; and judging the reason of the equipment fault according to the second quantity or the second proportion.
Further, when the second quantity or the second proportion is not greater than a second threshold, the diagnosis module determines that the failure reason is that both the first device and the second device have a failure; or the like, or, alternatively,
when the second number or the second ratio is greater than a second threshold, the diagnostic module determines that the cause of the failure is that the first device is malfunctioning.
The present invention also provides a signalling system comprising a plurality of devices, wherein one or more of the plurality of devices are as described above.
The invention provides a fault judgment method and a fault judgment system, which can judge the cause of system fault according to the connection state of two devices and other devices when the two devices are disconnected. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 illustrates a failure determination system architecture diagram according to an embodiment of the present invention;
FIG. 2 shows a flow chart of a method of fault determination according to an embodiment of the invention;
FIG. 3 illustrates a railway signaling system connection state diagram according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a fault judgment method and a fault judgment system, which determine the cause of system fault through the connection state of each device. The embodiment of the present invention is exemplified by a railway signal system, but the present invention is not limited to a railway signal system, and any system having a plurality of devices may be applied to the present invention.
In railway signalling systems, numerous devices are involved, such as transponders, safety computers, surface electronic units (LEU), train control center systems (TCC), Radio Block Centers (RBC), temporary speed limit servers (TSRS) and dispatch centralized control centers (CTC). In order to realize the control of the train, different devices have a data connection relationship.
The railway signal system according to the embodiment of the present invention is exemplarily illustrated by taking several common devices as examples, and exemplarily illustrated by a computer interlocking system (CBI), a TCC, a track circuit system (ZPW), an RBC), a TSRS, and a CTC, according to a standard protocol related to train operation control, an interface connection relationship between each device is shown in table 1, and table 1 shows an interface connection state relationship between each device.
TABLE 1 intersystem connection analysis Table
As can be seen from table 1 above, CBI in railway signal systems can be connected to TCC, CTC, RBC, TCC can be connected to CBI, TSRS, CTC, RBC can be connected to CBI, CTC, TSRS can be connected to TCC, CTC, RBC, CTC can be connected to CBI, TCC. It should be noted that the embodiment of the present invention is only exemplified by the above-mentioned apparatuses, but is not limited to the above-mentioned apparatuses.
Based on the connection relationship between the respective devices and the actual connection state between the respective devices in table 1 above, a connection state matrix between the devices can be formed, as shown in the connection state matrix table between the devices in table 2 below. In table 2, 1 represents that there is an active connection between devices (i.e., a connection in a normal state), 0 represents that there is a non-active connection between devices (i.e., a connection between devices is disconnected due to a fault or the like in an active connection state), and FF represents that there is no connection between devices (i.e., it represents that there is no connection relationship between devices originally).
TABLE 2 INTER-DEVICE CONNECTION STATE MATRIX TABLE
From the above table, the connection relationship between the devices can be seen, CBI is in an effective connection state with TCC and RBC, CBI is in a non-effective connection state with CTC, CBI is not connected with TSRS and ZPW. TCC is in effective connection state with CBI, CTC and TSRS, TCC is not connected with RBC and ZPW. CTC and CBI are in effective connection state, CTC and TCC are in non-effective connection state, and CTC is not connected with TSRS, RBC and ZPW. The TSRS is in an effective connection state with TCC, CTC and RBC, and the TSRS is not connected with CBI and ZPW. RBC is in effective connection with CBI, CTC and TSRS, and RBC is not connected with TCC and ZPW. ZPW is not connected with CBI, TCC, CTC, TSRS and RBC. The connection state between the devices can be clarified by the inter-device connection state table.
For example, as shown in fig. 1, an architecture diagram of a fault determination system according to an embodiment of the present invention is shown, and as shown in fig. 1, in the embodiment of the present invention, each device that performs a train control function in a railway signal system is used as an original information layer, a fault collection and analysis device is used as a comprehensive analysis layer, and a display terminal that is displayed to a user and can receive a control instruction of an operator is used as a human-computer interaction layer.
As shown in fig. 1, the acquisition module in the integrated analysis layer may acquire connection state information of CBI, TCC, ZPW, RBC, TSRS, and CTC with each device. The connection state information indicates a connection state of a certain device with another device. Illustratively, in connection with Table 2, CBI connection status information CBI-TCC-1 indicates that the connection status of CBI and TCC is an active connection; CBI-CTC-0, which indicates that the connection state of the CBI and the CTC is non-effective connection; CBI-TSRS-FF, which means that there is no connection between CBI and TSRS.
