KR20030046603A - the method for 1+1 line protecting switching in transmission system and recorded media - Google Patents

Abstract

In the 1 + 1 line protection switching method of the optical transmission system according to the present invention, in the 1 + 1 line protection switching method of the optical transmission system, the data indicating the state of the line of the operating section and the line of the reserve section, and for protection switching Receiving the transfer command data of the operator, and in accordance with the received line status data and the operator command data, determine whether the line protection switching is possible and the transfer priority based on the previously stored protection transfer determination table Generating a control signal for the control unit; and controlling a hardware for replacing the abnormal line with the normal line according to the control signal to perform a predetermined transfer.

According to the present invention, a table for judging whether a line can be switched and determining priority can be prepared, and when a requirement for switching is generated, it is performed by relying on a written table to perform a simple and quick transfer. Provide effect.

Description

The method for 1 + 1 line protecting switching in transmission system and recorded media

The present invention relates to a 1 + 1 line protection switching method of a transmission system and a recording medium therefor.

In general, in the optical transmission system including the SDH / SONET-based optical transmission device, even if a system failure occurs, the operation channel currently operated to stably operate the system, and the operation channel in which the failure occurs when a failure occurs in the operation channel. It operates a reserve channel that enables the transfer and normal operation. As a result, switching between operational and reserve channels has become an important variable for stability in the system.

In the conventional 1 + 1 linear protection switching device, let's look at the input data related to the switching and the output data for switching by the input data.

The input data may first include a signal indicating a reception line state of a local system. The reception line state signal may include a signal fail state, a signal degraded state, and a no defect signal.

Next, an operator's transfer command signal for the protection switching group may be input. For example, there may be a lockout command, a forced switch and a manual switch.

In the case of bidirectional switching, the received K1 / K2 bytes can be used as input data with the protection switching condition of the power system.

On the other hand, the output data for performing the transfer by the above input data may include a channel determination signal (0 or 1) for determining the operating channel of the own station, and may include K1 and K2 byte information that should be transmitted from the own station to the large station. In addition, there may be a signal specifying the protection switching type corresponding to the input data.

1 shows an example of the conventional 1 + 1 line protection switching device described above. Referring to FIG. 1, the working channel 1, the working line 2, and the protecting line 3 of the operating section are permenant bridges at the transmitting side, and at the receiving side. It is a method of selecting a good track among the working line (2) and the protective switching line (3) of the operating section.

In this scheme, if the channel number of the working line is 0 and the channel number of the protection line is 1, the signal input through the transmitting side 1 is a selector. The switch may be connected to channel 1 or switched to channel 0 according to the switching signal by (4).

In this 1 + 1 line protection switching circuit, the switching priority is as shown in Table 1.

2 is a flowchart illustrating a procedure of performing protection switching in a conventional 1 + 1 line protection switching circuit. Referring to FIG. 2, after the occurrence or change of the above-mentioned input data is detected by an interrupt or polling method (S1) to perform protection switching in a 1 + 1 line protection switching circuit (S1), whether protection switching is possible and appropriate output. In order to generate data, whether or not protection switching is possible and a switching priority is determined (S2), and output data is generated (S3). Thereafter, hardware control is performed based on the output data to complete the protection switching (S4).

On the other hand, the line protection switching of the optical transmission equipment must be completed within a short time within 50 ms in consideration of the large capacity of the data to be processed, and the shortening of the switching time can be treated as an advantage of the equipment in data survivability.

However, in the case of performing the conventional 1 + 1 line protection switching method, the criteria for determining whether or not to be changed and priority is not changed while the equipment is in operation. Repeating the corresponding process is a wasteful factor in considering the transfer completion time, and thus, it is difficult to implement and debug the corresponding algorithm.

The present invention has been made to solve such a conventional problem, in determining whether or not the transfer priority of the 1 + 1 line protection transfer and the transfer priority, by using a pre-made table to reduce the transfer completion time, the transfer decision criteria The purpose of the present invention is to provide a method of switching 1 + 1 line protection switching which can improve the acceleration of the switch and easily adapt to the change of the transfer criteria later.

1 is an exemplary view of a conventional 1 + 1 line protection switching device.

FIG. 2 is a flow chart of a schematic procedure for performing protective switching in the 1 + 1 line protective switching device of FIG.

