JP5324343B2 - Network switch device, network system, and address transmission method - Google Patents

Description

  The present invention relates to a network switch device, a network system, and an address transmission method.

  In recent years, with the adoption of IP (Internet Protocol) in mobile communication networks, network switch devices that relay networks are increasing in mobile radio base stations connected to mobile communication networks. In some cases, a mobile radio base station is added or newly installed in the mobile communication network and a network switch device is newly installed, or a network switch device is newly installed in a mobile radio base station that is already installed. In such a case, it is necessary to make initial settings related to the network, such as the network address (IP address), the subnet mask, and the network address of the default gateway, in the newly installed network switch device.

  As an initial setting method related to the network, for example, there are many cases where the mobile radio base station is manually provided by a local construction contractor. When the network switch device network initial setting is completed, a specialized network maintenance person performs routing (route information) from the remote maintenance station to the mobile radio base station for the purpose of operation and maintenance of the mobile communication network. Etc. can be set in detail.

  In addition, DHCP (Dynamic Host Configuration Protocol) has been standardized as a mechanism for transmitting initial settings related to a network to a network switch device of a mobile radio base station connected to a mobile communication network using TCP / IP (RFC2131). .

  Further, the newly established network switch device is connected to the network by using an ARP packet in which the type field is a specific value for inquiring the network address and the network address can be set in the data field. A technique for inquiring the network address of a device that is inquired and setting the network address of the inquiry result in a route information table is disclosed.

  In addition, the remote maintenance station uses, for example, an Ethernet OAM (Operation Administration and Maintenance) LT (Link Trace) frame, using the MAC (Media Access Control) address of the network switch device that needs to make initial settings related to the network. By doing so, the route information of the network switch device can be known, and the initial setting can be performed based on the route information.

JP 2000-183900 A

  However, the conventional initial setting method related to the network of the newly established network switch device has a problem that the initial setting cannot be performed efficiently.

  In other words, when a local contractor with a mobile radio base station makes initial settings, the contractor is not familiar with CLI (Command Line Interface) commands for network management and must perform initial settings efficiently. I can't. In this case, it takes a lot of labor for a specialized network maintenance person to visit the site and perform the initial setting.

  When the network switch device performs initial setting using DHCP, the DHCP server must be connected to the same segment as the network switch device, and a DHCP server is provided only for initial setting. Is very wasteful.

  Further, when the network switch device sets the route information of the own device using the ARP packet, it is necessary to set the network address of the own device in the ARP packet, and the network address is unknown before the initial setting. Therefore, the ARP packet cannot be used.

  When the remote maintenance station performs initial setting of the network switch device, the LT frame cannot be used unless the remote maintenance station recognizes the MAC address of the network switch device. Initial settings cannot be made.

  The present invention has been made in view of the above, and an object of the present invention is to provide a network switch device, a network system, and an address transmission method capable of efficiently performing initial settings related to a network.

  In order to solve the above-described problems and achieve the object, the network switch device stores a storage unit that stores identification information unique to itself, and a transmission unit that transmits a maintenance frame for maintaining a connection with another device to the maintenance device. Transmission control means for controlling the transmission means to transmit the maintenance frame to the maintenance device based on each bit value of a bit string representing the identification information stored in the storage means in binary representation; The structure provided with is taken.

  As described above, since the network switch device can transmit identification information unique to itself to the maintenance device, the maintenance device can efficiently perform initial setting related to the network.

FIG. 1 is a diagram illustrating an overview of a network system of a mobile communication network according to an embodiment. FIG. 2 is a diagram illustrating the configuration of the network switch device according to the embodiment. FIG. 3 is a diagram showing a frame configuration of Ethernet OAM. FIG. 4 is a functional block diagram illustrating the configuration of the OAM frame insertion unit according to the embodiment. FIG. 5 is a diagram illustrating an example of 4B / 5B code conversion. FIG. 6 is a functional block diagram illustrating the configuration of the OAM frame extraction unit according to the embodiment. FIG. 7 is a diagram illustrating a method for transmitting a MAC address using a CC frame. FIG. 8 is a flowchart illustrating the processing procedure of the frame insertion unit according to the embodiment. FIG. 9 is a flowchart illustrating the processing procedure of the preamble transmission processing unit according to the embodiment. FIG. 10 is a flowchart illustrating the processing procedure of the SFD transmission processing unit according to the embodiment. FIG. 11A is a flowchart illustrating the processing procedure of the data transmission processing unit according to the embodiment. FIG. 11B is a flowchart of a process procedure of the data “0h” transmission process. FIG. 11C is a flowchart illustrating a processing procedure of data “1h” transmission processing. FIG. 11D is a flowchart of the process procedure of the data “2h” transmission process. FIG. 11-5 is a flowchart of the process procedure of the data “3h” transmission process. FIG. 11-6 is a flowchart of a process procedure of the data “4h” transmission process. FIG. 11-7 is a flowchart of the process procedure of the data “5h” transmission process. FIG. 11-8 is a flowchart of a process procedure of the data “6h” transmission process. FIG. 11-9 is a flowchart of the process procedure of the data “7h” transmission process. FIG. 11-10 is a flowchart of the process procedure of the data “8h” transmission process. FIG. 11-11 is a flowchart of the process procedure of the data “9h” transmission process. FIG. 11-12 is a flowchart of the process procedure of the data “Ah” transmission process. FIG. 11-13 is a flowchart of the process procedure of the data “Bh” transmission process. FIG. 11-14 is a flowchart of the process procedure of the data “Ch” transmission process. FIG. 11-15 is a flowchart of the process procedure of the data “Dh” transmission process. FIG. 11-16 is a flowchart of a process procedure of the data “Eh” transmission process. FIG. 11-17 is a flowchart of the process procedure of the data “Fh” transmission process. FIG. 12 is a flowchart illustrating the processing procedure of the idle state transmission processing unit according to the embodiment. FIG. 13 is a flowchart illustrating the processing procedure of the OAM frame extraction unit according to the embodiment. FIG. 14 is a flowchart illustrating a processing procedure of CC frame monitoring processing according to the embodiment. FIG. 15 is a diagram illustrating a processing procedure of data reception processing according to the embodiment. FIG. 16 is a sequence diagram illustrating an example of a method for performing initial setting related to a network by remote maintenance. FIG. 17 is a diagram illustrating a method (modification) for transmitting a MAC address using a CC frame.

  Hereinafter, embodiments of a network switch device, a network system, and an address transmission method according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the present Example.

  FIG. 1 is a diagram showing an outline of a network system of a mobile communication network according to the present embodiment. As shown in FIG. 1, the network system 1 includes mobile radio base stations 10 </ b> A to 10 </ b> Z, upper stations 20 </ b> A to 20 </ b> N, a remote maintenance station 30, and a network 40. In the network system 1, the mobile radio base stations 10 </ b> A to Z are connected to the remote maintenance station 30 via the network 40 via the upper stations 20 </ b> A to 20 </ b> N.

  The mobile radio base stations 10A to 10Z are radio base stations for mobile radio terminals such as mobile phones, and each include network switch devices 11A to Z. And each network switch apparatus 11A-Z is provided with BTS (Base Transceiver Station) apparatus 12A-Z and radio | wireless antenna 13A-Z. The radio antennas 13A to 13Z are antennas necessary for connecting to a plurality of mobile radio terminals managed by the BTS devices 12A to 12Z, respectively.

  The upper stations 20A to N and the remote maintenance station 30 include network switch devices 21A to 21N and a network switch device 31A similar to the network switch device 11, respectively.

  The network switch device 11 is a network relay device, and is a layer 2 switch that determines a data path in layer 2 (data link layer) and transfers the data.

  Of the network switch devices 11, for example, the network switch device 11N, when newly installed in the mobile radio base station 10N, periodically Ethernets based on the bit value of each bit string in which the MAC address of the own device is represented in binary representation. The OAM CC (Continuity Check) frame is controlled to be transmitted, and the MAC address of the own device is transmitted to the remote maintenance station 30. That is, when the network switch device 11N indicates a value of “1” in each bit value of the bit string related to its own MAC address, the network switch device 11N transmits a CC frame at a predetermined cycle, and a value of “0” , The CC frame is not transmitted at a predetermined cycle, and the MAC address of the own device is transmitted to the remote maintenance station 30 by periodically controlling the CC frame transmission.

