External optical line monitoring system capable of monitoring network switches and optical transmission devices

Abstract

The present invention relates to an optical line monitoring system capable of monitoring various heterogeneous devices by enabling monitoring of network switches such as backbone switches, L2 and L3 switches, and optical transmission equipment such as SDN, IP-MPLS, and SDH with a single device. The external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention comprises: a network management device (10) that monitors and controls network devices and optical devices constituting the external optical line monitoring system; a network switch (20) that connects the network devices to each other in a local area network (LAN) and transmits data packets to a target network device, or an optical transmission device (21) that converts data into an optical signal using an optical cable and transmits it to the optical device. The network management device (10) periodically monitors whether the optical port of the network switch (20) or optical transmission equipment (21) is in a normal state, and if it is determined to be in an abnormal state, the network management device (10) executes an OTDR measurement command generated by the network management device (10) to measure the location where the optical cable is disconnected, and the network distribution box (40) is provided at the input / output terminal of the network switch (20) or optical transmission equipment (21) to protect the end of the optical cable and connect the optical cable to the network switch (20) or optical transmission equipment (21), and the network management device (10) executes SNMP OID command 1.3.6.1.2.1.2.2.1.8 for all optical ports of the network switch (20) or optical transmission equipment (21) at a predetermined period.+ Performing a periodic optical port monitoring step (S10) of generating (port number to be monitored) and transmitting it to the network switch (20) or optical transmission equipment (21); performing a response step (S20) in which the network switch (20) or optical transmission equipment (21) queries the status of the optical port and returns 1 if it is in a normal state, or 2 if it is in a down state such as a disconnected port; if 2 is returned in the response step (S20), the network management device (10) performs an OTDR equipment verification step (S30) of searching a database in which information of the network switch (20) or optical transmission equipment (21) is stored to check whether the network switch (20) or optical transmission equipment (21) is connected 1:1 to an external OTDR equipment (30); and the network management device (10) checks the external OTDR that is connected 1:1 to the network switch (20) or optical transmission equipment (21) where the optical port is down The technical features include performing an OTDR measurement command transmission step (S40) in which an OTDR measurement command is generated and transmitted to the equipment (30), performing an OTDR measurement step (S50) in which the external OTDR equipment (30) that receives the OTDR measurement command transmits an OTDR measurement signal through an optical cable and measures the distance from the reflected optical signal to the point where the fault occurred, and performing an OTDR measurement result storage step (S60) in which the network management device (10) receives the OTDR measurement result from the external OTDR equipment (30), stores the OTDR event data in an event log database, and stores the OTDR measurement result as OTDR tracking data in an OTDR tracking database according to a predetermined defined data structure.

Description

Technology Field

[0001] The present invention relates to an optical line monitoring system, and more specifically, to an optical line monitoring system capable of monitoring various heterogeneous devices by enabling monitoring of network switches such as SDN, IP-MPLS, backbone switches, L2 switches, L3 switches, and Metro Ethernet, as well as optical transmission equipment such as DWDM equipment, SDH equipment, MSPP equipment, PON equipment, CWMD equipment, PTN equipment, and ROADM equipment, using a single device. Background Technology

[0002] As AI, big data processing, and the computerization of various systems accelerate, demands for data transmission volume and speed are rising. Consequently, linear or ring-shaped multi-stage networks connecting backbone and subscriber networks are predominantly constructed using optical communication, instead of wires with small channel capacities or telecommunications and wireless communications that face bandwidth partitioning issues.

[0003] Optical fiber lines are typically overhead or buried underground, and they form an optical network by being combined with optical network devices such as laser diodes, optical multiplexers, optical distribution boxes, and photovoltaic converters.

[0004] Among the components constituting an optical network, equipment such as optical multiplexers is installed in relatively safe environments, such as separate management centers, central offices, or inside field enclosures. Furthermore, monitoring and management are relatively easy as they are equipped with an Energy Management System (EMS) capable of efficiently managing the equipment. On the other hand, optical fibers are mostly exposed outdoors, and since they are often buried underground, they are affected by the burial or maintenance work of gas or water pipes. In the case of overhead installations, there is a frequent risk of disconnection due to numerous obstacles and other construction processes.

