KR100450751B1 - Method for restarting ATM PVC connection in the open ATM switching system - Google Patents

Abstract

According to the present invention, an ATM permanent virtual connection (PVC) point-to-point connection and a point-to-multipoint connection are established by an operator or a telecommunications management network (TMN) agent in an open ATM switching system, and then the switching system or TMN agent. Is a method of restarting an ATM PVC connection that restores the connection settings when the connection setting information is lost due to a workstation down, where the ATM interface module (AIM) in the switching system goes down. The Switch Management Protocol (GSMP) Slave Connection Control Function (GSCCF) allows a reset with the connection information in the memory database, if the SMC goes down, the GSCCF in the SMC has the connection reset information and tells the AIM the ATM PVC point-to-point. And point-to-multipoint connections, and then setting up ATM PVC point-to-point and point-to-multipoint connections to the database on the SMC. When the workstation goes down, the TMN agent retrieves the database (MIB) with the point-to-point connection information and the point-to-multipoint connection information, which is retrieved from the database in the ATM call control unit (ACC). According to the present invention, even when the exchange system and the workstation are down, the connection information can be quickly restored to increase the safety and reliability of the exchange system.

Description

Method for restarting ATM PVC connection in the open ATM switching system

The present invention relates to a method for restarting an ATM PVC connection in an open ATM switching system, and more particularly, in an open ATM switching system, an ATM PVC point-to-point connection and a point-to-multipoint connection are operated by an operator or a remote user. After setting by the communication management network (TMN) agent, the present invention relates to an ATM PVC connection restart method for restoring the connection setting when the connection setting information is lost due to a workstation down which the switching system or the TMN agent is executed.

In the present specification, PVC is an abbreviation of permanent virtual connection, and the PVC connection includes a VP (Virtual Path) and a VC (Virtual Channel) connection. In this patent, PVC includes both VP and VC connections. In addition, there is a PVC and SVC connection method for connecting subscriber and system and system and system in ATM switching system. PVC is a permanent virtual connection where the operator gives a HMI command to make a connection, and SVC is a method that makes a connection by a signaling protocol.

In an open switching system, ATM PVC point-to-point connection or point-to-multipoint connection establishment is performed using HMI commands from the operator or TMN agent. When the point-to-point connection or the point-to-multipoint connection establishment command is successfully executed, the connection information is stored in the ACC and SMC databases of the switching system, and the connection information is also stored in the ATM interface module (AIM). However, in ATM call control unit (ACC), connection information is stored in database not only in memory but also in disk, while SMC is stored in database in memory and AIM is stored in table in memory. . In addition, the TMN agent stores the connection information in a kind of database called a MIB (Management Information Base), which is also stored only in memory. When the exchange system and the workstation where the connection information is stored are down in this way, the connection information stored in the database of the SMC, the connection information stored in the table of the AIM, and the connection information stored in the MIB of the TMN agent are lost. Therefore, there is a need for an ATM PVC connection restart method that restores ATM PVC point-to-point connection information and point-to-multipoint connection information when switching systems and workstations are down.

In the conventional ATM switching system, the ATM PVC point-to-point and point-to-multipoint connection and restart method consists of processing both the connection control processing part and the exchange control processing part in the ATM switching system. The production method of this ATM exchange system not only takes a long time to produce, but also the production method is very inefficient. In addition, no function was provided to initialize the MIB, which stores ATM PVC point-to-point and point-to-multipoint connection information performed by TMN agents.

The conventional ATM PVC connection restart method is composed of all processing in the ATM exchange system so that the shape of the ATM exchange system is changed or even other physical AMT exchange system shapes do not have the same physical shape. Reusability of the ATM PVC connection restart feature software has been reduced, requiring a new custom fit for each system. In addition, no function was provided to initialize the MIB, which stores ATM PVC point-to-point and point-to-multipoint connection information performed by TMN agents. In addition, the open ATM switching system provided only ATM PVC point-to-point and point-to-multipoint connectivity, but not the ATM PVC connection restart feature, which restores this ATM PVC point-to-point and point-to-multipoint connectivity information when the switching system or workstation is down. Did.