  This Ethernet OAM CC frame is a standard for maintaining, operating, and managing various events occurring in layer 2 (data link layer) in a relay device such as a layer 2 switch used for network construction. Among these, the frame bears a function (CC function) for confirming the connection with the opposite device. In the example of FIG. 1, the mobile radio base station 10 </ b> N transmits a CC frame to the remote maintenance station 30 via the upper station 20, so that the own device, the upper station 20, and the remote maintenance station 30 are connected to each other. Monitor the connection constantly.

  The Ethernet OAM includes an LB (Loop Back) function, an LT (Link Trace) function, and a DM (Frame Delay Management) function in addition to the CC function. The LB function is a function for confirming bidirectional connectivity between the own apparatus and one target opposing apparatus. Further, the LT function is a function for confirming a route between the own device and one target opposing device. Furthermore, the DM function is a function for measuring the delay of the OAM frame.

  The remote maintenance station 30 is a station that remotely maintains the network switch devices 11 and 21 of the mobile radio base stations 10A to 10Z and the upper stations 20A to 20N, and a specialized network maintenance person is on standby. Further, the remote maintenance station 30 includes a network switch device 31 </ b> A and a PC (personal computer) 14. The network maintenance person uses this PC (personal computer) 14 to perform initial settings and detailed settings related to the network.

  The network switch device 31A normally receives a CC frame at a predetermined cycle, but when the network switch device 31A does not receive the CC frame after a predetermined cycle, recognizes the MAC address of the device to be maintained thereafter using the CC frame. It is determined that the MAC address is to be received, and the subsequent CC frames are periodically received and controlled to recognize the MAC address. That is, the network switch device 31A recognizes the bit value of “1” when the CC frame is received at a predetermined cycle, and “0” when the CC frame is not received at the predetermined cycle. Recognize the bit value and recognize a bit string related to the MAC address of the device to be remotely maintained.

  If the MAC address of the device to be maintained can be recognized in this way, the remote maintenance station 30 transmits the LT frame carrying the LT function in which the MAC address is set as the destination, thereby obtaining the route information of the device having the MAC address. It is possible to recognize a mobile radio base station in which a device having the MAC address is newly installed. As a result, the remote maintenance station 30 can perform initial settings related to the network of the apparatus to be maintained using the information and the MAC address regarding the mobile radio base station. Here, the initial setting related to the network includes an IP address, a subnet mask, and an IP address of a default gateway.

  Next, it is a figure which shows the structure of the network switch apparatus based on an Example. As shown in FIG. 2, the network switch device 11 includes a PHY 11a, a MAC 11b, an OAM 11c, a QoS 11d, a network SW 11e, a CPU 11f, and a MACROM 11g. Although the network switch device 11 is described as a layer 2 switch, it is not limited to this.

  The PHY 11a performs transmission / reception processing of so-called physical layer standard electric signals. Specifically, the PHY 11a shapes the current waveform of the electrical signal received by the port, and outputs the shaped signal to the MAC 11b. The PHY 11a outputs the signal output from the MAC 11b to the port.

  The MAC 11b extracts a main signal forming a MAC frame, which is a layer 2 transmission / reception unit, from the signal output by the PHY 11a, and outputs the extracted main signal to the OAM 11c. Further, the MAC 11b outputs the main signal output by the OAM 11c to the PHY 11a.

  The OAM 11c includes an OAM frame extraction unit 200 that extracts an OAM frame that conforms to Ethernet OAM from a main signal, and an OAM frame insertion unit 100 that inserts an OAM frame into the main signal.

  The OAM frame insertion unit 100 inserts an OAM frame into the main signal acquired from the QoS 11d. Specifically, when the OAM frame insertion unit 100 needs to transmit the MAC address of its own device 11A, the OAM frame insertion unit 100 sets “1” among the bit values of the bit string representing the MAC address in binary representation. When a value is indicated, the CC frame is inserted into the main signal in order to transmit the CC frame at a predetermined cycle. On the other hand, when the value of “0” is indicated, the OAM frame insertion unit 100 does not transmit the CC frame at a predetermined cycle. Accordingly, the OAM frame insertion unit 100 can transmit the MAC address of the own device 11A to the remote maintenance station 30 using the CC frame. The case where the MAC address of the own device 11A needs to be transmitted is, for example, a case where the initial setting related to the network of the own device 11A is not set.

  In addition, when the OAM frame insertion unit 100 acquires a transmission instruction based on, for example, the LB function, the LT function, or the DM function of the Ethernet OAM from the CPU 11f, the OAM frame insertion unit 100 inserts a frame responsible for each function into the main signal according to the transmission instruction of each function. To do.

  The OAM frame extraction unit 200 acquires the main signal output by the MAC 11b and extracts an OAM frame from the acquired main signal. Further, the OAM frame extraction unit 200 monitors whether or not a CC frame is received in a predetermined cycle among the extracted OAM frames. Further, when the OAM frame extraction unit 200 does not receive a CC frame even after a predetermined period has elapsed, if the CC frame is received at a predetermined period for the subsequent CC frames, the OAM frame extraction unit 200 recognizes the bit value as “1”. If it is not received at a predetermined cycle, it is recognized as a bit value of “0” and a bit string related to the MAC address is recognized. Then, the OAM frame extraction unit 200 outputs a bit string related to the recognized MAC address to the CPU 11f.

  When the OAM frame extraction unit 200 receives an OAM frame other than the CC frame among the extracted OAM frames, the OAM frame extraction unit 200 outputs the received OAM frame to the CPU 11f. The OAM frame other than the CC frame includes, for example, an LB frame that bears the LB function, an LT frame that bears the LT function, and a DM frame that bears the DM function.

  Here, the configuration of the OAM frame will be described with reference to FIG. FIG. 3 is a diagram showing a frame configuration of Ethernet OAM. As shown in FIG. 3, the Ethernet OAM frame 50 includes a DA 50a, SA 50b, OAME / T 50c, MEL 50d, Ver 50e, Ope Code 50f, Data 50g, and FCS 50h. The DA 50a indicates a destination MAC address. SA50b indicates the source MAC address. OAME / T50c indicates the type of Ethernet (registered trademark). MEL 50d indicates a management level of a group (MEG: Maintenance Entity Group) indicating a management unit by Ethernet OAM. Ver 50e indicates version information of the OAM frame.

  OpeCode 50f indicates a control code indicating the maintenance type of the OAM frame. For example, when testing the CC function described above, OpeCode 50f = '01 ', when testing the LB function, when OpeCode 50f = '02' or '03', and when testing the LT function, OpeCode 50f = “04” or “05” is designated. Therefore, for example, when OpeCode 50f = “01” is designated, it means that the OAM frame is a CC frame.

  Data 50g indicates a data area having a different configuration depending on the contents of the OpeCode 50f. FCS 50h indicates a frame check sequence (FCS) used for error detection.

  Returning to FIG. 2, the QoS (Quality of Service) 11d acquires a main signal including a frame other than the OAM frame extracted by the OAM 11c, and outputs the acquired main signal to the network SW 11e. Also, the QoS 11d acquires the main signal output by the network SW 11e and outputs the acquired main signal to the OAM frame insertion unit 100 of the OAM 11c.

  The network SW 11e acquires the main signal output by the QoS 11d, analyzes the path corresponding to the destination included in the acquired main signal, and transfers the main signal to the destination device based on the analysis result.

  The CPU 11f is a central processing unit that executes various programs such as CC function, LB function, DM function, and LT function supported by the Ethernet OAM. For example, when the CPU 11 f obtains a bit string related to the MAC address from the OAM frame extraction unit 200, the CPU 11 f outputs an LT frame transmission instruction having the LT function with the MAC address as a destination to the OAM frame insertion unit 100. Thereby, the network switch apparatus 11 can know the base station where the apparatus exists together with the path information of the apparatus to be maintained using the LT frame, and can remotely perform the initial setting related to the network of the apparatus. it can.

  The MACROM 11g is a read only memory (ROM) that stores a MAC address that is identification information unique to the network switch device 11.

  Next, the configuration of the OAM frame insertion unit 100 according to the embodiment will be described with reference to FIG. FIG. 4 is a functional block diagram illustrating the configuration of the OAM frame insertion unit according to the embodiment. As illustrated in FIG. 4, the OAM frame insertion unit 100 includes a clock processing unit 110, a CC transmission unit 120, a CC transmission control unit 130, an OAM frame insertion adjustment unit 140, a storage unit 150, an LB transmission unit 160, and an LT transmission unit 170. And a DM transmitter 180.