[0005] To monitor such optical fibers, an optical fiber monitoring system was introduced, and an example of such a conventional optical fiber monitoring system is disclosed in ‘Patent Document 1’. FIG. 1 is a conceptual diagram of a conventional optical fiber monitoring system. The conventional optical fiber monitoring system comprises a network management device (1), a central terminal (3) provided between the optical network and the network management device (1) to transmit optical transmission data and OTDR measurement data transmitted from the optical network to the network management device (1), a remote terminal (5) distributed across the optical network to enable optical communication in a local area, an optical distribution box (7) comprising the input / output terminals of the central terminal (3) and the remote terminal (5), and an external OTDR device (9) for OTDR testing the optical network. When a fault such as bending or cutting occurs in the optical fiber, the remote terminal (5) detects this and transmits optical fiber fault information to the network management device (1). The network management device (1) then transmits an OTDR measurement command to the remote terminal (5). By using the external OTDR device (9) connected to the remote terminal (5) to measure the OTDR of the optical fiber, i.e., the distance to the point where the fault occurred, and then transmitting the result to the network management device (1), the network manager can recognize the location of the fault in the optical fiber. Make it possible.

[0006] However, conventional optical fiber monitoring systems have a function in which the central terminal (3) and the remote terminal (5) detect optical fiber fault information and automatically transmit it to the network management device (1), so there is no problem. However, most network switches or optical transmission equipment that do not have this function cannot detect optical fiber fault information and automatically transmit it. Therefore, there is a problem in that the network management device (1) cannot detect an optical fiber disconnection fault and cannot take action even after an optical fiber fault occurs. Prior art literature

[0008] KR 10-2287778 B1 (2021. 8. 3.) The problem to be solved

[0009] The present invention has been devised to solve the above-mentioned problems, and the objective of the present invention is to provide an external optical line monitoring system that enables periodic monitoring of the port status of a remote terminal in a network management device and is applicable to various network switches and optical transmission equipment, particularly simple devices equipped only with switching and optical transmission functions. means of solving the problem

[0010] An external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention comprises: a network management device that monitors and controls network devices and optical devices constituting the external optical line monitoring system; an optical transmission device that converts data into an optical signal and transmits it to the optical device using a network switch or optical cable that connects the network devices to each other in a local area network and transmits data packets to a target network device; an external OTDR device that measures the location where the optical cable is disconnected by executing an OTDR measurement command generated by the network management device when the network management device periodically monitors whether the optical port of the network switch or optical transmission equipment is in a normal state and determines that it is in an abnormal state; and an optical distribution box provided at the input / output terminal of the network switch or optical transmission equipment to protect the end of the optical cable and connect the optical cable to the network switch or optical transmission equipment, wherein the network management device performs SNMP OID command 1.3.6.1.2.1.2.2.1.8 for all optical ports of the network switch or optical transmission equipment at a predetermined period.+ Performs a periodic optical port monitoring step of generating (port number to be monitored) and transmitting it to the network switch or optical transmission equipment; performs a response step in which the network switch or optical transmission equipment queries the status of the optical port and returns 1 if it is in a normal state, or 2 if it is in a down state such as a disconnected port; if 2 is returned in the response step, the network management device performs an OTDR equipment verification step of searching a database storing information about the network switch or optical transmission equipment to check whether an external OTDR device is connected 1:1 to the network switch or optical transmission equipment; performs an OTDR measurement command transmission step in which the network management device generates and transmits an OTDR measurement command to the external OTDR device connected 1:1 to the network switch or optical transmission equipment where the optical port is down; performs an OTDR measurement step in which the external OTDR device, having received the OTDR measurement command, transmits an OTDR measurement signal through an optical cable and measures the distance from the reflected optical signal to the point where the failure occurred; and the network management device receives the OTDR from the external OTDR device The technical feature is to perform an OTDR measurement result storage step in which the measurement result is received, the OTDR event data is stored in an event log database, and the OTDR measurement result is stored as OTDR tracking data in an OTDR tracking database according to a predetermined defined data structure. Effects of the invention

[0011] The external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention is capable of periodically identifying the status of network switches and optical transmission equipment constituting the system.