In addition, in the ATM switching system, Korea Patent 0204035 and Kim Eung-Ha et al. On "A method for establishing a connection between a reserved mode virtual path and a virtual channel in an asynchronous delivery mode switching system" possessed by the Korea Institute of Electronics and Telecommunications as a prior art for controlling an ATM PVC connection. There is a paper published in the "Next Generation Communication Software Conference" (pp. 55-58), "Analysis of ATM PVC Point-to-Point Connection Establishment Using Middleware in Open Multiservice Switching System" (December 2000). Both do not provide ATM PVC connection reset (restart).

Therefore, in order to solve the problem of the conventional fabrication method, the connection control processing part and the exchange control part are separated and constructed independently to manufacture an open ATM switching system implemented according to the open network control structure, and suitable for ATM PVC point-to-point and point A multipoint connection control method has been provided. However, ATM PVC point-to-point and point-to-multipoint connections created by performing HMI commands from the switching system or TMN agent that store the ATM PVC point-to-point and point-to-multipoint connection information generated by executing operator HMI (Human Machine Interface) commands It is pointed out that the ATM PVC connection information is lost when the workstation storing the MIB constituting the information goes down. Therefore, in order to increase the safety and reliability of the open ATM switching system, there is a need for a method for restarting the ATM PVC connection that quickly restores lost ATM PVC connection information to the switching system and the workstation.

Therefore, an object of the present invention is to provide an ATM PVC connection restart method for resetting and initializing an ATM PVC connection when the exchange system and the workstation are down, in order to increase the safety and reliability of the open ATM switching system.

1 is a structural diagram of an open ATM switching system to which the present invention is applied.

2 is a structural diagram showing the configuration and flow of messages between the relevant blocks for performing the ATM PVC connection restart method implemented on the open ATM switch according to the present invention.

3 is a structural diagram of a relation for performing the ATM PVC connection restart method according to the present invention.

Figures 4a to 4d is a general flow diagram for the ATM PVC connection restart method according to the present invention.

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

10 ... Workstation Module (WSM),

20.Main Processor Module (MPM),

30 ... ATM Interface Module (AIM),

40.Access Multiplex Module (AMM),

50.Media Gateway Module (MGM),

60 ... Switch Fabric Module (SFM).

Accordingly, in order to achieve the above object, the present invention provides a method for restarting ATM PVC connection in an open ATM switching system, when the switching system or the workstation has a failure such as system down.

ATM PVC connection resetting and ATM PVC connection initialization function for ATM PVC connection restart. In the present invention, when the switching system is down and the ATM PVC connection resetting request is made, the ATM PVC point-to-point and point-to-multipoint connection information is searched in the relation. To quickly reset ATM PVC point-to-point and point-to-multipoint connections to the switching system, and when the workstation goes down and requests ATM PVC connection initialization, ATM PVC point-to-point and point-to-multipoint connection information is quickly retrieved from the relations. ATM PVC point-to-point and point-to-multipoint connections are initialized in the MIB to increase the safety and reliability of the exchange system.

Also, the ATM PVC connection restart function software of the open ATM switching system to be implemented by using the middleware interface method is not dependent on the system, and the ATM PVC connection restart method is configured to increase the reusability.

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

1 is a structural diagram of an open ATM exchange system. The open ATM switching system includes a workstation module (WSM) 10, a main processor module (MPM) 20, an ATM interface module (AIM) 30, and access multiplex. AAM (Access Multiplex Module) 40, a Media Gateway Module (MGM) 50, and a Switch Fabric Module (SFM) 60.

The WSM 10 is composed of a human machine interface (HMI) subsystem (not shown) and a telecommunication management network (TMN) agent (TMN) 15, and between an operator and a middleware client. Operator matching function that provides the interface of the operator, the function of receiving the HMI commands input to the operator and the TMN agent 15 and calling the middleware server located in the processor constituting the MPM, and TMN ATM for restoring the MIB used by the TMN agent. Handles the PVC connection initialization request function.

