JP2010245589A - Communication system, communication device, method for specifying suspect portion, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that it takes much time to specify a suspect portion when interference occurs. <P>SOLUTION: In a communication system for connecting a plurality of communication devices via a line, a communication device which has detected a fault is a master device 101 and a communication device opposing the master device is a slave device 102, the master device 101 sorts as to whether an interference source is a transmission side or a reception side of a master device or a slave device based on a measurement result of the transmission reception level of the own device and a measurement result acquired from the slave set by a measurement request of the transmission reception level to the slave set 102, sorts as to whether a failure source is the inside or outside of the own device and the slave device based on a diagnosis of an inner line of its own device and a diagnosis acquired from the slave device 102 by a request of diagnosing an inner line to the slave set 102, and specifies a suspect portion based on a result of sorting of the transmission side and the reception side of the master set or the slave set, and a result of sorting of the inside and outside of the device. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a communication system that connects a plurality of communication devices via a line, and more particularly to a communication system, a communication device, a method for identifying a suspected location, and a program that automatically identify a suspected location when a failure occurs.

  When a failure occurs in an optical line port of a communication device such as a switch or a router, link down or frame discard occurs. In this case, there are a plurality of places (probable places) where it is considered that a failure has occurred, and the backplane, the target port of the interface card, the optical module, the optical cable, etc. of the own apparatus and the opposite apparatus are considered as the suspected places. In order to identify the suspected part, it is necessary to stop communication during operation and perform optical level measurement and line diagnosis by maintenance personnel.

  For example, when a failure occurs in a Gigabit Ethernet (line speed: 1 Gbps) line widely installed in communication devices such as switches and routers, as a method of isolating (identifying) the suspected part, replace the parts in order. If the failure source is its own device or other device, it is transmitted by measuring the line light level with the optical multimeter or by stopping the communication during operation and performing the internal line diagnosis of the interface module.・ A method is used to determine whether or not it is the receiving side.

  FIG. 6 shows a method for identifying a suspected place when a line failure such as link down or error frame reception occurs on a line in a communication system in which communication devices 1 and 2 such as switches and routers are connected via an optical line. In FIG. 6, communication apparatuses 1 and 2 are respectively CPUs 11 and 41 that are central processing control units, interface cards 13 and 43, PHY / MAC (Physical layer / Media) that controls a media access control layer and a physical layer part. Access Control layer (physical layer / media access control layer) devices 14 to 17 and 44 to 47 and optical modules 18 to 21 and 48 to 51 are provided.

  When a line failure such as link down or error frame reception occurs on the line, the normality is confirmed by closing the operation line and measuring the optical output level with the optical multimeter 3 as shown in FIG. ing. Furthermore, when specifying whether the suspicious part is the outside of the device (optical module) or the inside of the device (interface card and backplane), the internal line diagnosis of the communication path is performed by turning back the PHY / MAC device by manual control. It is specified by that.

  For this reason, in order to identify the suspected part, it is very inefficient because it requires a separation time and replacement parts, and when performing line diagnosis, maintenance personnel must operate the corresponding device. Further, in the case of suspicious part isolation by parts replacement, it takes time to recover, so that failure may occur again before replacement, and link down and frame discard may occur.

  For example, Patent Literature 1 and Patent Literature 2 disclose related technologies related to the identification of a suspected place.

  Patent Document 1 discloses a technique for identifying a suspected place by performing a diagnosis centering on a light reception level in a communication device when a communication failure occurs. Patent Document 2 discloses a technique for identifying a suspected place by sequentially processing terminal diagnosis / line diagnosis and diagnosis of another device.

JP 2006-352484 A

JP 04-291850 A

  As described above, there is the following problem in the categorization of suspected places by the related techniques described in Patent Document 1, Patent Document 2, and the like.

  When determining whether the failure source is the transmission side or reception side of the line, it is necessary to manually check by connecting an optical multimeter, etc., and when determining whether the failure source is inside the device or outside the device, Since it is necessary to perform internal line diagnosis manually by maintenance personnel, it is very inefficient and it takes time to identify the suspected part.

