KR100216525B1 - On-line data storage in atm exchange - Google Patents

Abstract

The present invention relates to a method of using and managing a remote device for storing a large amount of on-line data generated in an ATM switching system. The device of the present invention communicates with call processing processors via a central switch in an ATM switch to manage management information. Operation management means for sending and receiving, temporary storage means for temporarily storing information of the operation management means, remote device means connected to the operation management means via Ethernet, and operation management means transmitted through the remote device means. Storage means for storing information of the remote device, the method comprising: initiating service of a remote device, receiving a coupling request signal from the exchange side, combining the remote device and the exchange side, and accessing the remote device; Performing and transmitting the results to the exchange side, testing the remote device, and remote file control Transmitting the old signal, controlling the remote file at the remote device, stopping the service of the remote device at the exchange side, and isolating the remote device and the exchange side. Since there is no direct effect on the exchange system, interference with the switching function is reduced, thus ensuring device independence.

Description

Apparatus and Method for Online Data Storage in ATM Switching System

The present invention relates to a method of using and managing a remote device for storing a large amount of on-line data generated in an ATM switching system. In the conventional exchange, a storage device necessary for an operation preservation processor is directly attached and used for an additional device. Control board and software driver are installed and managed.

The conventional method as described above has the following disadvantages.

First, additional hardware devices must be associated with the exchange management preservation processor, and device drivers must be interoperated with the exchange processor operating system. The operating system for the exchange is not a general-purpose operating system, which places importance on real time.

Therefore, the linkage of such a driver consumes a lot of effort and time.

Secondly, management and operation software are additionally required to maintain operation for such conventional devices, which degrades the performance of the exchange.

Accordingly, the present invention is to provide a device and method for storing the online data generated in the ATM switch consisting of a large software to a remote device mounted in the operating system to compensate for the above disadvantages.

1 is a diagram illustrating a connection structure between an ATM switch system and an operation workstation according to an embodiment of the present invention.

2 is an implementation block diagram for storing online data according to an embodiment of the present invention.

3 is a flow diagram of a remote device state transition in accordance with an embodiment of the present invention;

4 is a flowchart of a remote device service start and stop processing on the OMP side according to an embodiment of the present invention;

5 is a flowchart of remote device coupling and isolation processing on the OWS side according to an embodiment of the present invention;

6 is a flowchart of a remote device status monitoring process on the OMP side according to an embodiment of the present invention;

7 is a flowchart of a remote device access request processing on the OWS side according to an embodiment of the present invention;

8 is a flowchart of a remote device test process on the OMP side according to an embodiment of the present invention,

9 is a flowchart of a remote file control process on the OMP side according to an embodiment of the present invention;

10 is a flowchart of a remote file control process on the OWS side according to an embodiment of the present invention.

The apparatus for the online data storage of the ATM exchange provided by the present invention is in charge of the operation management and maintenance function of the ATM exchange, the operation management means for communicating with the call processing processors through the central switch in the software to exchange management information, and Temporary storage means for temporarily storing information of the operation management means, remote device means connected to the operation management means via Ethernet, and storage means for storing information of the operation management means transmitted through the remote device means. The method of the present invention comprises a first step of starting a service of a remote device at an exchange side and transmitting a signal requesting the association of the exchange side and a remote device to the remote device; A second step of receiving a signal and coupling the remote device and the exchange side, and the second step at the exchange side Monitoring the status of the combined remote device and transmitting an access signal to the remote device; and receiving a remote device access signal from the exchange side at the remote device to perform remote device access and transmitting the result to the exchange side; A fourth step of receiving a remote device test request from the exchange side and testing the remote device, a sixth step of transmitting a remote file control request signal to the remote device according to a request inside the exchange, and the remote file control A seventh step of controlling the remote file at the received remote device, and an eighth step of stopping the service of the remote device from the exchange side and transmitting a signal requesting isolation from the exchange side and the remote device to the remote device; And a ninth step of isolating the remote device and the exchange side by receiving the isolation request signal from the exchange side. The present invention will be described in detail.

FIG. 1 is a diagram illustrating a connection structure between an ATM switch system and an operating workstation according to an embodiment of the present invention, and FIG.

Referring to FIG. 1, a connection between an ATM exchange system 11 and an operation workstation server 12 for performing a use and management function of a remote device for storing online data generated at an exchange is shown. Is performed by Ethernet communication between the OMP (Operation and Maintenance Processor) 13 and the workstation 14 in the ATM exchange system 11, and is used at the application process level. The entity is an IPC server on the OMP 13 side and an IPC daemon on the OWS 12 side.