The MPM 20 includes an ATM Call Controller (ACC) 22, an Switch Management Controller (SMC) 24, an Access Multiplex Controller (AMC) 26, and a Media Gateway Controller. (MGC; Media Gateway Controller) 28 A processor. The ACC 22 and the AMC 26 serve as middleware servers for processing ATM PVC point-to-multipoint connection functions, ATM PVC connection restart functions, and TMN ATM PVC connection initialization functions called from operator clients. Control ATM PVC point-to-point and point-to-multipoint connections in the exchange system body, perform ATM PVC connection restart and TMN ATM PVC connection initialization, and AMC 26 controls low-speed ATM PVC point-to-point and point-to-multipoint connection, low-speed ATM Perform a PVC connection restart and TMN low speed ATM PVC connection initialization. In addition, AMC 26 delivers ATM PVC point-to-point and point-to-multipoint connectivity information using GSMP protocol messages to manage UNI and NNI resources and to restore ATM PVC point-to-point and multipoint connectivity in SMC. It performs the function. The SMC 24 performs an operation and maintenance function, processes ATM PVC point-to-point and point-to-multipoint connection information delivered by a GSMP protocol message, and delivers the information to the AIM using an internal IPC.

The AIM 30-34 performs the fast and medium speed ATM subscriber matching function directly connected to the switching system body, and the AMM 40 is connected to the AIM 31 and performs the AM low speed ATM subscriber matching function. The MGM 50 is connected to the AIM 32 and performs a Circuit Emulation (CE) subscriber, an N-ISDN subscriber, and an AAL2 subscriber matching function.

The functions of the blocks required for the ATM PVC connection restart method are as follows.

The TMN agent 15 located in the WSM 10 calls the PPCCF block 221 to the middleware server for ATM PVC point-to-point connection initialization to initialize the MIB, and the PMCCF block 222 for ATM PVC point-to-multipoint connection initialization. Call the middleware server and initialize the MIB with the transferred ATM PVC point-to-point and point-to-multipoint connection information. The PPCCF block 221 located in the ACC 22 processor is a middleware server function that performs the required ATM PVC point-to-point connection reestablishment method from the GMPHF block 223 and the TMN ATM PVC point-to-point connection initialization required by the TMN agent 15. Performs a middleware server function that performs the function. The PMCCF block 222 located in the ACC 22 processor is the middleware server function performing the required ATM PVC point-to-multipoint connection reestablishment method from the GMPHF block 223 and the TMN ATM PVC point-to-multipoint required by the TMN agent 15. Performs a middleware server function that performs a connection initialization function. GMPHF 223 provides the functions required of PPCCF block 221 and PMCCF block 222 to reset ATM PVC point-to-point and point-to-multipoint connections, and PPCCF block 221 to reset ATM PVC point-to-point and point-to-multipoint connections. And the ATM PVC point-to-point and point-to-multipoint connection reestablishment information received from the PMCCF block 222 to the GSPHF block 241 using a GSMP protocol message. The GSPHF block 241 forwards the GSMP protocol message received from the GMPHF block 223 to the GSMP Slave Call Control Function (GSCCF) block 242, and the GSCCF block 242 receives the ATM PVC received from the GSPHF block 241. The point-to-point and point-to-multipoint connection reestablishment information is transmitted to the AIM 34 and the ATM PVC point-to-point and point-to-multipoint connection information is restored to a database in the SMC 24.

FIG. 2 is a diagram illustrating a configuration and message flow between related blocks for performing an ATM PVC connection restart method implemented on an open ATM switch system.