  The storage unit 150 also stores a MAC address storage unit 150a that stores the MAC address of the device itself, and a MAC address transmission that stores information indicating whether or not transmission of a MAC address for initial setting regarding the network is necessary. A necessity storage unit 150b.

  The time measurement processing unit 110 is a time measuring device that measures time, measures a predetermined cycle for transmitting a CC frame, and notifies the CC transmission unit 120 that the predetermined cycle is reached when the predetermined cycle is measured. To do. The predetermined period may be, for example, 10 milliseconds or 10 seconds, and is not limited to this.

  The CC transmission unit 120 is a functional unit that transmits a CC frame to the CC transmission control unit 130 at a predetermined cycle. Specifically, the CC transmission unit 120 outputs a CC frame to the CC transmission control unit 130 when receiving a notification from the time measurement processing unit 110 that the predetermined period has been reached.

  Here, in the CC frame, the transmission destination MAC address (DA50a), the transmission source MAC address (SA50b), and the control code (OpeCode50f) are set to “01” indicating the multicast address, the MAC address of the own device, and the CC function, respectively. To do.

  The source MAC address (SA50b) of the CC frame is set to the MAC address of the own device at the start of CC frame transmission, but is overwritten to the SA50b by the relay device (MIP: Maintenance Intermediate Point) that received the CC frame. As a result, the MAC address of the own device cannot be transmitted to the remote maintenance station 30 by the CC frame.

  The CC transmission control unit 130 is a functional unit that transmits the MAC address of its own device using a CC frame for the purpose of initial setting regarding the network. Further, the CC transmission control unit 130 includes a MAC address transmission determination unit 131, a preamble transmission processing unit 132, an SFD transmission processing unit 133, a data transmission processing unit 134, and an idle state transmission processing unit 135.

  The MAC address transmission determination unit 131 determines whether it is necessary to transmit the MAC address of its own device.

  Specifically, the MAC address transmission determination unit 131 transmits the MAC address of its own device according to information indicating whether or not transmission of the MAC address stored in the MAC address transmission necessity storage unit 150b is necessary. It is determined whether or not to do.

  Further, the MAC address transmission determination unit 131 indicates that the MAC address of its own device is transmitted when information indicating that the transmission of the MAC address is necessary is stored in the MAC address transmission necessity storage unit 150b. Notify the transmission processing unit 132.

  On the other hand, the MAC address transmission determination unit 131 transmits a normal CC frame when information indicating that the MAC address of the own device is not necessary is stored in the MAC address transmission necessity storage unit 150b. The CC frame output by the CC transmission unit 120 is output to the OAM frame insertion adjustment unit 140.

  The preamble transmission processing unit 132 uses a CC frame to transmit a preamble bit string indicating the head of transmission data including the MAC address of the own apparatus. Specifically, the preamble transmission processing unit 132 alternately alternates the value “1” and the value “0” 28 times in the same manner as the preamble indicating the head of the MAC frame encoded by the Ethernet encoding method. Repeat and communicate. Therefore, the preamble transmission processing unit 132 outputs the CC frame to the OAM frame insertion adjusting unit 140 at a predetermined period when the value “1” is transmitted, and the CC is transmitted when the value “0” is transmitted. The frame is discarded without being output to the OAM frame insertion adjusting unit 140 at a predetermined cycle. In addition, after transmitting the preamble bit string, the preamble transmission processing unit 132 notifies the SFD transmission processing unit 133 that the preamble transmission is completed.

  The SFD transmission processing unit 133 transmits a bit string of SFD (Start Frame Delimiter) in the transmission data using the CC frame. Specifically, the SFD transmission processing unit 133 transmits the bit string “10101011” in the same manner as the SFD of the MAC frame encoded by the Ethernet encoding method. Therefore, the SFD transmission processing unit 133 outputs the CC frame to the OAM frame insertion adjustment unit 140 at a predetermined cycle when the value “1” is transmitted, and CC when the value “0” is transmitted. The frame is discarded without being output to the OAM frame insertion adjusting unit 140 at a predetermined cycle. In addition, after transmitting the SFD bit string, the SFD transmission processing unit 133 notifies the data transmission processing unit 134 that the SFD transmission is completed.

  The data transmission processing unit 134 uses the CC frame to transmit a bit string in which the MAC address of its own device is represented in binary representation in the transmission data. Specifically, the data transmission processing unit 134 reads the MAC address data of its own device from the MAC address storage unit 150a, and converts the read MAC address data using 4B / 5B code conversion described later. Generate a bit string. Note that 4B / 5B code conversion is code conversion of a 4-bit unit bit string constituting a MAC address into a 5-bit bit string.

  Further, the data transmission processing unit 134 outputs a CC frame to the OAM frame insertion adjusting unit 140 at a predetermined cycle when transmitting a value of “1” in order to transmit a bit string related to the MAC address subjected to code conversion. When the value “0” is transmitted, the CC frame is discarded without being output to the OAM frame insertion adjusting unit 140 at a predetermined cycle. Further, after transmitting the bit string related to the MAC address, the data transmission processing unit 134 notifies the idle signal transmission processing unit 135 that the data transmission is completed.

  Here, an example of 4B / 5B code conversion used in the data transmission processing unit 134 will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of 4B / 5B code conversion. As shown in FIG. 5, the 4B / 5B code conversion example is represented by a table including item number 134a, hexadecimal data 134b, binary data (4 bits) 134c, converted data (5 bits) 134d, and remarks 134e. ing.

  For example, in the item number 134a “15”, the bit string “1110” corresponding to the hexadecimal data 134b “E” is converted to “11001” by 4B / 5B code conversion.

  The difference between the 4B / 5B code conversion in the example of FIG. 5 and the 4B / 5B code conversion of the normal Ethernet encoding method is that three or more “0” values are not consecutive in the 5-bit conversion data 134d. is there. This is because the device on the side that receives the normal CC frame determines that there is a communication error if the period in which the CC frame is not received continues for three cycles, so the device on the side that transmits the CC frame does not transmit the CC frame. Three or more “0” values are not consecutive so that the period does not continue for three cycles or more.

  Returning to FIG. 4, the idle state transmission processing unit 135 transmits a bit string indicating the end of transmission data using the CC frame. Specifically, the idle state transmission processing unit 135 transmits a bit string indicating the end of transmission data as a bit string (idle state) in which five or more “1” s are continuous, so that the number of “1” s continues. The CC frame is output to the OAM frame insertion adjustment unit 140 at a predetermined cycle.

  The OAM frame insertion adjustment unit 140 inserts an OAM frame such as a CC frame into the main signal and transmits the main signal.

  The MAC address transmission necessity storage unit 150b stores information indicating whether or not the MAC address of its own device needs to be transmitted for the purpose of initial setting regarding the network. For example, the MAC address transmission necessity storage unit 150b represents information indicating that transmission of the MAC address of the own device is required by “1”, and indicates information indicating that transmission of the MAC address of the own device is not required “0”. Represented by

  The information stored in the MAC address transmission necessity storage unit 150b stores information indicating that the MAC address needs to be transmitted when the power is turned on for the first time, for example. The information stored in the MAC address transmission necessity storage unit 150b stores information indicating that the MAC address transmission is not necessary to stop the MAC address transmission when the initial setting related to the network is completed. However, the storage timing of the information stored in the MAC address transmission necessity storage unit 150b is not limited to this.

  When the LB transmission unit 160 obtains an instruction to transmit an LB frame having the LB function from the CPU 11f, the LB transmission unit 160 generates an LB frame and outputs the generated LB frame to the OAM frame insertion adjustment unit 140.

  When the LT transmission unit 170 obtains an instruction to transmit an LT frame that bears the LT function from the CPU 11f, the LT transmission unit 170 generates an LT frame and outputs the generated LT frame to the OAM frame insertion adjustment unit 140.

  When the DM transmission unit 180 obtains a transmission instruction of a frame that bears the DM function from the CPU 11 f, the DM transmission unit 180 generates the frame and outputs the generated frame to the OAM frame insertion adjustment unit 140.

  Next, the configuration of the OAM frame extraction unit 200 according to the embodiment will be described with reference to FIG. FIG. 6 is a functional block diagram illustrating the configuration of the OAM frame extraction unit according to the embodiment. As shown in FIG. 6, the OAM frame extraction unit 200 includes an OAM frame extraction adjustment unit 210, a CC determination unit 220, an OAM frame (CC) storage unit 230, a CC monitoring unit 240, a CC reception interval monitoring unit 250, and a MAC address storage. Unit 260 and an OAM frame (other than CC) storage unit 270.

