JP4855441B2 - COMMUNICATION DEVICE, TELECOMMUNICATION ANALYSIS SYSTEM, AND COMMUNICATION METHOD - Google Patents

Description

  The present invention relates to a communication device, a remote communication analysis system, and a communication method that remotely monitor the state of protocol communication performed by a communication device connected via a network.

Conventionally, a method using a protocol analyzer is widely known as a general method for analyzing the state of protocol communication performed by a communication apparatus connected via a digital communication network.
FIG. 18 shows a general communication connection configuration in a so-called access communication system between a communication company station and a subscriber. Here, a person who provides a communication line or a communication service is called a communication company, and a facility in which the facilities of the communication company are accommodated is called a station.

  The station 500 includes a transmission / reception signal source 510 and a subscriber line termination device 530, and the user equipment 600 includes an optical line termination device 610, a router 620, and an information terminal 630. A transmission / reception signal source 510 that is installed in the station 500 and is a server that provides a communication service, for example, is connected to the information terminal 630 of the user facility 600 via a transmission line 700 that is an optical fiber line.

  In such a communication connection configuration, a problem may occur in the protocol communication between the subscriber-side information terminal 630 and the station-side transmission / reception signal source 510 for some reason, resulting in communication failure. Therefore, measuring instruments such as a protocol analyzer (protocol analyzer) for analyzing protocol signals flowing between computer networks and data devices are used. Depending on the purpose, the protocol analyzer includes a LAN (Local Area Network) analyzer, a SCSI (Small Computer System Interface: mainly an interface for exchanging data between peripheral devices and hardware such as computers) analyzer, and a PCI (Peripheral). Component Interconnect bus (extended bus architecture for computers) analyzer, GP-IB (General Purpose Interface Bus: IEEE 488 compliant short-distance digital communication bus specification) analyzer, and the like exist.

When a telecommunications company finds any communication failure on the network, or when a subscriber reports a failure to the telecommunications company, a telecommunications company worker goes to the subscriber's home with a measuring instrument. It is common to investigate poor communication locations. For example, the protocol analyzer 640 and the protocol analyzer 650 are connected to the analysis point (a) and the analysis point (b) as shown in FIG. 19, and the protocol signal flowing to each point is captured, and the captured protocol signal is converted into the captured protocol signal. Based on this, the worker investigates and analyzes the communication status at the subscriber's home. If the communication failure does not reproduce during the investigation at the subscriber's home, leave the measuring device at the subscriber's home, collect the measuring device after a certain period of time, and refer to the communication log etc. stored in the measuring device It is also possible to investigate and analyze defects. Further, in Patent Document 1, a monitoring control unit installed in advance on the system side to be monitored compresses time series data that is an operation log stored in time series, and monitors and controls the compressed time series data. The technology to send to the center is shown.
JP 2001-168948 A

  However, as described above, when a worker brings a measuring instrument to a subscriber's house by a failure report from the subscriber and conducts an investigation, the worker's operating cost and management cost are incurred, and there is a problem. There was a time lag between occurrence and investigation, and it was sometimes difficult to quickly find the cause of the failure. Further, in the method disclosed in Patent Document 1, it is assumed that the monitoring control unit installed on the monitoring target side stores time-series data in advance, and does not acquire a protocol signal flowing to the user equipment. .

  In addition, a measuring instrument that an operator brings to a subscriber's home for investigation is generally more expensive and larger than each communication device normally installed on the subscriber's home side. For this reason, there is a risk that the measuring instrument breaks down while the measuring instrument is left in the subscriber's house, and when a large measuring instrument is left in the subscriber's house, the subscriber is spatially disturbed. There's a problem. In addition, when a plurality of subscribers have reported a failure, the worker must bring a measuring instrument to each subscriber's house and prepare a plurality of measuring instruments for investigation. Performing such a preparation at all times is a heavy burden on the telecommunications company. For example, when N breakdowns (N is a natural number) are reported to a station, N measuring instrument purchase costs, travel costs, labor costs, etc. are required. Here, it is conceivable that a function for monitoring protocol communication when a communication failure occurs is pre-installed in a line termination device or the like installed in a subscriber's house in advance. It is considered that the hardware resources of the apparatus will be pressed, the scale of the apparatus will increase, and the apparatus price itself will rise.

  The present invention has been made in view of such a situation, and remote communication that quickly and efficiently monitors a protocol signal transmitted and received by a communication device on the subscriber's home side in the event of a communication failure in a network. An object is to provide an analysis system and a communication method.

  In order to solve the above-described problem, the present invention provides a first communication device (for example, the information terminal 230 and the router 220 in the present embodiment) and a second communication device (for example, the signal transmission / reception via the network). First communication device in a remote communication analysis system including an information server 110) in the present embodiment and a management device (for example, the management device 120 in the present embodiment) connected to the first communication device via a network A communication control unit (for example, the information terminal 230 in the present embodiment) that transmits and receives protocol signals to and from the second communication device via the network, and a protocol that the communication control unit receives from the second communication device. A signal (for example, a downlink digital signal in the present embodiment) and a protocol signal (for example, a transmission signal transmitted from the communication control unit to the second communication device) A signal capturing unit (for example, the signal capturing unit 225 in the present embodiment) that captures the upstream digital signal in the present embodiment, and an identification that provides identification information that can identify itself to the protocol signal captured by the signal capturing unit. An information adding unit (for example, the identification information adding unit 223 in the present embodiment) and an identification information adding signal transmitting unit (for example, the present embodiment) for transmitting a protocol signal having the identification information added to the identification information adding unit to the management apparatus. And a signal re-multiplexing unit 221).

  Further, the present invention provides a protocol signal to which identification information transmitted by the above-described identification information addition signal transmission unit is identified while maintaining a signal format when the protocol signal transmitted and received by the communication control unit is transmitted and received. Information is given and transmitted.

  Further, the present invention is characterized in that the identification information addition signal transmission unit described above transmits a protocol signal to which identification information is added to the same line as a line for transmitting and receiving a protocol signal to and from the second communication device. To do.