3 is an overall control flow diagram for performing a 1 + 1 line transfer in accordance with the present invention.

4 is a conceptual diagram illustrating a procedure of applying a protection switching table according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: Operation channel 2: Operation section

3: protection transfer section 4: transfer selector

10: Operation section automatic switching condition table

20: preliminary section transfer condition table

30: Self-transfer determination table 40: MS transfer determination table

50: Operation Channel / Transmission K2 Decision Table

According to one aspect of the 1 + 1 line protection switching method of the optical transmission system according to the present invention that achieves this object, in the 1 + 1 line protection switching method of the optical transmission system, Receiving the data indicating the status, the operator's transfer command data for the protection switching, and the transfer of the line protection switching based on the previously stored protection transfer determination table corresponding to the received line state data and the operator's command data. Determining a possibility and a switching priority, generating a control signal for switching, and controlling a hardware for replacing an abnormal line and replacing the abnormal line according to the control signal to perform a predetermined switching. .

In addition, the recording medium for performing the 1 + 1 line protection switching method of the optical transmission system according to the present invention, in order to perform the 1 + 1 line protection switching method of the optical transmission system, a program of instructions that can be executed by the digital processing apparatus A recording medium tangibly embodied and readable by a digital processing apparatus, the recording medium comprising: receiving data indicating the state of the line of the own operation section and the line of the reserve section, and transfer command data of the operator for protection switching; Generating control signals for switching by judging whether line protection switching is possible and switching priority based on a previously stored protection switching determination table according to the received line state data and the operator's command data. And to replace the abnormal line with the normal line according to the control signal. And a step of performing a predetermined transfer by controlling the hardware.

Here, the protection switching judgment table, the operation section switching judgment table for generating the switching condition information of the operating section by comparing the line status and the priority of the operator command for the line of the operating section, and the line for the line of the spare section Transfer of own station to generate local transfer condition information according to the transfer section decision table for generating the transfer condition information of the preliminary section by comparing the status and priority of the operator command, and the transfer condition information in the operating / spare section transfer decision table A decision table, a bidirectional transfer decision table for generating high priority transfer condition information according to the first transfer condition information of the player and the transfer condition information of the host, in the bidirectional transfer mode, a first transfer condition information of the player, and The operating channel is determined and the transfer control is performed according to the output transfer condition information and the second transfer information of the power station. It may include a table for generating the arc.

As described above, in the present invention, a table for determining whether to switch existing and priority is determined, and when a requirement for switching is generated, the switchover is simply and quickly performed depending on the written table.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is an overall control flowchart for performing a 1 + 1 line transfer according to the present invention. Referring to FIG. 3, first, it is determined whether a protection switching requirement has occurred. (S11) When a protection switching requirement has occurred, the protection switching requirement occurrence signal is received (S12) based on a written protection switching determination table. A control signal for switching is output (S13). Then, the hardware is controlled according to the control signal to perform the set switching (S14).

As described above, according to the present invention, it is necessary to generate the tables for each stage as the transferability determination and the priority determination are performed based on the prepared table. 4 is a conceptual diagram illustrating a procedure of applying a protection switching determination table according to the present invention. Let's look at each step table for the protection switching with reference to FIG.

For the protection switching according to the present invention, the table 10 defining the operating section switching condition, the table 20 for determining the switching condition of the spare section, the table 30 for determining the switching condition of the own country, and the MS A table 40 for determining a switching condition and a table 50 for determining an operation channel and determining a transmission K2 byte are required.

In each of these determination tables, the protection switching requirements that can act as input data may include a reception line state (operation / preliminary) of the host, an operator's transfer command to the protection switching group, and a reception K1 / K2 byte.

In addition, the final output data includes a transmission K1 byte value and an operation channel / transmission K2 byte which are directly used for hardware control as a result of the MS switching determination table 40 and the operation channel / transmission K2 determination table 50.

In the operating section automatic switching condition table 10, the operation section automatic switching condition signal indicating the line status in two operating section lines consisting of 1 + 1 and the operating section operator command input from the operator are input data. By comparing the line status with the priority of the operator's command, the priority for the transfer of the operating section is determined and output based on the result data with high priority. This output data means the switching condition information of the operating section.