This is a function in which the IPC function used in the exchange side 11 is ported to the OWS 12, and converts a packet transmitted and received through an Ethernet server into an IPC form to provide an interface with an application process. Thus, an application programmer can program the OWS 12 as if it were a processor inside the exchange.

The OMP 13 is a processor mainly responsible for the operation management and maintenance functions of the ATM switch 11, and is connected to an ATM Central Switch Subsystem (ACS) 15 in the ATM switch 11 to call control processor ( CCCP: Call Connection Control Processor (16) is exchanged with management information by IPC communication. Therefore, there are charging and statistical processors in the OMP 13 and they temporarily store online data on the system disk 17.

As described above, the online data stored in the system disk 17 is recorded and stored in the magneto optical disk (MOD) 8 of the OWS 12 at a specific point in time.

Referring to FIG. 2, an implementation block for use and management of a remote device includes an OMP 13, an OWS 12, a system disk 17 connected to the OMP 13, and an OWS 12. It consists of a connected MOD 18.

At this time, the OMP 13 includes a remote device use reference (LIBRFS) 21 which provides a remote device use primitive to application processes on the exchange side, and the system disk 17 and the remote device. And a disk device management function (DKDMF) 22 for testing, monitoring, and managing the MODs 18 as devices.

The LIBRFS 21 provides a method in which the use of a remote device is almost similar to using a device attached to an exchange.

In addition, the OWS 12 receives a usage access or management access to a device directly accessible from the exchange among the devices attached to the remote device, and transmits the result of performing the result to the exchange (WSDMF: Workstation Device Management). Function (23) and a remote device operating unit (WSOS) for managing primitives of devices attached to the remote device and delivering the primitives to the WSDMF 23 upon request of the WSDMF 23. It consists of.

At this time, the operation of the WSDMF 23 and WSOS 24 supports transparency so that it is not necessary to know whether the remote devices are attached to the exchange or to the operating workstation. Therefore, the exchange operation preservation processor uses IPC over Ethernet to access the remote device as described above, and manages its state inside the exchange to determine the availability of the device. Consider and use as attached.

3 is a flowchart of a remote device state transition according to an embodiment of the present invention, and FIG. 4 is a flowchart of a remote device service initiation and mediation processing on an OMP side according to an embodiment of the present invention, and FIG. 5 is a flowchart according to an embodiment of the present invention. FIG. 6 is a flow chart of a remote device association and isolation process on the OWS side, and FIG. 6 is a flow chart of the remote device status monitoring process on the OMP side according to an embodiment of the present invention, and FIG. 7 is a remote device access request on the OWS side according to an embodiment of the present invention. 8 is a remote device test processing flowchart on the OMP side according to an embodiment of the present invention, and FIG. 9 is a remote file control processing flowchart on the OMP side according to an embodiment of the present invention, and FIG. It is a flowchart of a remote file control process on the OWS side according to the embodiment.

Referring to FIG. 3, the state of the remote device may be initialized (31), normal state (32), abnormal state (33), block state (34), fault state (Fault) state There is 35.

The relationship between the above states is first transitioned to the normal state 32 when the initialization is normally performed in the initialization state 31 which performs the initialization of the device, and otherwise to the abnormal state 33.

The normal state 32 transitions to an abnormal state 33 when a malfunction occurs by its own periodic monitoring function, and conversely, when a normal state is found in the abnormal state 33, the normal state 33 is transferred.

However, if the abnormal state 33 continues N (5 to 10 times) by periodic monitoring, it is regarded as a failure and transitions to the fault state 35.

At this time, when the remote device generates an alarm to inform the operator of the fault state 35, the operator measures the fault state 35, and then tests and determines the normal state of the remote device to the normal state 32 when it is determined to be normal. Transfer.

In addition, the block state 34 is a state transitioned when the operator terminates the service, and is possible only in the normal state 32 and the fault state 35. In the block state 34, it is possible to transition to the normal state 32 by the service registration or to the initialization state 31 by restarting the module.

The five types described above can be divided into a use state and a management state. The use states are initialization (31), normal (32), and abnormal state (33), and the management state is a block (34) and a failure state (35). )to be.

Referring to FIG. 4, the procedure of processing in the DKDMF 22 block on the OMP 13 side for remote device service start and stop is first started by receiving a service start or stop signal by the operator (401, 408). The case of remote device service initiation is described first.