  In addition, since it takes time to identify the suspected place, useful information cannot be obtained in the case of automatic recovery as time elapses, and the time until the suspected place is separated is further prolonged.

(Object of invention)
The object of the present invention is to identify the suspected part at an early stage by automating the identification of the suspected part by measuring the transmission / reception level between the own apparatus and the opposite apparatus and the isolating of the suspected part by the internal line diagnosis at the time of failure It is to provide a communication system, a communication device, a method for identifying a suspected place, and a program.

  A communication system according to the present invention is a communication system in which a plurality of communication devices are connected via a line. A communication device that detects a failure is a master device, a communication device opposite to the master device is a slave device, and the master device is the own device. Based on the measurement result of the transmission / reception level of the slave device and the measurement result acquired from the slave device by the transmission / reception level measurement request to the slave device, the failure source is classified as the transmission side or the reception side of the master device or slave device. Based on the internal line diagnosis result of the device and the diagnosis result acquired from the slave device by the internal line diagnosis request to the slave device, it is determined whether the failure source is inside or outside of the own device and the slave device. , In the separation result of the transmission side and the reception side of the master device or slave device, and the separation result inside and outside the device Perform a specific problem area in Zui.

  The communication device according to the present invention, in a communication device connected to a plurality of communication devices via a line, causes a communication device that detects a failure to function as a master device, and an opposing communication device as a slave device. Based on the measurement result of the transmission / reception level and the measurement result acquired from the slave device by the transmission / reception level measurement request to the slave device, the failure source is classified as the transmission side or reception side of the master device or slave device, and the own device Based on the internal line diagnosis result and the diagnosis result obtained from the slave device by the request for internal line diagnosis to the slave device, the failure source is determined to be inside or outside the device of the own device and the slave device, Based on the separation results of the master device or slave device on the transmission side and the reception side, and the separation results inside and outside the device Doubt perform a particular location.

  A method for identifying a suspected location according to the present invention is a method for identifying a suspected location in a communication system in which a plurality of communication devices are connected via a line, and the communication device that detects a failure is a master device, and communication between the master device and the opposite device. The device is a slave device, and on the master device, the failure source is the master device or the slave device based on the measurement result of the transmission / reception level of the own device and the measurement result acquired from the slave device by the transmission / reception level measurement request to the slave device. Based on the step of determining whether it is the transmission side or the reception side, the internal line diagnosis result of the own device, and the diagnosis result obtained from the slave device by the request for the internal line diagnosis to the slave device, the failure source is the own device and the slave A step of determining whether the device is inside or outside the device, and the transmission side and reception side of the master device or slave device Divided and results Ri, it performs the step of performing a specific problem area, based on the device inside and outside the apparatus cut results.

  A program according to the present invention is a program that operates on a communication device connected to a plurality of communication devices via a line and identifies a suspected place. The communication device functions as a slave device, and based on the measurement result of the transmission / reception level of the own device and the measurement result acquired from the slave device by the transmission / reception level measurement request to the slave device, the failure source is the master device or Based on the processing to determine whether the slave device is transmitting side or receiving side, the internal line diagnosis result of its own device, and the diagnostic result obtained from the slave device by the request for internal line diagnosis to the slave device, The process of determining whether the device and slave device are inside or outside the device, and the transmission side and reception side of the master device or slave device And isolation results side, a process for performing a specific problem area, based on the device inside and outside the apparatus cut results to execute.

  According to the present invention, at the same time as the failure occurs, the suspected part is automatically identified by measuring the transmission / reception level between the own apparatus and the opposite apparatus, and the suspected part is identified by the internal line diagnosis, and the suspected part is identified early. be able to.

It is a block diagram which shows the structural example of the communication system by the 1st Embodiment of this invention. It is a flowchart explaining the separation process in the 1st Embodiment of this invention. It is a timing chart which shows the flow of processing between the master apparatus in the 1st Embodiment of this invention, and a slave apparatus. It is a figure which shows the format of the packet for the transmission / reception optical level measurement request | requirement and transmission / reception optical level notification in the 1st Embodiment of this invention. It is a figure which shows the format of the internal line diagnostic request | requirement and notification packet in the 1st Embodiment of this invention. It is a figure which shows the example of the isolation | separation method of a suspected location in related technology.