In the preliminary section transfer condition table 20, the preliminary section automatic transfer condition occurrence signal indicating the track state in two preliminary section lines constituted by 1 + 1 and the preliminary section operator command input from the operator are input data. By comparing the line status with the priority of the operator's command, the priority for the transfer of the operating section is determined and output based on the result data with high priority. This output data means the transfer condition information of the preliminary section.

In the own transfer switching determination table 30, the output data and the output data of the preliminary section transfer condition table 20 are received as input data from the operating section transfer condition table 10, and the transfer conditions of each line section are compared to be protected in the host. And output data to determine the interval to protect. When unidirectional protection switching is applied, it is not necessary to consider the switching conditions at the power station, so the result obtained in this table becomes the final transmission K1 value.

In the MS switching determination table 40, the output data of the own station switching determination table 30 and the received K1 byte signal representing the transfer information of the power station are used as input data to determine whether the MS is switched or not, and outputs the transmission K1 byte value. That is, the transfer condition of the high power determined by comparing the transfer condition of the own station determined in the own transfer switching determination table 30 with the received K1 byte value is determined. This process is used only in the bidirectional transfer mode in which the transfer information of the game is meaningful.

In the operation channel determination / transmission K2 byte determination table 50, the operation channel is determined using the transmission K1 byte value, the reception K1 byte value, and the reception K2 byte value output from the MS switching determination table 40 as input data, and transmission K2 is determined. The byte is judged and the operation channel / transmission K2 byte data is output.

Operation Channel Determination / Transmission The role of the K2 byte determination table 50 is to determine the control value of the own station in the process of performing the switching according to the matter determined through the tables 10-40 as described above. Here, the control value of the host means the operation channel and the transmission K2 value. In the bidirectional transfer mode, even after the transfer is decided, the process of acquiring the permission of the power for the transfer is performed at a time difference. Therefore, after several input data changes and output data determination processes, the control is finally obtained to obtain a value that controls the hardware. You can finish it.

As such, each table contains information on the criteria and priority of the transfer decision, and the final output data desired can be obtained through direct access of the table without any algorithm during equipment operation. Transfer criteria and priorities used here are designed in accordance with IUT-T Recommendation G.783 Annex A's 1: N Compatible 1 + 1 Protection Switching Architecture.

Tables 2, 3, and 4 are examples of a table for acquiring the final output data, respectively, and the input data is obtained in the order of Table 2-> Table 3-> Table 4-> Table 5.

Let's explain each table with reference to each table.

Table 2 shows an example of the operating section transfer condition table 10 and the preliminary section transfer condition table 20. As can be seen from the table, the row means command information requested by the operator for one line. The column means the track status information of the corresponding track. The output data of Table 2 is used as the input data of Table 3, which is the local transfer decision table 30.

In more detail, the columns representing the input data of the status information of the tracks are locked out, forced switch, manual switch, manual switch waiting time (WTR), and APS test. (Exercise), No User Comand.

On the other hand, the row representing the input data of the operator's command information for the line is composed of a signal failure (P), a signal failure (W), a signal degrade (Signal Degrade), no auto condition (No Auto Condition).

According to the input data, the types of output data include lockout, forced transfer, signal failure, signal degradation, manual transfer, manual transfer wait time, and the like. WTR), APS test (Exercise), and NONE.

In the case of reference to a row indicating the operator's command information, in the case of a signal failure P, the signal failure SF is output even if any input data is input to a variable in the column.

On the other hand, when the input data of the operator command information is a signal failure (W), the lockout state value is output when the thermal information is in the lockout state, and when the forced switch value is the forced switch value. A forced switch state is output, and in the other case, a signal failure (SF) is output.

On the other hand, when the input data of the operator command information is signal degrade, when the thermal information is in the lockout state, the lockout state value is output and the forced switch is made. If it is a value, it outputs a forced switch, and in the other case, it outputs a signal degrade.

On the other hand, when the input data of the operator command information is No Auto Condition, the input data of the line status information is used as the output data as it is.

Table 3 shows an example of the self-switching decision table 30. As can be seen from the table, the row is output data of Table 2, the transfer condition information of the operating section, and the column is output data of Table 2. It means transfer condition information of preliminary section.

