WO2021093072A1 - Switching method and apparatus of olp transmission link, storage medium and olp - Google Patents

Abstract

A switching method and apparatus of an OLP transmission link of an optical fiber automatic switching protection system, a storage medium and an OLP. The method is used for at least one OLP in at least two OLPs connected in a cascading manner, and the least one OLP comprises a first input end used for receiving a first signal and a second input end used for receiving a second signal. The method comprises: obtaining first time information in which signal values of the first signal and the second signal are both less than respective first threshold values (S201); obtaining a first signal value of the first signal and a second signal value of the second signal within the period from the first time to the second time (S202); after a third time, at least obtaining a third signal value of the first signal (S203); and determining whether to switch the OLP from a first transmission link to a second transmission link according to the first signal value, the second signal value and the third signal value (S204).

Description

OLP transmission link switching method, device, storage medium and OLP

Cross-references to related applications

This application is based on a Chinese patent application with an application number of 201911118504.2 and an application date of November 15, 2019, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated by reference into this application.

Technical field

The present invention relates to optical fiber automatic switching protection system (Optical Fiber Line Auto Switch Protection Equipment, OLP for short) technology, and in particular to a switching method, device, storage medium and OLP of an OLP transmission link.

Background technique

As a system on the optical cable link, OLP has the characteristics of independent and transparent data transmission, high security, and fast failure recovery. It can cooperate with other equipment or devices in the optical network to build a non-blocking and high reliability , An optical communication network system that is safe, flexible, and capable of resisting disasters.

OLP has two transmission links, the main link and the backup link. OLP can use at least one of these two transmission links for optical signal transmission. OLP handover protection methods include 1+1 protection mode and 1:1 protection mode. Since the OLP switching speed of 1+1 protection mode is faster, this switching mode is more commonly used.

In an optical network in which at least two OLPs are connected in a cascaded manner, as shown in Fig. 1, a circuit diagram for cascading three OLPs. In the 1+1 protection mode, the primary link output terminal T1 of the previous stage OLP-OLP1 outputs the data (optical signal) received by the primary link input terminal R1, and uses the primary link to connect the primary link The data output by the output terminal T1 is transmitted to the main link input terminal R1 of the next stage OLP-OLP2. Among them, the main input terminal Rx of OLP1 needs to be connected to R1 through the optical switch unit (103) to send the data received by the main link input terminal R1 to the main link output terminal T1 inside the OLP1. Among them, each OLP is split by an optical splitter (101), divided into two optical signals, and output via T1 and T2 respectively. Among them, the Erbium Doped Fiber Amplifier (EDPA) (102) is used to amplify the optical signal to prevent excessive attenuation of the optical signal during transmission. It can be understood that, by default, all levels of OLP are used to transmit data step by step through the primary link, but it is worth noting that the backup link output terminal T2 of OLP1 also outputs light in the 1+1 protection mode. The signal is transmitted through the backup link and waits for OLP2 to receive it. When there is a link switching requirement in the previous-level OLP, if there is a failure, the previous-level OLP will perform the operation of switching from the active link to the backup link. The operation is: the optical switch unit (103) of the front-level OLP, such as OLP1, generates an operation to disconnect R1 and Rx, and connects another backup link input terminal R2 with Rx, and then the backup link input terminal R2 The received data is output via the backup link output terminal T2, and the backup link is used to transmit the data to the next level of OLP such as OLP2. However, in practical applications, when the previous-level OLP has a link switch, there will be a millisecond-level service interruption. The service interruption of the previous-level OLP such as OLP1 causes the receiving end of the primary link of the next-level OLP such as OLP2. R1 cannot present optical signals, and because the backup link of OLP1 is shorter than the main link or due to the difference in characteristics of EDFA (102), the optical signal transmitted from the backup link of OLP1 will reach OLP2 first. That is to say, in response to the interruption of OLP1’s services, the OLP2’s backup link input R2 will give priority to the optical signal of R1. In this case, the OLP2 optical switch unit (103 ) Will switch from R1 to R2, and switch the transmission link of OLP2 from the main link to the backup link. It can be understood that the switching of the transmission link in OLP2 is caused by the switching of the transmission link in OLP1, not due to its own reasons, such as the failure of its own main link. It is not expected in practical applications. OLP2 also switches as the transmission link of OLP1 switches. In the related art, this switching of the OLP2 transmission link is called an invalid switching. It can be seen that how to avoid invalid switching of the next-level OLP when the transmission link is switched in the previous-level OLP has become a technical problem that needs to be solved urgently.

Summary of the invention

In order to solve the existing technical problems, embodiments of the present invention provide an OLP transmission link switching method and device, computer storage medium, and OLP.

The technical solution of the embodiment of the present invention is realized as follows:

An embodiment of the present invention provides an OLP transmission link switching method, including: for at least one OLP of at least two OLPs connected in a cascade manner, the at least one OLP includes a first signal for receiving a first signal. An input terminal and a second input terminal for receiving the second signal;

Obtaining first time information in which signal values of the first signal and the second signal are both smaller than the respective first threshold;

In the first time to the second time, the first signal value of the first signal and the second signal value of the second signal are obtained; wherein the second time is determined by the second input terminal The time when the received signal value of the second signal reaches the first threshold set for the second signal;

After the third time, at least the third signal value of the first signal is obtained, where the third time is the value of the first signal from the first threshold set for the first signal after the second time Time information when the second threshold is reached;

According to the first signal value, the second signal value, and the third signal value, it is determined whether to switch the OLP from the first transmission link to the second transmission link.

An embodiment of the present invention also provides an OLP transmission link switching device. The device includes: a first acquisition module, a second acquisition module, a third acquisition module, and a determination module; the OLP includes a device configured to receive a first signal The first input terminal and the second input terminal configured to receive the second signal; wherein,

The first acquiring module is configured to acquire first time information whose signal values of the first signal and the second signal are both smaller than the respective first threshold;

The second acquisition module is configured to acquire the first signal value of the first signal and the second signal value of the second signal during the first time to the second time; wherein the second time Is the time when the signal value of the second signal received by the second input terminal reaches the first threshold set for the second signal;

The third acquisition module is configured to acquire at least a third signal value of the first signal after a third time, where the third time is the value of the first signal after the second time Time information when the first threshold set for the first signal reaches the second threshold;

The determining module is configured to determine whether to switch the OLP from the first transmission link to the second transmission link according to the first signal value, the second signal value, and the third signal value.

The embodiment of the present invention also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the steps of any of the methods are implemented.

The embodiment of the present invention also provides an OLP including a memory, a processor, and a computer program stored on the memory and capable of running on the processor, and the processor implements the steps of any of the methods when the program is executed.