  FIG. 1 shows a configuration example of a system that performs automatic isolation in the event of a line failure according to the first embodiment of the present invention.

  In the first embodiment, a device that detects a line failure is a master device 101, and the opposite device is a slave device 102. In the CPU (Central Processing Unit) 111 of the master device 101, the suspected part is separated. To implement.

  As the master device 101 and the slave device 102 shown in FIG. 1, communication devices (for example, a switch equipped with an optical module, and the like that are connected to each other via a network constituted by a line such as Gigabit Ethernet (line speed: 1 Gbps) Communication devices such as routers).

  As shown in FIG. 1, the master device 101 and the slave device 102 are CPUs 111 and 141 that are central processing control units, interface cards 113 and 143, PHY / MAC (Physical layer) that controls the media access control layer and the physical layer part. / Media Access Control layer (physical layer / media access control layer) devices 114 to 117 and 144 to 147, and optical modules (communication modules) 118 to 121 and 148 to 151 having a function of measuring transmitted and received optical levels, packet processing It is a device such as a switch or a router that communicates with other slots via a functional unit and a backplane having N device slots.

  Between the CPUs 111 and 141 and the optical modules 118 to 121 and 148 to 151 and the PHY / MAC devices 114 to 117 and 144 to 147, an optical signal level measurement request and the result reception, link down, and error frame detection information communication are performed. Control buses 132 and 162 to be performed, and data buses 131 and 161 that are packet communication paths between the CPUs 111 and 141 and the packet processing function units 112 and 142 are provided.

  In addition, as redundancy of the communication path between the master apparatus 101 and the slave apparatus 102, the redundancy via the redundant communication path 173 using the LAG (Link Aggregation) function 103 and the separate network 104 for the port 1 and the port 2 A communication path 174 is provided.

  The PHY / MAC devices 114 to 117 and 144 to 147 have internal loopback functions 133 and 163 in the device for internal line diagnosis. The internal loopback functions 133 and 163 are functions for looping back the packets received from the packet processing function units 112 and 142 within the device.

  The optical modules 118 to 121 and 148 to 151 have a function of measuring a light reception level and a function of measuring a transmission light level. The transmission light level can be measured by a transmission light feedback process. The optical modules 118 to 121 and 148 to 151 measure the transmitted and received light levels under the control of the CPUs 111 and 141 and notify the CPUs 111 and 141 of the measurement results.

  Based on the reception results from the optical modules 118 to 121 and 148 to 151 and the PHY / MAC devices 114 to 117 and 144 to 147, the CPUs 111 and 141 transmit and receive a reference value and a transmission / reception light level for each module type. The measured values are compared to determine whether the failure source is the transmission side or the reception side of the master device 101 or the slave device 102.

  In addition, the CPUs 111 and 141 have a function of automatically controlling internal line diagnosis and determining from the diagnosis result whether the failure source is inside the master device 101 and the slave device 102 or outside the device. The master device 101 or the slave device 102 has a function of combining the result of the separation on the transmission side and the reception side and the result of the separation on the inside and outside of the device and identifying the suspected place based on both results.

  Further, the CPUs 111 and 141 periodically monitor the number of error frames received from the PHY / MAC devices 114 to 117 and 144 to 147 and the link status from the optical modules 118 to 121 and 148 to 151 to determine the number of error frames or the links. It has a function of detecting a line failure based on the status.

  Further, the CPUs 111 and 141 also have a function of controlling the transmission / reception light level measurement function of the optical modules 118 to 121 and 148 to 151 and causing the optical modules 118 to 121 and 148 to 151 to perform transmission / reception light level measurement. .

  The functions of the CPUs 111 and 141 are provided by programs stored in a storage medium such as a ROM (Read Only Memory), a magnetic disk, and a semiconductor memory included in the master device 101 and the slave device 102. The CPUs 111 and 141 implement the functions described above by executing the programs.

(Operation of the first embodiment)
As an operation of the first embodiment, for an operation example when a line failure occurs in port 1 of the master device 101 in FIG. 1, a flowchart showing the isolation process in FIG. 2, between the master device and the slave device in FIG. This will be described with reference to a timing chart showing the data processing flow.

