CN101902369A - Fault location method and device for backplane crossover system - Google Patents

Abstract

The invention discloses a fault location method and device for a backplane cross system. Wherein, the method includes: the network management system receives alarm information indicating service signal transmission failure from the first detection point; the network management system sends a loopback command indicating that the service signal is looped back on the transmission line of the service signal to the backplane crossover system, The faulty subsystem unit is located according to the execution result of the loopback. Through the invention, the time for fault location can be shortened and the maintenance cost can be reduced.

Description

Fault location method and device for backplane crossover system

technical field

The present invention relates to the communication field, in particular to a fault location method and device for a backplane cross-connect system.

Background technique

Using backplane crossover technology in the field of Wavelength Division Multiplexing (WDM for short) can provide a variety of flexible methods and usage scenarios for hierarchical scheduling of sub-wavelength (electrical domain) signals.

The use of backplane cross-connection technology can improve the processing and scheduling capabilities of services, but since the entire service processing (mainly cross-connection functions) is distributed to various parts of the system, and all subsystem units of the system cannot have complete alarm detection functions, in many cases In this case, it is only possible to judge whether the service is normal based on the service output, but not to locate the location of the fault.

Taking the backplane cross-connect system shown in Figure 1 as an example, it is assumed that the service signal enters from the client-side R port, passes through the backplane cross-connect system, is sent from the line-side T-side, and then is connected to the line-side R-side, and finally sent by the client-side T-side send out. If it is detected that there is a problem with the signal finally received from the T terminal on the client side, the problem may be before the T terminal on the line side, or after the T terminal on the line side. Generally, the R port on the line side has a service alarm detection point. If a service failure alarm is found on the R port on the line side, it can indicate that the service has a problem before it is received from the R port on the line side. However, the service signal is received from the client-side R port to the line-side R port, and passes through six subsystem units including the client unit, transmission unit 1, cross-connect unit, transmission unit 2, line unit, and transmission unit 3. If alarm detection units are set between each subsystem unit (as shown in A, B, C, D, and E in the figure), it is possible to determine where the fault occurred. However, in practical applications, due to changes in business granularity ( Generally, due to technical and cost considerations, no alarm detection point will be set at A~E. If you need to know the fault point, you can only manually search by segment by segment, which increases the difficulty of fault location and maintenance. the cost of.

Contents of the invention

The main purpose of the present invention is to provide a fault location method and device for a backplane cross-connect system, so as to at least solve the above-mentioned problems of difficult fault location and high maintenance cost.

According to one aspect of the present invention, a fault location method for a backplane cross-connect system is provided, including: the network management system receives an alarm message indicating service signal transmission failure from a first detection point; the network management system sends an indication service to the backplane cross-connect system The signal executes the loopback command of the loopback on the transmission line of the service signal, and locates the faulty subsystem unit according to the execution result of the loopback.

According to another aspect of the present invention, a fault location device for a backplane cross-connect system is provided, including: a receiving module, configured to receive alarm information from a detection point; a sending module, configured to trigger and at the same time send a loopback command to the backplane cross-connect system indicating that the service signal is looped back on the transmission line of the service signal; the positioning module is used to locate the failed subsystem unit according to the execution result of the loopback.

Through the present invention, the loopback function is used to locate the fault of the backboard cross system, which simplifies the traditional fault location process, shortens the positioning time, and reduces the maintenance cost.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic structural diagram of a backplane crossover system in the prior art;

FIG. 2 is a flowchart of a fault location method for a backplane cross-connect system according to Embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of loopback according to Embodiment 1 of the present invention;

FIG. 4 is another schematic diagram of loopback according to Embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of an internal loopback of a subsystem unit according to Embodiment 1 of the present invention;

FIG. 6 is a flow chart of locating a fault in a backplane cross-connect system in Embodiment 2 of the present invention;

7 is a schematic diagram of the internal loopback of the client unit in Embodiment 3 of the present invention;

Fig. 8 is a flowchart of determining where the fault occurs inside the client unit in the third step of the embodiment of the present invention;

FIG. 9 is a schematic diagram of the loopback of the backplane cross system in Embodiment 4 of the present invention;

FIG. 10 is a flow chart of fault location in Embodiment 4 of the present invention;

Fig. 11 is a fault location device of a backplane cross-connect system according to Embodiment 5 of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

Loopback means that at the loopback location, the service signal is directly sent back along the direction it came from. The loopback function can be implemented on each subsystem unit (single board) in the backplane crossover system, and the loopback function can also be implemented in multiple places inside some subsystem units. The embodiment of the present invention utilizes the loopback function in the backplane cross-connect system to locate the fault of the backplane cross-connect system.