  The present invention also provides a remote communication analysis comprising a first communication device and a second communication device that transmit and receive signals via a network, and a management device connected to the first communication device via the network. The first communication device includes a communication control unit that transmits and receives a protocol signal to and from the second communication device via a network, and a protocol signal that is transmitted from the second communication device to the communication control unit. A signal capturing unit that captures a protocol signal that the communication control unit transmits to the second communication device; an identification information providing unit that provides identification information that can identify itself to the protocol signal captured by the signal capturing unit; An identification information addition signal transmission unit that transmits the protocol signal with the identification information added to the identification information addition unit to the management device, wherein the management device is the identification information addition signal transmission unit of the first communication device. Characterized in that it comprises an identification information addition signal receiving unit for receiving a protocol signal to be transmitted.

  In addition, according to the present invention, the management device described above is executed in the first communication device, so that a control program configuring a signal capturing unit, an identification information adding unit, and an identification information adding signal transmission unit is stored in advance. And a terminal control program transmission unit (for example, the terminal control program remote operation unit 123 in the present embodiment) that transmits the control program to the first communication device, and the first communication device transmits the terminal control program of the management device. A control program is received and executed from the control unit, and includes a control program installation unit that constitutes a signal capturing unit, an identification information adding unit, and an identification information adding signal transmission unit.

  Further, the present invention is characterized in that the signal capturing unit of the first communication device described above captures a protocol signal based on a predetermined protocol.

  Further, according to the present invention, the first communication device includes a signal storage unit that stores a protocol signal captured by the signal capturing unit, and the identification information addition signal transmission unit is a protocol stored in the signal storage unit. The signal is transmitted to the management device at a predetermined time.

  According to the present invention, the management device includes a capture protocol identification information transmission unit that transmits a signal including capture protocol identification information indicating a specific protocol to the first communication device, and the first communication device includes: The signal capturing unit captures a protocol signal based on the protocol indicated by the captured protocol identification information included in the protocol signal transmitted from the captured protocol identification information transmitting unit of the management apparatus.

  Further, according to the present invention, the first communication apparatus includes a setting input unit that receives input of capture protocol identification information, and the signal capture unit is based on a protocol indicated by the capture protocol identification information input to the setting input unit. It is characterized by capturing a protocol signal.

  According to the present invention, the management device described above includes an identification information addition signal receiving unit that receives a plurality of protocol signals transmitted from the identification information addition signal transmission unit of the plurality of first communication devices, and an identification information addition signal reception. The unit reads the identification information assigned to each of the plurality of protocol signals received from each of the plurality of first communication devices, and the plurality of protocol signals to which the same identification information is assigned among the plurality of protocol signals are the same The order of a plurality of protocol signals determined as normal communication is determined in advance for a signal determination unit that determines that the first communication device is a series of protocol signals transmitted and received, and a predetermined protocol that is transmitted and received by the first communication device. The order of the stored normal communication protocol signals and the protocol signals transmitted / received to / from the same first communication device by the signal determination unit are determined. Comparing the plurality of protocol signals which are, if there is a difference, to the a determining signal analysis unit was abnormal communication, comprising: a.

  Further, according to the present invention, the management device described above may be one or both of a plurality of protocol signals determined by the signal determination unit as protocol signals transmitted and received with the same communication device, or a determination result determined by the signal analysis unit. It is characterized by having a display part which displays.

  According to the present invention, the first communication device described above is configured such that the identification information addition signal transmission unit of the first communication device is identified via a line different from the line that transmits and receives protocol signals to and from the second communication device. A protocol signal to which information is added is transmitted.

  The present invention also provides a remote communication analysis comprising a first communication device and a second communication device that transmit and receive signals via a network, and a management device connected to the first communication device via the network. The communication control unit of the first communication device in the system transmits and receives the protocol signal to and from the second communication device via the network, and the signal capturing unit receives the communication control unit from the second communication device. Capturing the protocol signal and the protocol signal transmitted from the communication control unit to the second communication device, and the identification information providing unit adding identification information identifying the protocol signal captured by the signal capturing unit to the protocol signal. A step of providing, and a step in which the identification information addition signal transmission unit transmits a protocol signal having the identification information added to the identification information addition unit to the management device. It is a communication method for.

  As described above, according to the present invention, a communication device connected to a management device via a network and transmitting / receiving a signal to / from another communication device captures a protocol signal transmitted / received by its own communication control unit. Since the identification information capable of identifying itself is given to the captured protocol signal and transmitted to the management apparatus, the management apparatus can acquire the protocol signal transmitted and received by the communication apparatus. This makes it possible to investigate the communication status of the communication device via the network without the operator of the communication company bringing the measuring instrument and going to the subscriber's home when the communication device fails. .

  Further, according to the present invention, the protocol signal transmitted / received by the communication device is transmitted with the identification information attached while maintaining the signal format when the protocol signal transmitted / received by the communication device is transmitted / received. Therefore, the protocol signal actually flowing through the communication device can be immediately transmitted to the management device without imposing a processing load on the communication device.

  Further, according to the present invention, the management device transmits a control program that operates each functional unit included in the communication device, and the communication device installs and operates the received control program, and is transmitted and received by its own communication control unit. Since the received protocol signal is captured, identification information capable of identifying itself is added to the captured protocol signal, and the information is transmitted to the management device, the communication device has a function for capturing and transmitting the protocol signal. It becomes possible to provide as needed without having a part in advance.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
<First Embodiment: Configuration>
FIG. 1 is a block diagram showing a configuration of a remote communication analysis system according to the present embodiment.
The remote communication analysis system according to this embodiment includes a management side system 100 and a terminal side system 200, and the management side system 100 and the terminal side system 200 are connected by a transmission line 300. Here, FIG. 1 shows a terminal-side system 200 including one information terminal 230, but the terminal-side system 200 may include a plurality of information terminals 230, or the management-side system 100. May be connected to a plurality of terminal-side systems 200.

The management-side system 100 includes an information server 110, a management device 120, and a subscriber line termination device 130.
The information server 110 is an information communication device that provides an information communication service by transmitting and receiving digital signals according to a predetermined protocol. The information server 110 transmits / receives a protocol signal to / from the information terminal 230 according to a protocol signal communication procedure for establishing a communication connection according to a predetermined protocol. When the communication connection is established, the information server 110 performs information communication with the terminal-side system 200. Do. For example, the information server 110 establishes a communication connection by SIP (Session Initiation Protocol) and establishes a communication connection by HTTP (HyperText Transfer Protocol), a web page, etc. A web server that distributes text information, image information, and the like as digital signals can be applied.