The acquisition module can acquire the connection state of each device periodically or based on two modes of a trigger instruction. Illustratively, the acquisition module acquires the connection state information of each device according to a regular acquisition instruction input by an operator through a human-computer interaction layer; or collecting the connection state information of each device based on a collection trigger instruction input by an operator through man-machine interaction; or, the acquisition module acquires the connection state of a certain device with other devices when acquiring that the connection state of the device is a non-effective connection, for example, the acquisition module actively acquires the connection state of the CBI device with the TCC and the RBC when acquiring that the connection state of the CBI device with the CTC is a non-effective connection. It should be noted that the embodiment of the present invention is not limited to the above-mentioned collection manner, as long as the connection state information can be collected according to the fault determination. When the collection module collects that the connection state information is invalid connection, the disconnection time of the invalid connection needs to be recorded or collected.
After the collection module collects the connection state information of each device, the connection state information is sent to the diagnosis module, the fault information (alarm text description of non-effective connection between devices, the fault information is composed of alarm description and fault reason) is sent to the interface module located in the comprehensive analysis layer, and an inter-device connection state matrix table shown in table 2 can be formed and stored in the database for other devices to call. Illustratively, the database table structure is as follows:
/*==============================================================*/
/* Table: ConnectInfo */
/*==============================================================*/
create table ConnectInfo (
TeleName char(4) not null,
Source integer not null,
Object integer not null,
Reason integer not null,
StartTime integer not null,
constraint PK_CONNECTINFO primary key (TeleName, Source, Object, StartTime)
);
wherein: TeleName represents station telegraph code
Source A System 1.CBI 2.TCC 3.ZPW 4.RBC 5.TSRS 6.CTC
Object B System 1.CBI 2.TCC 3.ZPW 4.RBC 5.TSRS 6.CTC
Reason disconnect cause 1. system a fault 2. system B fault 3, A, B all faults 4. channel fault
StartTime off time
The connection state information of the CBI, TCC, ZPW, RBC, TSRS and CTC equipment and other equipment acquired by the acquisition module and an inter-equipment connection state matrix table formed in the acquisition module. When the acquisition module receives the non-effective connection between the devices, the connection state between the devices is sent to a diagnosis module positioned in the comprehensive analysis layer, the diagnosis module can receive the connection state information of the CBI, TCC, ZPW, RBC, TSRS and CTC devices and other devices acquired by the acquisition module and an inter-device connection state matrix table formed in the acquisition module, and then the fault reason of the system is judged according to the comparison result of the connection number or proportion of the devices and a threshold value, and the fault reason is sent to the interface module. The interface module is used for receiving the fault information sent by the acquisition module and the fault reason sent by the diagnosis module. The interface module combines the received fault information and fault reasons to serve as alarm information to be sent to a display terminal located on a man-machine interaction layer, the display terminal sends the fault information and the fault reasons among the systems to maintenance personnel in a sound-light alarm or short message prompt mode after receiving the alarm information, and the maintenance personnel pertinently process the faults after receiving the alarm prompt.
For example, the CBI device and the CTC device are taken as an example for illustration, but the invention is not limited to the CBI device and the CTC device, and any system failure determination with multiple devices can be applied to the invention. Referring to fig. 2, fig. 2 is a flow chart of a fault determination method according to an embodiment of the present invention, where P is1Represents a first threshold value, P2Representing a second threshold, the method comprising:
after the acquisition module acquires the non-effective connection state information of the CBI equipment and the CTC equipment, the effective connection of the CBI equipment and other equipment is determinedThe number of the joints; determining the ratio of the effective connection and the total connection of the CBI equipment and other equipment according to the effective connection quantity; when the ratio of the effective connection to the total connection of the CBI equipment and other equipment is more than P1Determining the effective connection number of the CTC equipment and other equipment; determining the ratio of the effective connection and the total connection of the CTC equipment and other equipment according to the effective connection number; when the ratio of the effective connection to the total connection of the CTC equipment and other equipment is more than P2If so, judging that the failure reason is that the channel between the CBI equipment and the CTC equipment fails; when the ratio of the effective connection to the total connection of the CTC equipment and other equipment is not more than P2And if so, determining that the cause of the failure is the failure of the CTC device.
When the ratio of the effective connection to the total connection of the CBI device and other devices is not more than P1Determining the effective connection number of the CTC equipment and other equipment; determining the effective connection ratio of the CTC equipment and other equipment according to the effective connection quantity; when the ratio of the effective connection of the CTC equipment and other equipment is not more than P2Judging that the failure reason is that both the CBI equipment and the CTC equipment have failure; or, when the ratio of the CTC device to other devices is greater than P2And judging that the failure reason is that the CBI equipment fails.