Embodiment one

FIG. 2 is a flow chart of a fault location method for a backplane cross-connect system according to Embodiment 1 of the present invention. The method mainly includes the following steps:

Step S202, the network management system receives the alarm information indicating the failure of service signal transmission from the first detection point;

For example, in FIG. 3 , it is assumed that a detection point is set downstream of the T port on the line side. The detection point detects that the service transmission direction is client side → line side fails, and sends an alarm message to the network system.

Step S204, the network management system sends a loopback command to the backplane cross-connect system, instructing the above-mentioned service signal to execute the loopback command on the transmission line of the service signal, and locates the faulty subsystem unit according to the execution result of the loopback.

For example, in Figure 3, if the network management system receives the alarm information sent by the detection point downstream of the T port on the line side, it will send a loopback command to the backplane cross-connect system, indicating that the service signal is looped back at the backend of the client-side system in Figure 3 After receiving the loopback command, the backplane cross-connect system executes the loopback at the back end of the client side system in Figure 3. If the loopback line is connected (that is, the network management system does not receive the alarm information), the network management system determines that a fault occurs in line unit.

In the prior art, when a fault occurs in the backplane cross-connect system, it is necessary to manually locate the fault step by step, resulting in problems such as low fault location efficiency and high maintenance costs. However, in the above method provided by Embodiment 1 of the present invention, the network management When the system receives the alarm information, it instructs the backplane cross-connection system to perform a loopback to locate the failed subsystem unit, thereby simplifying the process of fault location, shortening the location time, reducing the density of alarm detection points, and saving equipment. Cost, reducing the difficulty of fault location and maintenance costs.

In the above step S204, the network management system may select a loopback port for loopback of the service signal on the transmission line of the service signal, and then send a loopback command to the backplane cross-connect system, instructing the loopback of the service signal to be performed on the loopback port. After the service signal is looped back at the port, if the network management system receives the alarm information from the detection point (that is, the second detection point), it can be determined that the fault occurs on the subsystem unit on the current loopback line; otherwise, the network management system It can be determined that the fault occurred on a subsystem unit of the backplane cross-connect system that is outside the current loopback line. For example, in Figure 3, if the network management system indicates that the service signal from the client side → the line side is looped back at the back end of the client side system, then the service signal is looped back at the ingress end of the line unit and flows to the T port of the client unit, if The T port is set with a detection point. If the detection point detects the alarm information, it means that the current loopback line is unavailable, and the fault occurs on the cross-connect unit or customer unit. , the fault occurred on the line unit.

In practical application, the network management system can select any port on the transmission line of the service signal as the loopback port according to the specific application, so as to further improve the efficiency of fault location. For example, according to experience, in Figure 3, the client unit is prone to failure, and then the network management system, after receiving the alarm information from the detection point downstream of the T port on the line side, sends an instruction service signal to loop back at the front end of the client side system shown in Figure 3 After the backplane cross-connect system receives the loopback command, the service signal is looped back at the front end of the client-side system. If the detection point of the client-side T port detects that the service signal fails, and sends an alarm message to the network management system, Then the network management system can determine that the client unit fails. Alternatively, the network management system may also select the loopback line that includes the most subsystem units, for example, in FIG. 3 , it indicates that the service signal is looped back at the back end of the client system.

If the network management system determines that the fault occurs on the subsystem unit on the current loopback line, if there are multiple subsystem units on the current loopback line, the network management system can further send a loopback command to the backplane cross-connect system to reduce the current loopback. The loopback line indicates that the service signal performs a loopback at the upstream port (which may or may not be adjacent) of the loopback port that performed the loopback last time to determine the failed subsystem unit. Specifically, the following steps may be performed:

Step 1, the network management system sends a loopback command to the backplane cross-connect system, instructing the service signal to perform loopback at the upstream port of the loopback port that performed the loopback last time;

Step 2, the network management system judges whether the alarm information of the detection point is received, if yes, then it is determined that the fault occurs on the subsystem unit of the current loopback line, if there is only one subsystem unit of the current loopback line, then the fault occurs in this loopback line On the subsystem unit, otherwise, return to step 1; if the network management system does not receive the alarm information, it is determined that the fault occurs on the subsystem unit between the current loopback port and the last selected loopback port.