[0012] In addition, it offers high versatility as a monitoring system can be configured using IP regardless of the type of network switch or optical transmission equipment.

[0013] In addition, it is possible to monitor optical cables (optical lines) currently in use, and therefore, the monitoring system can be configured regardless of the number of network switches or optical transmission equipment connected while the network switches or optical transmission equipment are in an active state. Brief explanation of the drawing

[0015] Figure 1 shows a conventional optical fiber monitoring system FIG. 2 is a software-defined network applicable to an external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention. FIG. 3 shows an external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention applied to a ring-type software-defined network. Figure 4 is a separated view of part A of Figure 3. FIG. 5 is a high-density wavelength division multiplexing network applicable to an external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention. FIG. 6 shows a form in which an external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention is applied to a ring-type high-density wavelength division multiplexing network. Figure 7 is a separated view of part B of Figure 6. Figure 8 shows a process in which a network management device monitors an optical port of a network switch or optical transmission equipment. Figure 9 is an IP-MLPS network Figure 10 is a Metro Ethernet network FIG. 11 shows an external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention applied to a single IP-MLPS. FIG. 12 shows an external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention applied to a ring-type metro Ethernet network. Figure 13 shows the SDH network Figure 14 is an MSPP network Figure 15 shows the CWMD network Figure 16 is a PON network Figure 17 is a PTN network FIG. 18 shows a form in which an external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention is applied to a ring-type SDH network. FIG. 19 shows an external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention applied to an MSPP network. FIG. 20 shows an external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention applied to a CWMD network. FIG. 21 shows a form in which an external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention is applied to a PTN network. FIG. 22 shows a form in which an external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention is applied to a tree-type PON network. Specific details for implementing the invention

[0016] Hereinafter, an external optical line monitoring system capable of monitoring a network switch and optical transmission equipment according to the present invention will be described in detail with reference to the attached drawings.

[0018] FIG. 2 is a software-defined network (SDN) to which an external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention can be applied, FIG. 3 is a form in which an external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention is applied to a ring-type software-defined network, and FIG. 4 is a separated view of part A of FIG. 3. FIG. 5 is a high-density wavelength division multiplexing (DWDM) network to which an external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention can be applied, FIG. 6 is a form in which an external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention is applied to a ring-type high-density wavelength division multiplexing network, and FIG. 7 is a separated view of part B of FIG. 6.

[0019] An external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention is composed of a network management device (10), a network switch (20) such as a software-defined network switch or optical transmission equipment (21) such as a high-density wavelength division multiplexing device, an external OTDR device (30), and an optical distribution box (40), wherein the network switch (20) or optical transmission equipment (21) is connected to each other by optical cables to form a network such as a ring type, linear type, or star type.

[0020] The network management device (10) is a component that monitors and controls the entire network device and optical equipment constituting an external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention, such as network switches (20) or optical transmission equipment (21) and LAN switches, node routers, optical line terminals (OLT), optical network units (ONU), and private branch exchanges (PBX) connected thereto.

[0021] A network switch (20) is a component that generally connects network devices such as computers, servers, hubs, and other network switches in a local area network (LAN) and transmits data packets to target network devices. Examples include a software-defined network switch that configures the software-defined network shown in FIG. 2, an L2 switch that operates at Layer 2 based on MAC addresses, an L3 switch that operates at Layer 3 based on IP addresses, an IP-MLPS switch that configures an Internet Protocol-based MLPS, a Metro Ethernet switch used in a Metro Ethernet network that configures a long-distance network like a local area network, and a backbone switch that processes large-scale traffic at high speed at the center of the network.

