KR100279926B1 - Line status inspection and recovery method in switched system - Google Patents

Abstract

The present invention relates to a method for checking and restoring a state of a circuit in a switching system. In particular, the present invention provides a method for quickly and accurately recovering a transmission error of state change data that may occur when checking a state change of a plurality of circuits connected to a switching system. A circuit state inspection and recovery method in a switching system.

Conventionally, due to the loss of state change data transmitted from the matching device to the matching device processor, the detection of error signals and the occurrence of delay reports, call processing errors of the circuits occur and the normal state cannot be restored for a long time. There was a problem that can not perform a smooth call processing operation.

The present invention prevents error data detection by setting a valid bit in the state change data, inspects the state change data of the current line stored in the matching device, and quickly recovers an error due to loss of state change data and a delay report. Therefore, there is an advantage that can perform a smooth call processing operation.

Description

Line status inspection and recovery method in switched system

The present invention relates to a method for checking and restoring a state of a circuit in a switching system. In particular, the present invention provides a method for quickly and accurately recovering a transmission error of state change data that may occur when checking a state change of a plurality of circuits connected to a switching system. A circuit state inspection and recovery method in a switching system.

In general, in a switching system having a small number of analog subscribers and a digital relay line, the state signal of the line is monitored, and the matching device processor stores the state signal of the multiple lines in the memory area of the matching device. After checking the status signal from time to time, it uses the detail scanning method that compares the previous status signal of the line with the current state and performs call processing operation corresponding to the change of the status signal of the corresponding line. In a switching system having a change in a representative bit indicating a state of a plurality of lines, a representative that performs a call processing operation corresponding to a change in a state signal by sequentially searching for a plurality of lines using the corresponding representative bit. Scanning (Summary Scanning) method was used.

Referring to FIG. 1, the circuit state inspection operation in the conventional switching system will be described with a representative scanning method as follows.

First, in the representative state scanning method of the line state inspection method, a representative bit representing a signal state of a plurality of lines of a switching system is set and stored in the memory area of the matching device. The signal state of a number of lines using the representative bit is checked by the detail scanning method.

First, the matching processor checks the representative bit stored in the memory area of the matching device (step S11), determines whether a change has occurred in the corresponding representative bit (step S12), and operates if there is no change in the corresponding representative bit. To exit. On the other hand, when a change occurs in the corresponding representative bit, that is, when there is a line in which a state signal change occurs among a plurality of lines using the representative bit, the matching device processor sequentially searches for a plurality of lines using the changed representative bit. Detects the status signal (step S13), detects the existing status signal stored in the matching device (step S14), compares the existing status signal with the status signal obtained by the matching device processor, and generates a change. It is judged whether or not (step S15).

At this time, if there is no change by comparing the state signal of the retrieved line with the existing state signal stored in the matching device, the matching device processor determines whether the state signal check for all the lines using the representative bit in which the change has been completed is completed. (Step S16). At this time, if there is a line in which the state signal check is not completed among the multiple lines using the representative bit, the process returns to step S13 to repeat the operation, so that the state signal and the matching device of the line which has not completed the state signal check are performed. It compares the existing state signals stored and checks whether the state signal of the corresponding line changes.

On the other hand, when the change occurs by comparing the state signal of the line retrieved in step S15 with the existing state signal stored in the matching device, the main processor requests a call processing operation corresponding to the changed state signal of the corresponding line. After performing the call processing operation corresponding to the changed state signal (step S17), the operation of step S16 is performed to search whether there is a line which does not complete the state signal check among the plurality of lines using the representative bit. .

On the other hand, in the conventional switching system using such a representative scanning method, the line state inspection method requires that the matching device processor periodically checks the matching device to monitor the change in the state signal of the line. There is a problem that the efficiency of the matching device processor and the efficiency of the system are lowered.

Accordingly, as a method for solving the problems occurring in the circuit state checking method in a conventional switching system using a representative scanning method, a circuit state change checking method in a switching system using a transition scanning method has been proposed. In the circuit state checking method using the conversion scanning method, the matching device determines the state of the multiple lines, and transmits the state change data of the corresponding line to the matching device processor, and the matching device processor transmits the multiple lines transmitted from the matching device. After saving the state change data in the internal local memory, the main processor is required to perform a call processing operation corresponding to the state change on the line which has been changed by comparing with the state change data received from the matching device. State processor changes status on multiple lines There is no need to search the matching device to determine the system performance, which can improve the device processor performance and system efficiency.