For example, in Figure 3, if the service signal is looped back at the back end of the client side system, and the network management system receives the alarm information, it is determined that the fault occurred on the client unit or the cross-connect unit, and the network management system further sends a loopback command to instruct the service The signal is looped back at the R port on the client side. If the alarm information is still generated, it is determined that the client unit is faulty; otherwise, it is determined that the cross-connect unit is faulty.

If in the above step 2, there are multiple subsystem units between the current loopback port and the last selected loopback port, the network management system will continue to send the loopback command to the backplane cross-connect The loopback port between the loopback port and the last loopback port performs a loopback until the subsystem unit that has failed can be determined according to the loopback execution result.

When the network management system determines that the fault occurs on the subsystem unit outside the current loopback line, and there are multiple subsystem units outside the current loopback line, the network management system can further instruct the remaining loopbacks of the service signal outside the current loopback line The port performs a loopback to determine the specific subsystem unit that has failed, which may include the following steps:

Step 1, the network management system sends a loopback command to the backplane cross-connect system, indicating that the service signal is at the downstream port of the loopback port of the last loopback of the backplane cross-connect unit (it can be adjacent or not, and the priority is adjacent ) performs a loopback;

Step 2, the network management system judges whether the alarm information is received, if yes, the network management system determines that the fault occurs on the subsystem unit between the current loopback port and the loopback port that performed the loopback last time, otherwise, the network management system determines the fault It occurs on the subsystem unit outside the current loopback line. If there are multiple subsystem units outside the current loopback line, return to step 1.

In the above step 2, if there are multiple subsystem units between the current loopback port and the last loopback port, the network management system will continue to instruct the service signal between the current loopback port and the last loopback port. Loopbacks are performed on the loopback ports between the loopback ports until the failed subsystem unit can be determined based on the loopback results.

In practical applications, when the normal transmission line of a certain service signal passes through many subsystem units, when the network management system instructs the service signal to perform loopback for the first time, it can indicate that the service signal is in the middle of the normal transmission line. The ingress and/or egress ports of the unit perform a loopback, which further improves the efficiency of fault location.

In practical applications, the loopback port where the network management system instructs the service signal to perform loopback can be located at the ingress port of each subsystem unit of the backplane crossover system for the service signal, as shown in the loopback of the backend loopback of the client-side system in Figure 3 The port is located at the input port of the line unit, or at the output port of the subsystem unit, as shown in Figure 4. The loopback port of the front-end loopback of the client-side system is at the output port of the cross-connect unit, or it can also be located at the output port of a certain line unit. Both ingress and egress ports are looped back so that it can be determined whether the fault occurred at the front end or the back end of a subsystem unit.

In practical applications, if each module inside a subsystem unit can also implement the loopback function, after determining that the subsystem unit fails, the network management system can also send a loopback command to the backplane cross-connection subsystem, indicating that the service signals are respectively Loopbacks are performed at various modules inside the subsystem unit to determine the failed module. For example, in Figure 5, a certain subsystem unit includes four modules A, B, C, and D, and each module can realize loopback. For services from the client side to the line side, the backplane cross-connection subsystem can indicate The service signal first performs a loopback at module C (it can also be module A or B, which can be determined according to requirements). If the loopback line is connected, it is determined that module D is faulty. Otherwise, the network management system can continue to indicate that the service signal is in the module. Loopback is performed at B until the failed module is identified.

Embodiment two

Embodiment 2 of the present invention uses the backplane cross-connect system shown in FIG. 3 or FIG. 4 as an example to describe the fault location method of the backplane cross-connect system provided by the embodiment of the present invention.

Fig. 6 is a flow chart for locating the fault of the backplane cross-connect system in Embodiment 2 of the present invention, which mainly includes the following steps:

Step 601, connect customer unit, cross unit and line unit according to Fig. 3/4;

Step 602, for the business whose transmission direction is client side → line side, the detection point downstream of the T port on the line side detects whether there is an alarm for the business sent by the T port on the line side;

The embodiment of the present invention takes the business whose transmission direction is client side → line side as an example to illustrate. For the business whose transmission direction is line side → client side, the detection point downstream of the T port on the client side detects the business sent by the T port on the client side Are there warnings.