  2 and 3 are diagrams illustrating examples of protocol signals transmitted / received by the information server 110 to / from the information terminal 230. FIG. FIG. 2 is a diagram illustrating a sequence example of protocol signals when the communication connection state is normally established by transmitting and receiving protocol signals. For example, if the bit string indicating the connection request is “01010011”, the information terminal 230 transmits the connection request bit string “01010011” to the information server 110 (step S101). When receiving the connection request transmitted from the terminal-side system 200, the information server 110 transmits a bit string “00001111” that permits connection to the information terminal 230 (step S102).

  When receiving the bit string indicating the connection permission transmitted from the information server 110, the information terminal 230 transmits an ACK (ACKnowledgement: positive response signal) signal to the information server 110, and normally receives the connection permission bit string. The information server 110 is notified of the completion (step S103). When the information server 110 receives the ACK signal transmitted from the information terminal 230, the information server 110 transmits an OK response signal indicating a normal response to the information terminal 230 (step S104). When the information terminal 230 completes reception of the OK response signal transmitted from the information server 110, the communication connection procedure between the information terminal 230 and the information server 110 is completed, communication is established, and actual information communication is performed. It becomes like this.

  On the other hand, FIG. 3 is a diagram illustrating a sequence example of protocol signals when the communication connection state is not normally established. When the information terminal 230 transmits a bit string “01010011” indicating a connection request to the information server 110 (step S105), there is some failure in the information server 110, and the normal response bit string “00001111” is not responded and is abnormal. It is assumed that “00001011” is transmitted as a response bit string (step S106-1). In such a case, even if the terminal-side system 200 receives the bit string “00001011” transmitted from the information server 110, the terminal-side system 200 does not recognize that the information server 110 has permitted the connection, and therefore does not transmit an ACK signal. On the other hand, since the information server 110 does not receive the ACK signal from the terminal-side system 200, the information server 110 continues to retransmit the abnormal response bit string “00001011” to the information terminal 230 (step S106-2). The information server 110 transmits an abnormal response bit string “00001011” to the information terminal 230 a predetermined number of times (for example, N times) (step S106-N), and if there is no ACK response from the information terminal 230, communication connection Assuming that the procedure for establishing the state is unsuccessful, the protocol signal communication connection sequence is terminated, and the actual information communication state is not performed.

  FIG. 4 and FIG. 5 are diagrams showing a sequence example of protocol signals for establishing a communication connection state by SIP defined in RFC 3261 (Request For Comment) in IETF (Internet Engineering Task Force). FIG. 4 shows a sequence example when the communication connection by SIP is successfully established, and FIG. 5 shows a sequence example of protocol signals when the establishment of the communication connection by SIP fails. These describe a sequence example when the User Agent Client defined by RFC3261 is the information terminal 230 and the Proxy Server is the information server 110.

  Returning to FIG. 1, the management device 120 has a function of relaying a digital signal transmitted and received between the information server 110 and the subscriber line termination device 130, and includes an identification information addition signal branching unit 121, a signal determination unit 122. The terminal control program remote operation unit 123, the analysis unit 124, and the display unit 125 are provided.

  The identification information addition signal branching unit 121 branches a protocol signal transmitted from the terminal-side system 200. For example, the identification information adding signal branching unit 121 refers to the IP address and port included in the header part of the protocol signal transmitted from the subscriber line terminating device 130 to the information server 110, and is set to a predetermined IP address and port. The protocol signal including the header part is branched.

  The signal determination unit 122 reads the identification information assigned to each of the plurality of protocol signals received from the plurality of terminal-side systems 200, and the plurality of protocol signals to which the same identification information is assigned among the plurality of protocol signals. It determines with it being a series of protocol signals which the same terminal side system 200 transmitted / received. Here, the identification information is information for identifying a specific information terminal 230 among the plurality of connected information terminals 230 when the plurality of information terminals 230 are connected via the transmission line 300. For example, the IP address and port of the information terminal 230 or the MAC address can be applied to the identification information.

  The analysis unit 124 stores in advance a sequence of a plurality of protocol signals determined as normal communication for a predetermined protocol, and the stored normal communication protocol signal sequence and the same information terminal 230 by the signal determination unit 122. The sequence of protocol signals is compared with the determined sequence. As a result of the comparison, if there is a difference, it is determined that the establishment of the communication connection has failed and there is an abnormality, and if there is no difference, it is determined that the communication connection has been successfully established and is normal.

  The display unit 125 is a display that displays a series of protocol signals transmitted from the terminal-side system 200. For example, when the determination result of the analysis unit 124 indicates abnormality, the display unit 125 displays a character string “NG”. On the other hand, when the determination result of the analysis unit 124 indicates normal, the character string “OK” is displayed. Further, the display unit 125 may display the protocol signal determined as a series of sequences by the signal determination unit 122 as an image as shown in FIG. 6 or FIG. FIG. 6 shows a display example when transmission / reception of a series of protocol signals is normally completed and the communication connection state is successfully established. FIG. 7 shows a display example when transmission / reception of a series of protocol signals ends abnormally and establishment of a communication connection state fails.

  The terminal control program remote operation unit 123 communicates with the control program installation unit 226 provided in the router 220 of the terminal-side system 200 via the network, and causes the router 220 to remotely install or uninstall the control program. The terminal control program remote operation unit 123 stores in advance a control program that operates each unit of the router 220 in its own storage area, and transmits the program to the router 220 including the control program installation unit 226 for installation. Alternatively, a control program uninstall command is transmitted to uninstall the control program. For example, an input unit such as a keyboard or a mouse is provided in the management apparatus 120, and when a control program transmission command is input from the management user to the input unit, the input is transmitted to the terminal-side system 200. For example, OSGi described in the URL “http://www.osgi.org/Main/HomePage” can be applied to the remote operation of such a control program.

  OSGi is middleware defined by the standardization organization OSGi Alliance (formerly called Open Services Gateway initiative) established in March 1999, and defines a service platform that can be managed remotely from a network. This framework provides an environment where control programs and components distributed in bundle format can be installed, started, stopped, and uninstalled without rebooting remotely.