An OLP transmission link switching method, device, computer storage medium, and OLP provided in the embodiments of the present invention, wherein the switching method includes: for at least one OLP of at least two OLPs connected in a cascade manner, The at least one OLP includes a first input terminal for receiving a first signal and a second input terminal for receiving a second signal; Time information; in the first time to the second time, the first signal value of the first signal and the second signal value of the second signal are obtained; wherein the second time is determined by the second signal The time when the signal value of the second signal received by the input terminal reaches the first threshold set for the second signal; after the third time, at least the third signal value of the first signal is obtained, wherein the third signal value is Time is the time information for the value of the first signal to reach the second threshold from the first threshold set for the first signal after the second time; according to the first signal value and the second signal value, and The third signal value determines whether to switch the OLP from the first transmission link to the second transmission link.

In the embodiment of the present application, it is determined whether to switch the transmission link of the OLP according to the first signal value, the second signal value, and the third signal value. At least it can prevent the cascaded OLP from being ineffectively switched due to the switching of the previous OLP.

In addition, the first signal value and the second signal value are obtained from the first time to the second time, and the third signal value is obtained after the third time, so that the conditions for switching are more stringent and invalid switching is greatly avoided.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present invention or related technologies, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or related technologies. Obviously, the accompanying drawings in the following description are merely the present invention. For the embodiments of the invention, for those of ordinary skill in the art, other drawings may be obtained based on the provided drawings without creative work.

Figure 1 is a schematic diagram of the circuit configuration of a cascaded OLP in the related art;

2 is a schematic diagram of the implementation process of the first embodiment of the OLP transmission link switching method provided by the present invention;

3 is a schematic diagram of the implementation process of the second embodiment of the OLP transmission link switching method provided by the present invention;

4 is a schematic diagram of the implementation process of the third embodiment of the OLP transmission link switching method provided by the present invention;

5 is a schematic diagram of the principle of whether the OLP transmission link is switched according to an embodiment of the present invention;

6 is a schematic diagram of the composition structure of an OLP transmission link switching apparatus provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of the hardware structure of an OLP provided by an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present application clearer and clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only These are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention. In the case of no conflict, the embodiments in the application and the features in the embodiments can be combined with each other arbitrarily. The steps shown in the flowcharts of the drawings can be executed in a computer system such as a set of computer-executable instructions. And, although a logical sequence is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than here.

The embodiment of the present invention provides an OLP transmission link switching method, which is applied to at least one OLP of at least two OLPs connected in a cascade manner, and the at least one OLP includes a first signal for receiving a first signal. An input terminal and a second input terminal for receiving the second signal. It can be understood that each OLP connected in a cascade manner includes two input terminals: a first input terminal and a second input terminal. The first input end can be understood as the receiving end that receives the optical signal transmitted by the previous OLP through the main link. The second input end can be understood as the receiving end that receives the optical signal transmitted by the previous OLP through the backup link. Of course, the reverse is also possible. Each OLP includes a first transmission link and a second transmission link. In the case where the first transmission link is the active link, the second transmission link refers to the standby link; the first transmission link is In the case of a backup link, the second transmission link refers to the main link.

As shown in Figure 2, the OLP transmission link switching method in the embodiment of the present application includes:

Step (S) 201: Obtain first time information in which the signal values of the first signal and the second signal are both smaller than the respective first thresholds;

S202: Obtain a first signal value of the first signal and a second signal value of the second signal during the first time to the second time; wherein the second time is determined by the second input The time when the signal value of the second signal received by the terminal reaches the first threshold set for the second signal;

S203: Obtain at least a third signal value of the first signal after the third time, where the third time is the value of the first signal from the first signal set for the first signal after the second time Time information when a threshold reaches a second threshold;

S204: Determine whether to switch the OLP from the first transmission link to the second transmission link according to the first signal value, the second signal value, and the third signal value.

The main body of executing S201 to S204 is OLP.

In S201, a first threshold is set for each of the first signal and the second signal. The first threshold may be a specific value or a range of values, which is not specifically limited. The first threshold of the two signals may be the same or different in value. Obtain a piece of time information (first time information), which is the time when the signal values of the first signal and the second signal are both smaller than the respective first thresholds. It can be understood that when the two signals are synchronized, this time information may be the time when the two signals are less than the respective first threshold values at the same time. In the case where the two signals are not synchronized, this time information can be the time when the last signal is less than its first threshold. The first time information can be a specific time or a duration, depending on the actual usage.

In S202, the signal values of the first signal and the second signal are acquired during the period of time from the first time to the time when the signal value of the second signal reaches the first threshold (the second time).

In S203, wait for the arrival of the time (the third time) when the value of the first signal reaches the second threshold from the first threshold after the second time, and after the arrival of the third time, perform the signal value of the first signal again Obtain.

In S204, it is determined whether to switch the OLP transmission link according to the two signal values of the first signal and the signal value of the second signal obtained in the foregoing several times.

In summary, in the embodiment of the present application, the first time information is obtained, the signal values of the first signal and the second signal are obtained from the first time to the second time, and after the third time, at least The value of the first signal is acquired again, and the signal value of the first signal and the second signal acquired from the first time to the second time and the signal value of the first signal acquired after the third time are used to determine whether Switch the transmission link of OLP. It can be understood that the embodiment of the present application is equivalent to two signal values of the first signal and one signal value of the second signal acquired within a specified time (eg, the first time to the second time, and after the third time) , To determine whether to perform OLP transmission link. This solution of whether to switch the transmission link based on the signal value acquired within the specified time can at least avoid the invalid switching of the OLP of the current level caused by the switch of the previous OLP.

This application provides another embodiment of an OLP transmission link switching method. As shown in FIG. 3, the method includes:

S301: Obtain first time information in which the signal values of the first signal and the second signal are both smaller than the respective first threshold values;

S302: Obtain a first signal value of the first signal and a second signal value of the second signal during the first time to the second time; wherein the second time is determined by the second input The time when the signal value of the second signal received by the terminal reaches the first threshold set for the second signal;

S303: Obtain at least a third signal value of the first signal after the third time, where the third time is the value of the first signal from the first signal set for the first signal after the second time Time information when a threshold reaches a second threshold;

S304: Judging the magnitude relationship between the first signal value and the second signal value and the respective first thresholds to obtain a first judgment result;

S305: Judging the magnitude relationship between the third signal value and the second threshold value to obtain a second judgment result;

S306: Determine whether to switch the OLP from the first transmission link to the second transmission link according to the first judgment result and the second judgment result.