  The OAM frame extraction adjustment unit 210 filters OAM frames such as CC frames and extracts them from the main signal. Specifically, the OAM frame extraction adjustment unit 210 extracts the OAM frame filtered by the control code (OpeCode 50f). The OAM frame extraction adjustment unit 210 performs filtering using the OpeCode 50f. However, the OAM frame extraction adjustment unit 210 is not limited to this, and is not limited thereto. You may filter by MEL50d).

  The CC determination unit 220 determines whether or not the OAM frame extracted by the OAM frame extraction adjustment unit 210 is a CC frame.

  Specifically, the CC determination unit 220 determines whether the control code (OpeCode 50f) of the OAM frame extracted by the OAM frame extraction adjustment unit 210 is “01” indicating the CC function. Further, when the CC determination unit 220 determines that the control code of the extracted OAM frame is “01”, the CC determination unit 220 determines that the OAM frame is a CC frame, and determines the CC frame as an OAM frame (CC). Store in the storage unit 230. On the other hand, when the CC determination unit 220 determines that the control code of the extracted OAM frame is not “01”, the CC determination unit 220 determines that the OAM frame is not a CC frame, and stores the OAM frame (other than the CC). Stored in the unit 270.

  The OAM frame (CC) storage unit 230 uses a first-in first-out (FIFO) algorithm in order from the CC frame stored at the oldest time among the CC frames stored by the CC determination unit 220. To the CC monitoring unit 240 and the CC reception interval monitoring unit 250.

  The CC monitoring unit 240 monitors the CC frame reception cycle. Specifically, the CC monitoring unit 240 determines whether CC frames are stored in the OAM frame (CC) storage unit 230 at a predetermined cycle. Then, the CC monitoring unit 240 outputs, to the CC reception interval monitoring unit 250, whether or not the CC frames stored in the OAM frame (CC) storage unit 230 are stored at predetermined intervals. Also, the CC monitoring unit 240 determines that there is some communication abnormality when the next CC frame is not stored even after a period of 3.5 times the predetermined period has elapsed since the most recent storage time of the CC frame. Then, for example, a “loss of continuity” message indicating a communication abnormality is output to the CPU 11f.

  The CC reception presence / absence monitoring unit 250 is a functional unit that monitors the presence / absence of CC frame reception at predetermined intervals. Further, the CC reception presence / absence monitoring unit 250 includes an initial setting completion determination unit 251, a preamble reception processing unit 252, an SFD reception processing unit 253, and a data reception processing unit 254.

  The initial setting completion determination unit 251 determines whether the initial setting has been completed according to whether or not the CC frame output from the CC monitoring unit 240 in a predetermined cycle is stored.

  Specifically, the initial setting completion determination unit 251 determines that the CC frame output from the CC monitoring unit 240 in a predetermined cycle is “NO” indicating that the storage is not stored, and thereafter, It is determined that the MAC address of the device to be maintained is recognized using the frame, and the preamble reception processing unit 252 is notified that the device to be maintained is initialized.

  On the other hand, the initial setting completion determination unit 251 is a normal CC frame when it indicates “stored” indicating whether or not the CC frame output from the CC monitoring unit 240 is stored every predetermined period is stored. And the CC frame is output to the CPU 11f.

  When the preamble reception processing unit 252 acquires from the initial setting completion determination unit 251 that initial setting of the device to be maintained is performed, the preamble reception processing unit 252 recognizes the preamble bit string indicating the head of the received data including the MAC address of the device to be maintained. .

  Specifically, the preamble reception processing unit 252 monitors the presence / absence of storage of the CC frame from the CC monitoring unit 240 for each predetermined period. If the presence / absence of storage is “present” in the predetermined period, “1” is stored. It is recognized as a bit value, and when the presence or absence of storage is “none” in a predetermined cycle, it is recognized as a bit value of “0”. As a result, the preamble reception processing unit 252 alternately turns the bit value “1” and the bit value “0” 28 times in the same manner as the preamble indicating the head of the MAC frame encoded by the Ethernet encoding method. When recognizing a repeated bit string, it is determined that the preamble has been received and notifies the SFD reception processing unit 253 that the preamble reception has been completed.

  When the SFD reception processing unit 253 obtains from the preamble reception processing unit 252 that the preamble reception has been completed, the SFD reception processing unit 253 recognizes the SFD bit string in the reception data including the MAC address of the device to be maintained.

  Specifically, the SFD reception processing unit 253 monitors the presence / absence of storage of the CC frame from the CC monitoring unit 240 for each predetermined period. If the presence / absence of storage is “present” in the predetermined period, “1” is stored. It is recognized as a bit value, and when the presence or absence of storage is “none” in a predetermined cycle, it is recognized as a bit value of “0”. As a result, when the SFD reception processing unit 253 recognizes the bit string “10101011” similarly to the SFD of the MAC frame encoded by the Ethernet encoding method, the SFD reception processing unit 253 determines that the SFD has been received, The data reception processing unit 254 is notified that the reception has been completed.

  When the data reception processing unit 254 acquires from the SFD reception processing unit 253 that the SFD reception has been completed, the data reception processing unit 254 recognizes a bit string in which the MAC address is represented in binary representation in the received data including the MAC address of the device to be maintained. .

  Specifically, the data reception processing unit 254 monitors the presence / absence of storage of the CC frame from the CC monitoring unit 240 for each predetermined period, and when the presence / absence of storage is “present” in the predetermined period, “1”. It is recognized as a bit value, and when the presence or absence of storage is “none” in a predetermined cycle, it is recognized as a bit value of “0”. In addition, the data reception processing unit 254 converts each bit string into a 4-bit bit string using the above-described 4B / 5B code conversion in units of consecutive 5-bit bit strings, and sequentially converts the converted bit strings to the MAC address storage unit. 260. Then, when the recognized 5 bits are a bit string indicating an idle state, the data reception processing unit 254 determines that reception data has ended, and sequentially connects the bit strings stored in the MAC address storage unit 260 The new bit string is recognized as a bit string related to the MAC address and is output to the CPU 11f.

  The MAC address storage unit 260 temporarily stores a bit string of every 4 bits constituting the MAC address. Note that the MAC address storage unit 260 indicates, for example, a farm register.

  The OAM frame (other than CC) storage unit 270 uses the first-in first-out (FIFO) algorithm from the CC frame stored at the oldest time among the OAM frames stored by the CC determination unit 220. It outputs to CPU11f in order.

  Next, a method for transmitting a MAC address using a CC frame will be described with reference to FIG. FIG. 7 is a diagram illustrating a method for transmitting a MAC address using a CC frame. As shown in FIG. 7, the network switch device 11 of the mobile radio base station 10N transmits its own MAC address to the remote maintenance station 30 using the CC frame.

  In the example of FIG. 7, the network switch device 11N of the mobile radio base station 10N performs 4B / 5B code conversion on the bit string “1110” “0010” for each 4 bits constituting the MAC address, and respectively converts the bit string “11100” “ 10100 "is generated. Then, the network switch device 11N performs transmission control in order from the top of the generated bit string. When the value is “1”, the network switch device 11N sends the CC frame to the remote maintenance station 30 at a predetermined cycle for transmitting the CC frame. Send. Further, when the value is “0”, the network switch device 11 discards the CC frame without transmitting the CC frame to the remote maintenance station 30 in a predetermined cycle for transmitting the CC frame.

  When the network switch device 31A of the remote maintenance station 30 receives the CC frame at a predetermined cycle for receiving the CC frame, the network switch device 31A recognizes the bit value of “1” and at the predetermined cycle for receiving the CC frame. When the CC frame is not received, it is recognized as a bit value of “0”. As a result, the network switch device 11 recognizes the bit string “1110010100”, performs 4B / 5B code conversion on the recognized bit string, and recognizes the bit string “11110000” related to the MAC address.

  As a result, the remote maintenance station 30 can recognize the MAC address of the network switch device 11N of the mobile radio base station 10N.

  Next, processing of the OAM frame insertion unit 100 according to the embodiment will be described with reference to FIG. FIG. 8 is a flowchart illustrating the processing procedure of the OAM frame insertion unit according to the embodiment.