  The CPU 111 of the master device 101 identifies a suspected place by automatically executing a series of processes described below at the same time as detecting a failure.

  When a line failure occurs in port 1 of the master device 101, the CPU 111 of the master device 101 detects a link down (failure) by detecting an optical reception interruption from the opposite optical module 148 at the port 1 (step). S201).

  The CPU 111 of the master device 101 causes the optical module 118 of the port 1 to measure the transmission / reception light level (transmission side: Tx_m, reception side: Rx_m) via the control bus 132 (step S202). The level measurement result is received (step S203).

  Next, the transmission / reception light level by the optical module 148 of the port 1 which is the connection opposing port of the slave device 102 via the redundant communication paths 173 and 174 from the CPU 111 of the master device 101 to the CPU 141 of the slave device 102. Measurement (transmission side: Tx_s, reception side: Rx_s) is requested (step S204). At the time of request, for example, in the packet for transmission / reception light level measurement request and transmission / reception light level notification in the format shown in FIG. 4, the request is selected by selecting the type REQ (request) and the type corresponding to the module (optical module 148). .

  The CPU 141 of the slave device 102 that has received the measurement request from the CPU 111 of the master device 101 causes the optical module 148 to measure the transmission / reception light level via the control bus 162 from the optical module 148 of the port 1, and The measurement result is transmitted to the CPU 111 of the master apparatus 101 via the redundant communication paths 173 and 174 in the format of FIG. 4 (step S205).

  The CPU 111 of the master device 101 that has received the measurement result of the transmission / reception light level from the optical module 118 and the measurement result of the transmission / reception light level from the slave device 102 sets the received transmission / reception light level to the transmission / reception light level set for each module. Comparison is made with a reference value (minimum value and maximum value of each of the reception level and transmission level), and based on the comparison result, it is determined whether the failure source is the transmission side or reception side of the master device 101 or slave device 102 (step) S206).

  As a determination method by the CPU 111 of the master device 101 in this case, when the measured value of the transmitted / received light level is within the reference value range (within the range from the minimum value to the maximum value), it is determined to be normal and out of the reference value range. Is determined to be defective.

  The failure source is inside the device (packet processing unit 112, 142, interface card 113, 143) of the port 1 of the master device 101 and the opposite port of the slave device 102, or outside the device (optical module 118, 148). An internal line diagnosis is performed to isolate (identify the suspected part). If there is no problem in the internal line diagnosis result, the outside of the apparatus (optical modules 118 and 148) is identified as the suspected part.

  In the internal line diagnosis, the internal line diagnosis is performed between the CPU 111 of the master apparatus 101 and the PHY / MAC device 114 of the port 1 by, for example, transmitting / receiving an internal line diagnosis packet 171 having the format shown in FIG. This is performed (step S207).

  Upon receiving the internal line diagnosis packet 171 from the CPU 111, the bucket processing function unit 112, the interface card 113, and the PHY / MAC device 114 of the port 1 are internally configured based on the internal circuit diagnosis instruction indicated in the internal line diagnosis packet 171. Perform circuit diagnosis. The internal line diagnosis packet 171 including the diagnosis result is returned by the internal return function 133 of the PHY / MAC device 114 and received by the CPU 111.

  At the same time, the CPU 111 of the master device 101 makes an internal line with the packet format shown in FIG. A diagnosis request is transmitted (step S208).

  The CPU 141 of the slave device 102 that has received the internal line diagnosis request performs internal line diagnosis by transmitting / receiving an internal line diagnosis packet 172 between the PHY / MAC devices 144 of the port 1. After completion of the diagnosis, the CPU 141 incorporates the diagnosis result in the internal line diagnosis packet 172 having the packet format shown in FIG. 5, and notifies the internal line diagnosis packet 172 to the CPU 111 of the master apparatus 101 (step S209).

  Based on the internal line diagnosis result of the master apparatus 101 and the internal line diagnosis result of the slave apparatus 102 notified from the CPU 141 of the slave apparatus 102, the CPU 111 of the master apparatus 101 determines that the failure source is the port 1 and slave of the master apparatus 101. It is determined whether it is inside the device (packet processing unit 112, 142, interface card 113, 143) of the opposite port of the device 102 or outside the device (optical module 118, 148) (step S210).