However, conventionally, due to the loss of state change data transmitted from the matching device to the matching device processor, the detection of error signals, and the occurrence of delay reports, call processing errors of the line occur and the normal state cannot be restored for a long time. By doing so, there was a problem that the smooth call processing operation could not be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its purpose is to set a valid bit in the state change data to prevent error data detection, and to check the state change data of the current line stored in the matching device. By quickly recovering from errors due to data loss and delay reporting, smooth call processing can be performed.

1 is a flowchart illustrating a circuit state checking method in a general switching system.

2 is a block diagram showing a circuit state inspection and recovery apparatus in an exchange system according to an embodiment of the present invention;

3 is a diagram showing the configuration of state change data according to the present invention;

4 is a flowchart illustrating an operation for implementing a circuit state change checking method in a switching system according to the present invention;

FIG. 5 is an operational flowchart for implementing a method of setting counts and indexes in FIG. 4.

FIG. 6 shows count and index setting in the storage means when the write pointer is larger than the read pointer in FIG.

FIG. 7 shows count and index setting in the storage means when the read pointer is larger than the write pointer in FIG.

Explanation of symbols on the main parts of the drawings

10: matching device 20: matching device processor

30: main processor 40: storage means

In order to achieve the above object, there is provided a circuit state checking and repairing method in a switching system, comprising: setting and storing a count and an index for a memory area to be retrieved by receiving state change data; If the count is not '0' and there is no error in the line signal of the state change data, comparing the line signal with a pre-stored line signal and checking whether the corresponding line signal has changed; If the line signal is changed, checking the regular bit of the state change data to determine whether there is a change in the signal state of the line; If there is a change in the signal state of the line, performing a call processing operation corresponding to the changed line signal, storing the state change data, and then decreasing the count by '1'.

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

The circuit state inspection and recovery apparatus in the switching system according to the embodiment of the present invention includes a matching device 10, a matching device processor 20, a main processor 30, as shown in FIG. It comprises a storage means 40.

The matching device 10 monitors the state of a plurality of lines, stores the state change data of the corresponding line, and applies the matching device to the matching device processor 20. The matching device processor 20 compares the line signal of the state change data received from the matching device 10 with the line signal of the state change data stored in the memory area of the storage means 30 to generate a change in the corresponding line signal. In this case, the main processor 30 requests a call processing operation corresponding to the line signal change.

The main processor 30 performs a call processing operation corresponding to the line signal change in response to a call processing request from the matching device processor 20. The storage means 30 stores the state change data applied from the matching device 10 side in the internal memory area.

At this time, the configuration of the state change data applied from the matching device 10 and stored in the storage means 40 is a valid bit (V15) of 1 bit (B15) for determining whether or not an error of the state change data as shown in FIG. Bit) and 4 bits (B11 to B14) of line signal (Line Signaling Data) indicating each signal type according to the line state, and whether the corresponding state change data is data indicating the change of the signal state of the line or the signal state of the line. It consists of a regular flag of one bit (B10) for distinguishing whether or not it is data indicating a data, and a line number of 10 bits (B0 to B9) set to distinguish a plurality of lines.

Referring to Figures 4 and 5 attached to the circuit state check and recovery operation in the switching system according to an embodiment of the present invention configured as described above are as follows.

The matching device 10 periodically detects and stores the state signals of a plurality of lines connected to the switching system and then applies the matching device 20 to the matching device processor 20 (step S31). The matching device processor 20 matches the matching device 10. The first index (CN_0) and the second count (Cnt_1) for counting the number of memory regions to be searched as the state change data is received from the first index (Index_0) and the second index (C) indicating the memory regions to be initially searched. Index_1) is set and stored (step S32).

At this time, the setting of the count and the index is performed by the matching device processor 20 by comparing the write pointer with the read pointer for the storage means and checking whether they are the same as shown in FIG. 5 (step S51). In the same case, that is, when the state change data is not transmitted from the matching device 10, the first count and the second count are set to '0' and stored (step S52).

However, if the write pointer and the read pointer are not the same, it is checked whether the write pointer has a larger value than the read pointer (step S53). For example, as shown in FIG. 6, the write pointer is read to the read pointer. In the case of having a large value, the first count is set to the subtracted value of the write pointer and the read pointer, the second count is set to '0', and the first index is the memory area Mem2 at the position corresponding to the read pointer. Set and save (step S54).