That is, the type of input data includes lockout, forced switchover (Forced), signal failure (SF), signal degradation (SD), manual switchover (Manual), transferback wait time (WTR), APS test (Exercise), NONE.

On the other hand, the type of output data according to this is composed of 0xF0, 0xE0 0xE1, 0xD0, 0xD1, 0xB0 0xB0, 0x80 0x81, 0x60, 0x41, 0x20 0x21, 0x00 0x11, Invalid, and indicates the switching information of the host.

The output in Table 3 is used as the input data in Table 4. The main role of Table 3 is to compare the transfer conditions of each track section obtained in Table 2 to determine the section protected and the section protected within the country. When unidirectional protection switching is applied, it is not necessary to consider the switching conditions at the power station, so the result obtained in this table becomes the final transmission K1 value.

Table 4 shows an example of the MS switching determination table 40. The row of Table 4 is the value of the received K1 byte, which means the transfer information of the power, and the column is the output data of Table 3, which indicates the transfer information of the own station. it means.

That is, the variable type of the row, which is input data that means transfer information of the power, is composed of 0xF0, 0xE0 0xE1, 0xD0, 0xD1, 0xB0 0xB0, 0x80 0x81, 0x60, 0x41, and 0x00 0x11.

On the other hand, the variable type of the column, which is the value of the received K1 byte, which means the transfer information of the host, is composed of 0xF0, 0xE0 0xE1, 0xD0, 0xD1, 0xB0 0xB0, 0x80 0x81, 0x60, 0x41, 0x20 0x21, 0x00 0x11, Invalid.

The output in Table 4 is used as the data to control the hardware with the determined transfer type and the value of the transmitted K1 byte and at the same time as the input data in Table 5.

Table 5 shows an example of the operation channel determination / transmission K2 byte determination table 50. As can be seen from the table, the input data are transmission K1 bytes, reception K1 bytes, and reception K2 bytes, which are output data of Table 3, The output data in Table 5 is used as data to control the hardware as operating channel and transmitted K2 bytes.

That is, for example, when the values of the reception K1 & 0x0F, the transmission K1 & 0x0F, and the reception K2 & 0x0F are 0, 0, and 0, respectively, output data in the transmission K2 direction is output 0, and the output of the operation channel is also 0. Outputs Similarly, as shown in the table, the output data is output as 0, 1, and maintenance according to the values of the reception K1 & 0x0F, the transmission K1 & 0x0F, and the reception K2 & 0x0F.

As described above, the present invention reduces the transfer completion time, improves the acceleration of the transfer decision criterion by using a pre-made table in determining whether the 1 + 1 line protection transfer is possible and the transfer priority. It is easy to adapt to the change of criteria and can provide the following effects.

First, since the transfer is performed by directly accessing an existing table without the need to perform a complicated algorithm from the recognition of the transfer occurrence condition to the completion of the transfer through the final hardware control, unnecessary processes during the operation of the equipment are omitted. The effect of reducing the transfer time can be expected.

Second, since the results of all processes related to the protection switching are included in the table, it is easy to track the results of the switching from the protection switching conditions, and it is possible to minimize the influence of other external factors during the execution of the switching process.

Third, the acceleration of the process is good for protection switching, and the table itself facilitates maintenance such as porting / modifying a new system.

Claims (11)