The subject of S301 to S306 is OLP. For the implementation process of S301 to S303, please refer to the relevant description of S201 to S203, and the repetition will not be repeated. The foregoing S304 to S306 serve as a specific implementation of the foregoing S204. Among them, S304 and S305 have no strict sequence, and they can also be carried out at the same time.

In the foregoing solution, the first time information is obtained, the signal values of the first signal and the second signal are obtained from the first time to the second time, and after the third time, at least the value of the first signal is obtained Get it again. According to the judgment result of the magnitude relationship between the first signal value and the second signal value and the respective first threshold value, and the judgment result of the magnitude relationship between the third signal value and the second threshold value, it is determined whether to perform the OLP transmission link Switch. The solution of the embodiment of the present application is equivalent to stipulating when the first signal and the second signal value are acquired on the one hand, and on the other hand, it is based on the relationship between the signal value obtained within the specified time and the corresponding threshold value. The result of the judgment is to determine whether to switch the transmission link, so that the signal value acquisition time and the conditions for whether the switch occurs become more rigorous. This more rigorous solution can greatly avoid the current level caused by the switch of the previous OLP An invalid handover occurred in OLP.

In an embodiment, S306: the determining whether to switch the OLP from the first transmission link to the second transmission link according to the first judgment result and the second judgment result may be implemented in one of the following ways :

Manner 1: The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first threshold values, and the second judgment result indicates that the third signal value is greater than or equal to the second In the case of a threshold, control the OLP to maintain the first transmission link.

Manner 2: The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first threshold value, and the second judgment result indicates that the third signal value is smaller than the second threshold value In the case of controlling the OLP to switch from the first transmission link to the second transmission link.

It can be understood that the first method is a situation where transmission link switching does not occur; the second method is a situation where transmission link switching occurs. In the first and second methods, that is, whether switching occurs or does not need to occur, the first judgment result is characterized as the first signal value and the second signal value are both smaller than the respective first threshold values, and the difference is that the third signal value is different from the The magnitude relationship of the second threshold. If the second judgment result is characterized as that the third signal value is greater than or equal to the second threshold, there is no need to switch and maintain the OLP in the first transmission link. If the second judgment result is characterized as that the third signal value is less than the second threshold, then it is necessary to switch from the first transmission link to the second transmission link. According to the magnitude relationship between the signal values of the first and second signals and the corresponding thresholds, and combining the two judgment results to determine whether to switch the transmission link, the scheme is more rigorous and can effectively avoid the switch due to the previous OLP As a result, invalid handover occurs in the OLP at this level, which avoids no handover that should not happen.

In the foregoing solution, the process is performed based on the first signal value of the first signal, the second signal value of the second signal, and the third signal value of the first signal, that is, two values of the first signal and one value of the second signal. Determine whether to switch the transmission link. In addition, if the third signal value of the first signal obtained after the third time is less than the second threshold, there is a small possibility that the second transmission link will fail. When the cascaded OLP is switched, it will switch from the first transmission link to the failed second transmission link. To ensure that such invalid switching does not occur, in one embodiment, the switching method further includes:

After the third time, obtain the fourth signal value of the second signal;

Judging the magnitude relationship between the fourth signal value and the third threshold, and obtaining a third judgment result;

Correspondingly, the determining whether to switch the OLP from the first transmission link to the second transmission link according to the first judgment result and the second judgment result includes:

According to the first judgment result, the second judgment result, and the third judgment result, it is determined whether to switch the OLP from the first transmission link to the second transmission link.

It can be understood that in the foregoing solution, after the third time, the signal value of the second signal is also acquired again, and in the process of determining whether to switch the transmission link, in addition to applying the first and second determination results, The third judgment result of judging the magnitude relationship between the fourth signal value and the third threshold value is added, and the determination of whether the transmission link is switched is determined by the combination of the three judgment results of the first to third judgment results. It is equivalent to the aforementioned scheme of whether the transmission link is switched based on the first and second judgment results. This scheme makes the switching conditions more stringent, so that it can accurately determine whether it should be switched, so that the judgment of switching or not switching can be more accurate and avoid An invalid handover occurred in this level of OLP.

In an embodiment, the determining whether to switch the OLP from the first transmission link to the second transmission link according to the first judgment result, the second judgment result and the third judgment result may be through one of the following Ways to achieve:

Manner 1: The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first threshold values, and the second judgment result indicates that the third signal value is greater than or equal to the second The threshold and the third judgment result indicate that when the fourth signal value is less than the third threshold, the OLP is controlled to maintain the first transmission link.

Manner 2: The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first threshold values, and the second judgment result indicates that the third signal value is greater than or equal to the second The threshold and the third judgment result indicate that when the fourth signal value is greater than or equal to the third threshold, the OLP is controlled to maintain the first transmission link.

Manner 3: The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first threshold value, and the second judgment result indicates that the third signal value is smaller than the second threshold value And when the third judgment result indicates that the fourth signal value is greater than or equal to a third threshold, control the OLP to switch from the first transmission link to the second transmission link.

Manner 4: The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first threshold value, and the second judgment result indicates that the third signal value is smaller than the second threshold value And when the third judgment result indicates that the fourth signal value is less than a third threshold, control the OLP to maintain the first transmission link.

It can be understood that the first and second modes are the normal operation of the first transmission link without the occurrence of transmission link switching, and there is no need to consider the working status of the second transmission link; the third mode is that the first transmission link is not working normally and the second transmission link is not working properly. The normal operation of the transmission link requires a transmission link switching situation; the fourth method is to avoid the second transmission link failure without the transmission link switching situation.

It can be understood that in the first and second modes, when the first signal value and the second signal value are both less than their respective first thresholds, it is only necessary to switch whether the third signal value is greater than or equal to the second threshold. Still don't switch the determination of the transmission link, without worrying about the value of the fourth signal value. In the third and fourth modes, when the third signal value is less than the second threshold value, it is also necessary to combine the magnitude relationship between the fourth signal value and the third threshold value to determine whether to switch or not to switch.

In methods 1, 2, 3, and 4, that is, whether switching occurs or does not need to occur, the first judgment result is characterized as that the first signal value and the second signal value are both smaller than the respective first thresholds, and the difference is that the first The magnitude relationship between the three-signal value and the second threshold and the magnitude relationship between the fourth signal value and the third threshold. If the second judgment result indicates that the third signal value is greater than or equal to the second threshold, there is no need to switch the transmission link and control the OLP to maintain the first transmission link. If the second judgment result indicates that the third signal value is less than the second threshold value and the third judgment result indicates that the fourth signal value is greater than or equal to the third threshold value, then the switching of the transmission link needs to occur. If the second judgment result indicates that the third signal value is less than the second threshold and the third judgment result indicates that the fourth signal value is less than the third threshold, there is no need to switch the transmission link and control the OLP to maintain the first transmission chain Way to avoid invalid switching caused by the failure of the second transmission link. Through the acquisition of the respective two signal values of the first signal and the second signal at different specified times, and the determination of the relationship with the corresponding threshold value, it is determined whether the switching of the transmission link occurs, which can greatly avoid the occurrence of invalid OLP at this level. Switch.