  Next, an embodiment of the management device 120 will be described in detail with reference to FIG. The management device 120 is an input / output port for inputting / outputting an upstream signal transmitted from the subscriber line terminating device 130 to the information server 110 and a downstream signal transmitted from the information server 110 to the subscriber line terminating device 130. Are provided with an input / output port 1201 on the information server 110 side and an input / output port 1202 on the subscriber line terminating device 130 side. The input / output port 1201 is connected via a data bus of an I / O (Input / Output) 1203, and the input / output port 1202 is connected via a data bus from the I / O 1204 to a CPU (Central Processing Unit). ) 1205.

  The CPU 1205 transfers uplink / downlink digital signals transmitted / received between the information server 110 side and the subscriber line terminating device 130 side. On the CPU 1205, an OS (Operating System) operates. For example, Linux (registered trademark) CentOS (hereinafter simply referred to as OS) can be applied to the OS. On the OS, a program as the identification information addition signal branching unit 121 operates. Also, JAVA-VM (Java Virtual Machine, Java Virtual Machine, JAVA is a registered trademark; hereinafter simply referred to as a virtual machine) is installed on the OS, and the signal determination unit 122 and the analysis unit 124 are installed on the virtual machine. As a control program.

  Here, the details of the above-described OS are described in the URL “http://www.centos.org/”, and not only a PC (personal computer) but also an embedded system such as a mobile phone, a mainframe, It is widely applied to super computers such as HPC (high performance computing) clusters.

  The details of the virtual machine described above are described in the URL “http://java.sun.com/”. Such a virtual machine is a stack type virtual machine that executes an instruction set defined as a program bytecode, and is a set of API (Application Programming Interface) and some tools and Java Runtime Environment. (JRE) (Java is a registered trademark). Here, the API is an entrance to a function such as a library prepared in an operating system or a programming language that can be used from an application. By porting and implementing this environment on various OSs, the same program can be executed in various environments.

  In the example of FIG. 8, the control program operating on the CPU 1205 operates as the identification information addition signal branching unit 121 by specifying the identification information specified in advance and opening the socket installed in the OS. In this way, by using the socket together with the specified identification information, a protocol signal having a predetermined header is captured from signals passing through the CPU 1205. In addition, the control program branches the captured protocol signal and calls the read () method of the program, so that the byte array of the captured protocol signal is transferred from the OS to the array A under the control of the control program.

  Further, in the control program, a protocol signal to which the same identification information is assigned is extracted from the byte array of each protocol signal stored in the array A, and the arrival order of the extracted protocol signals is defined in advance by the control program. If it matches the sequence order, it is determined to be normal, and if it does not match, it is determined to be abnormal. For example, when analyzing the sequence of the SIP protocol signal, the control program as the analysis unit 124 uses the byte array of each digital signal stored in the array A, and the protocol identifier stored in the IP header is UDP. A series of protocol signals having a port number of 5060 are extracted. Here, the byte string storing the SIP start line is acquired, and when the byte string is a normal protocol signal sequence by SIP as shown in FIG. 4, it is determined to be normal, and the others are abnormal. Judge. The determination result is displayed on the display unit 125 which is a display connected to the PC main body with a coaxial cable of a D-sub 15-pin connector, for example.

  Returning to FIG. 1, the subscriber line termination device 130 converts signals transmitted and received between the management device 120 side and the transmission line 300 side. For example, the subscriber line termination device 130 is a so-called SLT (Subscriber Line Terminal), and the TCP / IP (Transmission Control Protocol / Internet Protocol) which is a standard protocol based on IETF on the management device 120 side from the subscriber line termination device 130. ), And information communication is performed using an upstream / downstream digital signal having an Ethernet frame (Ethernet is a registered trademark; hereinafter, simply referred to as a frame).

On the other hand, on the transmission line 300 side from the subscriber line terminating device 130, for example, ITU-T (International Telecommunication Union-Telecommunication Standardization Sector) G. Information communication is performed by an optical digital signal by G-PON (Gigabit PON: Passive Optical Network) standardized in the 984 series. The subscriber line terminating device 130 converts the digital signal transmitted from the management device 120 side into an optical digital signal and sends it to the transmission line 300 side, and the optical digital signal transmitted from the transmission line 300 side is converted into a digital signal. To the management device 120. As described above, the subscriber line terminating device 130 functions as a digital input / output interface in the management-side system 100 for digital bidirectional communication via the transmission line 300.
The transmission line 300 is a line that connects the management-side system 100 and the terminal-side system 200, and is, for example, an optical fiber line that performs digital bidirectional communication.

The terminal-side system 200 includes an optical line termination device 210, a router 220, and an information terminal 230 that is a monitoring target of a communication state by the management-side system 100.
The optical line terminator 210 converts optical signals and electrical signals transmitted and received between the router 220 side and the transmission line 300 side, multiplexes / separates digital signals (IP packets), and performs digital input / output of the terminal-side system 200. Acts as an interface. The optical line terminator 210 is, for example, a so-called ONU (Optical Network Unit), and performs communication processing corresponding to the subscriber line terminator 130 on the management system 100 side. The optical line termination device 210 performs communication by an optical digital signal having a G-PON interface on the transmission line 300 side, and an electric digital signal having a frame and performing a communication operation by a TCP / IP protocol on the router 220 side. Convert the digital signal to communicate.

  The router 220 is a communication device that relays and routes IP packet communication via a network. Here, although a broadband router (BBR) is assumed, PBX (Private Branch eXchange), STB (Set-top box), etc. may be applied to the communication device. The router 220 relays digital signals transmitted and received between the optical line termination device 210 and the information terminal 230. In addition, the router 220 includes a signal remultiplexing unit 221, a signal branching unit 222, an identification information adding unit 223, a signal storage unit 224, a signal capturing unit 225, and a control program installation unit 226.

  The control program installation unit 226 receives the control program transmitted from the terminal control program remote operation unit 123 of the management-side system 100, and controls the router 220 in accordance with a command transmitted from the terminal control program remote operation unit 123. Install and enable it, or uninstall and remove it. With such a function of the control program installation unit 226, the management-side system 100 can install or uninstall an arbitrary control program in the router 220 from a remote location via the transmission path 300. For example, OSGi can be applied to the control program installation unit 226 as described above. In the present embodiment, the management apparatus 120 communicates with the control program installation unit 226 to thereby perform each unit of the signal branching unit 222, the signal capturing unit 225, the signal storage unit 224, the identification information adding unit 223, and the signal remultiplexing unit 221. Configure and install the control program that functions as, or remove and uninstall.

