KR100279559B1 - How to transfer switch software using LAN - Google Patents

Abstract

The present invention provides a switch software transmission method using a LAN of an integrated communication (CTI) technology of a computer and an exchange device of an information communication technology. In the present invention using the CDT (Charging Data Transmitter) equipment for the centralized charging (CAMA), the CDT performs a backup for the preservation of the software or data of the exchange, and at this time, the local exchange is installed through the operating network in the central computer It is a remote software transfer method of the exchanger software that makes it possible to realize economical, unmanned, and automated backup by transferring the software to the CDT and storing the software in a local area. The command is implemented through a GUI implemented in the present invention. Alternatively, when the exchange operator transmits the exchange software transfer command through the MMC, a file may be exchanged between the exchange and the CDT, and if the operator has a backup, the exchange may start transmitting or receiving the file at the specified time in the CDT. And when deemed necessary, You can perform a backup at any time. In addition, file transfer in a simple network structure where only the data link layer is implemented, maintenance of the exchange software using the same, and redundancy control that is dependent on existing redundancy can be performed in a system designed for redundancy. Redundancy of external devices connected between them is also controllable.

Description

How to transfer switch software using LAN

The present invention relates to a computer telephony integration (CTI) technology of information and communication technology. More specifically, the present invention uses a Charging Data Transmitter (CDT) for a Centralized Automatic Message Account (CAMA) connected to an operation preservation network established nationwide and connected to a local area network (LAN) with an exchange. The present invention relates to a method of transmitting an exchange software using a local area network (LAN) in which the CDT automatically performs backup for the preservation of the software or data of the exchange by changing the exchange software by receiving the exchange software from a remote site and transferring the exchange software to the exchange.

In order to ensure the stability of the service and the continuity of the service, the exchange which has many maintenance functions, the software and data are periodically backed up by the exchange software or the data for the subscriber, the trunk line and other exchanges to ensure the stability and continuity of the service. Receives. This backed up data should be preserved to ensure data continuity so that it can be reused when new software is applied or when the database structure is changed. In addition, the exchange software should be backed up periodically to preserve the data backed up or to damage files on the exchange disk.

This series of tasks are all performed using MT (Magnetic Tape), manually operated MTU (Magnetic Tape Unit), and then backed up using the Man-Machine Command (MMC) used by the exchange.

In addition, due to continuous software changes such as starting new services, changing network structures, and making up for problems, the application of new software to exchanges is becoming more frequent. New software applications also use MT.

In the above-mentioned operations, if the data backed up due to the damage of the MT is damaged, not only does the user have to rework the changed data, but also the MT containing the new software is damaged or damaged, and thus the service cannot be continued at the desired time. In some cases, a backup tape of an MT that has been backed up may be produced. In addition, to minimize the impact on the system in operation, it was inconvenient to be executed only at dawn, the minimum time. In addition, since the operation speed of the MTU is not fast at the exchange, it takes a long time to backup, and it is impossible to change the data during the backup operation time, which makes the operation of the exchange less efficient. Since the amount of MT was used nationwide.

Accordingly, it is a first object of the present invention to prevent corruption of backup data more quickly and reliably in exchange software and data backup method or application of new exchange software so that the data backed up by MT damage is not damaged.

In addition, the exchange software exists on the exchange's own disk on a file basis, and after the exchange's data is changed and stored on the exchange's disk, the exchange's maintenance processor is a processor that performs the maintenance function of the entire exchange and collects billing data. Not allocating a lot of resources to the exchange software maintenance.

Therefore, in the present invention, the switch and the CDT are implemented so that the file can be transferred in a simple manner that does not place a heavy load on the switch. The switch software transfer is performed, and only the data link layer is used for the file transfer between the switch and the CDT. It is a second object of the present invention to provide a Simple File Transfer Protocol (SFTP).