The technical solutions of the embodiments of the present application will be further described below with reference to the principle diagram shown in FIG. 1, Table 1, and FIGS. 4 to 5.

Each OLP connected in a cascade manner in the embodiment of the present application includes at least three input terminals (Input) and three output terminals (Output). The definition of each input terminal and output terminal is shown in Table 1. Wherein, the first signal is the main service optical signal, the second signal is the backup service optical signal; the first input terminal R1 is the main service input port, and the second input terminal R2 is the backup service input Port, the total receiving port Rx is a light-receiving port connected to service signals, the total output port Tx is a light-emitting port connected to service signals, the first output port T1 is the main service output port, and the second output Port T2 is a backup service output port.

Table 1

Take the three OLP cascade circuits shown in Figure 1 as an example, the waveforms of R2, R1, and Rx are shown in Figure 5. In conjunction with Fig. 1 and Fig. 5, an in-depth description of the process of invalid switching of the current level of OLP such as OLP2 due to the switching of the previous-level OLP such as OLP1 in the related art is given. Those skilled in the art should know that since the backup link of the OLP at all levels is shorter than the primary link, after the period of service interruption of OLP1 due to handover, the optical signal of the backup link of OLP1 precedes the primary link. When the optical signal appears, the R2 input terminal of the next OLP of OLP1, namely OLP2, will receive the optical signal first. At this time, there will be a situation where the R1 input of OLP2 has no optical signal and the R2 input has an optical signal (during the ta period in Figure 5), OLP2 will control the optical switch unit (103) to disconnect R1 and Rx, Connecting R2 and Rx leads to an invalid switch of OLP2. For the convenience of description, remember that the time for generating this switching operation is t3. It can be seen from Figure 5 that Rx generates a rising edge signal at t3. The reason for the rising edge signal is that Rx was originally connected to R1. Because the switching of OLP1 causes the service signal to be interrupted, it switches to R2, which receives the optical signal first. It can be understood that in the related art, when the OLP1 has service interruption due to its handover, as long as a stable optical signal appears on R2 (R1 and R2 both appear slowly and tend to be stable), the handover of the invalid link occurs.

The foregoing solution can be understood as measuring the waveforms of interfaces R1, R2, and Rx during OLP2 switching caused by OLP1 switching in a scenario where there is invalid switching of OLP2. Among them, the waveforms of the R1 and R2 interfaces are simplified waveforms, and the waveforms of the Rx interface are idealized square waves. Among them, when the waveform of the Rx interface has a falling edge, it indicates that the service is interrupted, and when the waveform of the Rx interface has a rising edge, it indicates that the optical switch unit (103) is disconnected from the connection between Rx and R1 and then switched to connect with R2. That is to say, the above content is to analyze the reasons for invalid switching in the scene where there is invalid switching in OLP2. In the embodiment of the present application, the rule in the scene of invalid handover is used to avoid the occurrence of invalid handover.

In the process of realizing this solution, the inventor found that R2 and R1 have a certain time interval from the interruption of OLP1's business to the occurrence. The time interval is measured multiple times in advance, and the reasonable value of this time interval is estimated. Recorded as ta. There is a certain time interval between the time when Rx disconnects from R1 and then connects with R2 and the time when the optical signal of R1 tends to stabilize. Perform multiple measurements of this time interval in advance, and estimate the reasonable value of this time interval. Value, and denoted as tb. At the same time, pre-measure the time interval from the time when R1 and R2 cannot receive the optical signal due to the interruption of OLP1 service to the time when Rx disconnects from R1 and then connects to R2, and perform multiple measurements of this time interval in advance. , And estimate the reasonable value of this time interval, and record this time interval as t0. It can be understood that the time intervals ta, tb, and t0 are all time interval values, which can be a specific value or a range value, which is not specifically limited.

With reference to Figure 4 and Figure 5, the technical solution in this application scenario will be described.

S401: By default, OLP1 uses the main and backup channels for optical signal transmission, OLP2 uses input R1 to receive optical signals transmitted by OLP1 through the main channel, and input R2 to receive optical signals transmitted by OLP1 through the backup channel .

It can be understood that in the 1+1 protection mode of OLP, the Rx of OLP1 is connected to its R1 through the optical switch unit (103), the optical signal input to OLP1 by the external device is received by R1 of OLP1, and the received optical signal passes through Rx and Tx. It splits light with the splitter to obtain two output signals, one of which is output through the T1 output terminal and transmitted to R1 of OLP2 through the main link of OLP1. The other is output via the T2 output terminal and transmitted to R2 of OLP2 via the backup link of OLP1. Those skilled in the art should know that since the Rx of the OLP2 is connected to the input terminal R1 and not connected to the R2, the optical signal received by the OLP2 is the optical signal input from the R1. The optical signal appearing on the input of R2 is the optical signal transmitted by the backup link of OLP1. Since Rx of OLP2 is not connected to R2, the signal received at the input of R2 is saved first.

S402: During the process of OLP2 receiving the optical signal, monitor the magnitude of the optical signal received on R1 and R2;

In this step, the optical signal on the primary link from OLP1 (primary service optical signal) received by R1 and the optical signal on the backup link from OLP1 (backup service optical signal) received by R2 ) To monitor. It can be understood that the size of the optical signal is specifically the optical power value of the optical signal.

S403: Record the time information (first time information) that at least the last optical signal of the primary service optical signal and the backup service optical signal is less than the first threshold set for it, and record the first time as Ti;

Here, when OLP1 does not have a transmission link failure, the input end of OLP2 will both receive the main service optical signal and the standby service optical signal whose optical power values are within a stable range. Once OLP1 has a transmission link failure and needs to be switched from the main link to the backup link, during the time when the OLP1 service is interrupted, the input terminal of OLP2 will not receive optical signals or receive very small optical signals, preferably No light signal is received. That is, once it is detected that the optical signal of the main service input by R1 is less than the first threshold (such as 0dBm) set for it, it is considered that a fault has occurred. The fault may be caused by the transmission link of the previous OLP such as OLP1. It is caused by the temporary interruption of handover and service transmission, which may also be caused by the failure of R1. Here, considering that the two input terminals of the OLP2 may receive their respective optical signals synchronously, or may not receive synchronously, synchronous reception is preferred. In terms of technical implementation, if it is detected that the optical signal input by which input terminal is less than the first threshold value set for it, the time information that is less than the first threshold value is recorded for that input terminal, and then two input terminals are recorded for two input terminals. Such time information. From the two recorded time information, the information with the later time is selected as the first time information in the embodiment of the present application.