  The signal branching unit 222 branches a digital signal having a predetermined header out of an upstream digital signal transmitted from the information server 110 to the information terminal 230 or a downstream digital signal transmitted from the information terminal 230 to the information server 110. To do. For example, the signal branching unit 222 is realized by a socket function provided in the OS, and branches only a digital signal having a specific IP address and an IP header of a port.

The signal acquisition unit 225 detects and filters only the digital signal including the determined information among the digital signals branched by the signal branching unit 222 and causes the signal storage unit 224 to store the digital signal. For example, the signal accumulation unit 224 stores the code of the capture target protocol signal in its own storage area in advance, and only when the bit string included in the payload portion in the frame corresponds to the predetermined protocol signal code. Is stored in the signal storage unit 224. Here, the code of the protocol signal to be filtered by the signal capturing unit 225 is provided from the router 220 or the information terminal 230 by providing the router 220 or the information terminal 230 with a setting change input unit having a mouse such as a keyboard or a mouse. It may be changed according to the information input.
The signal storage unit 224 stores the protocol signal captured by the signal capturing unit 225.

  The identification information adding unit 223 reads the protocol signal stored in the signal storage unit 224 and adds identification information to the header unit. For example, when a frame as illustrated in FIG. 9 is stored in the signal storage unit 224, the identification information adding unit 223 adds identification information to the head of the frame as illustrated in FIG. Here, the identification information provided by the identification information adding unit 223 may be information that allows the management device 120 to identify the information terminal 230 to be monitored. For example, the identification information may be an IP address and a port included in a frame passing through the router 220, or a MAC address given to the information terminal 230 or the router 220 may be applied. The identification information adding unit 223 may immediately take out the digital signal stored in the signal storage unit 224 and give the identification information, or read it from the signal storage unit 224 at regular intervals. good.

  The signal remultiplexing unit 221 remultiplexes the protocol signal to which the identification information is added by the identification information adding unit 223, and transmits the remultiplexed signal to the management system 100 via the optical line terminating device 210. Here, the protocol signal transmitted by the signal re-multiplexing unit 221 maintains the signal format at the time of transmission / reception between the optical line terminating device 210 and the information terminal 230, and is provided with identification information as it is without being processed. To be sent. Here, the signal remultiplexing unit 221 lowers or increases the priority of the protocol signal to which the identification information is added with respect to the digital signal transmitted and received between the optical line terminating device 210 and the information terminal 230. Control such as transmission may be performed.

  Here, an embodiment of the router 220 will be described in detail with reference to FIG. The terminal-side system 200 serves as an input / output port for performing input / output of an upstream signal transmitted from the information terminal 230 to the optical line termination device 210 and a downstream signal transmitted from the optical line termination device 210 to the information terminal 230. In addition, an input / output port 2201 is provided on the optical line terminating device 210 side, and an input / output port 2202 is provided on the information terminal 230 side. The input / output port 2201 is connected to a CPU (Central Processing Unit) 2205 via an I / O (Input / Output) 2203 data bus, and the input / output port 2202 is connected to an I / O 2204 data bus. To the CPU 2205.

  The CPU 2205 transfers upstream and downstream digital signals transmitted and received between the optical line terminating device 210 side and the information terminal 230 side, respectively. On the CPU 2205, an OS (Operating System) operates. A virtual machine is installed on the OS, and on the virtual machine, a control program installation unit 226, a signal branching unit 222, a signal storage unit 224, an identification information adding unit 223, a signal remultiplexing unit 221, a control program installation unit The control program as 226 operates. In addition, on the OS, there is a program for capturing digital signals, for example, “libpcap 0.9.8” software developed in C language whose details are described in the URL “http://www.tcpdump.org/”. It is mounted and operates as the signal acquisition unit 225.

  Here, the digital signal capturing program which is the signal capturing unit 225 specifies a character string indicating a specific protocol signal using, for example, the pcap_compile () function defined in the above-mentioned “libpcap 0.9.8”. To create a logical bandpass filter and set it with the pcap_setfilter () function. At this time, the digital signal acquisition program sets the filter using the OS's setsocket (), for example, a code indicating the IP address, protocol, and port included in the IP header in the Ethernet frame shown in FIG. Only packets that meet the specified conditions are stored in the array A of the control program.

  In the example of FIG. 11, by applying a socket mounted on an OS operating on the CPU 2205, the OS operates as the signal branching unit 222 and communicates between the optical line termination device 210 and the information terminal 230. The upstream / downstream digital signal is branched and guided to a digital signal capturing program as the signal capturing unit 225. For example, the socket is opened by specifying PF_PACKET defined in the OS, the recvfrom () function of the OS as the signal acquisition unit 225 is called, and the received upstream / downstream digital signal data sequence is directly converted into a byte array as a digital signal acquisition program. To receive.

  In addition, an API for data transfer is uniquely defined between the digital signal acquisition program and the virtual machine. Then, the upstream / downstream digital signal captured by the digital signal capturing program is transferred to the array A of the control program operating on the virtual machine.

  Further, in the control program, a control program that operates as the identification information adding unit 223 gives predetermined identification information to the captured digital signal sequence stored in the array A. Here, the identification information adding unit 223 as the control program stores the digital signal to which the identification information is added in the array B.

  Further, between the control program and the OS, a DatagramSocket in the program is generated together with the protocol signal to which the identification information stored in the control program array B mounted on the OSGi is added. For the generated DatagramSocket, the send () method is called, and the byte array of the protocol signal to which the identification information is added is passed to the socket function of the OS acting as the signal remultiplexing unit 221 and multiplexed on the upstream signal, and the optical line The data is sent to the transmission line 300 via the termination device 210.

  The information terminal 230 transmits / receives information through the transmission path 300 according to a protocol determined with the information server 110. As the information terminal 230, for example, a PC (personal computer) or an IP telephone device can be applied.

<First Embodiment: Operation>
Next, an operation example of the remote communication analysis system according to the present embodiment will be described with reference to FIG.
First, the management user of the management-side system 100 transmits a control program to the management apparatus 120 to the terminal-side system 200 when any communication failure is found on the network or when a failure is reported from a subscriber. Enter the command to be executed. The terminal control program remote operation unit 123 of the management system 100 transmits a control program stored in advance in its own storage area to the router 220 in accordance with a command input from the management user (step S1).