1 is a schematic diagram of a CDT and an exchanger in which the present invention is implemented;

2 is a flowchart illustrating a file transfer method according to the software transfer method of the present invention;

3 is a configuration diagram of a protocol according to a software transmission method of the present invention;

4 is a file transfer start message of a protocol according to a software transfer method of the present invention;

Structure diagram of response signal to file transfer start message,

5 shows a new file transfer start message of a protocol according to the software transfer method of the present invention;

Structure diagram of response signal for new file transfer start message,

6 is a structure diagram of a file data transmission message of a protocol according to a software transmission method of the present invention;

7 is a structure diagram of a new file transfer complete message of a protocol according to a software transfer method of the present invention;

8 is a structure diagram of a file transfer end message of a protocol according to a software transfer method of the present invention;

9 is a structural diagram of a file transfer stop message of a protocol according to a software transfer method of the present invention;

10 is a functional processing flowchart of a sub-function duplication processing method according to the software transmission method of the present invention.

Currently, the exchange is equipped with a charging data transmitter (CDT) for Centralized Automatic Message Account (CAMA), which is connected to a national network of operations, and is connected to the local area network (LAN). Connected computer.

The present invention proposes an alternative for changing the exchange software by transferring the exchange software from a remote site to the exchange using the centralized equipment, and the CDT automatically backs up to preserve the exchange software or data. In this way, the economics, unmanned and automated backups were realized.

In the present invention, the software is transmitted to a local CDT in which a switch is installed through an operation preservation network in a central on-machine producing the switch software, and the software is received and stored in a disk. At that time, when an operator or a local operator who accesses the CDT remotely instructs the exchange to apply the software to the exchange, it is applied to the exchange according to the data transfer method of the CDT and the exchange period.

The central computer compiles the program written in the exchange high-level language into an executable binary file and transmits it to the CDT designated by the operator among CDTs installed nationwide through the operation preservation network, and the CDT receives the file and stores it on its own disk. .

The operator remotely accesses the CDT to perform the exchange software change command, or performs the command through the GUI (Graphical User Interface) implemented in the present invention, or if the exchange operator transmits the exchange software transfer command through the MMC, File transfer between the CDTs begins.

In addition, if the operator has a backup for preservation of the exchange software and data, the CDT can start transmitting and receiving the file at the designated time at the interval specified by the operator.

The exchange uses the duplication method as one of the stable service methods and the above functions also require software duplication for stable service control of the function itself, but since the CAMA function already uses duplication of equipment, duplication method to minimize the effect on the CAMA function This is necessary. Therefore, in the present invention, by devising a redundancy control method that is dependent on other functions, it is possible to perform a stable operation by supporting the redundancy method without significantly affecting other functions.

Therefore, the present invention has advantages in terms of reliability, speed, and economy compared to the method using MT, which shortens the time required for changing the exchange software in the past, thereby shortening the service interruption time, and it is advantageous in terms of economics as it can be operated remotely. Do.

In addition, the backup of the data using MT has a disadvantage in that it is impossible to change the internal database of the exchange during the backup, so that the changed data is not preserved during the backup. However, the present invention has the shortcoming of the backup. Is complemented.

In accordance with the exchange software transfer method, the exchange software is periodically backed up for the preservation of the data in the exchange or the software itself, and is frequently changed due to the appearance of new services, the correction of problems, and the addition of new functions.

Maintenance work on such exchange software should be minimized and service should be done quickly and in a reliable manner.

However, the exchange software change or backup method before the present invention takes a lot of time and manpower, and the operation procedure or method is difficult, which makes the operator feel uncomfortable.

Therefore, in the exchange software transmission method of the present invention, an efficient maintenance method of the exchange software using the CDT used in the CAMA function is proposed. The CAMA function is a function that the CDT connected to the exchange receives the charging data from the exchange, stores it on the CDT disk, and then automatically transfers the charge to the central computer system that settles the charge through the X.25 network.

The exchange software resides on the exchange itself's disk on a file-by-file basis and the exchange's data is also changed and stored on the exchange's disk.The exchange's maintenance processor is the processor responsible for the entire exchange's maintenance functions and charging data collection. Can't allocate a lot of computing resources for software maintenance.