In FIG. 5, it is assumed that the two time information recorded by OLP2 are the same, and both are at time Ti.

It should be noted that the first threshold set for the primary service optical signal and the standby service optical signal can be a specific value or a range value. The two first thresholds can be the same or different, depending on actual usage. Flexible settings. From the measurement to the moment Ti, OLP2 starts timing.

S404: In the time period from Ti to (t0-ta), measure the magnitude of the optical signal received by R1 and R2 of OLP2;

Among them, ta is the pre-estimated possible time for the standby service optical signal input by R2 to reach the first threshold from the first threshold value less than itself; t0 is the time from the interruption of the service of OLP1 to the disconnection of Rx from OLP2 and the connection to R2. Therefore, the time period t0-ta can be regarded as the result of the pre-measurement result, which is caused by the interruption of OLP1 service. The R1 and R2 input terminals cannot receive optical signals or the received optical signals are very small. duration.

S405: Determine the magnitude relationship between the optical signals received by R1 and R2 of OLP2 measured in the time period from Ti to (t0-ta) and the first threshold set for each;

If it is determined that both are less than the respective first threshold, continue to execute the following process;

Otherwise, switch according to normal logic. The switch according to the normal logic is: if the measured optical signal value received by R1 is greater than or equal to the second threshold value set for it, then OLP2 continues to receive the optical signal of R1 and continues to use the optical signal received by the main link. The signal is transmitted to the next level of OLP such as OLP3 through the main link. If the measured optical signal value received by R1 is less than the first threshold set for it and the measured optical signal value received by R2 is greater than or equal to the third threshold set for it, then OLP2 will disconnect R1 and Rx. The connection between them continues to connect R2 and Rx to switch OLP2 from the original main link to the backup link and transmit the received optical signal to OLP3 through the backup link. If the measured R1 is greater than or equal to the second threshold and the optical signal of R2 is greater than or equal to the third threshold set for it, then OLP2 does not switch and continues to use the primary link to transmit the optical signal received by R1 to OLP3.

It should be noted that in the time period from time Ti to Ti+(t0-ta), the measurement of the optical signals received by R1 and R2 may be one or multiple times. In the case of one measurement, the optical signal can be measured at any time within the time period from time Ti to time Ti+(t0-ta); it is also possible to set a (preferred) measurement time point in advance and measure at (preferred) The optical signal is measured when the time point arrives. For example, the intermediate time point of the time period from time Ti to Ti+(t0-ta) can be taken as the aforementioned (preferred) measurement time point, and it is measured when this (preferred) measurement time point arrives. The signal values of the two input terminals. For situations where multiple measurements are required, the optical signal can be measured at any two or more times within the time period from time Ti to time Ti+(t0-ta), and the measurement results at each time are averaged as the final The optical signal value that can be compared with the respective first threshold value. It is also possible to select any one of the multiple measurement results as the optical signal that can be finally compared with the respective first threshold. In practical applications, since the main body of the solution that executes the foregoing steps is OLP2, and specifically OLP2 processors such as MCUs, MCUs usually have a certain sampling frequency. For multiple measurements, at time Ti to Ti+(t0-ta) The frequency of multiple measurements during this time period is preferably less than the sampling frequency of the MCU. In the embodiments of the present application, whether a single measurement or multiple measurements is adopted, the specific conditions can be flexibly set according to actual applications.

In the foregoing solution, t0, ta, and tb are obtained by pre-measurement and estimation before executing the solution of the embodiment of the present application, such as before performing S401. In addition, t0, ta, and tb can also be measured and estimated during the execution of the solution. Information such as the measurement of the optical signal value at the input terminal and the measurement time corresponding to each measurement value is obtained. Specifically, the optical signal values of R1 and R2 are measured at a preset frequency of multiple measurements (less than the sampling frequency of the MCU), and the signal values of a certain amount of R1 and R2 and the corresponding time points can be recorded. Set the time period from time Ti to the time when R2 is detected to work normally (at least the state of R2 when the optical signal value reaches the first threshold) as t0; it is detected that the optical signal value of R1 measured for the first time is less than its first Threshold and the optical signal value of R2 is greater than or equal to its first threshold and the time period between when the signal value of R2 is detected to be greater than or equal to its third threshold is denoted as ta; the signal value of R2 is detected The time period between the time point when it is greater than or equal to its third threshold and the time point when the signal value of R1 is greater than or equal to its second threshold value is denoted as tb. That is, t0, ta, and tb are calculated according to the change of the optical signal in a certain amount of data recorded and the time point corresponding to the change. When t0, ta, and tb are calculated, the second time information and the third time information can be calculated reasonably. Whether t0, ta, and tb in the embodiments of the present application are estimated in advance or calculated in real time according to the measured optical signal changes and the time information corresponding to the changes during the execution of the scheme, there is no specific limitation , According to the actual situation.

S406: OLP2 starts timing from 0 at the time Ti, and when timing reaches the time (Ti+t0+tb), after the time (Ti+t0+tb), measure the optical signal received by R1 of OLP2;

In this step, tb is the length of time between the time when Rx is disconnected from R1 and then connected to R2 and the time when the optical signal of R1 stabilizes, that is, when Rx is disconnected from R1 and then connects with R2 to R1, the optical signal recovers. The period of time; among them, pre-measure the size of the signal when R1 becomes stable, and set the second threshold to the reasonable value of the signal size when the measured R2 becomes stable, such as -2dBm.

S407: Determine the magnitude relationship between the optical signal received by the measured R1 of OLP2 after the moment (Ti+t0+tb) and the second threshold;

If it is determined that the optical signal received by R1 is greater than or equal to the second threshold, step S408 is executed;

If it is determined that the optical signal received by R1 is lower than the second threshold, step S409 is executed;

It should be noted that the measurement of the optical signal received by R1 of OLP2 after the moment of (Ti+t0+tb) may be multiple times or once. In the case of multiple times, which measurement result is taken as the final result of the optical signal received by R2 can be found in the aforementioned measurement result of the optical signal received by R1 and R2 during the period from time Ti to time (t0-ta). The similar treatment is omitted here.

S408: Control OLP2 to maintain the transmission of service optical signals on the primary link;

S409: Control the OLP2 to switch from the main link to the backup link to perform service optical signal transmission.