  When the control program installation unit 226 of the router 220 receives the control program transmitted from the management-side system 100, the control program installation unit 226 installs the received program in the router 220, and the identification information addition unit 223 as an operable control program, The unit 224 and the signal capturing unit 225 are configured (step S2). Then, the information server 110 of the management-side system 100 transmits a protocol signal for establishing a communication connection with the information terminal 230, with the information terminal 230 as a destination (step S3).

  When receiving the protocol signal transmitted from the information server 110, the information terminal 230 of the terminal-side system 200 starts transmission / reception of the protocol signal according to a predetermined sequence, and starts a process of establishing a communication connection state with the information server 110. To do. The signal branching unit 222 of the router 220 branches the protocol signal passing through the router 220 (step S4). When the signal capturing unit 225 captures the capture target protocol signal among the protocol signals branched to the signal branching unit 222 (step S5), the signal capturing unit 225 accumulates the signal in the signal accumulation unit 224 (step S6). When the identification information adding unit 223 reads the protocol signal stored in the signal storage unit 224 and adds the identification information (step S7), the signal remultiplexing unit 221 transmits the protocol signal to which the identification information is added to the management-side system. 100 (step S8).

  When the identification information addition signal branching unit 121 of the management-side system 100 branches the protocol signal to which the identification information transmitted from the terminal-side system 200 is added (step S9), the signal determination unit 122 outputs the branched protocol signal. Among these, the protocol signal to which the same identification information is assigned is determined as a series of sequences (step S10). The analysis unit 124 compares the series of sequences determined by the signal determination unit 122 with a normal sequence stored in advance to determine whether the sequence is normal, and the display unit 125 outputs the determination result. To do. When the determination process by the management apparatus 120 is completed, the terminal control program remote operation unit 123 of the management apparatus 120 transmits a control program uninstall command to the router 220 according to the user operation (step S13). Upon receiving the control program uninstall command transmitted from the management-side system 100, the control program install unit 226 of the router 220 uninstalls the control program installed in step S2, and provides an identification information adding unit 223, a signal storage unit, 224 and the signal capturing unit 225 are deleted.

  As described above, according to the present embodiment, an expensive and large measuring instrument such as a protocol analyzer is not installed in the measurement system, and no special hardware is added to the communication device at the subscriber's home. The communication status of the communication device at the subscriber's home can be monitored remotely from the management system 100 on the telecommunications company side. This eliminates the labor required for the installation of the measuring instrument, the physical movement cost of the passenger car for moving to the subscriber's house, or for actually carrying out the measurement. In addition, improve the time and cost efficiency of failure analysis of communication devices and systems, identification of the cause of failure, or primary judgment of whether or not personnel dispatch is necessary if the failure is serious. Can do. Furthermore, these human and physical costs are not required, and the time from measurement to analysis / fault cause identification can be greatly shortened.

<Second Embodiment>
Next, a remote communication management system according to the second embodiment of the present invention will be described with reference to FIG. The remote communication management system in this embodiment has the same configuration as that of the first embodiment, and the description of the same configuration and operation is omitted.
The management device 120-2 of the management-side system 100 according to the present embodiment includes a control signal multiplexing unit 126, a control signal transmission unit 127, and a control signal input unit 128.

The control signal input unit 128 receives the input of the code of the digital signal to be captured in the signal capturing unit 225 provided in the router 220-2 of the terminal-side system 200. For example, the control signal input unit 128 has a keyboard as input means and accepts code input from the user. Here, a code for inputting a digital signal to be captured may be a protocol type, an arbitrary character string, a bit string, or the like.
The control signal transmission unit 127 embeds the code of the capture target digital signal input to the control signal input unit 128 in the payload portion, and generates and transmits a packet destined for the router 220-2 as a control signal.
The control signal multiplexing unit 126 multiplexes the control signal transmitted from the control signal transmission unit 127 on the downlink digital signal.

  The router 220-2 includes a control signal branching unit 227. The control signal transmitted from the control signal multiplexing unit 126 is branched, and the code of the acquisition target digital signal included in the control signal is stored in the storage area of the signal acquisition unit 225. Thereafter, the signal acquisition unit 225 operates using the digital signal represented by the code of the acquisition target digital signal stored by the control signal branching unit 227 as the acquisition target.

As illustrated in FIG. 14, the control signal transmitted from the control signal multiplexing unit 126 may be branched by the signal branching unit 222 and transferred to the control signal branching unit 228.
In this way, it is possible to change the code of the acquisition target digital signal of the signal acquisition unit 225 included in the router 220-2 by remote operation from the management system 100.

<Third Embodiment>
Next, a remote communication management system according to the third embodiment of the present invention will be described with reference to FIG. The remote communication management system in this embodiment has the same configuration as that of the first embodiment, and the description of the same configuration and operation is omitted.
The router 220-3 included in the terminal-side system 200 in this embodiment includes a scheduling unit 229. The scheduling unit 229 assigns the identification information to the digital signal stored in the signal storage unit 224 at a certain timing, for example, by specifying 5:00 am in a time zone in which communication traffic on the transmission line 300 is not crowded. Output to the unit 223. In this way, the network load can be distributed over time and the communication state of the information terminal 230 can be monitored.

FIG. 16 is a diagram illustrating a configuration example when the management system 100 and the terminal-side system 200 are connected by the transmission line 300 and the second transmission line 400.

In addition to the above-described embodiments, the following embodiments can be applied.
In the description of the above-described embodiment, the signal branching unit 222 is realized by software processing via the CPU using the socket function of the OS. However, the branch itself can also be realized by hardware processing of another circuit. For example, as shown in FIG. 17, a branch circuit 2206 may be configured between a metal pair terminal 2210 and a terminal 2211 of the LAN cable. Here, the digital signal between the terminal 2210 and the terminal 2211 is branched and guided to the terminal 2212. The digital signal output to the terminal 2212 can be led to the digital signal capturing program from the data bus through the CPU again via the I / O 2204.