Step 603, the service sent from the T port on the line side is detected to be service failure at the downstream detection point, and the detection point sends an alarm message to the network management system;

Step 604, the network management system sends a loopback command to the backplane crossover system, instructing the service signal to execute the backend loopback of the client side system as shown in Figure 4;

Step 605, the network management system judges whether to receive the alarm information of the detection point downstream of the T port on the client side. If the alarm information is not detected by the downstream after the service loopback is sent from the T port on the client side, it means that the client unit and the cross-connect unit are both If normal, the fault occurs inside the line unit; otherwise, it indicates that there is a fault in the customer unit or the cross-connect unit, and go to step 606;

Step 606, the network management system sends a loopback command to the backplane cross-connect system, instructing the service signal to perform the front-end loopback of the client-side system shown in Figure 4;

Step 607, the network management system judges whether it has received the alarm information from the detection point downstream of the T port on the client side. If the alarm information is not detected by the downstream after the service loopback is sent from the T port on the client side, it means that the client unit is normal and a fault occurs Inside the cross-connect unit, otherwise, it means that the client unit or the front-end of the cross-connect unit fails, go to step 608;

Step 608, the network management system sends a loopback command to the backplane cross-connect system, instructing the service signal to perform the front-end loopback of the client-side system shown in Figure 3;

Step 609, the network management system judges whether it has received the alarm information from the detection point downstream of the T port on the client side. If the alarm information is not detected by the downstream after the service is looped back and sent from the T port on the client side, it means that the client unit is normal and a fault occurs On the front end of the cross-connect unit, otherwise, it indicates that the front end of the client unit is faulty.

In the above step 605, if it is determined that the fault occurs in the line unit, the network management system may further instruct the service signal to perform the backend loopback of the client-side system as shown in FIG. 3 . If the service can be sent normally from the T port on the client side after loopback and no alarm is detected, it means that the front end of the line unit is normal and the back end of the line unit is faulty; otherwise, the front end of the line unit is faulty and the rear end of the line unit is normal.

It should be noted that although the above-mentioned process is described by taking the service whose transfer direction is client side→line side as an example, the processing method for the service whose transfer direction is line side→client side is similar, and the service signal is processed as shown in Figure 4/Figure 5. loop back or front end of the line-side system shown to determine the failed subsystem unit.

Embodiment three

In the third embodiment of the present invention, assuming that the embodiment determines that the client unit in Fig. 3 or Fig. 4 breaks down, as shown in Fig. 7, various functions inside the client unit are mainly controlled by Field Programmable Gate Array (Field Programmable Gate) Array, referred to as FPGA) to achieve, business processing mainly through the following frame structure or processing method: ordinary Ethernet data frame (GE) → general framing format (GFP) → OTN standard payload unit (ODU) → high-speed data bus signal (TFI), these processing modules are the realization points for realizing the internal loopback function of the unit.

Fig. 8 is a flow chart for further determining where the fault occurs inside the client unit when it is determined that the fault is located inside the client unit in Embodiment 3 of the present invention, which mainly includes the following steps:

Step 801, the network management system instructs the service signal to execute the G loopback in Figure 7;

Step 802, the network management system judges whether to receive the alarm information from the detection point downstream of the T port on the client side. If the alarm information is not detected by the downstream after the service is looped back and sent from the T port on the client side, it means that the GE processing module and GFP processing module and the ODU processing module are normal, and the fault occurs in the TFI processing module; otherwise, it means that the GE processing module, GFP processing module or ODU processing module is faulty, and go to step 803;

Step 803, the network management system instructs the service signal to execute the P loopback in Figure 7;

Step 804, the network management system judges whether to receive the alarm information of the detection point downstream of the T port on the client side, if the alarm is not detected by the downstream after the service loopback is sent from the T port on the client side, it means that the GE processing module and the GFP processing If the module is normal, the fault occurs in the ODU processing module; otherwise, it means that the GE processing module or the GFP processing module is faulty, and go to step 805;

Step 805, the network management system instructs the service signal to execute the F loopback in Figure 7;

Step 806, the network management system judges whether the alarm information from the detection point downstream of the T port on the client side has been received. If the alarm information is not detected by the downstream after the service is looped back and sent from the T port on the client side, it means that the GE processing module is normal and faulty. Occurs in the GFP processing module; otherwise, the GE processing module is faulty.