According to Fig. 2, the ATM PVC connection restart function is the PPCCF block 2211 and PMCCF block 2221 in the ACC1 (22-1) SMC (24) is down the ATM PVC connection reset request from the GMPHF block (2231) When the ATM PVC connection initialization request is received from the TMN agent 15. First, when the SMC 24 goes down, the GMPHF block 2231 calls the middleware procedure to the PPCCF block 2211 to request the ATM PVC point-to-point connection reset to reset the ATM PVC point-to-point connection. The PPCCF block 2211 detects only that it is outgoing in the persistent connection (R_SPC_INF) relation, that is, ORIG_FLAG is TRUE, and the connection type (CONN_TYPE) is not point-to-multipoint (PTMP) to ATMPH point-to-point to GMPHF block 2223. Pass connection reset information. GMPHF 2223 receiving ATM PVC point-to-point connection reset information forwards to GSPHF block 241 in SMC 24 using a GSMP protocol message, and GSPHF block 241 sends the received ATM PVC point-to-point connection reset information. It passes to the GSCCF block 242. GSCCF block 242 sends ATM PVC point-to-point connection reset information to AIMCF block 3401 in AIM1 34-1, causing AIMCF 3401 to substantially reset the ATM PVC point-to-point connection. The GSCCF block 242 restores the ATM PVC point-to-point connection information to the database 243 in the SMC 24 and outputs the result of the PPCCF block 2211 through the GSPHF block 241 and the GMPHF block 2231. To pass. The GMPHF block 2231 also calls the middleware procedure to the PMCCF block 2221 to request the ATM PVC point-to-multipoint connection reconfiguration to reset the ATM PVC point-to-multipoint connection. The PMCCF block 2221 searches for a root connection that is outgoing in the persistent connection (R_SPC_INF) relation, that is, ORIG_FLAG is TRUE and the connection type (CONN_TYPE) is point-to-multipoint (PTMP). GMPHF block (2231) finds leaf connections with the same MCN as the root connection in the unidirectional incoming (R_UDR_TERM_INF) relation located in the ACC processor with the MCN of the discovered route connection and associated with the route, that is, the leaf stored in LEAF_POR. ATM PVC point-to-multipoint connection reset information. GMPHF 2223 receiving ATM PVC point-to-multipoint connection reset information forwards to GSPHF block 241 using a GSMP protocol message, GSPHF block 241 sends the received ATM PVC point-to-multipoint connection reset information to the GSCCF block ( 242). GSCCF block 242 sends ATM PVC point-to-multipoint connection reestablishment information to AIMCF blocks 3401 and 340n, which causes AIMCF to substantially reset the ATM PVC point-to-multipoint connection. The GSCCF block 242 restores the ATM PVC point-to-multipoint connection information to a database in the SMC and transmits the result to the PMCCF block 2221 through the GSPHF block 241 and the GMPHF block 2231.

Next, when the workstation goes down, the TMN agent calls the middleware procedure to the PPCCF block 2211 to initiate the ATM PVC point-to-point connection initialization to the MIB to initiate the ATM PVC point-to-point connection. The PPCCF block 2211 is the originating state of the study connection (R_SPC_INF) relation, that is, the total number of ATM PVC point-to-point connections to be initialized by searching only for ORIG_FLAG is TRUE and the connection type (CONN_TYPE) is not point-to-multipoint (PTMP). After obtaining and passing the ATM PVC point-to-point connection information along with the ATM PVC point-to-point connection information, the TMN agent 15 has ATM PVC point-to-point connection information and reconfigures the ATM PVC point-to-point connection to the MIB. In addition, the TMN agent 15 calls the middleware procedure to the PMCCF block 2221 for the ATM PVC point-to-multipoint connection initialization to the MIB and requests the ATM PVC root connection initialization.

The PMCCF block 2221 searches only for the originating state in the persistent connection (R_SPC_INF) relation, that is, ORIG_FLAG is TRUE and the connection type (CONN_TYPE) is point-to-multipoint (PTMP). It can be initialized by searching for leaf connections with the same MCN as the root connection in the unidirectional incoming (R_UDR_TERM_INF) relation located in the ACC processor with the MCN of the discovered route connection and associated with the route, that is, the leaf stored in LEAF_POR. After obtaining the total number of ATM PVC point-to-multipoint connections and passing them to the TMN agent 15 along with the ATM PVC route connection information to be initialized, the TMN agent 15 has ATM PVC route connection information and reconfigures the ATM PVC route connection to the MIB. The PMCCF block 2221 then calls the middleware procedure with the MCN representing each route connection and requests ATM PVC leaf connection initialization.