Accordingly, the present invention invents a method of transferring a file by a simple method that does not place a heavy load on the switch, and implements the switch software by implementing the switch and the CDT. In addition, the present invention devised a protocol (SFTP: Simple File Transfer Protocol) using only the data link layer (File Link Layer) for the file transfer between the exchange and the CDT, because it does not accommodate all the functions of the commercial file transfer protocol.

The exchange has a redundant processor that is responsible for maintenance and a redundant CDT connected to the redundant processor. Redundant CDT implements four Ethernet cards connected to the exchange and uses SUN's Solaris (2.4.1 or later) as the operating system. As described above, since the exchange processor and the CDT are redundant, it is necessary to manage the redundant state of the LAN, which is a physical layer between the exchange and the CDT. In addition, since it is being used as a concept of redundancy in the CAMA function, there is a need for a method capable of minimizing the influence on the redundancy method used in the CAMA function and supporting the redundancy by itself.

In addition, in order to enable both the CDT operator and the exchange operator to perform the exchange software maintenance, the CDT side implemented the user registration using the GUI, and the exchange used the user registration method through the man-machine command (MMC). In addition, the GUI interfaced environment is impossible for the operator who is connected remotely, so the user registration function is implemented for the remote operator.

Now, a file transfer method between an exchange and a CDT according to the present invention will be described.

The e-Exchange exchanges the status of the CDT connected to the e-Exchanger and the local area network (LAN) connected to the CDT periodically, and checks the state of the exchange, LAN and CDT, and requests the information on the current state or when the operator changes or changes the state. Notify the operator. The inside of the exchange notifies the operator using the exchange message, and the CDT notifies the operator through the graphical user interface (GUI) using X-window.

When the CDT user executes the transmission or reception of the exchange software via the GUI, it is delivered by the internal software to the exchange. Receiving this information, the exchange creates a process to handle the file transfer between the exchange and the CDT, and the exchange software reads the disk file using the CDT and SFTP and starts transmitting and receiving. If an error occurs during transmission or reception, in case of a fatal error, the file transmission / reception operation to the CDT is stopped and the error is corrected by the method defined in SFTP for loss or damage of some data.

When the exchange operator executes the exchange software send or receive request through the Man-Machine Command (MMC), the CDT starts transferring the files in the specified directory to the exchange and notifies the GUI process that the transfer has started. And outputs a variety of information to the screen to inform the operator. In addition, if the CDT designates the start time of the automatic file transmission / reception operation, the file transmission starts at the designated time.

The switch software transmission method using the CDT according to the present invention includes a first step, which is a preparation step through state management and mutual information exchange between the exchange and the CDT, and a second step of receiving and transmitting the exchange software file by receiving the exchange software request. Include.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is an interlocking environment diagram of an electronic exchanger and a CDT in which the present invention is implemented.

As shown in the figure, the environment for the exchange software transfer using the CDT is composed of the CDT 100 and the Ethernet-exchanged electronic exchange 200.

The CDT 100 and the electron exchanger 200 are connected by coaxial cable. The electronic exchange used in the example is composed of a matching circuit 8, a control unit 2, and a file transmission / reception processing unit 10 for work processing of the present invention, and connected to two on-computers for redundancy. Two CDTs 100 ) Mounts two network matching circuits 8, respectively.

Looking at the function of the above components as follows.

The exchange interlocks with the CDT 100 and links using IEEE802.3 and mounts the matching circuit 8 inside the maintenance processor of the exchange. The matching circuit 8 of the exchanger is controlled by a program inside the processor board and transmits and receives data to and from the exchanger O / S 9 (Operating System) 9. At this time, the data transmitted and received is composed of the Ethernet header (Ethernet Header) and the user data.