Embodiment four

Embodiment 4 of the present invention takes the distributed cross-connect mode of the backplane shown in FIG. 9 as an example, and uses the backplane provided in the embodiment of the present invention.

FIG. 10 is a flow chart of fault location in Embodiment 4 of the present invention, which mainly includes the following steps:

Step 1001, connect each subsystem unit as shown in Figure 9;

Step 1002, the cross line of a certain service is: client unit 1, cross subunit 1, cross subunit 2, line unit 2, and the detection point downstream of the T port of line unit 2 detects whether the service signal is normal;

Step 1003: After the above service signal is sent at the T port on the line side, it is detected that the service is invalid, and the detection point reports an alarm message;

Step 1004, the network management system instructs the service signal to execute the backend loopback of the client unit system on the line unit 2;

Step 1005, judging whether the business after the loopback can be normally sent from the T port of the client side and an alarm is detected, if not, it means that the cross-connect unit 1/2 and the client unit 1 are all normal, and it is determined that the fault is on the line unit 2; otherwise , indicating that the fault is at the front end of line unit 2, cross-connect unit 1, cross-connect unit 2 or customer unit, and proceed to step 1006;

Step 1006, the network management system instructs the service signal to execute the back-end loopback of the cross-connect unit system on the cross-connect unit 2 in the figure;

Step 1007, judging whether the service signal is detected as an alarm after the loopback, if not, it means that the fault occurs at the front end of the line unit 2; otherwise, it indicates that the fault occurs at the cross-connect unit 1, the cross-connect unit 2 or the customer unit, and proceed to step 1008;

Step 1008, the network management system instructs the service signal to execute the front-end loopback of the cross-connect unit system of cross-connect unit 1 in the figure;

Step 1009, if no alarm is detected for the service after the loopback, it means that the fault occurs at the rear side of cross-connect unit 1 or cross-connect unit 2. At this time, it is instructed to perform the front-end loopback of the cross-connect unit system of cross-connect unit 2. If the loopback is successful, then The cross-connect unit 2 has no fault, otherwise there is a fault on the cross-connect unit 2; otherwise, if an alarm is detected, it means that the fault occurs at the front end of the cross-connect unit 1 or the customer unit, and proceed to step 1010;

Step 1010, the network management system instructs the service signal to execute the client unit system front-end loopback of the client unit 1 in the figure;

Step 1011, if no alarm is detected for the service after the loopback, it means that the fault occurs at the back end of the client unit 1 or the cross-connect unit 1. At this time, the back-end loopback of the line unit system of the client unit 1 can be performed to determine whether the cross-connect unit 1 has a fault ; On the contrary, it means that the fault occurs in client unit 1.

Embodiment five

FIG. 11 is a fault location device for a backplane cross-connect system according to Embodiment 5 of the present invention. The device can be used as the above-mentioned network management system to implement the above-mentioned fault location method for the backplane cross-connect system. The device mainly includes: a receiving module 10 , a sending module 20 and a positioning module 30 . Wherein, the receiving module 10 is connected with the fault detection point, and is used to receive the alarm information from the detection point, and triggers the sending module 20; the sending module 20, is used to send an instruction service signal to the backplane cross-connect system to perform a loopback on the transmission line of the service signal The loopback command; the positioning module 30 is used to locate the faulty subsystem unit according to the execution result of the loopback. Specifically, the positioning module 30 can send the loopback command according to the sending module 20. To the alarm information to locate the faulty subsystem unit.

Preferably, the sending module 20 is also used to send a loopback command to the backplane cross system to indicate that the above-mentioned service signal executes a loopback on the module where the positioning module 30 locates the failed subsystem unit; Return the execution result to locate the faulty module on the subsystem unit.