  From the above, the CPU 111 of the master device 101 synthesizes the separation results on the transmission side and the reception side of the master device 101 or the slave device 102 and the separation results inside and outside the device, and identifies the suspected location based on both results. Is performed (step S211).

  In the present embodiment, when a failure is detected, the remote diagnosis for the slave device 102 is performed in real time by collecting the transmission / reception light level measurement result of the slave device 102 facing the master device 101 and the diagnosis result of the internal line diagnosis. be able to.

  In the above description, the case where the optical reception interruption from the opposite optical module 148 is detected and the link down is detected is shown. However, the number of error frames such as the FCS error received from the PHY / MAC device 114 is predetermined. Even when it is detected that the number is exceeded, the suspected place can be specified by performing the same processing as described above.

(Effects of the first embodiment)
The effect by 1st Embodiment mentioned above is demonstrated.
Simultaneously with the occurrence of a line failure, the master device 101 and the slave device 102 automatically measure the transmission / reception light level, and based on the measurement result, determine whether the failure source is the transmission side or the reception side of the master device or slave device. In addition, based on the internal line diagnosis result of the master device 101 and the diagnosis result acquired from the slave device 102 by the internal line diagnosis request to the slave device 102, whether the failure source is inside the devices of the master device 101 and the slave device 102. Since it is determined whether it is outside the apparatus, the time required to identify the suspected place can be greatly shortened.

  As another embodiment of the present invention, even in a communication apparatus equipped with an interface card having a line of 10 Gigabit Ethernet optical module, the configuration and operation can achieve the same effect by the mechanism as described above, and the line fault The suspected part can be identified by measuring the light level and the internal line diagnosis.

  Although the present invention has been described with reference to the preferred embodiments and examples, the present invention is not necessarily limited to the above-described embodiments and examples, and various modifications can be made within the scope of the technical idea. Can be implemented.

101: Master device 102: Slave device 111, 141: CPU
112, 142: Packet processing function unit 113, 143: Interface card 114-117, 144-147: PHY / MAC device 118-121, 148-151: Optical module 172: Internal line diagnostic packet 173, 174: Redundant communication path

Claims (26)