The exchanger O / S 9 transmits a message related to state management among the messages transmitted from the CDT 100 to the state management unit 2 and transmits data for file transmission and reception to the file transmission and reception unit 10. At this time, the exchange O / S 9 analyzes the address of the Ethernet header information and determines that the message is a status management message or file transmission / reception data.

The state management unit and the control unit 2 receiving the state management message from the O / S (9) analyzes the contents of the message to determine whether the information has been changed, etc. 11) outputs the status change message. In addition, when the state changes, it performs the process of performing state management appropriately to the changed state. The process generated by the state management process periodically exchanges state information, disk usage, process information, work information, etc. of the CDT 100. In addition, the file transmission / reception request received by the CDT 100 is received and the file transmission / reception unit 10 notifies the start of file transmission / reception.

The file transmission / reception unit 10 analyzes the file transmission / reception start notification from the state control unit 2 to distinguish a file transmission or reception and perform a task. If the file transmission start notification is a function started to change the exchange software, the exchange starts to receive the file by the CDT 100 and the Simple File Transfer Protocol (SFTP). Each time the transmission of each file is completed, the message is delivered to the output message unit 11 so that the output message unit 11 outputs the message.

In addition, when receiving a file reception request message from the CDT 100, the exchange transmits file information to read and transmit file information existing on the disk. Start the transfer. Whenever each file transfer is completed, a message is output to the output message unit 11 to output the execution contents.

The user command unit and the output message unit 11 receives a file transmission / reception request start or stop from the exchange operator and transfers the file transmission / reception unit 10 to the file transmission / reception unit 10 to stop or start the file transmission / reception. The exchange operator receives a request for outputting current file transmission / reception information, status information, or job information from the operator terminal 1 to the status management unit and the control unit 2, and transmits the information received from the state processing unit 2 Output (1, 12).

2 is an exemplary diagram of a file transfer method using a data link layer. 2 showing a process flow according to the present invention will be described with reference to FIGS.

The file transfer method using the data link layer of the present invention uses the Simple File Transfer Protocol (SFTP) and the file transfer protocol will be described below. SFTP is a protocol that can directly send and receive files in the data link layer (all links that allow transmission and reception of data by connecting one system to another such as RS-232C, Ethernet, Token Ring, modem, and wireless modem). According to the present invention, the SFTP protocol which directly transmits and receives data formats by using the data link layer, provides a reliable file transmission method, and operates on any data link assuming that the data link is both connectionless and connection-oriented. In this way, in order to exchange reliable information, an ACK signal for each packet is used during transmission and reception so that packets transmitted and received by an application program are correctly transmitted to the other party. If the transmitted packet is not received correctly, retransmission is performed automatically.

In addition, SFTP is composed of a control signal and a response signal to the control signal in order to reliably perform file transfer, which is shown in FIG.

In Fig. 2, the control signal of the START_XFER (file transmission and reception start message) 13 is a signal used for the purpose of transmitting and receiving a file and for transmitting and receiving file information to be transmitted and received. As can be seen from the data structure shown in Fig. 4, when the acknowledgment signal for the START_XFER 13 is able to perform normal file transmission and reception, the START_XFER_ACK (file transmission and reception start response message) 14 receives the acknowledgment signal. If not, it can receive STOP_XFER (file transfer stop message) signal 34.

In the control signal structure of FIG. 4, the signal type 36 is a predetermined value that can distinguish the signal type, and the transmission file type 37 is a value indicating the type of the file. Files, data related to the exchange internal database, and so on. The number of files to be transmitted 38 is a value indicating the number of files to be transmitted and received. If the number of files to be transmitted and received is less than eight, the file name 39 and the file size 40 are set after setting the values to the file type 37 to be transmitted. Set file name and size values sequentially. Set whether to include the compressed file 41 is a value that is set when the compressed file includes the compressed file, otherwise it is not used, and the directory is a value used when transmitting file information from the exchange to the CDT 100. A string that refers to a specific directory in. In order to ensure the reliability of the control signal, the control signal displays a checksum 43 representing the sum of the data values of the signal itself.