The execution subject of the foregoing S401 to S409 may all be OLP2, specifically an OLP2 processor such as an MCU.

In the foregoing scheme, it is equivalent to breaking the scheme in the related art that the transmission link switching occurs when OLP2 starts timing from 0 and timing to the arrival of t0, that is, when the optical signal first appears in R2. In the embodiment of this application, the time from Ti to ( t0-ta) In this time period, the optical signals received by R1 and R2 of OLP2 shall be measured at least once, that is, the first measurement needs to occur in the time period from Ti to (t0-ta). After (Ti+t0+tb), the optical signal received by R1 of OLP2 is measured at least once. That is, the second measurement occurs after the moment (Ti+t0+tb). The results measured in these two time periods are compared with their respective thresholds, and according to the comparison results, it is determined whether to switch the transmission link. It can be regarded as judging based on the comparison result whether the input of OLP2 did not receive the signal due to the failure of the input terminal or the switching of the transmission link of OLP1. If it is caused by the switching of the transmission link of OLP1, then OLP2 There is no need to control the transmission link. If it is not caused by the switching of the transmission link in OLP1, in order to ensure the normal transmission of the optical signal between all levels of OLP, the OLP2 transmission link needs to be switched. In turn, invalid switching of OLP2 can be avoided. In addition, in order to improve the accuracy, the embodiment of the present application is equivalent to specifying the time information of the measurement signal, and based on the judgment result of the size of the optical signal measured in the specified time period and the respective threshold value, whether to determine the transmission link is performed Switching makes the switching conditions more stringent and can effectively avoid invalid switching.

In the foregoing solution, after the time (Ti+t0+tb), the description is based on the judgment result of the optical signal received by R1. To ensure accuracy, the optical signal received by R2 can also be measured after the time (Ti+t0+tb). And combined with the magnitude relationship between the measurement result of R2 and the third threshold, whether to switch the transmission link. Specifically, if the optical signal received by R1 measured after the moment (Ti+t0+tb) is greater than or equal to the second threshold, the OLP2 transmission link is not switched, and the optical signal is still maintained on the primary link. transmission. If the optical signal received by R1 measured after the moment (Ti+t0+tb) is less than the second threshold and the optical signal received by R2 is greater than or equal to the third threshold, control OLP2 to be transmitted from the primary link to the backup link.

If the optical signal received by R1 measured after the moment (Ti+t0+tb) is less than the second threshold and the optical signal received by R2 is less than the third threshold, the optical signal transmission is still maintained on the main link. Among them, the third threshold can be regarded as the reasonable value of the optical signal received by R2 when the pre-measured R2 signal starts from the interruption of the service of OLP1, which does not appear or appears very small, to when the optical signal appears and the optical signal is stable. The third threshold is -3dBm. Among them, the measurement of R1 and R2 may be performed at the same time or at different times, and it is preferably performed at the same time. The foregoing is equivalent to combining the optical signal received by R2 measured after the time (Ti+t0+tb) with the corresponding threshold judgment result to determine whether to switch the transmission link, making the switching conditions more stringent and greatly avoiding judgment errors. Circumstances, it can effectively identify whether the two input terminals of OLP2 have no optical signal during the time period from Ti to (t0-ta) or whether the small optical signal is caused by the service interruption of the previous stage OLP1. Realize the effective switching of OLP2 and avoid invalid switching.

It can be understood that the aforementioned t0, ta, and tb may be numerical ranges or specific numerical values, which are not specifically limited. In one embodiment, it is a numerical range, for example, t0 is 50ms (milliseconds), ta is 20ms, and tb is 8ms. In order to accurately determine whether to switch the transmission link, in theory, the time for measuring the optical signals received by R1 and R2 should be controlled between the first time and the second time, that is, the time period when t0 and ta do not overlap. In addition, in order to determine whether the main circuit can resume normal operation, at least the time point of the re-measurement of R1 needs to occur after the third time, that is, after the tb time period; in this way, it can be greatly identified between the first time and the second time. Whether there is no optical signal or very small optical signal between R1 and R2 is caused by the business interruption of the previous stage OLP1 or caused by the failure of the input terminals of R1 and R2, and then the effective switching of the OLP2 transmission link can be realized , To avoid invalid switching.

It can be understood that the aforementioned first threshold, second threshold, and third threshold are absolute thresholds. According to the first threshold, second threshold, and third threshold, determining whether OLP2 is switched from the main link to the backup link is a kind of absolute threshold. How to switch the threshold. In an embodiment, the first threshold, the second threshold, and the third threshold may also be a switching method based on a relative threshold. According to the first threshold, the second threshold, and the third threshold, it is determined whether OLP2 is switched from the main link. To the backup link, in this way, the first threshold, the second threshold, and the third threshold can be selected within a suitable numerical range, and the unit is dB. The switching method of the absolute threshold is specifically that the signal value of the first signal and the signal value of the second signal are compared with the respective set thresholds to obtain the judgment result, and it is determined whether to perform the first transmission link to the second transmission link. Switch; the relative threshold mode is that the difference between the signal value of the first signal and the signal value of the second signal is compared with the set thresholds to obtain the judgment result, and it is determined whether to execute the first transmission link to the second transmission link Switch.

It can be understood that in the foregoing solution, the optical signal received by R1 is the main service optical signal, the optical signal received by R2 is the standby service optical signal, the first transmission link is the main link, and the second transmission link is the main service optical signal. Take the backup link as an example. In addition, you can also predefine: the optical signal received by R2 is the main service optical signal, the optical signal received by R1 is the backup service optical signal, and the second transmission link is the main service optical signal. The link and the first transmission link are backup links. Those skilled in the art should know that any reasonable changes and modifications fall within the protection scope of the embodiments of the present invention.

Those skilled in the art should understand that, in theory, each OLP connected in a cascade manner can adopt the switching method in the embodiment of the present application to avoid invalid switching of the OLP. In practical applications, for the first OLP connected in a cascaded manner, since there is no other OLP connected to it in the previous stage, there will be no invalid handover, and there is no need to avoid invalid handover.

An OLP transmission link switching device provided by an embodiment of the present invention, as shown in FIG. 6, further includes:

The first acquiring module 61, the second acquiring module 62, the third acquiring module 63, and the determining module 64; the OLP includes a first input terminal 61a configured to receive a first signal and a second input terminal configured to receive a second signal 61b; where,

The first acquiring module 61 is configured to acquire first time information in which the signal values of the first signal and the second signal are both smaller than the respective first threshold;

The second acquisition module 62 is configured to acquire the first signal value of the first signal and the second signal value of the second signal during the first time to the second time; wherein the second signal Time is the time when the signal value of the second signal received by the second input terminal reaches the first threshold set for the second signal; and

The third acquiring module 63 is configured to acquire at least a third signal value of the first signal after a third time, where the third time is the value of the first signal after the second time Time information when the second threshold is reached;

The determining module 64 is configured to determine whether to switch the OLP from the first transmission link to the second transmission link according to the first signal value, the second signal value, and the third signal value .