  In the above description of the embodiment, the digital signal acquisition program developed in the C language is applied to the signal acquisition unit 225. However, the same function can also be realized by directly configuring with an assembler. In addition to the OS applied in the embodiment, various OSs that control the CPU operation can be applied. The optimum software corresponding to the OS and the environment can be applied to each software language and middleware language operating on the OS.

  In the above description of the embodiment, an optical fiber transmission line is applied to the transmission line 300. However, a metal pair cable, a coaxial cable, and wireless communication may be applied in addition to the optical fiber transmission line. In this case, when a metal transmission line such as a metal pair cable or a coaxial cable is used, the interface on the transmission line 300 side between the management side system 100 and the terminal side system 200 remains as an electric digital signal. In the case of wireless communication, the interfaces on the transmission path 300 side between the management-side system 100 and the terminal-side system 200 are wireless communication interfaces, respectively, thereby configuring upstream / downstream bidirectional communication.

  In the description of the above-described embodiment, the information server 110 and the management device 120 are provided in the management-side system 100, and information communication performed by the information server 110 of the management-side system 100 and the information terminal 230 of the terminal-side system 200 is performed. The protocol signal is configured so that the management apparatus 120 branches, but remote monitoring of communication performed between the terminal-side system 200 and another terminal-side system 200 may be performed. In this case, a protocol signal performed between the terminal-side system 200 and the other terminal-side system 200 may be configured to be captured by the terminal-side system 200, provided with identification information, and transmitted to the management apparatus 120. Is possible.

  The virtual machine, OSGi, and control program described above are transmitted from the management system 100 to the router 220 by an FTP (File Transfer Protocol) command to be operated, and when the remote communication analysis work is completed, the transmitted virtual machine, The OSGi and the control program may be transmitted from the router 220 to the management apparatus 120 by an FTP command. Even in this case, software necessary for use in the above-described embodiment can be operated on the router 220 only when necessary, and the normal operation between the information server 110 and the information terminal 230 is possible. It is possible to prevent the unnecessary memory space from being always occupied during the communication.

  In addition, the same function as the control program installation unit 226 in the router 220 is mounted on each of the optical line termination device 210 and the information terminal 230, and flows to each point of the optical line termination device 210, the router 220, and the information terminal 230. The protocol signal may be captured and transmitted to the management apparatus 120. In this way, by analyzing the communication state of each communication device of each optical line termination device 210, router 220, and information terminal 230, it is possible to evaluate a failure point from a remote location such as isolation of a failure section. Become.

  In addition, when the management-side system 100 is connected to communication devices of a plurality of terminal-side systems 200, each management-side system 100 captures different digital signals according to the characteristics of each communication device and the service to be used. It becomes possible to perform failure point evaluation specialized for the communication device.

  As described above, according to the present invention, in the digital two-way communication system, the communication establishment process of the two-way communication in the analysis-side communication apparatus from the analysis-side communication apparatus or the transmission / reception digital signal during communication is transmitted. By remotely capturing the upstream / downstream digital communication signal of the device, it can be transferred and analyzed to the analyzing communication device, and remote analysis can be performed to immediately analyze the normality of the communication state of the analyzed communication device It becomes possible.

  Further, according to the present invention, as a communication device on the subscriber side, for example, it is not necessary to add special hardware for realizing the present invention on hardware for realizing BBR (broadband router). This is possible without increasing the scale of the system. As a result, for example, remote communication analysis can be realized without increasing the device price of the BBR. In other words, in the maintenance of the communication system, when there is a failure notification of a subscriber facility, it is only necessary to download the software only when necessary, and it is possible not to always need it.

  Further, according to the present invention, it is not necessary to prepare a special expensive measuring instrument such as a protocol analyzer for analyzing the cause of a communication failure, and it is possible to remotely evaluate a failure point in a subscriber communication facility or LAN. It is possible to reduce the human operation for transporting, installing, adjusting, and operating the measuring instrument, and it is possible to reduce the failure handling cost and the handling time.

  Note that a program for realizing the function of the processing unit in the present invention is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to analyze remote communication. May be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

It is a block diagram which shows the terminal structure of the telecommunications analysis system by the 1st Embodiment of this invention. It is a figure which shows the example of a sequence of the protocol signal at the time of normal. It is a figure which shows the example of a sequence of the protocol signal at the time of abnormality. It is a figure which shows the example of a sequence of the protocol signal at the time of normal in SIP communication. It is a figure which shows the example of a sequence of the protocol signal at the time of abnormality in SIP communication. It is a figure which shows the example of a screen displayed on the display part by the 1st Embodiment of this invention. It is a figure which shows the example of a screen displayed on the display part by the 1st Embodiment of this invention. It is a figure which shows the detailed structure of the management apparatus by the 1st Embodiment of this invention. It is a figure which shows the example of the flame | frame which the management apparatus by the 1st Embodiment of this invention and a communication apparatus transmit / receive. It is a figure which shows the example of the flame | frame to which identification information was provided by the 1st Embodiment of this invention. It is a figure which shows the detailed structure of the router by the 1st Embodiment of this invention. It is a flowchart which shows the operation example of the remote communication analysis system by the 1st Embodiment of this invention. It is a block diagram which shows the terminal structure of the telecommunications analysis system by the 2nd Embodiment of this invention. It is a block diagram which shows the terminal structure of the telecommunications analysis system by the 2nd Embodiment of this invention. It is a block diagram which shows the terminal structure of the telecommunications analysis system by the 3rd Embodiment of this invention. It is a block diagram which shows the terminal structure of the telecommunication analysis system by the 4th Embodiment of this invention. It is a block diagram which shows the circuit structure of the signal branch part by other embodiment of this invention. It is a block diagram which shows the terminal structure of the remote communication analysis system by a prior art. It is a block diagram which shows the terminal structure of the remote communication analysis system by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Management system 110 Information server 120 Management apparatus 121 Identification information provision signal branch part 122 Signal determination part 123 Terminal control program remote operation part 124 Analysis part 125 Display part 126 Control signal multiplexing part 127 Control signal transmission part 128 Control signal input part 129 Signal receiving unit 130 Subscriber line terminating device 200 Terminal side system 210 Optical line terminating device 220 Router 221 Signal remultiplexing unit 222 Signal branching unit 223 Identification information adding unit 224 Signal storage unit 225 Signal acquisition unit 226 Control program installation unit 227 Control signal Branch unit 229 Scheduling unit 230 Information terminal 231 Signal transmission unit 300 Transmission line 400 Second transmission line 500 Station 510 Transmission / reception signal source 530 Subscriber line termination device 600 User equipment 610 Optical line termination device 620 Router 630 Information terminal 640 Protocol analyzer 650 Protocol analyzer 700 Transmission line 1201 Input / output port 1202 Input / output port 1203 I / O
1204 I / O
1205 CPU
2201 I / O port 2202 I / O port 2203 I / O
2204 I / O
2205 CPU