The PMCCF block 2221 searches only for a connection type (CONN_TYPE) point-to-multipoint (PTMP) in the unidirectional incoming (R_UDR_TERM_INF) relation and the same as that required for the MCN. When the total number of ATM PVC leaf connections discovered and the ATM PVC leaf connection information to be initialized are passed to the TMN agent 15, the TMN agent 15 has the ATM PVC leaf connection information and reconfigures the ATM PVC leaf connections to the MIB. Allow many-to-many connections to be initialized.

3 is a structural diagram of a database for performing the ATM PVC connection restart method according to the present invention.

According to FIG. 3, the database for the ATM PVC connection restart method is composed of a permanent connection (R_SPC_INF) relation that stores point-to-point connection information and route connection information, and a one-way incoming (R_UDR_TERM_INF) relation that stores leaf connection information. Permanent connection (R_SPC_INF) relations include IN_LPORT as root-side logical port number, IN_VPI and IN_VCI as root-side VPI / VCI, OUT_LPORT as leaf-side logical port number, OUT_VPI and OUT_VCI as leaf-side VPI / VCI, VC, VP, Connection type to distinguish PTMP connection (CONN_TYPE), connection direction indicating FWD, BWD, BOTH direction as connection direction (CONN_DIR), FWD_COMB indicating forward traffic combination, FWD_PCR, FWD_SCR indicating forward PCR, SCR, MBS, CDVT, FWD_MBS BWD_PCR, BWD_SCR, BWD_MBS, BWD_CDVT, FWD_CDVT, Reverse PCR, SCR, MBS, and CDVT It consists of an MCN that indicates the association between a root connection and a leaf connection, and a LEAF_POR that indicates the location of the processor to which the leaf is connected.

One-way incoming (R_UDR_TERM_INF) relation is IN_LPORT (leaf side logical port number), IN_VPI, IN_VCI (leaf side VPI / VCI), OUT_LPORT (root side logical port number) OUT_VPI, OUT_VCI (root side VPI / VCI), VC, VP connection as connection type. CONN_TYPE for distinguishing the connection, CONN_DIR for the FWD, BWD and BOTH directions as the connection direction, BWD_COMB for the reverse traffic combination, BWD_PCR for the reverse PCR, SCR, MBS, and CDVT, BWD_SCR, BWD_MBS, BWD_CDVT, and the status of the connection. It consists of SHAP_ACT which indicates the activation and deactivation of SHAPER, and MCN which indicates the association between the root connection and the leaf connection.

4A-4D are overall flow diagrams of an ATM PVC connection restart method implemented on an open ATM switch. Hereinafter, the ATM PVC connection restart method will be described with reference to FIGS. 1 to 3.

According to FIG. 4A, first, when the SMC is down, the GMPHF block calls the middleware procedure to the PPCCF block to reset the ATM PVC point-to-point connection and requests the ATM PVC point-to-point connection reset (S1).

The PPCCF block that receives the request to reset the ATM PVC point-to-point connection (S2) is only outgoing on the persistent connection (R_SPC_INF) relation, ie only ORIG_FLAG is TRUE and the connection type (CONN_TYPE) is not point-to-multipoint (PTMP). (S3) The ATMPH point to point connection reset information is transmitted to the GMPHF block (S4). Receiving ATM PVC point-to-point connection reset information (S5), GMPHF transfers ATM PVC point-to-point connection reset information to the GSPHF block using a GSMP protocol message (S6). When the GSPHF block delivers the received ATM PVC point-to-point connection reset information to the GSCCF block (S8), the GSCCF block transmits the received ATM PVC point-to-point connection reset information to the AIMCF block (S10). Receiving the ATM PVC point-to-point connection reset information (S11), the AIMCF block substantially resets the ATM PVC point-to-point connection (S12) and delivers the result to the GSCCF block (S13). When the GSCCF block receives the execution result (S14), it restores the database with ATM PVC point-to-point connection information (S15), and then transfers the execution result to the GSPHF block (S16), and the GSPHF block receives the received result (S17). Deliver to block (S18). The GMPHF block forwards the received execution result (S19) to the PPCCF block (S20) and the PPCCF block completes the ATM PVC point-to-point connection reset by receiving the execution result from the GMPHF block (S21).