[0022] Optical transmission equipment (21) is a component that converts data into an optical signal using an optical cable and transmits it to an optical device, and includes DWDM equipment that forms a high-density wavelength division multiplexing network as shown in FIG. 5, SDH equipment that forms a synchronous optical network, MSPP equipment that forms a multiple service provision network, CWMD equipment that forms a dense wavelength division multiplexing network that simultaneously transmits multiple different wavelengths of light in one optical fiber, PTN equipment that forms a packet transmission network, PON equipment that forms a passive optical network, and ROADM equipment that forms a ROADM (Reconfigurable Optical Add / Drop Multiplexer) network.

[0023] The external OTDR device (30) is a component that measures the location where the optical cable is disconnected (OTDR measurement) by executing an OTDR measurement command generated by the network management device (10) when the network management device (10) periodically monitors whether the optical port of the network switch (20) or optical transmission device (21) is in a normal state and determines that it is in an abnormal state.

[0024] FIG. 8 illustrates a process in which a network management device monitors an optical port of a network switch or optical transmission equipment. As shown in FIG. 8, an external OTDR device (30) is connected to a network switch (20) or optical transmission equipment (21) via an Ethernet cable, and can receive an OTDR measurement command transmitted by the network management device (10) via the network switch (20) or optical transmission equipment (21).

[0026] The specific monitoring process is as follows.

[0027] ① Periodic optical port monitoring step (S10): The network management device (10) checks whether the optical port is in a normal state by querying the SNMP OID for all optical ports of the network switch (20) or optical transmission equipment (21) at a predetermined period. For example, it generates a command in the format 1.3.6.1.2.1.2.2.1.8. + (port number to monitor) which is a command to monitor the port, and transmits it to the network switch (20) or optical transmission equipment (21).

[0028] ② Response step (S20): The network switch (20) or optical transmission equipment (21) checks the status of the optical port and responds 1 if it is in a normal state, and 2 if it is in a down state such as a disconnected port.

[0029] ③ OTDR Equipment Verification Step (S30): When 2 is returned in the response step (S20), the network management device (10) searches a database in which information about the network switch (20) or optical transmission equipment (21) is stored to verify whether the external OTDR equipment (30) is connected 1:1 to the network switch (20) or optical transmission equipment (21).

[0030] ④ OTDR measurement command transmission step (S40): The network management device (10) generates and transmits an OTDR measurement command to the external OTDR equipment (30) most suitable for OTDR measurement in the OTDR equipment verification step (S30), that is, the external OTDR equipment (30) connected 1:1 to the network switch (20) or optical transmission equipment (21) where the optical port is down.

[0031] ⑤ OTDR measurement step (S50): An external OTDR device (30) that receives an OTDR measurement command transmits an OTDR measurement signal through an optical cable and measures the distance from the reflected optical signal to the point where the fault occurred.

[0032] ⑥ OTDR measurement result storage step (S60): The network management device (10) receives the OTDR measurement result from the external OTDR device (30), stores the OTDR event data in the event log database, and stores the OTDR measurement result as OTDR tracking data in the OTDR tracking database according to a predetermined defined data structure.

[0033] The reason why monitoring of optical ports by SNMP OID has become possible is that, in the past, network switches (20) and optical transmission equipment (21) grew from different base technologies and could not use the same commands, but recently, as both network switches (20) and optical transmission equipment (21) have switched to IP-based systems, the same commands can be used.

[0034] The optical distribution box (40) is a component provided at the input / output terminal of the network switch (20) or optical transmission equipment (21) to protect the end of the optical cable and to connect the optical cable to the network switch (20) or optical transmission equipment (21).

[0036] FIG. 9 is an IP-MLPS network, FIG. 10 is a metro Ethernet network, FIG. 11 is a form in which an external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention is applied to a single IP-MLPS, and FIG. 12 is a form in which an external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention is applied to a ring-type metro Ethernet network, and it can be seen that an external optical line monitoring system can be configured with the same structure as FIG. 3, except that the type of network switch is different.