In a communication system that connects a plurality of communication devices via a line,
The communication device that has detected a failure is a master device, the communication device opposite the master device is a slave device,
The master device is
Whether the failure source is the transmission side or the reception side of the master device or the slave device based on the measurement result of the transmission / reception level of the own device and the measurement result acquired from the slave device by the transmission / reception level measurement request to the slave device Carving out
Based on the internal line diagnosis result of the own device and the diagnosis result acquired from the slave device by the internal line diagnosis request to the slave device, whether the failure source is inside or outside the device of the own device and the slave device Carving out
A communication system, wherein a suspected place is specified based on a result of separation on a transmission side and a reception side of the master device or the slave device and a result of separation inside and outside the device. The master device is
Measure the transmission / reception level of the failure source port, request the slave device to measure the transmission / reception level of the opposite port,
Based on the measurement result of the transmission / reception level of the own device and the measurement result of the transmission / reception level received from the slave device, the failure source is classified as the transmission side or the reception side of the master device or the slave device,
Performs internal line diagnosis of the own device, requests internal line diagnosis from the slave device, and based on the diagnosis result of the own device and the diagnosis result received from the slave device, the failure source is the failure source of the own device. 2. The communication system according to claim 1, wherein an internal port or an external device of a port opposite to the slave device is determined. The transmission / reception level measurement, the transmission / reception level measurement request, the determination of whether the failure source is the transmission side or the reception side of the master device or the slave device, the internal line diagnosis, the internal line diagnosis request, the inside of the device and the device Each process to identify externally carved and suspected place,
The communication system according to claim 1 or 2, wherein the CPU of the master device is automatically executed simultaneously with the occurrence of a failure. The master device is
The measurement result of the transmission / reception level is compared with a preset reference value, and whether the failure source is the transmission side or the reception side of the master device or the slave device depending on whether the measurement result is within the range of the reference value The communication system according to any one of claims 1 to 3, wherein the communication is performed.   The master device and the slave device acquire a diagnosis result written in the internal line diagnosis packet by transmitting and receiving an internal line diagnosis packet to and from a device having a function of returning the received packet. The communication system according to any one of claims 1 to 4, characterized in that:   2. The communication module of the port of the master device and the slave device has a function of measuring levels of a transmission signal and a reception signal, and is controlled by CPUs of the master device and the slave device. The communication system according to claim 5.   The CPU of the communication device periodically monitors the number of received error frames and the link state from the communication module, and detects a failure based on the number of error frames or the link state. The communication system according to any one of 6. In a communication device connected to a plurality of communication devices via a line,
The communication device that has detected a failure functions as a master device, and the opposing communication device functions as a slave device,
The master device is
Whether the failure source is the transmission side or the reception side of the master device or the slave device based on the measurement result of the transmission / reception level of the own device and the measurement result acquired from the slave device by the transmission / reception level measurement request to the slave device Carving out
Based on the internal line diagnosis result of the own device and the diagnosis result acquired from the slave device by the internal line diagnosis request to the slave device, whether the failure source is inside or outside the device of the own device and the slave device Carving out
A suspicious part is identified based on a result of separation on a transmission side and a reception side of the master device or the slave device and a result of separation inside and outside the device. The master device is
Measure the transmission / reception level of the failure source port, request the slave device to measure the transmission / reception level of the opposite port,
Based on the measurement result of the transmission / reception level of the own device and the measurement result of the transmission / reception level received from the slave device, the failure source is classified as the transmission side or the reception side of the master device or the slave device,
Performs internal line diagnosis of the own device, requests internal line diagnosis from the slave device, and based on the diagnosis result of the own device and the diagnosis result received from the slave device, the failure source is the failure source of the own device. 9. The communication apparatus according to claim 8, wherein the communication apparatus determines whether the internal port or the external port of the opposite port of the slave apparatus is inside or outside the apparatus. The master device is
The transmission / reception level measurement, the transmission / reception level measurement request, the determination of whether the failure source is the transmission side or the reception side of the master device or the slave device, the internal line diagnosis, the internal line diagnosis request, the inside of the device and the device Each process to identify externally carved and suspected place,
The communication device according to claim 8 or 9, wherein the CPU of the master device is automatically executed simultaneously with the occurrence of a failure. The master device is
The measurement result of the transmission / reception level is compared with a preset reference value, and whether the failure source is the transmission side or the reception side of the master device or the slave device depending on whether the measurement result is within the range of the reference value The communication apparatus according to claim 8, wherein the communication device is divided.   The master device and the slave device acquire a diagnosis result written in the internal line diagnosis packet by transmitting and receiving an internal line diagnosis packet to and from a device having a function of returning the received packet. The communication device according to claim 8, wherein the communication device is a device.   9. The communication module at the port of the master device and the slave device has a function of measuring levels of transmission signals and reception signals, and is controlled by CPUs of the master device and the slave devices. The communication apparatus according to claim 12.   The CPU of the communication device periodically monitors the number of received error frames and the link state from the communication module, and detects a failure based on the number of error frames or the link state. 6. The communication device according to any one of 6. A method for identifying a suspected place in a communication system in which a plurality of communication devices are connected via a line,
