KR100187822B1 - Message loss protecting method in an exchange - Google Patents

Abstract

The present invention relates to a message loss prevention system for a private branch exchange, and more particularly, to a message loss prevention system for preventing a message transmitted from a sub rack to a main rack from being lost when a far- Apparatus and method.

Conventionally, when a message generated in the sub rack is transmitted to the main rack side through the E1 line, the sub rack can transmit the message to the main rack side in the normal state of the E1 line. However, The output message is lost on the E1 line and is not transmitted to the main rack side, so that the system can not be stably operated.

In the case of configuring a remote switching system in a private switchboard, when a sub-rack transmits a message to the main rack via the E1 line, if a failure occurs in the E1 line, the sub-rack stops transmitting the message, When the E1 line is restored normally, the stored message is sent to the main rack side, so that the message is not lost due to the failure of the E1 line, so that the system stably operates.

Description

Apparatus and method for preventing message loss in remote switching at a private branch exchange

FIG. 1 is a diagram for explaining message delivery when a remote switching is performed in a conventional private branch exchange; FIG.

Figure 2 is a block diagram of a remote switching system according to the present invention;

FIG. 3 is a detailed block diagram of the message storage unit shown in FIG. 2; FIG.

FIG. 4 is a flowchart illustrating a message loss prevention process according to the present invention. FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

10: Main rack 11: Network interface part

12: control unit 13:

20: Sub rack 21: Network interface part

22: switching unit 23:

24: control unit 25: message storage unit

The present invention relates to a message loss prevention system for a private branch exchange, and more particularly to a message loss prevention system for preventing a message transmitted from a sub rack to a main rack from being lost when a far- And a method for preventing the same.

Generally, in the case of remote switching in a private branch exchange, it is necessary to transmit the message generated in the sub rack to the main rack side, and the message is transmitted through the E1 line.

Conventionally, a message generated in the sub rack 2 is transmitted to the main rack 1 side via the E1 line as shown in FIG. 1. In the normal state of the E1 line, the sub rack 2 is connected to the main rack 1, A message output from the sub rack 2 is lost on the E1 line and is not transmitted to the main rack 1 in a state in which a failure occurs in the E1 line so that the system can not be stably operated There is a problem.

SUMMARY OF THE INVENTION The present invention is conceived to solve the problems as described above, and it is an object of the present invention to provide a system and method for preventing a message transmitted from a sub rack to a main rack from being lost, And an object of the present invention is to provide a device and a method for preventing loss.

In order to achieve the above object, according to the present invention, there is provided an information processing apparatus comprising: a message storage unit installed in a sub rack for storing and outputting an applied message; If a fault occurs in the E1 line, the E1 line is installed in the sub rack, stores a message applied from the switching unit in the message storage unit, and transmits the message to the E1 line through the information transfer unit and the network interface unit. And outputs a message stored in the message storage unit to the main rack via the E1 line via the network interface with the information transfer unit when the failure of the E1 line is restored .

Meanwhile, the message storage unit includes an SIO for serially transmitting a message to and from the control unit; An SRAM for storing and outputting memory sector information to be applied; A flash memory for storing and outputting an authorized message; A backup battery for supplying power to the SRAM during a power failure to prevent the memory sector information stored in the SRAM from being erased; Storing the memory sector information of the flash memory in the flash memory while accessing the flash memory based on the memory sector information stored in the SRAM to read the message, And outputting it to the control unit side through the control unit.

According to another aspect of the present invention, there is provided a method of operating a switching device, the method comprising: a first step of storing, in a predetermined unit, a message generated when a switching operation is performed in a sub rack; A second step of monitoring the E1 line connected to the main rack side of the sub rack in the first step and confirming whether a fault has occurred in the E1 line; A third step of not transmitting a message stored in the sub rack to the main rack side via the E1 line if a failure occurs in the E1 line in the second step; A fourth step of checking whether or not the E1 line is normally restored in the sub rack after the third step; A fifth step of transmitting the stored message to the main rack side via the E1 line when the E1 line is restored in the fourth step; In the second process, the sub-rack transmits a message stored in the E1 line to the main rack via the E1 line.

When the sub-rack stores the message in the first process, the message is stored and the memory sector information in which the message is stored is stored.

In the fifth and sixth processes, when a message stored in a sub rack is transmitted, the message is read based on the stored memory sector information and is transmitted in predetermined units at predetermined time intervals.

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

2, the main rack 10 includes a network interface unit 11, a control unit 12, and an information transfer unit 13, The sub rack 20 includes a network interface unit 21, a switching unit 22, an information transfer unit 23, a control unit 24, and a message storage unit 25.

The switching unit 22 of the sub rack 20 outputs a message generated when the switching operation is performed to the control unit 24 side. The control unit 24 monitors the E1 line and stores a message applied from the switching unit 22 in the message storage unit 25 when a failure occurs in the E1 line and outputs a message to the information transfer unit 23 And outputs the message stored in the message storage unit 25 to the information transfer unit 23 when the failure of the E1 line is recovered. The information transmitting unit 23 transmits a message from the control unit 24 to the network interface unit 21 and the network interface unit 21 transmits a message from the information transmitting unit 23 through the E1 line And transmits it to the main rack 10 side through the E1 line.

The network interface unit 11 of the main rack 10 receives the message applied through the E1 line and converts the received message into a form that can be processed and outputs the converted message to the information delivery unit 13. The information delivery unit 13 transmits, The controller 12 transmits a message to the controller 12, and the controller 12 processes the message transmitted from the information transmitter 13.