  First, when acquiring the CC frame output by the CC transmission unit 120, the MAC address transmission determination unit 131 refers to the MAC address transmission necessity storage unit 150b to determine whether or not the MAC address of the own device needs to be transmitted. (Step S11).

  When the MAC address transmission determination unit 131 determines that the MAC address of the own device needs to be transmitted (Yes in step S11), the preamble transmission processing unit 132 includes the transmission data including the MAC address of the own device. Preamble transmission processing for transmitting the preamble is performed (step S12).

  When the preamble transmission is completed, the SFD transmission processing unit 133 performs an SFD transmission process for transmitting the SFD in the transmission data (step S13).

  When the SFD transmission is completed, the data transmission processing unit 134 performs a data transmission process for transmitting the MAC address of the own apparatus among the transmission data (step S14).

  When the data transmission is completed, the idle state transmission processing unit 135 performs an idle state transmission process for transmitting the end of transmission data (step S15), and transitions to step S11.

  On the other hand, when the MAC address transmission determination unit 131 determines that it is not necessary to transmit the MAC address of its own device (No in step S11), the process ends.

  Next, processing of the preamble transmission processing unit 132 according to the embodiment will be described with reference to FIG. FIG. 9 is a flowchart illustrating the processing procedure of the preamble transmission processing unit according to the embodiment.

  First, the preamble transmission processing unit 132 sets one time indicating the initial value to the counter (I) indicating the number of times of transmitting the value “1” and the value “0” (step S21).

  Then, the preamble transmission processing unit 132 determines whether or not the counter (I) is equal to or less than 28 times (step S22). If the counter (I) is greater than 28 times (No at step S22), the preamble transmission process is terminated.

  On the other hand, when the counter (I) is equal to or less than 28 (step S22 Yes), the preamble transmission processing unit 132 determines whether it is time to transmit the CC frame (step S23). For example, the preamble transmission processing unit 132 determines whether it is the timing to transmit the CC frame depending on whether the CC frame output from the CC transmission unit 120 in a predetermined cycle is acquired.

  If the preamble transmission processing unit 132 determines that it is not time to transmit a CC frame (for example, no CC frame is acquired from the CC transmission unit 120) (No in step S23), the preamble transmission processing unit 132 transitions to step S23.

  On the other hand, if the preamble transmission processing unit 132 determines that it is the timing to transmit the CC frame (for example, the CC frame is acquired from the CC transmission unit 120) (Yes in step S23), the preamble transmission processing unit 132 transmits the value “1”. Therefore, the CC frame is transmitted through the OAM frame insertion adjustment unit 140 (step S24).

  Subsequently, the preamble transmission processing unit 132 determines whether it is time to transmit the CC frame (step S25).

  If the preamble transmission processing unit 132 determines that it is not the timing to transmit the CC frame (No in step S25), the preamble transmission processing unit 132 transitions to step S25.

  On the other hand, if the preamble transmission processing unit 132 determines that it is time to transmit the CC frame (Yes in step S25), the preamble transmission processing unit 132 discards the CC frame in order to transmit the value “0” (step S26).

  Then, the preamble transmission processing unit 132 adds +1 to the counter (I) (step S27), and then proceeds to step S22 to transmit the value of “1” and the value of “0”.

  Next, processing of the SFD transmission processing unit 133 according to the embodiment will be described with reference to FIG. FIG. 10 is a flowchart illustrating the processing procedure of the SFD transmission processing unit according to the embodiment.

  First, the SFD transmission processing unit 133 sets an initial value of 1 to the counter (I) indicating the number of times of transmitting the value “1” and the value “0” (step S31).

  Then, the SFD transmission processing unit 133 determines whether or not the counter (I) is 3 times or less (step S32). When the counter (I) is 3 times or less (step S32 Yes), the SFD transmission processing unit 133 determines whether it is time to transmit the CC frame (step S33). For example, the SFD transmission processing unit 133 determines whether it is time to transmit a CC frame depending on whether a CC frame output from the CC transmission unit 120 at a predetermined period has been acquired.

  If the SFD transmission processing unit 133 determines that it is not the timing to transmit the CC frame (for example, the CC frame is not acquired from the CC transmission unit 120) (No in step S33), the process proceeds to step S33.

  On the other hand, when the SFD transmission processing unit 133 determines that it is the timing to transmit the CC frame (for example, the CC frame is acquired from the CC transmission unit 120) (Yes in step S33), the value of “1” is transmitted. Therefore, the CC frame is transmitted through the OAM frame insertion adjustment unit 140 (step S34).

  Subsequently, the SFD transmission processing unit 133 determines whether it is time to transmit a CC frame (step S35). If it is determined that it is not time to transmit the CC frame (No in step S35), the process proceeds to step S35.

  On the other hand, when it is determined that it is time to transmit the CC frame (Yes in step S35), the SFD transmission processing unit 133 discards the CC frame in order to transmit the value “0” (step S36).

  Then, the SFD transmission processing unit 133 adds +1 to the counter (I) (step S37), and then proceeds to step S32 to transmit the value of “1” and the value of “0”.

  On the other hand, when the counter (I) is larger than 3 times (No in step S32), the SFD transmission processing unit 133 determines whether it is the timing to transmit the CC frame (step S38). When it is determined that it is not the timing to transmit the CC frame (No in step S38), the process proceeds to step S38.

  On the other hand, when the SFD transmission processing unit 133 determines that it is time to transmit the CC frame (Yes in step S38), the CC frame is transmitted via the OAM frame insertion adjustment unit 140 in order to transmit the value of “1”. (Step S39).

  Further, the SFD transmission processing unit 133 determines whether it is time to transmit a CC frame (step S40). When it is determined that it is not the timing to transmit the CC frame (No in step S40), the process proceeds to step S40.

  On the other hand, if the SFD transmission processing unit 133 determines that it is time to transmit the CC frame (Yes in step S40), the SFD transmission processing unit 133 transmits the CC frame to the OAM frame insertion adjustment unit 140 in order to transmit the value “1”. Are transmitted (step S41), and the SFD transmission process is terminated.

  Next, processing of the data transmission processing unit 134 according to the embodiment will be described with reference to FIG. FIG. 11A is a flowchart illustrating the processing procedure of the data transmission processing unit according to the embodiment.

  First, the data transmission processing unit 134 reads a character string of hexadecimal data of the MAC address of the own device from the MAC address storage unit 150a, and sequentially performs transmission processing from the first character of the read character string of hexadecimal data.

  The data transmission processing unit 134 determines whether there is a character to be transmitted in the character string of hexadecimal data (step S51).

  If the data transmission processing unit 134 determines that there is no character to be transmitted in the hexadecimal character string (No in step S51), the data transmission processing ends.

  On the other hand, if the data transmission processing unit 134 determines that there is a hexadecimal character to be transmitted in the character string of hexadecimal data (step S51 Yes), the data transmission processing unit 134 performs transmission processing based on the hexadecimal character (step S52). ).

  If the hexadecimal character is “0”, data “0h” transmission processing is performed (step S53). If the hexadecimal character is “1”, data “1h” transmission processing is performed (step S54). If the hexadecimal character is “2”, data “2h” transmission processing is performed (step S55).

  If the hexadecimal character is “3”, data “3h” transmission processing is performed (step S56). If the hexadecimal character is “4”, data “4h” transmission processing is performed (step S57). If the hexadecimal character is “5”, data “5h” transmission processing is performed (step S58).

  If the hexadecimal character is “6”, data “6h” transmission processing is performed (step S59). If the hexadecimal character is “7”, data “7h” transmission processing is performed (step S60). If the hexadecimal character is “8”, data “8h” transmission processing is performed (step S61).

  If the hexadecimal character is “9”, data “9h” transmission processing is performed (step S62). If the hexadecimal character is “A”, data “Ah” transmission processing is performed (step S63). If the hexadecimal character is “B”, data “Bh” transmission processing is performed (step S64).

  If the hexadecimal character is “C”, data “Ch” transmission processing is performed (step S65). If the hexadecimal character is “D”, data “Dh” transmission processing is performed (step S66). If the hexadecimal character is “E”, data “Eh” transmission processing is performed (step S67). If the hexadecimal character is “F”, data “Fh” transmission processing is performed (step S68).

  Next, the processing procedure of S53 illustrated in FIG. 11A will be described with reference to FIG. FIG. 11B is a flowchart of a process procedure of the data “0h” transmission process. In the data “0h” transmission process, a transmission process is performed for a 5-bit bit string obtained as a result of 4B / 5B code conversion of the hexadecimal character “0”.