In the 1 + 1 line protection switching method of the transmission system, Receiving data indicative of the state of the line of the own operation section and the line of the reserve section, the transfer command data of the operator for protection switching, Generating a control signal for switching by determining whether line protection switching is possible and switching priority based on a previously stored protection switching determination table according to the received line state data and command data of an operator; And switching the abnormal line according to the control signal, and controlling the hardware for replacing the normal line to perform a predetermined transfer. The method of claim 1, wherein the generating of the control signal for switching is performed by: Priority of line status and operator command for each line using input signal of operation / preliminary section automatic transfer condition occurrence signal indicating track status in operating section track and reserve section and operator / reserve section operator command input from operator Comparing and comparing the result with the higher priority result data to determine the priority for the switching of the operating section to generate the switching condition information of the operating / preliminary section, The transfer condition information of the host to perform the transfer of the host to determine the protected area and the protected area in the host by comparing the transfer condition of each line with the transfer condition information of the operation / preliminary section as input data 1 + 1 line protection switching method of the transmission system performing the step of outputting the control signal for. The method of claim 2, In the bidirectional transfer mode, priority is given by comparing the transfer conditions of the own station generated by receiving the first transfer information of the power station and generating the transfer condition information of the own station and outputting it as a control signal for the transfer. Generating a high transfer condition, Receiving the second transfer information of the power, and using the first transfer information and the output transfer condition output data of the power as input data, determining a management channel and generating a control signal for performing transfer; 1 + 1 line protection switching method of the optical transmission system comprising. The method of claim 1, wherein the protection switching judgment table, An operation section change judgment table for generating transfer condition information of the operation section by comparing the line status and priority of the operator's command with respect to the line of the operation section; A preliminary section transfer determination table for generating transfer condition information of the preliminary section by comparing the line status and the priority of the operator command with respect to the track of the preliminary section; A local transfer decision table for generating local transfer condition information according to the transfer condition information in the operation / preliminary section transfer decision table; In the bidirectional transfer mode, a bidirectional transfer decision table for generating high transfer condition information according to the first transfer condition information of the power station and the transfer condition information of the own station; 1 + 1 line protection switching of an optical transmission system including a table for determining an operation channel and generating a switching control signal according to the first switching condition information of the power and the output switching condition information and the second switching information of the power. Way. The method of claim 4, wherein the operation section switching judgment table, The transfer condition data indicating the track state on the line of the operation section and the operator command inputted from the operator are input data, and the line status and the priority of the operator command for each line are compared to the result data having high priority. A 1 + 1 line protection switching method of an optical transmission system in which a priority for switching between operating sections is determined and the switching condition information of the operating section is used as output data. The method of claim 4, wherein the preliminary section switching judgment table, In the preliminary section, the transfer condition data indicating the track state and the preliminary section operator command data input from the operator are input data, and the line status and the priority of the operator command for each line are compared to the result data having high priority. A 1 + 1 line protection switching method of an optical transmission system in which a priority for switching between operating sections is determined and the transfer condition information of the spare section is used as output data. The method of claim 4, wherein the self-transfer determination table, Transfer condition information of the host for performing the transfer of the host to determine the protected section and the protected section in the station by comparing the transfer condition information of the operation / preliminary section transfer decision table as input data. 1 + 1 line protection switching method of optical transmission system using The method of claim 4, wherein the bidirectional transfer determination table, In the bidirectional transfer mode, the first transfer information of the power station indicating the transfer condition information of the power station and the transfer condition information of the own station are used as input data, and one of the optical transmission systems whose transfer data having the highest priority among the input data is used as output data. +1 line protection switching method. 5. The apparatus of claim 4, wherein the determination table for determining the operation channel and performing the transfer includes input data of the first transfer information of the power and the output transfer condition output data and the second transfer information of the power. A 1 + 1 line protection switching method of an optical transmission system using output signals as control data for determining an operating channel and performing switching. In order to perform the 1 + 1 line protection switching method of the optical transmission system, a program of instructions that can be executed by the digital processing apparatus is tangibly implemented, and in the recording medium that can be read by the digital processing apparatus, Receiving data indicative of the state of the line of the own operation section and the line of the reserve section, the transfer command data of the operator for protection switching, Generating a control signal for switching by determining whether line protection switching is possible and switching priority based on a previously stored protection switching determination table according to the received line state data and command data of an operator; And controlling the hardware for replacing the abnormal line according to the control signal to replace the normal line with the normal line. The method of claim 10, wherein the protection switching judgment table, An operation section change judgment table for generating transfer condition information of the operation section by comparing the line status and priority of the operator's command with respect to the line of the operation section; A preliminary section transfer determination table for generating the transfer condition information of the preliminary section by comparing the line status and the priority of the operator command with respect to the line of the reserve section; A local transfer decision table for generating local transfer condition information according to the transfer condition information in the operation / preliminary section transfer decision table; In the bidirectional transfer mode, a bidirectional transfer decision table for generating high transfer condition information according to the first transfer condition information of the power station and the transfer condition information of the own station; And a table for determining an operation channel and generating a switching control signal according to the first switching condition information of the power and the output switching condition information and the second switching information of the power.