On the other hand, in step S53, if the read pointer has a larger value than the write pointer as shown in FIG. 7, the first count is set to the subtracted values of the entire memory areas Mem0 to MemN and the read pointer, The second count is set as the write pointer, the first index Index_0 is set as the memory area Mem4 at the position corresponding to the read pointer, and the second index Index_1 is set as the initial memory area Mem0 and stored. (Step S55).

Subsequently, in the accompanying FIG. 4, the matching device processor 30 determines whether the first count value is '0' (step S33), and when the first count value is not '0', the matching device 10. The state change data received from the controller is checked (step S34), and it is checked whether or not the valid bit of the state change data is set to '0', that is, there is no error in the line signal of the state change data (step S35).

At this time, if the valid bit of the state change data received from the matching device 10 is set to '0', that is, if there is no error in the line signal of the corresponding state change data, the matching device processor 20 is the matching device. The line signal of the state change data received from (10) and the line signal of the existing state change data stored in the memory area of the storage means 40 are detected (step S36). Then, the line signal from the matching device 10 and the existing line signal of the storage means 40 are compared to check whether the existing line signal is changed (step S38), and the existing line signal is received from the matching device 10. In the case where the signal is changed to the line signal of, it is checked whether the regular bit of the state change data applied from the matching device 10 is set to '0' (step S38). At this time, if the corresponding regular bit is set to '0', that is, if the state change data is data indicating a change in the signal state of the corresponding line, a call corresponding to the line signal of the state change data received from the matching device 10 is received. After requesting the processing operation to the main processor 30 to cause the corresponding main processor 30 to perform a call processing operation corresponding to the changed line signal (step S39), the memory area of the storage means 40 stores the state change data. Is stored (step S40), the count is decreased by '1' (step S44), and the inspection operation for the next state change data is performed.

On the other hand, when an error occurs in the state change data in step S35 and the corresponding valid bit is set to '1', or the state change data is lost in the transmission process in step S38 and the corresponding regular bit is set to '1'. It is determined that an error has occurred in the transmission process of the state change data (step S41), and the state change data of the current line stored in the matching device 10 is retrieved (step S42), and the state change data of the current line is stored. After causing the main processor to perform the corresponding call processing operation (step S43), the count is decreased by '1' (step S44), and the control unit returns to step S33 to perform a repetitive operation to perform a check operation on the next state change data. do.

On the other hand, when the first count value is '0' in step S33, that is, when the processing operation on the state change data is performed for the number of times corresponding to the first count value, the matching device processor 30 performs the second count. It is checked whether the value is '0' (step S45).

In this case, when the corresponding second count value is not '0', that is, when there is state change data to be processed the number of times corresponding to the second count value, the state change data received from the matching device 10 is inspected. Return to step S34 to perform a repeating operation, but repeatedly until the second count value is '0', that is, until all processing on the state change data received from the matching device 10 is completed do.

As described above, the present invention prevents error data detection by setting a valid bit in the state change data, and checks the state change data of the current line stored in the matching device to prevent the loss and delay of the state change data. By recovering quickly, there is an advantage that can perform a smooth call processing operation.

Claims (4)

In the circuit state inspection and recovery method in a switching system, Setting and storing a count and an index of a memory area to be retrieved by receiving the state change data; If the count is not '0' and there is no error in the line signal of the state change data, comparing the line signal with a pre-stored line signal and checking whether the corresponding line signal has changed; If the line signal is changed, checking the regular bit of the state change data to determine whether there is a change in the signal state of the line; If there is a change in the signal state of the line, performing a call processing operation corresponding to the changed line signal, storing the state change data, and then reducing the count by '1'. How to check and recover line state in your system. The method of claim 1, The setting and storing of the count and the index may include: storing and setting the count to '0' if the write pointer and the read pointer for the storage means are the same; If the write pointer for the storage means is larger than the read pointer, the first count is set to the subtracted value of the write pointer and the read pointer, the second count is set to '0', and the first index is indicated by the read pointer. Setting and storing the memory area in the memory area; When the write pointer for the storage means is smaller than the read pointer, the first count is set to the subtracted value of the entire memory area and the read pointer, the second count is set to the write pointer, and the first index is indicated by the read pointer. And setting and storing the second index as the first memory area and storing the first memory area. The method of claim 1, If there is an error in the line signal of the state change data or if the state change data is lost in the transmission process as a result of checking the regular bit, after retrieving the state change data of the pre-stored line and performing a corresponding call processing operation And reducing the count by '1'. The method of claim 1, And comparing the line signal with a pre-stored line signal and reducing the count by '1' when the corresponding line signal has not changed.