In the above solution, the determining module 64 is configured to:

Judging the magnitude relationship between the first signal value and the second signal value and the respective first thresholds to obtain a first judgment result; and

Judging the magnitude relationship between the third signal value and the second threshold to obtain a second judgment result;

According to the first judgment result and the second judgment result, it is determined whether to switch the OLP from the first transmission link to the second transmission link.

In the above solution, the determining module 64 is further configured to:

The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first threshold value, and the second judgment result indicates that the third signal value is greater than or equal to the second threshold value Next, control the OLP to maintain the first transmission link;

In the case where the first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first threshold value, and the second judgment result indicates that the third signal value is smaller than the second threshold value , Controlling the OLP to switch from the first transmission link to the second transmission link.

In one solution, the third signal value of the first signal obtained after the third time is less than the second threshold, there is a small possibility that the second transmission link will fail, and then the cascaded OLP will be switched. It will switch from the first transmission link to the failed second transmission link. To ensure that such invalid switching does not occur, the device further includes:

A fourth obtaining module, configured to obtain a fourth signal value of the second signal after a third time;

Correspondingly, the determining module 64 is configured to determine whether to switch the OLP from the first transmission link to the second transmission link according to the first judgment result, the second judgment result, and the third judgment result.

In one solution, the determining module 64 is further configured to:

The first judgment result characterizes that the first signal value and the second signal value are both smaller than the respective first threshold values, and the second judgment result characterizes that the third signal value is greater than or equal to the second threshold value and the first threshold value. Three judgment results indicate that the fourth signal value is less than a third threshold, controlling the OLP to maintain the first transmission link.

In one solution, the determining module 64 is further configured to:

The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first thresholds, and the second judgment result indicates that the third signal value is smaller than the second threshold and the third When the judgment result indicates that the fourth signal value is greater than or equal to a third threshold, the OLP is controlled to switch from the first transmission link to the second transmission link.

In the embodiment of the present invention, the first obtaining unit 32, the second obtaining unit 33, the third obtaining unit 34, and the determining unit 35 in the device for switching the OLP transmission link can be used in practical applications. Central processing unit (CPU, Central Processing Unit), digital signal processor (DSP, Digital Signal Processor), microcontroller unit (MCU, Microcontroller Unit) or programmable gate array (FPGA, Field-Programmable Gate Array) are implemented.

It should be noted that the switching device of the OLP transmission link in the embodiment of the present application, because the principle of the switching device of the OLP transmission link to solve the problem is similar to the aforementioned switching method of the OLP transmission link, therefore, the switching method of the OLP transmission link For the implementation process and implementation principle of the switching device, please refer to the foregoing description of the implementation process and implementation principle of the switching method of the OLP transmission link, and the repetition will not be repeated.

The embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, it is used to perform at least the steps of any one of the methods shown in FIGS. 2 to 6. The computer-readable storage medium may specifically be a memory.

The embodiment of the present invention also provides an OLP. FIG. 7 is a schematic diagram of the hardware structure of an OLP according to an embodiment of the present invention. As shown in FIG. 7, the OLP includes: a communication component 73 for data transmission, at least one processor 71, and storage capable of running on the processor 71 The memory 72 of the computer program. The various components in the terminal are coupled together through the bus system 74. It can be understood that the bus system 74 is used to implement connection and communication between these components. In addition to the data bus, the bus system 74 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clear description, various buses are marked as the bus system 74 in FIG. 7.

Wherein, the processor 71 executes at least the steps of any one of the methods shown in FIG. 2 to FIG. 6 when executing the computer program.

It is understood that the memory 72 may be a volatile memory or a non-volatile memory, and may also include both volatile and non-volatile memory. Among them, the non-volatile memory can be a read-only memory (ROM, Read Only Memory), a programmable read-only memory (PROM, Programmable Read-Only Memory), an erasable programmable read-only memory (EPROM, Erasable Programmable Read- Only Memory, Electrically Erasable Programmable Read-Only Memory (EEPROM), Ferromagnetic Random Access Memory (FRAM), Flash Memory, Magnetic Surface Memory , CD-ROM, or CD-ROM (Compact Disc Read-Only Memory); magnetic surface memory can be magnetic disk storage or tape storage. The volatile memory may be a random access memory (RAM, Random Access Memory), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (SRAM, Static Random Access Memory), synchronous static random access memory (SSRAM, Synchronous Static Random Access Memory), and dynamic random access memory. Memory (DRAM, Dynamic Random Access Memory), Synchronous Dynamic Random Access Memory (SDRAM, Synchronous Dynamic Random Access Memory), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM, Double Data Rate Synchronous Dynamic Random Access Memory), enhanced Type synchronous dynamic random access memory (ESDRAM, Enhanced Synchronous Dynamic Random Access Memory), synchronous connection dynamic random access memory (SLDRAM, SyncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, Direct Rambus Random Access Memory) ). The memory 72 described in the embodiment of the present invention is intended to include, but is not limited to, these and any other suitable types of memory.

The method disclosed in the foregoing embodiment of the present invention may be applied to the processor 71 or implemented by the processor 71. The processor 71 may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 71 or instructions in the form of software. The aforementioned processor 71 may be a general-purpose processor, a DSP, or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like. The processor 71 may implement or execute various methods, steps, and logical block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, and the storage medium is located in the memory 72. The processor 71 reads the information in the memory 72 and completes the steps of the foregoing method in combination with its hardware.

In an exemplary embodiment, the switching device of the OLP transmission link can be implemented by one or more application specific integrated circuits (ASIC, Application Specific Integrated Circuit), DSP, Programmable Logic Device (PLD, Programmable Logic Device), and complex programmable logic device. Logic device (CPLD, Complex Programmable Logic Device), FPGA, general-purpose processor, controller, MCU, microprocessor (Microprocessor), or other electronic components are implemented to implement the foregoing OLP transmission link switching method.

In the embodiments provided in this application, it should be understood that the disclosed device and method may be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, such as: multiple units or components can be combined, or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the coupling, or direct coupling, or communication connection between the components shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms. of.