The fault diagnosis method of the present invention is exemplarily explained as follows, as shown in fig. 3, fig. 3 shows a railway signal system connection state diagram according to an embodiment of the present invention; the acquisition module acquires that the CBI equipment and the TCC equipment are in a non-effective connection state, the CBI equipment and the RBC equipment are in a non-effective connection state, and the CBI equipment and the CTC equipment are in an effective connection state, namely the number of the CBI equipment in effective connection with other equipment is 1, and the number of the CBI equipment in non-effective connection with other equipment is 2; or the ratio of the effective connection to the total connection of the CBI device and other devices is 0.33, and the ratio of the ineffective connection to the total connection of the CBI device and other devices is 0.67;
judging according to the effective connection proportion, setting the first threshold value to be 0.2 according to user experience, and setting the proportion of the effective connection and the total connection of the CBI equipment and other equipment to be 0.33, namely, the proportion of the effective connection and the total connection of the CBI equipment and other equipment is greater than the first threshold value of 0.2, or judging according to the ineffective connection proportion, setting the first threshold value to be 0.8 according to the user experience, and setting the proportion of the ineffective connection and the total connection of the CBI equipment and other equipment to be 0.67, namely, the proportion of the ineffective connection and the total connection of the CBI equipment and other equipment to be less than the first threshold value of 0.8;
further determining the connection state information of the CTC equipment and other equipment, wherein the CTC equipment and the TCC equipment are in an effective connection state, the CTC equipment and the CBI equipment are in an effective connection state, the CTC equipment and the RBC equipment are in an effective connection state, the CTC equipment and the TSRS equipment are in an effective connection state, namely the number of effective connections of the CTC equipment and other equipment is 4, and the number of non-effective connections of the CTC equipment and other equipment is 0; or, the ratio of active connections to full connections of the CTC device to other devices is 1, and the ratio of inactive connections to full connections of the CTC device to other devices is 0;
and judging according to the effective connection ratio, setting the second threshold value to be 0.5 according to user experience, wherein the ratio of the effective connection to all the connections of the CTC device and other devices is 1, namely the ratio of the effective connection to all the connections of the CTC device and other devices is greater than the second threshold value of 0.5, or judging according to the non-effective connection ratio, setting the second threshold value to be 0.5 according to the user experience, and setting the ratio of the non-effective connection to all the connections of the CTC device and other devices to be 0, namely the ratio of the non-effective connection to all the connections of the CTC device and other devices to be less than the second threshold value of 0.5, and judging that the failure reason is that a channel between the CBI device and the CTC.
Or, judging according to the effective connection ratio, setting the first threshold to be 0.4 according to user experience, and setting the ratio of the effective connection to the total connection of the CBI device and other devices to be 0.33, namely, the ratio of the effective connection to the total connection of the CBI device and other devices is smaller than the first threshold of 0.4, or judging according to the ineffective connection ratio, setting the first threshold to be 0.6 according to user experience, and setting the ratio of the ineffective connection to the total connection of the CBI device and other devices to be 0.67, namely, the ratio of the ineffective connection to the total connection of the CBI device and other devices is larger than the first threshold of 0.6;
and setting the second threshold value to be 0.6 according to user experience, wherein the ratio of the effective connection to the total connection of the CTC device and the other devices is 1, namely the ratio of the effective connection to the total connection of the CTC device and the other devices is greater than the second threshold value of 0.6, or judging according to the ratio of the ineffective connection, setting the second threshold value to be 0.4 according to the user experience, and setting the ratio of the ineffective connection to the total connection of the CTC device and the other devices to be 0, namely the ratio of the ineffective connection to the total connection of the CTC device and the other devices to be less than the second threshold value of 0.4, and judging that the failure cause is the failure of the CBI device.
Or, judging according to the number of effective connections, setting the first threshold to be 1 according to user experience, and setting the number of effective connections between the CBI device and other devices to be 1, that is, the number of effective connections between the CBI device and other devices is not greater than the first threshold 1, or judging according to the number of ineffective connections, setting the first threshold to be 2 according to user experience, and setting the number of ineffective connections between the CBI device and other devices to be 2, that is, the number of ineffective connections between the CBI device and other devices is not less than the first threshold 2;
and then setting the second threshold value to be 2 according to the user experience, wherein the number of the effective connections between the CTC device and other devices is 4, namely the number of the effective connections between the CTC device and other devices is greater than the second threshold value 2, or judging according to the number of the ineffective connections, setting the second threshold value to be 2 according to the user experience, and setting the number of the ineffective connections between the CTC device and other devices to be 0, namely the number of the ineffective connections between the CTC device and other devices is less than the second threshold value 2, and then judging that the failure reason is that the CBI device fails.
In the embodiment of the present invention, the first device and the second device do not indicate devices in a sequential order, but only indicate any two devices in the entire devices; the first number refers to the number of effective connections and/or ineffective connections of the first device with other devices; the second number refers to the number of active connections and/or inactive connections of the second device to other devices; the first proportion refers to the proportion of the first device to other devices which are effectively connected and/or not effectively connected to all the devices; the second ratio refers to the ratio of the second device to other devices that are operatively connected and/or non-operatively connected to all connections.