When the DKDMF 22 of the OMP 13 receives the remote device service start signal (401), it reads the state of the remote device selected to start the service (402), and checks whether it is out-of-service (OOS). 403 sends a remote device association request signal 404 to the WSDMF 23 of the OWS 12 if it is not in service.

Then, in order to receive the execution result from the WSDMF 23, the reception wait timer is set 405 and the reception wait 406 is entered.

The OOS check result 403, if it is in service outputs (407) that the corresponding remote device is in service and ends.

In addition, the DKDMF 22 of the OMP 13 receives the service stop signal by the operator (408), reads the status of the remote device to perform the service stop (409), and checks the INS (In-Service) (401) When in service, the WSDMF 23 transmits a remote device unmount request signal 411.

Then, in order to receive the performance result from the WSDMF 23, the reception wait timer is set 405 and the reception wait 406 is entered.

If the result of the INS check 401, if the service is stopped, the output is 412 that the remote device is currently stopping the service and ends.

In addition, when receiving the device combination result signal from the WSDFM 23 in the reception standby state 406 (413), a remote device service start result message is output, and the state of the remote device is changed to normal (416). When receiving the device unmount result signal (414), the remote device service stop result message is output, and the state of the remote device is changed to the block state (417). In response to receiving the time-out signal (415), the non-response message is output (418) and then terminated.

Referring to FIG. 5, the remote device joining and isolation processing attempts to access the device when the OWS 12 receives the remote device mount request signal 501 from the DKDMF 22 block of the OMP 13. 502).

If the access 502 is not accessible, the device mount primitive is called to perform a device mount command (504), and then the execution result is sent to the OMP 13 side (505), otherwise immediately. The device mount result signal is transmitted to the OMP side (505) and terminates.

If a remote device unmount request signal is received (506), the device attempts to access the device (507), and if the access is available, the device unmount primitive is called to execute the command (509), and then the execution is performed. The resultant signal is transmitted to the OMP 13 side (501). Otherwise, the device unmounted result signal is transmitted to the OMP side (501) and then terminated.

Referring to FIG. 6, in the process for remote device state monitoring, first, when a watcher is generated, the viewer starts with the watch initialization state and repeats the watch initialization state through the watch wait state and the reception wait state.

The repetition cycle as described above depends on the monitoring cycle and can be changed by the operator's command. In the monitoring initialization state, the monitoring period is read from the performance monitoring and control relation stored in the database to set the monitoring request timer (601), and then enters the monitoring waiting state (602) to wait for the monitoring request signal.

In the monitoring standby state 602, after receiving the monitoring request timeout signal (603), the device installation information is read (604) to confirm whether it is currently installed (605), and if it is not installed, it returns to the monitoring initialization state.

If it is being installed, the remote device access signal is transmitted 606 to the WSDMF 23, and then enters the reception standby state 607 to receive the result, and in the reception standby state 607 the remote device access result signal. Receive 608.

After checking the state of the received device (609), if it is normal, change the remote device state information to normal and initialize the abnormal number (601) and return to the monitoring initialization state. If abnormal, the abnormal number is the threshold (5 to 10 times). (611), if exceeded, changes the remote device status information to a failure and increases the number of abnormalities (613). If the abnormal number does not exceed the threshold, the remote device status information is changed to abnormal and the abnormal number is changed. It increments (612) and then returns to the watch initialization state.

Referring to FIG. 7, the remote device access request processing is a procedure performed by the WSDMF 23 on the OWS 12 side. When the remote device access signal 701 is received from the OMP 13 in the standby state, the corresponding device Open and close the function (702), check the function normal (703) and if it is normal, send the remote device access normal result signal (704) to the OMP (13) and enter the standby state, if abnormal, the remote device access is abnormal The resultant signal 705 is transmitted to the OMP 13 and enters the standby state.

Referring to FIG. 8, the remote device test process is a procedure performed by the DKDMF 22 block on the OMP 13 side, and when the remote device test request signal 801 is received from the operator in the standby state, The state is read (802) to confirm that it is testable (803), and if possible, the test is performed according to the following test procedure. The test procedure confirms the creation of the remote file (804), confirms the opening of the generated file (805), confirms the writing of the data to the file (806), reads the written data (807) After comparison 808, the location movement function of the pointer of the remote file is confirmed (809) and the file is closed (810). Then, the function of deleting the remote file is confirmed (811). At this time, it is checked whether all the previous steps of the test procedure are normal (812), when all the test procedures are normal, and outputs a test result normal message (813), if at least one abnormality occurs, outputs an abnormal message and its cause message ( 814). If the test is impossible, the test returns to the standby state after outputting the test not message (815).