Claims (10)

A first communication device (220, 230) and a second communication device (110) for transmitting and receiving signals via an optical line whose uplink line speed is slower than the downlink line speed; and the first communication apparatus And the first communication device in a remote communication analysis system comprising a management device (120) connected via the optical line,
A communication control unit that transmits and receives protocol signals to and from the second communication device via the optical line;
A signal capturing unit that captures the protocol signal received by the communication control unit from the second communication device and the protocol signal transmitted by the communication control unit to the second communication device;
An identification information adding unit that adds identification information that can identify itself to the protocol signal captured by the signal capturing unit while maintaining a signal format when the protocol signal transmitted and received by the communication control unit is transmitted and received. When,
The uplink signal on the same optical line as the optical line on which the communication control unit transmits / receives the protocol signal to / from the second communication device is transmitted to the protocol signal with the identification information added to the identification information adding unit. Via the identification information giving signal transmitter to transmit to the management device,
A communication apparatus comprising: A first communication device (220, 230) and a second communication device (110) for transmitting and receiving signals via an optical line whose uplink line speed is slower than the downlink line speed; and the first communication apparatus And a management device (120) connected via the optical line,
The first communication device is:
A communication control unit that transmits and receives protocol signals to and from the second communication device via the optical line;
A signal capturing unit for capturing the protocol signal transmitted from the second communication device to the communication control unit and the protocol signal transmitted from the communication control unit to the second communication device;
An identification information adding unit that adds identification information that can identify itself to the protocol signal captured by the signal capturing unit while maintaining a signal format when the protocol signal transmitted and received by the communication control unit is transmitted and received. When,
The uplink signal on the same optical line as the optical line on which the communication control unit transmits / receives the protocol signal to / from the second communication device is transmitted to the protocol signal with the identification information added to the identification information adding unit. Via the identification information giving signal transmitter to transmit to the management device,
With
The management device
A remote communication analysis system comprising: an identification information addition signal reception unit that receives the protocol signal transmitted from the identification information addition signal transmission unit of the first communication device. The management device
By being executed in the first communication device, a control program configuring the signal capturing unit, the identification information adding unit, and the identification information adding signal transmitting unit is stored in advance, and the control program is stored in the first communication device. A terminal control program transmission unit for transmitting to one communication device;
The first communication device is:
A control program installing unit configured to receive and execute the control program from a terminal control program transmitting unit of the management apparatus, and to configure the signal capturing unit, the identification information adding unit, and the identification information adding signal transmitting unit; ,
The telecommunications analysis system according to claim 2 , further comprising: Of the first communication device;
The telecommunications analysis system according to claim 2 or 3 , wherein the signal capturing unit captures the protocol signal based on a predetermined protocol. The first communication device is:
A signal storage unit for storing the protocol signal captured by the signal capturing unit;
The said identification information provision signal transmission part transmits the said protocol signal memorize | stored in the said signal storage part to the said management apparatus at the predetermined time. Any one of Claim 2 to 4 characterized by the above-mentioned. The telecommunications analysis system according to item 1. The management device
A capture protocol identification information transmitting unit for transmitting a signal including capture protocol identification information indicating a specific protocol to the first communication device;
Of the first communication device;
The signal capture unit captures the protocol signal based on a protocol indicated by capture protocol identification information included in the protocol signal transmitted from the capture protocol identification information transmission unit of the management device. The telecommunications analysis system according to any one of claims 2 to 5 . The first communication device is:
It has a setting input unit that accepts input of capture protocol identification information,
The signal acquisition unit, according to any one of the preceding claims 2, characterized in that capturing the protocol signal based on the acquisition protocol identification information indicates a protocol in which the input to the set input Remote communication analysis system. The management device
An identification information providing signal receiving unit for receiving the plurality of protocol signals transmitted from the identification information adding signal transmitting units of the plurality of first communication devices;
The identification information giving signal receiving unit reads the identification information given to each of the plurality of protocol signals received from each of the plurality of first communication devices, and the same identification information among the plurality of protocol signals is A signal determination unit that determines that the plurality of assigned protocol signals are a series of protocol signals transmitted and received by the same first communication device;
For the predetermined protocol transmitted and received by the first communication device, the order of a plurality of protocol signals determined as normal communication is stored in advance, and the order of the stored normal communication protocol signals is the same by the signal determination unit. A signal analyzer that compares the plurality of determined protocol signals with the protocol signal transmitted and received with one communication device, and determines that there is an abnormality in communication when there is a difference;
The telecommunications analysis system according to any one of claims 2 to 7 , further comprising: The management device
A display unit for displaying either or both of the plurality of protocol signals determined as the protocol signals transmitted and received by the same communication device and the determination result determined by the signal analysis unit; The telecommunications analysis system according to claim 8 , characterized in that: A first communication device (220, 230) and a second communication device (110) for transmitting and receiving signals via an optical line whose uplink line speed is slower than the downlink line speed; and the first communication apparatus And the management device (120) connected via the optical line of the first communication device in the remote communication analysis system,
A communication control unit transmitting and receiving a protocol signal to and from the second communication device via the optical line;
A signal capturing unit capturing the protocol signal received by the communication control unit from the second communication device and the protocol signal transmitted by the communication control unit to the second communication device;
An identification information providing unit is configured to identify identification information that can identify itself in a state in which a signal format when the protocol signal transmitted and received by the communication control unit is transmitted and received is maintained in the protocol signal captured by the signal capturing unit. Granting steps;
An identification information addition signal transmission unit is the same as the optical line on which the communication information is transmitted / received to / from the second communication apparatus by the communication control unit with the protocol signal to which the identification information is added to the identification information addition unit. Transmitting to the management device via the uplink in the optical line of:
A communication method comprising:

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