In the embodiment of the present invention, a connection refers to a relationship between two or more devices having data transmission, and includes an active connection and a non-active connection. The effective connection means that the connection between two or more devices is normal, and data transmission can be performed, but does not necessarily indicate that data transmission is performed between the devices; the non-active connection means that two or more devices are connected to each other, but normal data transmission cannot be performed due to a failure.
In the embodiment of the present invention, the first threshold and the second threshold do not indicate systems in a sequential order, but only indicate thresholds corresponding to any first system and second system in the entire system; the first threshold and the second threshold are set according to user experience, and the setting of the thresholds can be adjustable and is a dynamic threshold.
In the embodiment of the present invention, the channel refers to a medium for transmitting data between systems, and includes a wired channel (e.g., an optical fiber, a cable), a wireless channel (e.g., a wireless channel, an infrared ray), and the like.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1.A method of fault determination, the method comprising:
after the first device is disconnected from the second device, determining a first number of active connections and/or inactive connections of the first device with other devices; or determining a first ratio of active connections and/or inactive connections to total connections of the first device to the other devices;
and judging the fault reason of the equipment according to the first quantity or the first proportion.
2. The failure judgment method according to claim 1,
when the first number or the first ratio is larger than a first threshold value, determining a second number of effective connections and/or non-effective connections between the second equipment and other equipment; or determining a second ratio of active connections and/or inactive connections to full connections of the second device to the other devices;
and judging the fault reason of the equipment according to the second quantity or the second proportion.
3. The failure judgment method according to claim 2,
when the second quantity or the second proportion is larger than a second threshold value, judging that the failure reason is that a channel between the first equipment and the second equipment fails; or the like, or, alternatively,
and when the second quantity or the second proportion is not greater than a second threshold value, judging that the failure reason is that the second equipment fails.
4. The failure judgment method according to claim 1,
when the first number or the first ratio is not greater than a first threshold value, determining a second number of active connections and/or inactive connections of the second device with other devices; or determining a second ratio of active connections and/or inactive connections to full connections of the second device to the other devices;
and judging the fault reason of the equipment according to the second quantity or the second proportion.
5. The failure judgment method according to claim 4,
when the second quantity or the second proportion is not greater than a second threshold value, judging that the failure reason is that both the first equipment and the second equipment have failures; or the like, or, alternatively,
and when the second quantity or the second proportion is larger than a second threshold value, judging that the failure reason is that the first equipment fails.
6. A fault determination system, the system comprising:
the acquisition module is used for acquiring disconnection information of the first equipment and the second equipment;
the diagnostic module is used for determining a first number of effective connections and/or ineffective connections between the first equipment and other equipment after the first equipment is disconnected from the second equipment; or determining a first ratio of active connections and/or inactive connections to total connections of the first device to the other devices; and judging the reason of the equipment fault according to the first quantity or the first proportion.
7. The failure determination system according to claim 6,
when the first number or the first ratio is greater than a first threshold, the diagnostic module determines a second number of active connections and/or inactive connections of the second device with other devices; or determining a second ratio of active connections and/or inactive connections to full connections of the second device to the other devices; and judging the reason of the equipment fault according to the second quantity or the second proportion.
8. The failure determination system according to claim 7,
when the second quantity or the second proportion is larger than a second threshold value, the diagnosis module judges that the fault reason is that a channel between the first equipment and the second equipment has a fault; or the like, or, alternatively,
when the second number or the second ratio is not greater than a second threshold, the diagnostic module determines that the cause of the failure is a failure of the second device.
9. The failure determination system according to claim 6,
when the first number or the first ratio is not greater than a first threshold, the diagnostic module determines a second number of active connections and/or inactive connections of the second device with other devices; or determining a second ratio of active connections and/or inactive connections to full connections of the second device to the other devices; and judging the reason of the equipment fault according to the second quantity or the second proportion.
10. The failure determination system according to claim 9,
when the second quantity or the second proportion is not larger than a second threshold value, the diagnosis module judges that the failure reason is that the first equipment and the second equipment both have failures; or the like, or, alternatively,
when the second number or the second ratio is greater than a second threshold, the diagnostic module determines that the cause of the failure is that the first device is malfunctioning.
11. A signalling system comprising a plurality of devices, wherein one or more of the plurality of devices is the first device or the second device as claimed in any one of claims 6 to 10.
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| US6680903B1 (en) * | 1998-07-10 | 2004-01-20 | Matsushita Electric Industrial Co., Ltd. | Network system, network terminal, and method for specifying location of failure in network system |
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Application publication date: 20210514 |