Referring to FIG. 9, the remote file control process requests control of the remote file from the OMP 13 side LIBRFS 21 to the OWS 12 and WSDMF 23, and outputs the processed result for the request. It consists of steps.

First, when rcreat 901 is requested to create a remote file in a standby state, the remote file generation request data is configured (908), and then a remote file generation request signal is transmitted (915) to the WSDMF 23. In order to wait for the execution result, the reception wait timer is set 922 and the reception wait state 923 is entered.

Rdelete (902) to request remote file deletion, ropen (903) to request remote file open, rclose (904) to close remote file, rread (905) to read remote file, remote file Even if rwrite 906 requesting the write of rl and rlseek 907 requesting the movement of the remote file are called, the same process (909 to 914 and 916 to 921) is performed as the rcreat.

When the remote file execution result is received 924 in the reception waiting state 923, the normal file is determined (925), and if it is normal, a request result normal message is output (926), and if abnormal, an abnormal message (927) is output. If the reception timeout signal 928 is received in the reception waiting state 923, an unresponsive message is output (929) and returned to the standby state.

Referring to FIG. 10, the remote file control process is a procedure processed by the WSDMF 23 block of the OWS 12. When the remote file creation request signal is received 101 in the standby state, the file creation primitive is called 108. And a file creator message to the requester (115).

At this time, when the remote file deletion request 102 is received, the file deletion primitive is called 109, and then a file deletion completion message is transmitted to the requester 116. When the remote file opening request 103 is received, the file open primitive is received. After the call 110, the file open completion message is sent to the requester (117). When the remote file close request 104 is received, the file close primitive is called (111) and the file close completion message is sent to the requestor (118). When the remote file read request 105 is received, the file read primitive is called 112, and then a file read completion message is sent to the requester 119. When the remote file write request 106 is received, the file write primitive is called. After the file write completion message is sent to the requester (120), when the remote file move request (107) is received, the file move primitive is called (114) and the file move pointer message is sent to the requester. The new 121.

By using the apparatus and method of the present invention as described above, since the interference between the operating system of the exchanger and the device driver is eliminated, it is possible to obtain the same effect as if the device is attached to the exchange in a one-reaction program using only a communication function. Provides simplicity of use and management software without putting a strain on the preservation processor.

In addition, the device can be easily attached or detached without affecting the exchanger, and since the failure or failure of the device does not directly affect the exchanger system, it reduces interference of the exchange function to ensure device independence, and provides device independence and device interoperability. It increases performance and improves the quality of service.

The apparatus and method of the present invention can also be applied to other large exchange systems.

The present invention provides an apparatus and method for online data storage of an ATM switch that stores online data such as billing data or statistical data generated at the exchange in a remote device installed in the operation system using a communication function between the ATM switch and the operation system. It aims to provide.

Claims (23)