The units described above as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units; Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, the functional units in the embodiments of the present invention can be all integrated into one processing unit, or each unit can be individually used as a unit, or two or more units can be integrated into one unit; the above-mentioned integration The unit can be implemented in the form of hardware, or in the form of hardware plus software functional units.

A person of ordinary skill in the art can understand that all or part of the steps in the above method embodiments can be implemented by a program instructing relevant hardware. The foregoing program can be stored in a computer readable storage medium. When the program is executed, it is executed. Including the steps of the foregoing method embodiment; and the foregoing storage medium includes: removable storage devices, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks, etc. A medium that can store program codes.

Alternatively, if the aforementioned integrated unit in the embodiment of the present invention is implemented in the form of a software function module and sold or used as an independent product, it may also be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present invention can be embodied in the form of a software product in essence or a part that contributes to related technologies. The computer software product is stored in a storage medium and includes a number of instructions to enable A computer device (which may be a personal computer, a server, or a network device, etc.) executes all or part of the methods described in the various embodiments of the present invention. The aforementioned storage media include: removable storage devices, ROM, RAM, magnetic disks, or optical disks and other media that can store program codes.

The methods disclosed in the several method embodiments provided in this application can be combined arbitrarily without conflict to obtain new method embodiments.

The features disclosed in the several product embodiments provided in this application can be combined arbitrarily without conflict to obtain new product embodiments.

The features disclosed in the several method or device embodiments provided in this application can be combined arbitrarily without conflict to obtain a new method embodiment or device embodiment.

The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. It should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Industrial applicability

In the embodiment of the present invention, by obtaining the first time information, the signal values of the first signal and the second signal are obtained from the first time to the second time, and after the third time, at least the value of the first signal is obtained Acquire again, and determine whether to perform the OLP transmission link through the signal values of the first signal and the second signal acquired from the first time to the second time and the signal values of the first signal acquired after the third time Switch. This scheme of whether to switch the transmission link based on the signal value obtained within the specified time can at least avoid the invalid switching of the OLP at the current level caused by the switch of the previous level OLP, and solves the problem of the previous level in the related technology. Level OLP switching, a technical problem that causes meaningless switching of cascaded OLP.

Claims (10)

1. An OLP transmission link switching method includes: for at least one OLP of at least two OLPs connected in a cascade manner, the at least one OLP includes a first input terminal for receiving a first signal and a first input terminal for receiving a first signal. The second input terminal of the second signal;

   Obtaining first time information in which signal values of the first signal and the second signal are both smaller than the respective first threshold;

   In the first time to the second time, the first signal value of the first signal and the second signal value of the second signal are obtained; wherein the second time is determined by the second input terminal The time when the received signal value of the second signal reaches the first threshold set for the second signal;

   After the third time, at least the third signal value of the first signal is obtained, where the third time is the value of the first signal from the first signal set for the first signal after the second time. Time information when the threshold reaches the second threshold;

   According to the first signal value, the second signal value, and the third signal value, it is determined whether to switch the OLP from the first transmission link to the second transmission link.
2. The method according to claim 1, wherein the determining whether to switch the OLP from the first transmission link to the second transmission link based on the first signal value and the second signal value, and the third signal value Transmission link, including:

   Judging the magnitude relationship between the first signal value and the second signal value and the respective first thresholds to obtain a first judgment result; and

   Judging the magnitude relationship between the third signal value and the second threshold to obtain a second judgment result;

   According to the first judgment result and the second judgment result, it is determined whether to switch the OLP from the first transmission link to the second transmission link.
3. The method according to claim 2, wherein the determining whether to switch the OLP from the first transmission link to the second transmission link according to the first judgment result and the second judgment result comprises:

   The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first threshold value, and the second judgment result indicates that the third signal value is greater than or equal to the second threshold value Next, controlling the OLP to maintain the first transmission link.
4. The method according to claim 2, wherein the determining whether to switch the OLP from the first transmission link to the second transmission link according to the first judgment result and the second judgment result comprises:

   In the case where the first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first threshold value, and the second judgment result indicates that the third signal value is smaller than the second threshold value , Controlling the OLP to switch from the first transmission link to the second transmission link.
5. The method according to any one of claims 2 to 4, wherein the method further comprises:

   After the third time, obtain the fourth signal value of the second signal;

   Judging the magnitude relationship between the fourth signal value and the third threshold, and obtaining a third judgment result;

   Correspondingly, the determining whether to switch the OLP from the first transmission link to the second transmission link according to the first judgment result and the second judgment result includes:

   According to the first judgment result, the second judgment result, and the third judgment result, it is determined whether to switch the OLP from the first transmission link to the second transmission link.
6. The method according to claim 5, wherein the determining whether to switch the OLP from the first transmission link to the second transmission link according to the first judgment result, the second judgment result, and the third judgment result, comprises :

   The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first thresholds, and the second judgment result indicates that the third signal value is smaller than the second threshold and the third When the judgment result indicates that the fourth signal value is less than a third threshold, control the OLP to maintain the first transmission link.
7. The method according to claim 5, wherein the determining whether to switch the OLP from the first transmission link to the second transmission link according to the first judgment result, the second judgment result, and the third judgment result, comprises :

   The first judgment result indicates that the first signal value and the second signal value are both smaller than the respective first thresholds, and the second judgment result indicates that the third signal value is smaller than the second threshold and the third When the judgment result indicates that the fourth signal value is greater than or equal to a third threshold, the OLP is controlled to switch from the first transmission link to the second transmission link.
8. An OLP transmission link switching device, wherein the device includes: a first acquisition module, a second acquisition module, a third acquisition module, and a determination module; the OLP includes a first input terminal configured to receive a first signal And a second input terminal configured to receive a second signal; wherein,

   The first acquiring module is configured to acquire first time information whose signal values of the first signal and the second signal are both smaller than the respective first threshold;

   The second acquisition module is configured to acquire the first signal value of the first signal and the second signal value of the second signal during the first time to the second time; wherein the second time Is the time when the signal value of the second signal received by the second input terminal reaches the first threshold set for the second signal;

   The third acquisition module is configured to acquire at least a third signal value of the first signal after a third time, where the third time is the value of the first signal after the second time Time information when the first threshold set for the first signal reaches the second threshold;

   The determining module is configured to determine whether to switch the OLP from the first transmission link to the second transmission link according to the first signal value, the second signal value, and the third signal value.
9. A computer-readable storage medium having a computer program stored thereon, wherein the program is executed by a processor to implement the steps of the method described in any one of claims 1 to 7.
10. An OLP includes a memory, a processor, and a computer program stored on the memory and capable of running on the processor, wherein the processor implements the steps of the method described in any one of claims 1 to 7 when the processor executes the program.

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