NEW_FILE_XFER (New File Transfer Start Message) 26 of FIG. 3 is a control signal for notifying the other party of the file information before starting to transmit the contents of the file. If a NEW_FILE_XFER_ACK (new file transfer start response message) 27 is received and the file transfer cannot be performed due to the cause of the state side, the STOP_XFER 34 transmitted from the state side can be received. The data structure of the NEW_FILE_XFER (26) control signal is shown in FIG. 5, and in FIG. 5, the signal type 44 is a predetermined value indicating that it is a NEW_FILE_XFER (26) control signal, and the file number 45 is a file transmission / reception serial number and a file size. (46), the file version name 47, and the file name 48 are information about the file, and the compressed file 49 is a value to be filled in when the compressed file is a compressed file. In addition, the checksum (50) value is set to guarantee the integrity of the control signal.

The XFER (file data transfer message) 28 control signal of FIG. 3 is a signal transmitted when the contents of the actual file are transmitted, and the signal type 51 indicating the actual data of the file as shown in FIG. A sequence number 52 representing the accumulated serial number, a size 53 representing the size of the currently transmitted data and having a value from 1 to 1024, transmission data 55 for transferring the contents of the file up to 1024, transmission data It consists of a checksum (54) indicating the sum of. In response to this control signal, XFER_ACK (file data transfer response message) 29 is received, and in abnormal cases, STOP_XFER 34 may be received.

The ONE_FILE_END (new file transfer completion message) 30 signal of FIG. 3 is a signal for notifying the other party that one file transfer is completed after one file transfer is completed, and the received status is ONE_FILE_END_ACK (new file transfer completed). Response message) 31, and in case of abnormality, STOP_XFER 34 may be received. The structure of the ONE_FILE_END 30 control signal is shown in FIG. 7 and the signal type 56 of FIG. 7 is filled with a value indicating that it is a ONE_FILE_END 30 signal, and the state 57 is an error value determined as a value indicating a transmission result. Fill it.

The control signal of the END_XFER (file transfer completion message) 32 of FIG. 3 is a signal indicating that all the file transmission / reception operations are completed. This signal is not received a response signal other than the END_XFER_ACK (file transfer completion response message) 33.END_XFER (30) The signal consists only of the signal type 59 and the checksum 60.

The control signal and the response signal described above have a predetermined rule for sending and receiving a file, and the SFTP protocol is a protocol in which the control signal and the response signal and the order of the control signal and the response signal are determined to transmit and receive a file.

The file transmission and reception process using SFTP will be described in detail below.

There are two types of file transfer requests. The first method is a case where system A makes a file transfer at the request of system B, and the second method is a case where system A requests that system B send its own file. In the case of the first method, when system B requests file transfer start from system A, system A transmits START_XFER (13) as a signal to start the transfer. If System A cannot accept the request of System B, it responds with STOP_XFER (34). In the case of the second method, the system A transmits a file without the request of the system B. If the system B responds with a START_XFER_ACK 14, the system A may transition to the next step. If System B is unable to receive the file, it can respond with STOP_XFER 34. The system receiving the STOP_XFER (34) sends the STOP_XFER_ACK (35) and stops the file transfer. The request to stop the file transfer can be requested by both System A and System B.

The system receiving the START_XFER_ACK (14) sends the NEW_FILE_XFER (15) signal to inform the other system that a new file is being sent. The opposing system responds to this signal with NEW_FILE_XFER_ACK (16) or STOP_XFER (34). The system that receives NEW_FILE_XFER_ACK (16) transmits the XFER (17) signal to transmit the data of the file to be transmitted. The receiving system sends XFER_ACK 18 to inform the transmitting side that the received data is correct. In this case, the receiving side may also send STOP_XFER 34 to stop the transmission. The side receiving the STOP_XFER 34 immediately responds with STOP_XFER_ACK 35 and stops the transmission. This process is repeated until the transmission of the current transmitting end. When the transmission is completed, the ONE_FILE_END (19) signal is sent to the receiver to indicate that the transmission of the has been completed. The receiving side may send ONE_FILE_END_ACK 20 or STOP_XFER 34 if it is normally received.