Then, according to Figure 4b, the GMPHF block calls the middleware procedure to the PMCCF block to reset the ATM PVC point-to-multipoint connection request for ATM PVC point-to-multipoint connection reset (S22).

Receiving an ATM PVC point-to-multipoint connection reset request (S23), the PMCCF block searches for a route connection that is outgoing from the persistent connection (R_SPC_INF) relation, that is, ORIG_FLAG is TRUE and connection type (CONN_TYPE) is point-to-multipoint (PTMP). (S24) Find the leaf connections with the same MCN as the root connection in the one-way incoming (R_UDR_TERM_INF) relation located in the ACC processor with the MCN of the discovered route connection and connected with the route, that is, the leaf stored in LEAF_POR (S25). ATM PVC point-to-multipoint connection reconfiguration information consisting of the connection information and leaf connection information is transmitted to the GMPHF block (S26). GMPHF block receiving ATM PVC point-to-multipoint connection reestablishment information (S26) transfers ATM PVC point-to-multipoint connection reestablishment information to GSPHF block using GSMP protocol message (S28). The GSPHF block transmits the received ATM PVC point-to-multipoint connection reset information to the GSCCF block (S30), and the GSCCF block transmits the received ATM PVC point-to-multipoint connection reset information to the AIMCF block (S32). . The AIMCF block receiving the ATM PVC point-to-multipoint connection reestablishment information (S33) substantially resets the ATM PVC point-to-multipoint connection (S34) and delivers the result of the execution to the GSCCF block (S35). When the GSCCF block receives the execution result (S36), it restores the database with ATM PVC point-to-multipoint connection information (S37), and then transfers the execution result to the GSPHF block (S38), and the GSPHF block receives the received result (S39). Transfer to GMPHF block (S40). The GMPHF block forwards the received execution result (S41) to the PMCCF block (S42) and the PMCCF block completes the ATM PVC point-to-multipoint connection resetting by receiving the execution result from the GMPHF block (S43).

4C, when the workstation is down, the TMN agent calls the middleware procedure to the PPCCF block to initialize the ATM PVC point-to-point connection to the MIB and requests ATM PVC point-to-point connection initialization (S44). The PPCCF block that receives the request to initiate the ATM PVC point-to-point connection (S45) is only outgoing on the persistent connection (R_SPC_INF) relation, ie ORIG_FLAG is TRUE and the connection type (CONN_TYPE) is not point-to-multipoint (PTMP). Obtain the number of all ATM PVC point-to-point connections to be initialized (S46) and store them in the total number information (S47) and transmit them to the TMN agent together with the ATM PVC point-to-point connection information to be initialized (S48). Receiving the ATM PVC point-to-point connection information to be initialized (S49), the TMN agent has ATM PVC point-to-point connection information and reconfigures the ATM PVC point-to-point connection to the MIB (S50). In addition, the TMN agent calls the middleware procedure to the PMCCF block to initialize the ATM PVC point-to-multipoint connection to the MIB and requests the ATM PVC root connection initialization (S51).

The PMCCF block that receives the ATM PVC route connection initialization request (S52) searches only for the originating state in the persistent connection (R_SPC_INF) relation, that is, ORIG_FLAG is TRUE and the connection type (CONN_TYPE) is point-to-multipoint (PTMP) (S53). ). Searching for leaf connections having the same MCN as the root connection in the one-way incoming (R_UDR_TERM_INF) relation located in the ACC processor with the MCN of the discovered route connection and connected with the route, that is, the leaf stored in LEAF_POR (S54). The number of all leaf connections connected to the root is obtained and stored in the leaf total number information (S55), and transmitted to the TMN agent together with the ATM PVC route connection information to be initialized (S56). Receiving the ATM PVC route connection information to be initialized (S57), the TMN agent has ATM PVC route connection information and reconfigures the ATM PVC route connection to the MIB (S58).