  First, the data transmission processing unit 134 determines whether it is time to transmit a CC frame with respect to the first bit of the bit string (step S53a). For example, the data transmission processing unit 134 determines whether it is time to transmit a CC frame based on whether a CC frame output from the CC transmission unit 120 in a predetermined cycle has been acquired.

  When the data transmission processing unit 134 determines that it is not the timing to transmit the CC frame (for example, the CC frame is not acquired from the CC transmission unit 120) (No in Step S53a), the data transmission processing unit 134 proceeds to Step S53a.

  On the other hand, when determining that it is the timing for transmitting the CC frame (for example, the CC frame is acquired from the CC transmission unit 120) (step S53a Yes), the data transmission processing unit 134 transmits the value “1”. Therefore, the CC frame is transmitted through the OAM frame insertion adjustment unit 140 (step S53b).

  Next, the data transmission processing unit 134 determines whether it is time to transmit the CC frame with respect to the second bit of the bit string (step S53c).

  If the data transmission processing unit 134 determines that it is not the timing to transmit the CC frame (step S53c No), the data transmission processing unit 134 proceeds to step S53c.

  On the other hand, if the data transmission processing unit 134 determines that it is time to transmit the CC frame (Yes in step S53c), the data transmission processing unit 134 transmits the CC frame to the value “1” via the OAM frame insertion adjustment unit 140. (Step S53d).

  Next, the data transmission processing unit 134 determines whether it is time to transmit the CC frame with respect to the third bit of the bit string (step S53e).

  When the data transmission processing unit 134 determines that it is not the timing to transmit the CC frame (step S53eNo), the data transmission processing unit 134 proceeds to step S53e.

  On the other hand, if the data transmission processing unit 134 determines that it is time to transmit the CC frame (step S53e Yes), the data transmission processing unit 134 transmits the CC frame via the OAM frame insertion adjustment unit 140 to transmit the value of “1”. (Step S53f).

  Next, the data transmission processing unit 134 determines whether it is time to transmit a CC frame for the fourth bit of the bit string (step S53g).

  If the data transmission processing unit 134 determines that it is not time to transmit the CC frame (step S53g No), the data transmission processing unit 134 proceeds to step S53g.

  On the other hand, if the data transmission processing unit 134 determines that it is time to transmit the CC frame (step S53gYes), the data transmission processing unit 134 transmits the CC frame via the OAM frame insertion adjustment unit 140 in order to transmit the value “1”. (Step S53h).

  Further, the data transmission processing unit 134 determines whether it is the timing to transmit the CC frame with respect to the fifth bit of the bit string (step S53i).

  If the data transmission processing unit 134 determines that it is not the timing to transmit the CC frame (step S53iNo), the data transmission processing unit 134 proceeds to step S53i.

  On the other hand, when determining that it is the timing for transmitting the CC frame (step S53i Yes), the data transmission processing unit 134 discards the CC frame in order to transmit the value of “0” (step S53j).

  FIGS. 11-3 to 17 are flowcharts for performing transmission processing on a 5-bit bit string obtained as a result of 4B / 5B code conversion of the hexadecimal characters “1” to “F”. Since the processing procedure is the same, the description thereof is omitted.

  Next, processing of the idle state transmission processing unit 135 according to the embodiment will be described with reference to FIG. FIG. 12 is a flowchart illustrating the processing procedure of the idle state transmission processing unit according to the embodiment.

  First, the idle state transmission processing unit 135 sets one time indicating the initial value to the counter (I) indicating the number of times of transmitting the value “1” (step S71).

  Then, the idle state transmission processing unit 135 determines whether or not the counter (I) is 5 times or less (step S72). If the counter (I) is greater than 5 (No at step S72), the idle state transmission process is terminated.

  On the other hand, when the counter (I) is 5 times or less (step S72 Yes), the idle state transmission processing unit 135 determines whether it is time to transmit the CC frame (step S73). For example, the idle state transmission processing unit 135 determines whether it is time to transmit a CC frame depending on whether a CC frame output from the CC transmission unit 120 in a predetermined cycle is acquired.

  If the idle state transmission processing unit 135 determines that it is not the timing to transmit the CC frame (for example, the CC frame is not acquired from the CC transmission unit 120) (No in step S73), the process proceeds to step S73.

  On the other hand, when the idle state transmission processing unit 135 determines that it is the timing to transmit the CC frame (for example, the CC frame is acquired from the CC transmission unit 120) (Yes in step S73), the value “1” is transmitted. Therefore, the CC frame is transmitted through the OAM frame insertion adjustment unit 140 (step S74).

  Then, the idle state transmission processing unit 135 adds +1 to the counter (I) (step S75), and then proceeds to step S72 to transmit the value of “1”.

  Next, processing of the OAM frame extraction unit 200 according to the embodiment will be described with reference to FIG. FIG. 13 is a flowchart illustrating the processing procedure of the OAM frame extraction unit according to the embodiment.

  First, the initial setting completion determination unit 251 determines whether or not the initial setting has been completed (step S81). For example, the initial setting completion determination unit 251 determines whether or not the initial setting has been completed according to whether or not the CC frame output from the CC monitoring unit 240 is stored in the OAM frame (CC) storage unit 230. Determine.

  If the initial setting completion determination unit 251 determines that the initial setting has been completed (the presence / absence of storage is “present”) (Yes in step S81), the initial setting completion determination unit 251 determines that the frame is a normal CC frame, The process of the extraction unit 200 ends.

  On the other hand, when the initial setting completion determination unit 251 determines that the initial setting has not been completed (no storage is “None”) (No in step S81), the device to be maintained using the CC frame thereafter It is determined that the MAC address is recognized, and CC frame monitoring processing for monitoring reception of CC frames at a predetermined cycle is performed (step S82).

  Then, when the initial setting completion determination unit 251 acquires the processing result of the CC frame monitoring process, it is determined whether or not “0” is detected as the processing result (step S83). If the process result does not detect a value of “0” (No in step S83), it is determined that the process is in an idle state (step S93), and the process proceeds to step S81.

  On the other hand, when a value of “0” is detected as the processing result (Yes at Step S83), the preamble reception processing unit 252 performs a CC frame monitoring process for monitoring the reception of the CC frame every predetermined period (Step S84). .

  Then, the preamble reception processing unit 252 determines whether or not the consecutive processing result of the CC frame monitoring process has detected a bit string in which “1” and “0” are alternately repeated 56 times (step S85). If the bit string obtained by alternately repeating “1” and “0” 56 times is not detected as a result of continuous processing of the CC frame monitoring process (No in step S85), it is determined that the preamble has not been received, and the step Transition to S81.

  On the other hand, when a continuous bit sequence of CC frame monitoring processing detects a bit string in which “1” and “0” are alternately repeated 56 times (Yes in step S85), it is determined that a preamble has been received (step S86). ).

  Next, the SFD reception processing unit 253 performs CC frame monitoring processing for monitoring reception of CC frames at predetermined intervals (step S87).

  Then, the SFD reception processing unit 253 determines whether or not a bit string having a continuous processing result of the CC frame monitoring process of “10101011” has been detected (step S88). If the bit string having the continuous processing result of the CC frame monitoring process of “101010111” is not detected (No in step S88), it is determined that the SFD has not been received, and the process proceeds to step S81.

  On the other hand, when a bit string having a continuous processing result of CC frame monitoring processing of “10101101” is detected (Yes in step S88), it is determined that an SFD has been received (step S89).

  Further, the data reception processing unit 254 performs a CC frame monitoring process for monitoring the reception of the CC frame at predetermined intervals (step S90).

  Then, after executing the data reception process (step S91), the data reception processing unit 254 determines that the reception data including the MAC address has ended (step S92), and transitions to step S81.

  Next, the processing procedure of S82, S84, S87 and S90 shown in FIG. 13 will be described with reference to FIG. FIG. 14 is a flowchart illustrating a processing procedure of CC frame monitoring processing according to the embodiment.

  First, the CC frame monitoring process determines whether or not there is a CC frame at a predetermined cycle (step S101). For example, the CC frame monitoring process determines whether there is a CC frame at a predetermined cycle according to whether or not the CC frame output from the CC monitoring unit 240 is stored in the OAM frame (CC) storage unit 230 at a predetermined cycle. Determine whether.