[0037] FIGS. 13 to 17 are exemplary diagrams of optical networks to which an external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention can be applied, in order to SDH network, MSPP network, CWMD network, PON network, and PTN network, and FIGS. 18 to 22 are examples of the external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention applied to ring-type SDH network, MSPP network, CWMD network, PTN network, and tree-type PON network, in order, and it can be seen that the external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention can be configured with the same structure as FIG. 6, with only the type of optical transmission equipment changed.

[0039] Although the external optical line monitoring system capable of monitoring network switches and optical transmission equipment according to the present invention has been described above as performing OTDR measurements in one direction, for example, in a counterclockwise direction in a ring network, it is also possible to perform OTDR measurements in a clockwise direction in a ring network, so that bidirectional measurements are possible and an external optical line monitoring function can be provided to various types of network switches (20) or optical transmission equipment (21) to identify fault points in the optical line. Explanation of the symbols

[0041] 10 Network Management Devices 20 Network Switches 21 Optical transmission equipment 30 External OTDR device 40 optical splitter boxes S10 Periodic light port monitoring step S20 Response step S30 OTDR Equipment Verification Step S40 OTDR Measurement Command Transmission Step S50 OTDR measurement step S60 OTDR measurement result storage step

Claims

Claim 1 A network management device (10) that monitors and controls network devices and optical devices constituting an external optical line monitoring system; a network switch (20) that connects the network devices to each other in a local area network (LAN) and transmits data packets to target network devices, or an optical transmission device (21) that converts data into an optical signal using an optical cable and transmits it to the optical device; an external OTDR device (30) that measures the location where the optical cable is disconnected by executing an OTDR measurement command generated by the network management device (10) when the network management device (10) periodically monitors whether the optical port of the network switch (20) or optical transmission device (21) is in a normal state and determines that it is in an abnormal state, and an optical distribution box (40) that is provided at the input / output terminal of the network switch (20) or optical transmission device (21) to protect the end of the optical cable and connect the optical cable to the network switch (20) or optical transmission device (21), wherein the network switch (20) is an IP-based network switch (20) and is a software-defined network switch, L2 It is any one of a switch, L3 switch, IP-MLPS switch, Metro Ethernet switch, or backbone switch, and the optical transmission equipment (21) is an IP-based optical transmission equipment (21) and is any one of DWDM equipment, SDH equipment, MSPP equipment, PON equipment, CWMD equipment, PTN equipment, or ROADM equipment, and the network switch (20) and the optical transmission equipment (21) lack a function to detect optical line fault information, and the network management device (10) at a predetermined period transmits SNMP OID command 1.3.6.1.2.1.2.2.1.8 to all optical ports of the network switch (20) or optical transmission equipment (21).+ Performing a periodic optical port monitoring step (S10) of generating (port number to be monitored) and transmitting it to the network switch (20) or optical transmission equipment (21), and performing a response step (S20) in which the network switch (20) or optical transmission equipment (21) queries the status of the optical port and returns 1 if it is in a normal state and 2 if it is in a down state, and if 2 is returned in the response step (S20), the network management device (10) performs an OTDR equipment verification step (S30) of searching a database in which information of the network switch (20) or optical transmission equipment (21) is stored to check whether an external OTDR equipment (30) is connected 1:1 to the network switch (20) or optical transmission equipment (21), and the network management device (10) [determines] the external OTDR equipment (30) connected 1:1 to the network switch (20) or optical transmission equipment (21) where the optical port is down An external optical line monitoring system capable of monitoring a network switch and optical transmission equipment, characterized by performing an OTDR measurement command transmission step (S40) of generating and transmitting an OTDR measurement command, an external OTDR device (30) that receives the OTDR measurement command performs an OTDR measurement step (S50) in which it transmits an OTDR measurement signal to an optical cable and measures the distance from the reflected optical signal to the point where the fault occurred, and a network management device (10) performs an OTDR measurement result storage step (S60) in which it receives the OTDR measurement result from the external OTDR device (30), stores the OTDR event data in an event log database, and stores the OTDR measurement result as OTDR tracking data in an OTDR tracking database according to a predetermined defined data structure. Claim 2 delete Claim 3 delete

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