4D, the middleware procedure is called with the MCN representing the root connection to request the ATM PVC leaf connection initialization to the PMCCF blocks located in each ACC processor (S59).

The PMCCF block that receives the ATM PVC leaf connection initialization request (S60) searches only that the connection type (CONN_TYPE) is point-to-multipoint (PTMP) in the unidirectional incoming (R_UDR_TERM_INF) relation in the ACC processor and that the MCN is the same as required. (S61). The number of discovered ATM PVC leaf connections is obtained and stored in the leaf total number information connected to the root in the corresponding ACC processor (S62) and forwarded to the TMN agent together with the ATM PVC leaf connection information to be initialized (S63). Having received the ATM PVC leaf connection information to be initialized (S64), the TMN agent has ATM PVC leaf connection information and reconfigures the ATM PVC leaf connection to the MIB (S65).

The ATM PVC connection restart method of the present invention configured and operated as described above operates in an open ATM switch and has the following effects.

First, it provides an ATM PVC connection restart method to quickly restore lost ATM PVC connection information when the exchange system and workstation goes down.

Secondly, the middleware interface method can be used to make the software function not once dependent on the system, thereby increasing the reusability of ATM PVC connection restart software.

Claims (6)

In a method of restarting an ATM permanent virtual connection (PVC) connection in an open ATM switching system including a workstation module, a main processor module, and an ATM interface module having a database storing connection information, when the switching system is down, Reconstruct ATM PVC connections by restoring point-to-point or point-to-multipoint connection information in the main processor module, and reconfigure the database in the workstation module by restoring root and leaf connection information in the main processor module if the workstation goes down. By resetting the ATM PVC connection. 2. The permanent connection relation according to claim 1, wherein an ATM PVC point-to-point connection reset request is received from a switch management protocol (GSMP) master connection control function (GMPHF) block in an ATM call control unit in a main processor module when the switching system is down. Redirects ATM PVC point-to-point connection to ATM Interface Module (AIM) using GSMP protocol message and detects only outgoing state and connection type is not point-to-multipoint, and ATM PVC point to ATM management module in main processor module. A method of resetting an ATM PVC connection, comprising storing point connection information. The method according to claim 1, wherein when the switching system is down, an ATM PVC point-to-multipoint connection reset request is received from the GMPHF block to search for a route connection that is outgoing and connection type point-to-multipoint in a persistent connection relation, and then searched for a route. Finds an ATM call control (ACC) processor connected to the root of the ACC processor and finds a leaf connection with the same multicast channel number (MCN) as the root connection in the unidirectional incoming relation located in the ACC processor. A method of resetting an ATM PVC connection, comprising: resetting an ATM PVC point-to-multipoint connection at SMC and storing ATM PVC point-to-multipoint connection information at the SMC. 2. The system of claim 1, wherein when the workstation is down, it receives an ATM PVC point-to-point connection initialization request from a Telecommunications Network Management Network (TMN) agent in the workstation module and is outgoing from the persistent connection relation. A method for resetting ATM PVC connections, comprising: retrieving the total number of ATM PVC point-to-point connections and point-to-point connection information to be initialized by retrieving only the information and reconstructing them in the management information base (MIB). . The ATM PVC route connection of claim 1, wherein when the workstation is down, it receives an ATM PVC route connection request from a TMN agent and detects only the outgoing state of the persistent connection relation and the connection type is not point-to-multipoint. Delivering the total number and root connection information to the TMN agent to reconfigure in the MIB How to reset an ATM PVC connection. The ATM PVC leaf connection to be initialized by receiving an ATM PVC leaf connection initialization request from a TMN agent when the workstation is down and searching only in the one-way incoming relation that is identical to the MCN of the initialized root connection. And reconstructing the MIB by passing the total number and leaf connection information to the TMN agent.