The sender checks if there is a next time to send and sends a NEW_FILE_XFER (21) signal for the next time if there is a time to send. This process is repeated until the entire transfer is complete. If all of the transmissions are successful, the sender transmits END_XFER 22 to inform the receiving end that the transmission is completed. The receiving end can respond with END_XFER_ACK 23 or send STOP_XFER 34.

If the transmission data 55 of the XFER 28 signal is received during normal file transmission and reception, the XFER_ACK 29 notifies the normal reception, but the error such as a failure in data link, software error, loss of data, etc. May occur. Therefore, in order to overcome the error caused by this cause, the error is corrected by the following process.

If the next data does not come after a certain time has elapsed since the transmission starts, or if the sequence number 52 of the XFER (28) signal is duplicated or not in the serial sequence, the receiver regards the packet as lost and transmits the previously transmitted packet once more. . The sender decides the next packet to transmit based on the received packet. When one reception is completed (after receiving ONE_FILE_END (30)), the receiver transmits ONE_FILE_END_ACK (31) to transmit the next. At this time, if the receiving side wants to receive the currently received, it may request retransmission by setting the state 51 field of the ONE_FILE_END_ACK 31 to 1. Retransmission follows the same process as normal transmission. In addition, both the transmitting and receiving sides can set the stop reason at any time and request the transmission to be stopped, and the side receiving the STOP_XFER 34 stops the transmission immediately after transmitting the STOP_XFER_ACK 35.

10 is a diagram illustrating sub-function duplication processing.

Sub-function duplication processing is used when the existing duplication system is called main function duplication system and needs to implement its own duplication on main function duplication system.

Sub-function redundancy processing is as follows.

First, it is determined whether the information received by the system is information that manages the redundancy status of the main function system, and if it is not the redundancy status management information of the main function system (65). If the redundant management information of the main function system is compared with the state management information data of the previous main function system, it is checked whether the state of the watchdog steam has been changed (66). If the status information of the main function system has not changed, check whether the current sub function system operates in STANDBY mode (70). If the current sub-function system is not in STANDBY mode (ACTIVE mode), the current bush steam status information is transmitted (71) to the STANDBY mode of the bush steam. Status management information is ignored if the current subsystem is in STANDBY mode.

If the status information of the main function system has changed, check that both the ACTIVE and STANDBY systems exist (67) in the main function system. If only the ACTIVE exists in the main function system, it verifies that the current system is ACTIVE of the main function system (68). If the main function system is ACTIVE, set it as the sub function ACTIVE system (72). If the current system is not the active system of the main function system, the status information is ignored.

If both the ACTIVE and STANDBY systems exist in the main function system, the system checks whether the current system is the active team's activity (69). If the current system is not ACTIVE of the main function system, it is set as ACTIVE of the sub function (72) and the current status of the bush steam is transmitted to the STANDBY system of the sub function. However, if the current system is the ACTIVE of the main function system, it is set as the STANDBY system 73 of the sub function.

The software transmission method of the exchange according to the present invention reduces the manpower, time and cost input for the electronic exchange 200 software maintenance, and hassle to make a backup of the exchange software or data periodically using a separate storage medium. There is an advantage to reduce wool.

The present invention provides a file transfer method in a simple network structure in which only the data link layer is implemented, and a redundant control scheme dependent on existing redundancy in a system designed for maintenance and redundancy of the exchange software using the same, and an exchange and a switch using the same. Redundancy control method of external device connected to. This reduces maintenance costs of the exchange software and data, ensures reliability and speed of maintenance, continuity of service, and consequently promotes the convenience of exchange operators.