Operation management and maintenance functions of the ATM exchange, including a remote device usage reference section that provides application process on the exchange side with a remote device usage primitive, and a disk management section for monitoring and testing the status of temporary storage means and storage means. It manages and communicates with the call processing processors through the central switch in the ATM switch, and the operation management means for transmitting and receiving management information, temporary storage means for temporarily storing the online data processed by the operation management means, Ethernet A remote device management unit connected to the operation management means and receiving a use access or a management access to a device directly accessible from the exchange, and transferring the result of the execution to the exchange, and a primitive of the device attached to the remote device means; The remote device upon request of the remote device manager; On-line data of an ATM switch comprising a remote device operating means comprising a remote device operating unit for transmitting a primitive to a remote unit, and a remote device storing means for storing information of the operation management means transmitted through the remote device operating means. Device for storage. A remote device for storing the on-line data generated at the exchange, the exchange management preservation processor (OMP) 13 in the ATM exchange system 11, and an operating workstation server for performing the use and management functions of the remote device. 12) is connected by the Ethernet communication between the workstations 14, and converts the packets transmitted and received through the Ethernet server to the IPC form to provide an interface with the application process, the OMP 13 temporarily stores the online data A method for storing online data of an ATM switch for storing the temporary data and storing the online data in a storage device (MOD) 18 of the operating workstation server 12 at a specific point in time. Initiating service of a remote device and transmitting a signal to the remote device requesting the association of the exchange side with the remote device; A second step of combining the remote device and the exchange side by receiving the coupling request signal of the exchange side; and a third step of monitoring the state of the remote device coupled as a result of the second step on the exchange side and transmitting an access signal to the remote device; And a fourth step of receiving a remote device access signal from the exchange side at the remote device to perform remote device access and transmitting the result to the exchange side, and receiving a remote device test request at the exchange side to test the remote device. A fifth step of transmitting a remote file control request signal to a remote device according to a request inside the exchange, a seventh step of controlling a remote file from the remote device that has received the remote file control request signal, and the exchange side An eighth step of stopping a service of a remote device and transmitting a signal to the remote device requesting isolation between the exchange side and the remote device; Receiving the quarantine request signal from the base station, and performing a ninth step of isolating the remote unit and the exchange side, the remote unit is divided into an initial state, a normal state, an abnormal state, a block state, and a fault state to perform periodic monitoring in a normal state. If a malfunction occurs, the system transitions to an abnormal state. If the abnormal state persists by periodic monitoring, it transitions to a faulty state and generates an alarm. In the normal state and failure state, the operator transitions to the block state when the service is canceled, and periodically transitions the function monitoring to the lower state by transferring the service from the block state to the normal state by registering the service. An online data storage method for an ATM switch. 3. The method of claim 2, wherein the first step comprises the step 11 of receiving a remote device service start signal from the inside of the exchange, and checking whether the state of the remote device is in service, and transmitting a join request signal to the remote device if not in service. , If the service is in progress, outputting the service message of the corresponding remote device and ending the service; and setting a reception waiting timer to receive a result from the remote device according to the request signal of the twelfth step, and then receiving the received signal. A thirteenth step of waiting, and if the signal received from the remote device is a combined execution result signal, outputting a remote device service start result message, changing the state of the remote device to normal, and outputting an unresponsive message if the timeout signal is received. Online data storage method of the ATM switch, characterized in that consisting of 14 steps. 3. The method of claim 2, wherein the eighth step includes receiving a remote device service stop signal from the inside of the exchange, and checking whether the state of the remote device is in service, and transmitting a quarantine request signal to the remote device if the service is in service. Set a reception waiting timer for receiving a result of the execution from the remote device according to the request signal of step 82 after outputting a service stopping message of the remote device if not in service; Outputting a remote device service stop result message if the signal received from the remote device is a quarantine result signal, changing the state of the remote device to a block, and outputting a non-response message if the signal is timed out; On-line data storage method of the ATM switch, characterized in that step 84. The method of claim 2, wherein the second step comprises: a twenty-first step of receiving a remote device join request signal from the exchange side; a twenty-second step of attempting to access the remote device; And a twenty-third step of outputting the device combining result signal to the exchange side and if not accessible, performing a device combining command and then outputting the device combining result signal to the exchange side. 3. The method of claim 2, wherein the ninth step comprises a step 91 in which the remote device receives a remote device dump request signal from the exchange side; a step 92 of attempting to access the remote device; And performing a device isolation command and outputting an isolation result signal to the exchange side, and if not accessible, outputting the device isolation result signal to the exchange side without performing the command. The method of claim 2, wherein the third step comprises a thirty-first step of generating a watcher on the exchange side, and a thirty-second step of waiting for monitoring after reading a watch cycle stored in a database by the watcher and setting a watch request timer. And step 33 of reading the device installation information by receiving the monitoring request timeout signal from the inside of the exchange, and checking whether the device installation information read in the step 33 is being installed and returns to the monitoring initialization state if it is not installed. Step 34 of waiting for a result signal from the remote device after transmitting the remote device access signal to the remote device; and if the remote device access signal is received from the standby result remote device of step 34, whether the corresponding remote device is normal. In step 35 of checking, and if the corresponding remote device is normal as a result of step 35, the remote device state is changed to normal and the abnormal number is initialized. After returning to the monitoring initialization state, if it is abnormal step 36 of checking whether the abnormal number exceeds the threshold number of times, and if the check result of step 36 exceeds the threshold number of times, the remote device state information is changed to a failure and the abnormal number is increased. Returning to the monitoring initialization state, and if the threshold number of times is not exceeded, changing the remote device state information to an abnormal state and increasing the number of abnormalities; and then returning to the monitoring initialization state. 