The communication device that has detected a failure is a master device, the communication device opposite the master device is a slave device,
In the master device,
Whether the failure source is the transmission side or the reception side of the master device or the slave device based on the measurement result of the transmission / reception level of the own device and the measurement result acquired from the slave device by the transmission / reception level measurement request to the slave device The steps of carving out
Based on the internal line diagnosis result of the own device and the diagnosis result acquired from the slave device by the internal line diagnosis request to the slave device, whether the failure source is inside or outside the device of the own device and the slave device The steps of carving out
A method for identifying a suspicious location, comprising: performing a step of identifying a suspicious location based on a result of separation of a transmission side and a reception side of the master device or the slave device, and a result of separation inside and outside the device. In the master device,
Measuring the transmission / reception level of the failure source port and requesting the slave device to measure the transmission / reception level of the opposite port;
Based on the measurement result of the transmission / reception level of the own device and the measurement result of the transmission / reception level received from the slave device, a step of determining whether the failure source is the transmission side or the reception side of the master device or the slave device;
Performing internal line diagnosis of its own device and requesting internal line diagnosis to the slave device;
Based on the diagnosis result of the own device and the diagnosis result received from the slave device, it is determined whether the failure source is inside the device or outside the device of the failure source port of the own device and the opposite port of the slave device. The method according to claim 15, wherein a step is executed. The transmission / reception level measurement, the transmission / reception level measurement request, the determination of whether the failure source is the transmission side or the reception side of the master device or the slave device, the internal line diagnosis, the internal line diagnosis request, the inside of the device and the device Each process to identify externally carved and suspected place,
The method for identifying a suspected place according to claim 15 or 16, wherein the master apparatus automatically executes the failure simultaneously with the occurrence of a failure. In the master device,
The measurement result of the transmission / reception level is compared with a preset reference value, and whether the failure source is the transmission side or the reception side of the master device or the slave device depending on whether the measurement result is within the range of the reference value 18. The method for identifying a suspected place according to any one of claims 15 to 17, characterized by:   The master device and the slave device acquire the diagnosis result written in the internal line diagnosis packet by transmitting / receiving an internal line diagnosis packet to / from a device having a function of returning the received packet. The method for identifying a suspected place according to any one of claims 15 to 18, wherein:   The number of received error frames and the link state from the communication module are periodically monitored by the communication device, and a failure is detected based on the number of error frames or the link state. The identification method of the suspected place in any one. A program that operates on a communication device that is connected to a plurality of communication devices via a line and identifies a suspected place,
The communication device that has detected the failure functions as a master device, and the communication device opposite to the master device functions as a slave device.
In the master device,
Whether the failure source is the transmission side or the reception side of the master device or the slave device based on the measurement result of the transmission / reception level of the own device and the measurement result acquired from the slave device by the transmission / reception level measurement request to the slave device The process of dividing
Based on the internal line diagnosis result of the own device and the diagnosis result acquired from the slave device by the internal line diagnosis request to the slave device, whether the failure source is inside or outside the device of the own device and the slave device The process of dividing
A program for executing a process of identifying a suspected place based on a result of separation on a transmission side and a reception side of the master device or the slave device and a result of separation inside and outside the device. In the master device,
A process of measuring the transmission / reception level of the failure source port and requesting the slave device to measure the transmission / reception level of the opposite port;
Based on the measurement result of the transmission / reception level of the own device and the measurement result of the transmission / reception level received from the slave device, a process of determining whether the failure source is the transmission side or the reception side of the master device or the slave device;
A process of performing an internal line diagnosis of the own device and requesting an internal line diagnosis to the slave device;
Based on the diagnosis result of the own device and the diagnosis result received from the slave device, it is determined whether the failure source is inside the device or outside the device of the failure source port of the own device and the opposite port of the slave device. The program according to claim 21, wherein the program is executed. The transmission / reception level measurement, the transmission / reception level measurement request, the determination of whether the failure source is the transmission side or the reception side of the master device or the slave device, the internal line diagnosis, the internal line diagnosis request, the inside of the device and the device Each process to identify externally carved and suspected place,
23. The program according to claim 21, wherein the master device is automatically executed simultaneously with the occurrence of a failure. In the master device,
The measurement result of the transmission / reception level is compared with a preset reference value, and whether the failure source is the transmission side or the reception side of the master device or the slave device depending on whether the measurement result is within the range of the reference value The program according to any one of claims 21 to 23, wherein a process for performing the separation is executed.   The diagnostic result written in the internal line diagnostic packet is acquired by transmitting / receiving an internal line diagnostic packet to / from the master device and the slave device with a device having a function of returning the received packet. The program according to any one of claims 21 to 23, wherein the program is executed.   The communication apparatus is configured to periodically monitor the number of received error frames and a link state from a communication module, and to execute a process of detecting a failure based on the number of error frames or the link state. The program according to any one of claims 25.

Images