  In the CC frame monitoring process, when it is determined that there are CC frames in a predetermined cycle (when the storage presence is “present”) (Yes in step S101), the value “1” is detected (step S102).

  On the other hand, in the CC frame monitoring process, when it is determined that there is no CC frame at a predetermined period (when the storage presence / absence is “none”) (No in step S101), a value of “0” is detected (step S103).

  Next, the processing procedure of S91 shown in FIG. 13 will be described with reference to FIG. FIG. 15 is a flowchart illustrating a processing procedure of data reception processing according to the embodiment.

  First, the data reception processing unit 254 performs 4B / 5B code conversion according to the bit string “abcde” using the bit string “abcde” of the five consecutive processing results of the CC frame monitoring process as one unit (step S111) (step S111). S112).

  When the data reception processing unit 254 determines that the bit string “abcde” is “11110”, the data reception processing unit 254 confirms the hexadecimal data “0” value (step S113), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “01001”, the data reception processing unit 254 confirms the hexadecimal data “1” value (step S114), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “01101”, the data reception processing unit 254 confirms the hexadecimal data “2” value (step S115), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “10101”, the data reception processing unit 254 confirms the hexadecimal data “3” value (step S116), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “01010”, the data reception processing unit 254 confirms the hexadecimal data “4” value (step S117), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “01011”, the data reception processing unit 254 confirms the hexadecimal data “5” value (step S118), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “01110”, the data reception processing unit 254 confirms the hexadecimal data “6” value (step S119), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “01111”, the data reception processing unit 254 confirms the hexadecimal data “7” value (step S120), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “10010”, the data reception processing unit 254 confirms the hexadecimal data “8” value (step S121), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “10011”, the data reception processing unit 254 confirms the hexadecimal data “9” value (step S122), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “10110”, the data reception processing unit 254 confirms the hexadecimal data “A” value (step S123), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “10111”, the data reception processing unit 254 confirms the hexadecimal data “B” value (step S124), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “11010”, the data reception processing unit 254 confirms the hexadecimal data “C” value (step S125), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “11011”, the data reception processing unit 254 confirms the hexadecimal data “D” value (step S126), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “11001”, the data reception processing unit 254 confirms the hexadecimal data “E” value (step S127), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  When the data reception processing unit 254 determines that the bit string “abcde” is “11101”, the data reception processing unit 254 confirms the hexadecimal data “F” value (step S128), and the MAC address storage unit 260. It is stored in (firm register) (step S129).

  If the data reception processing unit 254 determines that the bit string “abcde” is “11111”, the data reception processing unit 254 confirms that the data (MAC address) has ended (step S130). Then, the data reception processing unit 254 outputs the MAC address obtained by sequentially concatenating the hexadecimal data stored in the MAC address storage unit 260 (firm register) to the CPU 11f, and ends the data reception process.

  If the data reception processing unit 254 determines that the bit string “abcde” is other than that, it is confirmed that the data is invalid data (step S131), and the data reception process is terminated.

  Next, a method for performing initial setting related to the network by remote maintenance will be described with reference to FIG. FIG. 16 is a diagram illustrating an example of a method for performing initial setting related to a network by remote maintenance. In the example of FIG. 16, a case where the network switch device 11N of the newly established mobile radio base station 10N is initialized by the remote maintenance station 30 will be described. Further, it is assumed that the mobile radio base station 10N is connected to the remote maintenance station 30 via the upper station 20.

  In order for the network switch device 11N of the mobile radio base station 10N to be powered on for the first time to transmit its own MAC address, a bit string representing the MAC address in binary representation is transmitted using a CC frame. (Step S201). Specifically, the network switch device 11N transmits a CC frame at a predetermined cycle when transmitting a value of “1” in the bit string, and transmits a value of “0” when transmitting a value of “0”. The CC frame is discarded at a period and is not transmitted.

  Then, the CC frame transmitted from the mobile radio base station 10N is transmitted to the remote maintenance station 30 via the upper station 20N (step S202, step S203).

  Then, the network switch device 31A of the remote maintenance station 30 confirms the MAC address of the network switch device 11N to be maintained based on whether or not a CC frame is received every predetermined period (step S204). Specifically, the network switch device 31A monitors the presence / absence of a CC frame for each predetermined period, and recognizes the bit value of “1” when the presence / absence of reception is “present” in a predetermined period, When the presence / absence of reception is “None” in the period, the bit value is recognized as “0” and the MAC address of the network switch device 11N is confirmed.

  The network switch device 31A that has confirmed the MAC address of the network switch device 11N can recognize the route information of the network switch device 11N having the MAC address by using, for example, an Ethernet OAM LT frame, and can also move the mobile radio base station. It can be recognized that it is installed at 10N.

  Then, the network switch device 31A of the remote maintenance station 30 makes the initial setting to the network switch device 11N installed in the mobile radio base station 10N in order to perform the initial setting such as the IP address for the MAC address of the network switch device 11A. Setting information is transmitted (step S205).

  Then, initial setting information (for example, IP address) transmitted from the remote maintenance station 30 is transmitted to the mobile radio base station 10N via the upper station 20N (steps S206 and S207).

  Then, upon receiving the initial setting information, the network switch device 11N of the mobile radio base station 10N performs initial setting related to the network of the own device (step S208).

  When the initial setting relating to the network is completed, the network switch device 11N stops the transmission of the MAC address using the CC frame since the transmission of the MAC address is not necessary (step S209).

  Then, the network switch device 11N transmits a CC frame at every predetermined period in order to transmit a normal CC frame (steps S210 and S211).

  The network switch device 31A of the remote maintenance station 30 that receives the CC frame at every predetermined period confirms that the initial setting related to the network of the network switch device 11N is completed (step S212).

  Subsequently, the network switch device 31A of the remote maintenance station 30 transmits the detailed setting information to the network switch device 11N installed in the mobile radio base station 10N in order to make detailed settings such as route information of the network switch device 11N. (Step S213).

  Then, the detailed setting information (for example, route information) transmitted from the remote maintenance station 30 is transmitted to the mobile radio base station 10N via the upper station 20N (steps S214 and S215).

  When the network switch device 11N of the mobile radio base station 10N receives the detailed setting information, the network switch device 11N performs the detailed setting related to the network of the own device, and thereafter the remote maintenance station 30 performs maintenance monitoring (step S216). ).

  As described above, according to the present embodiment, the network switch device 11 transmits the CC frame for maintaining the connection with the MAC address storage unit 150a storing the MAC address, which is identification information unique to the device itself, and the other device at a predetermined cycle. The CC transmitter 120 for transmitting to the remote maintenance station 30 is provided. Then, the network switch device 11 transmits the CC frame when each bit value of the bit string representing the MAC address stored in the MAC address storage unit 150a in binary representation is a value “1”. ", The CC frame transmission is controlled so as not to transmit the CC frame.

  As described above, according to the present embodiment, the network switch device 11 can transmit the MAC address of its own device to the remote maintenance station 30 using the CC frame when newly installed on the network. The remote maintenance station 30 can efficiently perform initial settings related to the network.

  As a result, a local contractor who is unfamiliar with the CLI command for network management does not have to perform initial setting related to the network of the network switch device 11, and the network switch device 11 performs erroneous setting of initial settings related to the network. Can be prevented. In addition, the network switch device 11 can save time and labor for a specialized maintenance person.

  In the above embodiment, the network switch device 11 transmits a CC frame at a predetermined cycle when each bit value of the bit string representing the MAC address in binary representation is “1”. In the case of “0”, the case where the CC frame is periodically transmitted is controlled so as not to transmit the CC frame at a predetermined cycle. The present invention is not limited to this.

  For example, a modified example of a method for transmitting a MAC address using a CC frame will be described with reference to FIG. FIG. 17 is a diagram illustrating a method (modification) for transmitting a MAC address using a CC frame. As illustrated in FIG. 17, the network switch device 11 transmits a CC frame in a first predetermined period when each bit value of a bit string representing a MAC address in binary representation is a value of “1”, When the value is “0”, transmission control of the CC frame is performed at a predetermined timing so that the CC frame is transmitted in the second predetermined period. Note that the first predetermined period may be a period different from the second predetermined period.

  In consideration of a case where the CC frame transmitted from the OAM frame insertion unit 100 on the MAC address transmission side is lost in the network 40, for example, the OAM frame insertion unit 100 transmits the transmission data including the MAC address. It may be transmitted multiple times. In this case, the OAM frame extraction unit 200 that recognizes the MAC address may recognize the MAC address a plurality of times, collate the recognized MAC addresses with each other, and confirm an appropriate MAC address.