Claims (10)

In the exchange software transfer method, And a charge transfer device (CDT) 100 and an electronic exchange 200, wherein the CDT 100 is connected to the electronic exchange 200, Transmitting and receiving a user command and file by the user command and file transmission / reception unit 3; Performing a user command input / output function by the GUI interface 5; The transmission and reception message processing unit 7 is provided, and the file transmission and reception unit 3 and the state management unit 6 are analyzed, separated, and transmitted between the (5) and the (7) by (7). (6) functioning in the case of a status packet according to the data packet, and (3) in the case of packets other than the status packet; Transmitting, by the state controller 2, a state management message among the messages transmitted from the CDT 100 by using a LAN matching function provided by the exchange O / S 9; Analyzing the file transmission and reception start notification from the state processor (2) to discriminate file transmission or reception and to transmit data to be performed by the file transmission / reception unit (10); And, Receiving a message from the O / S (9), the state manager and the controller (2) analyzing the content of the message to determine whether or not to change the information; A user command and output message processing unit (11) receiving the messages from the state control unit (2) and the file transceiving unit (10) and outputting them to the output devices (1) and (12); And, And outputting a status change message. The method of claim 1, Changing the switch software when the transmission and reception message processing unit (7) notifies the start of file transmission in the user command and file transmission / reception step; And, The exchanger (200) is characterized in that it comprises the step of receiving a file by the CDT (100) and SFTP protocol. The method of claim 1, In the user command and file transmission / reception unit stage, the output message unit 11 receives a file transmission / reception request start or stop from the exchange operator and transfers the file transmission / reception unit 10 to the file transmission / reception unit 10 to stop transmission or reception of the file. Starting step; And, And outputting a message each time the transmission of each file is completed. The method of claim 1, In the step of inputting and outputting the user command, the switch 200 receives a request for outputting current file transmission / reception information, status information and job information from the operator terminal 1 and transmits the request to the status manager and the controller 2; And, And (1, 12) outputting the information received by the state processor (2). The method of claim 1, The state management unit and the control unit 2 is dependent on the duplication method existing between the electronic exchange 200 and the CDT 100 in the step of analyzing the content of the message to determine whether the information changes, etc. And exchanger software transfer method. The method of claim 1, CDT 100 backup or exchange at the request of the operator of the CDT 100 or the exchange in the step of transferring the data to perform the operation by the file transmission and reception unit 10, or during the dump operation performed for the exchange software and data preservation And executing a change of the software. The method of claim 1, Transmitting and receiving of a file between the exchange and the CDT (100) is a control method of SFTP, the control message and the response message, characterized in that it comprises the step of transmitting and receiving the file, the software software. In the sub-function duplication process, Determining whether the information received by the system is information for managing the redundancy state of the main function system (step 65); Disregarding the duplication status management information of the main function system (65); If the redundant management information of the main function system, comparing the state management information data of the previous main function system to check whether the state of the watchdog steam has been changed (66); If the status information of the main function system is changed, checking whether both the ACTIVE and STANDBY systems exist in the main function system (67); If both the ACTIVE and STANDBY systems are present in the main function system, checking whether the current system is the active team's activity (69); If the current system is not the ACTIVE of the main function system, setting it to ACTIVE of the sub function (72); Transmitting information (74) of the status of the current bush steam to the STANDBY system of the sub function; Setting 73 as a sub function STANDBY system if the current system is ACTIVE if the current system is ACTIVE in the investigation step 69; And, And terminating the state processing (75). The method of claim 8, If only ACTIVE exists in the main function system in step 947), checking whether the current system is ACTIVE of the main function system (68); Setting 72 as the sub function ACTIVE system if the main function system is ACTIVE; And, If the current system is not the active system of the main function system, the duplication processing method comprising the step of ignoring the status information. The method of claim 8, Checking whether the current sub function system is operating in the STANDBY mode if the state information of the main function system has not been changed in step 66; If the current sub-function system is not in the STANDBY mode (ACTIVE mode), transmitting the current bush steam status information to the STANDBY mode of the bush steam (71); And, If the current sub-function system is in STANDBY mode, the redundancy processing method comprising the step of ignoring the status management information.