4. The method of claim 2, wherein the fourth step comprises a step 41 in which the remote device receives a remote device access signal from the exchange side, and whether the function is normal after the remote device receiving the remote device access signal performs an opening and closing operation. A step 42 for checking and a step 43 for returning a remote device access normal result signal to the exchange if the result of step 42 is normal, and returning to a standby state after transmitting a remote device access abnormal result signal to the exchange if abnormal. An online data storage method for an ATM switch. 3. The method of claim 2, wherein the fifth step comprises the step of checking whether the remote device test request is received from the operator to the exchange side and whether the test state is readable by reading the state of the remote device from which the test request is received in step 51. Step 52, and if it is impossible to test the result of step 52, outputting a test impossible message and entering a standby state, and if possible, checking the remote file creation; and, if possible, opening and writing the remote file generated as a result of step 53. Step 54 of reading the written data after comparing the data with the data written and read in step 54, and then checking a pointer position movement function of the remote file; and closing the file of step 55 After the 56th step of confirming the deletion function and the test procedures of the 53rd through 56th steps, if all procedures are normal, a test result normal message is outputted. 57. A method for storing online data in an ATM switch, comprising the step 57 of outputting an abnormal message. The reception waiting timer according to claim 2, wherein the sixth step comprises configuring a remote file generation request data when the received remote file control signal is a remote file generation signal to transmit a remote file generation request signal to a remote device and waiting for execution completion. A sixty-one step of setting a signal; and a sixty-second step of checking whether the signal received in the sixty-one step is a normal result of the remote file request execution result; and outputting a request result normal message if the result of the sixty-second step is normal; And if it is abnormal, outputting an abnormal message and returning to a waiting state. 11. The method of claim 10, wherein in step 61, if the received remote file control signal is a file deletion signal, the remote file deletion request data is configured to transmit a remote file generation deletion signal to a remote device and to wait for an execution result. On-line data storage method of the ATM switch, characterized in that for setting. 11. The method of claim 10, wherein in step 61, when the received remote file control signal is a remote file open signal, a remote standby file open request data is configured to transmit a remote file generation open signal to a remote device and to wait for an execution result. Online data storage method of the ATM switch, characterized in that for setting. 11. The method of claim 10, wherein in step 61, when the received remote file control signal is a remote file close signal, a remote standby file close request data is configured to transmit a remote file generation close signal to a remote device and wait for an execution result. Online data storage method of the ATM switch, characterized in that for setting. 11. The method of claim 10, wherein in step 61, when the received remote file control signal is a remote file read signal, a remote standby file read request data is configured to transmit a remote file generation read signal to a remote device and to wait for an execution result. Online data storage method of the ATM switch, characterized in that for setting. 11. The method of claim 10, wherein in step 61, when the received remote file control signal is a remote file write signal, a remote standby file write request data is configured to transmit a remote file generation write signal to the remote device and wait for a result of the reception. Online data storage method of the ATM switch, characterized in that for setting. 11. The method of claim 10, wherein in step 61, when the received remote file control signal is a remote file movement signal, a remote standby file movement request data is configured to transmit a remote file generation movement signal to a remote device and wait for a result of the reception. Online data storage method of the ATM switch, characterized in that for setting. 3. The ATM of claim 2, wherein the seventh step, if the received remote file control request signal is a remote file creation request signal, calls a file creation primitive, transmits a file creator message to the exchange, and enters a standby state. Online data storage method of exchange. 3. The method of claim 2, wherein the seventh step, if the received remote file control request signal is a remote file delete request signal, transmits a file deletion complete message to the exchange after entering a file deletion primitive, and enters a standby state. Online data storage method of ATM switch. 3. The ATM of claim 2, wherein the seventh step, if the received remote file control request signal is a remote file open request signal, calls a file open primitive, transmits a file indicator message to the exchange, and enters a standby state. Online data storage method of exchange. 3. The ATM of claim 2, wherein the seventh step, if the received remote file control request signal is a remote file close request signal, transmits a close completion message to the exchange after invoking a file close primitive and enters a standby state. Online data storage method of exchange. 3. The ATM of claim 2, wherein the seventh step transmits a data message read to the exchange after calling a file read primitive if the received remote file control request signal is a remote file read request signal, and enters a standby state. Online data storage method of exchange. 3. The ATM of claim 2, wherein the seventh step transmits a data message written after calling the file write primitive to the exchange if the received remote file control request signal is a remote file write request signal, and enters a standby state. Online data storage method of exchange. The method of claim 2, wherein the seventh step, if the received remote file control request signal is a remote file move request signal, transmits a file move pointer message to the exchange after calling a file move primitive, and enters a standby state. Online data storage method of ATM switch.