From the above description, in the embodiment of the present invention, when the network management system receives the alarm information, it instructs the backplane cross-connect system to perform a loopback to locate the failed subsystem unit, thereby simplifying the fault location process and shortening the location time. It reduces the density of alarm detection points, saves equipment costs, and reduces the difficulty of fault location and maintenance costs.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. A method for fault location of a backplane crossover system, comprising: The network management system receives the alarm information indicating the failure of service signal transmission from the first detection point; The network management system sends a loopback command to the backplane cross-connection system to instruct the service signal to perform loopback on the transmission line of the service signal, and locates the faulty subsystem unit according to the execution result of the loopback. 2. The method according to claim 1, characterized in that, the network management system sends the loopback command, and positioning the failed subsystem unit according to the execution result of the loopback comprises: The network management system sends the loopback command to the backplane cross-connect system, and the loopback command instructs the service signal to perform loopback on the first loopback port on the transmission line; If the network management system receives the alarm information from the second detection point, the network management system determines that the fault occurs on the subsystem unit on the current loopback line; otherwise The network management system determines that the fault occurs on a subsystem unit outside the current loopback line of the backplane crossover system. 3. The method according to claim 2, characterized in that, after the network management system determines that the fault occurs on the subsystem unit on the current loopback line, the method also includes: Step 1, the network management system judges whether the number of subsystem units on the current loopback line is 1, if yes, then determine that the subsystem unit fails, otherwise, perform step 2; Step 2, the network management system sends a loopback command to the backplane cross-connect system indicating that the service signal is looped back at the second loopback port of the transmission line, wherein the second loopback port is located at the upstream of the first loopback port; Step 3, the network management system judges whether the alarm information from the second detection point has been received, if yes, the second loopback port is used as the first loopback port, and the step 1 is returned, otherwise, The network management system determines that the fault occurs on a subsystem unit between the first loopback port and the second loopback port. 4. The method according to claim 3, characterized in that, after the network management system determines that the fault occurs on a subsystem unit between the first loopback port and the second loopback port, the method Also includes: Step 4, the network management system judges whether the number of subsystem units between the first loopback port and the second loopback port is 1, if yes, then determine that the subsystem unit fails, otherwise, Execute step 5; Step 5, the network management system sends an instruction to the backplane cross-connection system to loopback the service signal at the loopback port between the first loopback port and the second loopback port, until according to the loopback The execution results identify the failed subsystem unit. 5. The method according to claim 2, characterized in that, after the network management system determines that the fault occurs on a subsystem unit outside the current loopback line of the backplane crossover system, the method further comprises: Step 1, the network management system judges whether the number of subsystem units outside the current loopback line is 1, if yes, then determine that the fault occurs on the subsystem unit, otherwise, perform step 2; Step 2, the network management system sends a loopback command to the backplane cross-connect system indicating that the service signal is looped back at a second loopback port on the transmission line, wherein the second loopback port is located at the downstream of the first loopback port; Step 3, the network management system determines whether the alarm information from the second detection point is received, if yes, the network management system determines that the fault occurs between the first loopback port and the second loopback port Otherwise, the network management system determines that a fault occurs on a subsystem unit outside the current loopback line, uses the second loopback port as the first loopback port, and returns to step 1. 6. The method according to claim 5, characterized in that, after the network management system determines that the fault occurs on a subsystem unit between the first loopback port and the second loopback port, the method Also includes: Step 4, the network management system judges whether the number of subsystem units between the first loopback port and the second loopback port is 1, if yes, then determine that the subsystem unit fails, otherwise, Execute step 5; Step 5, the network management system sends instructions to the backplane cross-connect system to perform loopback at the loopback port between the first loopback port and the second loopback port until the loopback is performed according to the loopback The execution results identify the failed subsystem unit. 7. The method according to any one of claims 3 to 6, wherein the first loopback port and the second loopback port are respectively located on two adjacent subsystem units. 8. The method according to any one of claims 2 to 6, wherein the loopback port through which the service signal is looped back is located at the entry point of the service signal in the subsystem unit of the backplane crossover system. ports and/or egress ports. 9. The method according to any one of claims 1 to 6, characterized in that, after the network management system determines the failed subsystem unit, the method further comprises: sending the network management system to the backplane The cross-connection subsystem sends one or more loopback commands, instructing the service signal to perform loopback at one or more modules inside the subsystem unit, until the faulty module is determined. 10. A fault location device for a backplane crossover system, comprising: A receiving module, configured to receive alarm information from a detection point; A sending module, configured to trigger when the receiving module receives the alarm information, and at the same time send a loopback command to the backplane cross-connect system indicating that the service signal is looped back on the transmission line of the service signal; The positioning module is configured to locate the faulty subsystem unit according to the execution result of the loopback. 11. The apparatus of claim 10, wherein: The sending module is further configured to send a loopback command to the backplane cross-connection system indicating that the service signal performs a loopback on the module where the positioning module locates the failed subsystem unit; The locating module is also used for locating the faulty module on the subsystem unit according to the result of the loopback execution.

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