  Furthermore, in order to stop the transmission of the MAC address using the CC frame, information indicating that the transmission of the MAC address is not necessary is stored in the MAC address transmission necessity storage unit 150b when the initial setting related to the network is completed. explained. The present invention is not limited to this, and the OAM frame insertion adjusting unit 140 may stop the insertion of the VLAN tag.

  As mentioned above, although the Example of this invention was described, the range of the technical idea of this invention is not limited by this Example, and unless it deviates from the range of the technical scope described in the claim, it is various. It goes without saying that various embodiments can be implemented. Moreover, the effect described in the present Example is not limited to this.

  The components of the network switch device 11 shown in the figure are functionally described and are not necessarily physically configured as shown in the figure. The specific mode of the network switch device 11 is as follows. Needless to say, the present invention is not limited to the illustrated one.

  The processing functions performed by the network switch device 11 are all or any part of a microcomputer such as a CPU (Central Processing Unit) (or MPU (Micro Processing Unit) or MCU (Micro Controller Unit)). ) And a program that is analyzed and executed by the CPU (or a microcomputer such as MPU or MCU), or may be realized as hardware by wired logic.

  The following additional remarks are disclosed regarding the embodiment according to the above example.

(Supplementary Note 1) Storage means for storing identification information unique to the own device;
Transmitting means for transmitting a maintenance frame for maintaining a connection with another device to the maintenance device;
Transmission control means for controlling the transmission means to transmit the maintenance frame to the maintenance device based on each bit value of a bit string representing the identification information stored in the storage means in binary representation. A network switch device characterized by that.

(Appendix 2) The transmission means
Sending the maintenance frame at predetermined intervals;
The transmission control means includes
When one of the bit values of the bit string related to the identification information indicates “0” value or “1” value, the maintenance frame is transmitted, and the other bit value is indicated. The network switch device according to appendix 1, wherein the maintenance frame is not transmitted, and the maintenance frame is periodically transmitted.

(Supplementary Note 3) When the maintenance frame transmitted from the transmission control unit of another device is not received even after the predetermined period has elapsed, the reception control unit periodically controls reception of the subsequent maintenance frame. The network switch device according to Supplementary Note 2, wherein

(Appendix 4) The reception control means includes:
When the maintenance frame is received at the predetermined cycle, the one bit value of the transmission control unit is indicated. When the maintenance frame is not received at the predetermined cycle, the transmission control unit The network switch device according to appendix 3, wherein the other bit value is recognized and recognized as a bit string related to the identification information.

(Supplementary Note 5) The transmission control means includes:
Including determination means for determining whether or not the initial setting of the network of the own device is completed,
When the determination unit determines that the initial setting of the network of the own device has been completed, the periodic transmission control of the maintenance frame is stopped. The network switch device described.

(Appendix 6) The identification information is:
6. The network switch device according to any one of appendix 1 to appendix 5, wherein the network switch device is a MAC address (Media Access Control).

(Appendix 7) The maintenance frame is
The network switch device according to any one of appendix 1 to appendix 6, wherein the network switch device is a CC (continuity check) frame of Ethernet OAM (Operation Administration and Maintenance).

(Supplementary Note 8) The transmission control means includes:
In the case where one of the bit values of the bit string related to the MAC address indicates one of the “0” value and the “1” value, the first predetermined period has elapsed since the most recent transmission of the maintenance frame. The maintenance frame is transmitted, and when the other bit value is indicated, the maintenance frame is transmitted after a second predetermined period different from the first predetermined period from the most recent transmission of the maintenance frame. The network switch device according to appendix 1, wherein transmission control of the maintenance frame is performed at a predetermined timing.

(Supplementary note 9) A network system having a network switch device and a maintenance device for performing maintenance of the network switch device,
The network switch device is:
Storage means for storing identification information unique to the device;
Transmitting means for transmitting a maintenance frame for maintaining a connection with another device to the maintenance device;
Transmission control means for controlling the transmission means to transmit the maintenance frame to the maintenance device based on each bit value of a bit string representing the identification information stored in the storage means in binary representation. Have
The maintenance device is
A network system comprising: reception control means for periodically receiving and controlling subsequent maintenance frames when the maintenance frame transmitted from the transmission control means is not received even after the predetermined period has elapsed. .

(Additional remark 10) The memory | storage process which memorize | stores the identification information intrinsic | native to an own apparatus,
A transmission control step of transmitting, to the maintenance device, a maintenance frame for maintaining a connection with another device based on each bit value of the bit string expressed in binary representation of the identification information stored in the storage step. An address transmission method characterized by the above.

DESCRIPTION OF SYMBOLS 1 Network system 10A-Z Mobile radio base station 11A-Z, 21A-N, 31A Network switch apparatus 12A-Z BTS
13A-Z Wireless antenna 14 PC
20A to N Upper station 30 Remote maintenance station 100 OAM frame insertion unit 110 Timekeeping processing unit 120 CC transmission unit 130 CC transmission control unit 131 MAC address transmission determination unit 132 Preamble transmission processing unit 133 SFD transmission processing unit 134 Data transmission processing unit 135 Idle Status transmission processing unit 140 OAM frame insertion adjustment unit 150 storage unit 150a MAC address storage unit 150b MAC address transmission necessity storage unit 160 LB transmission unit 170 LT transmission unit 180 DM transmission unit 200 OAM frame extraction unit 210 OAM frame extraction adjustment unit 220 CC determination unit 230 OAM frame (CC) storage unit 240 CC monitoring unit 250 CC reception interval monitoring unit 251 Initial setting completion determination unit 252 Preamble reception processing unit 253 SFD reception processing unit 254 Data reception processing Physical unit 260 MAC address storage unit 270 OAM frame (other than CC) storage unit

Claims (6)

Storage means for storing identification information unique to the device;
Transmitting means for transmitting a maintenance frame for maintaining a connection with another device to the maintenance device at predetermined intervals ;
When the identification information stored by the storage means indicates any one bit value of “0” value and “1” value among the respective bit values of the bit string expressed in binary representation, the maintenance controlling said transmission means to so that to send frames to the maintenance device, to indicate other bit values, controls the transmitting means so as not to transmit the maintenance frame, the maintenance frame periodically And a transmission control means for controlling transmission. When the maintenance frame transmitted from the transmission control means of another device is not received even after the predetermined period has elapsed, the apparatus has reception control means for periodically receiving control of the subsequent maintenance frames. The network switch device according to claim 1 . The reception control means includes
When the maintenance frame is received at the predetermined cycle, the one bit value of the transmission control unit is indicated. When the maintenance frame is not received at the predetermined cycle, the transmission control unit The network switch device according to claim 2 , wherein the network switch device represents the other bit value and is recognized as a bit string related to the identification information. The transmission control means includes
Including determination means for determining whether or not the initial setting of the network of the own device is completed,
Wherein when it is determined that the network initialization of the own device is completed by the determination means, any one of claims 1 to 3, characterized in that stopping periodic transmission control of the maintenance frame The network switch device described in 1. A network system having a network switch device and a maintenance device for performing maintenance of the network switch device,
The network switch device is:
Storage means for storing identification information unique to the device;
Transmitting means for transmitting a maintenance frame for maintaining a connection with another device to the maintenance device at predetermined intervals ;
When indicating the bit value of either “0” value or “1” value among the respective bit values of the bit string represented by the binary representation of the identification information stored by the storage means ,
The maintenance frame to control the transmission means so that be transmitted to the maintenance device, to indicate other bit values, it controls the transmitting means so as not to transmit the maintenance frame, the period the maintenance frame Transmission control means for controlling transmission in an automatic manner,
The maintenance device is
A network system comprising: reception control means for periodically receiving and controlling subsequent maintenance frames when the maintenance frame transmitted from the transmission control means is not received even after the predetermined period has elapsed. . A storage step for storing identification information unique to the device;
In the case where one bit value of “0” value and “1” value among the respective bit values of the bit string represented by the binary representation of the identification information stored in the storing step is indicated, the other device A transmission control step of transmitting a maintenance frame for maintaining a connection to the maintenance device to the maintenance device and indicating that the other bit value indicates that the maintenance frame is not transmitted and periodically transmitting the maintenance frame. An address transmission method characterized by the above.

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