3, the SRAM 26, the CPU 27, the flash memory 28, and the SIO 29 of the message storage unit 25 of the sub rack 20 are connected to the control unit 24 And the CPU 27. The SRAM 26 stores the memory sector information applied from the CPU 27 and outputs the memory sector information to the CPU 27 side. The flash memory 28 stores a message supplied from the CPU 27 and outputs the message to the CPU 27. The backup battery BA supplies power to the SRAM 26 during a power failure, Thereby preventing the memory sector information from being erased. The CPU 27 stores the memory sector information of the flash memory 28 in the SRAM 26 while storing the message applied from the SIO 29 in the flash memory 28, Reads the message in the flash memory 28, and outputs the read message to the control unit 24 through the SIO 29. Also, the flash memory 28 retains the message even if the message is stored, even if the message is interrupted.

In the system of the present invention, when the sub rack 20 transmits a message to the main rack 10 side, it operates in the order shown in FIG. 4 to prevent message loss.

The control unit 24 outputs a message generated when the switching unit 22 of the sub rack 20 performs the switching operation to the control unit 24 side The CPU 27 of the message storage unit 25 stores the message in the message storage unit 25 in a predetermined unit by serially outputting the message in the message storage unit 25 side, The SRAM 26 stores the memory sector information of the flash memory 28 in which the message is stored in the flash memory 28 and the memory sector information of the flash memory 28 in the SRAM 26. [ Thereafter, the control unit 24 monitors the E1 line to check whether or not a fault has occurred in the E1 line (step 33). If a fault occurs in the E1 line, the control unit 24 applies the control signal from the switching unit 22 to the message storage unit 25 (Step 34), and again confirms whether the E1 line is normally restored (step 35). The control unit 24 controls the message storage unit 25 to return the message stored in the message storage unit 25 to the network interface unit via the information transfer unit 23. [ The CPU 27 of the message storage unit 25 accesses the flash memory 28 based on the memory sector information stored in the SRAM 26 and outputs the flash memory 28 to the flash memory 28. [ The control unit 24 outputs the message read from the message storage unit 25 to the information transfer unit 23 via the SIO 29 in predetermined units at predetermined time intervals, To the network interface unit 21 side. Then, the network interface unit 21 converts the message transmitted via the information transfer unit 23 into a format that can be transmitted through the E1 line, and transmits the message to the main rack 10 side through the E1 line (step 37). In step 33, the controller 24 immediately performs the operation of step 36 when no failure occurs in the E1 line, and transmits the message stored in the message storage unit 25 to the network interface (21), thereby causing the network interface unit (21) to transmit the message to the main rack (10) side.

As described above, according to the present invention, when a remote switching system is configured in a private branch exchange, when a sub-rack transmits a message to the main rack through the E1 line, if the E1 line fails, the sub- When the E1 line is restored normally, the stored message is sent to the main rack side, so that the message is not lost due to the failure of the E1 line, so that the system stably operates.

Claims (5)

A message loss prevention apparatus for a remote switching in a private branch exchange, the apparatus comprising: a message storage unit (25) installed in a sub rack (20) for storing and outputting an applied message; When the E1 line is monitored and the E1 line is faulted, the sub-rack 20 stores a message applied from the switching unit 22 in the message storage unit 25, When the failure of the E1 line is restored, the message stored in the message storage unit 25 is not output to the main rack 10 via the E1 line through the network interface unit 23 and the network interface unit 21, And a control unit (24) for outputting the message to the main rack (10) via the E1 line through the information transfer unit (23) and the network interface (21) Prevention device. The apparatus of claim 1, wherein the message storage unit (25) comprises: an SIO (29) for delivering a message to and from the control unit (24) in series; An SRAM 26 for storing and outputting memory sector information to be applied; A flash memory 28 for storing and outputting an authorized message; A backup battery (BA) for supplying power to the SRAM (26) during a power failure to prevent the memory sector information stored in the SRAM (26) from being erased; Stores the memory sector information of the flash memory 28 in the SRAM 26 while storing a message applied from the SIO 29 in the flash memory 28 and stores the memory sector information in the SRAM 26 in the memory sector information stored in the SRAM 26 And a CPU (27) for accessing the flash memory (28), reading out a message, and outputting the read message to the control unit (24) through the SIO (29) Prevention device. A method for preventing message loss during a long distance switching in a private branch exchange, the method comprising: a first step of storing, in a predetermined unit, a message generated when a switching operation is performed in a sub rack; A second step of monitoring the E1 line connected to the main rack side of the sub rack in the first step and confirming whether a fault has occurred in the E1 line; A third step of not transmitting a message stored in the sub rack to the main rack side via the E1 line if a failure occurs in the E1 line in the second step; A fourth step of checking whether or not the E1 line is normally restored in the sub rack after the third step; A fifth step of transmitting the stored message to the main rack side via the E1 line when the E1 line is restored in the fourth step; And a sixth step of transmitting the stored message to the main rack via the E1 line when the failure of the E1 line occurs in the sub rack in the second step. To prevent message loss. The method as claimed in claim 3, wherein when the sub-rack stores the message in the first step, the message is stored and the memory sector information in which the message is stored is stored in the private branch exchange. Way. The method as claimed in claim 3, wherein, in the fifth and sixth processes, when a message stored in the sub rack is transmitted, the message is read based on the stored memory sector information and is transmitted in predetermined units at predetermined time intervals A method for preventing message loss during remote switching in a private branch exchange.