KR0175744B1 - Transmission and reception method for bandwidth variation of point to point leased line at atm switching system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Outgoing and called party processing method for changing bandwidth of point-to-point dedicated line in asynchronous delivery mode switching system.

2. The technical problem to be solved by the invention

In the small and medium ATM switching system, the operator needs to set up the leased line and change the bandwidth according to the desired service type so that the bandwidth of the point-to-point leased line in the VP / VC unit can be changed efficiently according to bidirectional symmetry / asymmetry and unidirectional. I want to.

3. Summary of Solution to Invention

When receiving the connection bandwidth change request, it checks the system status according to one-way and two-way service, changes the bandwidth on the subscriber / relay line matching module interface, requests the called party connection processing and receives the normal processing result from the called party. Changing the bandwidth, notifying the bandwidth change to the subscriber / relay line matching module, and notifying the operator of the change completion when the conversion of the subscriber / relay line matching module is successful.

4. Important uses of the invention

Used in ATM switching system.

Description

Outgoing and called party handling method for changing bandwidth of point-to-point dedicated line in asynchronous transfer mode switching system

The present invention relates to an outgoing and called party processing method for changing bandwidth of a point-to-point dedicated line in an Asynchronous Transfer Mode (ATM) switching system.

In order to speed up the implementation of broadband services and to quickly provide services to real users, many countries around the world are speeding up the development of ATM switching systems.

Currently, in the UK and Japan, ATM switching systems provide Virtual Path (VP) / Virtual Channel (VC) connection services, but the control method in these systems is fixedly fixed at the time of system installation. Since the service is provided by storing VP / VC connection information and routing information in the control memory of the system, there is a problem that flexible control is difficult, such as bandwidth cannot be changed for an already established connection.

The small ATM switching system in Korea, which is currently in the completion stage of development, provides a point-to-point leased line service in VP units, but it controls only bi-directional symmetry, so that even if one-way or bi-directional asymmetric service is required, it occupies the same band in both directions. As the utilization of the link resources is low, the subscriber capacity of the system is significantly lowered, and in the case of unidirectional control, the backward control also requires unnecessary time.

Therefore, the present invention requires the operator to set up a leased line while the system is used in a small and medium ATM switching system, and frequently change bandwidth according to a desired service type so that the bandwidth of the point-to-point leased line in the unit of VP / VC is bidirectional symmetrical / asymmetrical, unidirectional. Accordingly, an object of the present invention is to provide a processing method of an originating party and a called party for a bandwidth change that can be efficiently changed.

1 is a hardware diagram of a small and medium ATM switching system to which the present invention is applied.

2 is a software functional block diagram of a small and medium ATM switching system to which the present invention is applied.

3 is a flowchart of an originating main module for changing a bandwidth of a connection in a small and medium ATM switching system according to the present invention;

4A to 4C are flow diagrams of an outgoing connection for changing bandwidth of a connection in a small and medium ATM switching system according to the present invention.

5 is a flowchart of a called main module for changing a bandwidth of a connection in a small and medium ATM switching system according to the present invention;

6A and 6B are flowcharts of a called side connection processing for changing a bandwidth of a connection in a small and medium ATM switching system according to the present invention.

* Explanation of symbols for main parts of the drawings

1: ALS (ATM Local switching Subsystem)

2: ATM Central Switching Subsystem (ACS)

3: Access Switching Network Module (ASNM)

4: TIM (Trunk Interface Module)

5: Subscriber Interface Module

6: Access Switching Control Module (ASCM)

7: ISNM (Interconnection Switching Network Module)

8: Operation and Maintenance Control Module (OMCM)

In order to achieve the above object, the present invention provides a method for processing an originating side for changing a bandwidth of a point-to-point leased line applied to an asynchronous delivery mode switching system, and checks an input command and a system state when a connection bandwidth change request is received from an operator. Calculating a number of cells per second and a cell delay variation for monitoring a user cell by using a designated band value, and then changing a bandwidth on a subscriber / relay line matching module interface; After performing the first step, if the connection is already established and connected between different ATM local switching subsystems, the bandwidth on the internal switch link is changed, the called party connection processing is required, and the connection between the same ATM local switching subsystems (ALS); A second step of requesting a called party connection process immediately if the connection is not set as the reservation mode; After performing the second step, upon receiving the normal processing result from the called party, the bandwidth of the database is changed, the subscriber / relay line matching module is notified of the bandwidth change, and if the subscriber / relay line matching module is successfully converted, the operator is informed. A third step of notifying completion of the change; And a fourth step of storing an abnormal cause and recovering the information of the calling party and the called party if abnormally processed during the processing.

In addition, in the called party processing method for changing the bandwidth of a point-to-point dedicated line applied to an asynchronous delivery mode switching system, when a connection bandwidth change request is received from the calling party, information is stored in a register, the system state is checked, A first step of changing a bandwidth on a subscriber / relay line matching module interface link by calculating a number of cells per second and a cell delay variation for monitoring a user cell using the band value; After performing the first step, if the connection is already established and the connection is between different ALSs, after changing the bandwidth on the switch link, the connection information on the database is changed; otherwise, the connection is not established or between the same ALS. A second step of changing connection information on the database immediately if the connection is made; A third step of notifying the subscriber / relay line matching module of the bandwidth change after performing the second step, and notifying the calling party of the completion of the incoming call processing when the conversion of the subscriber / relay line matching module is successful; And a fourth step of storing an abnormal cause, notifying the called party of the processing abnormality to the calling party, and restoring connection related information of the called party if abnormal processing is performed during the processing.

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

1 is a hardware configuration diagram of a small and medium ATM switching system to which the present invention is applied, in which 1 is an ATM Local Switching Subsystem (ALS), and 2 is an ATM Central Switching Subsystem (ACS). ), 3 is an Access Switching Network Module (ASNM), 4 is a Trunk Interface Module (TIM), 5 is a Subscriber Interface Module (SIM), 6 is an Access Switching Control Module (ASNM). Access Switching Control Module (ASCM), 7 denotes an Interconnection Switching Network Module (ISNM), and 8 denotes an Operation and Maintenance Control Module (OMCM).

Small and medium ATM switching systems are distributed in units of independent ATM Local Switching Subsystem (ALS) 1 and interconnected by Central Switching Subsystem (ACS) 2.

Each ALS 1 includes an access switching network module (ASNM) 3 which performs link matching and ATM cell switching, and a relay line matching module (TIM) 4 which performs cell transmission and reception between a network and a node, and a subscriber. Subscriber registration module (SIM) 5 which performs cell transmission / reception function between networks, and call control module (ASCM) 6 which manages control and maintenance functions related to routing and connection processing in ALS (1). It consists of.

SIM (5) can be equipped with BSIH (9), a high speed (155 Mbps) transfer board, MSIH (10), a medium speed (44 Mbps) transfer board, and LSIH (11), a low speed (2 Mbps) transfer board. In (4), the HTIH 12 which is a 622 Mbps transfer board and the BTIH 13 which is a 155 Mbps transfer board may be mounted.

Each ACS (2) is an internal switching network module (ISNM) 7 used as an interconnector between the ASNMs (3) and maintenance functions within the ACS (2) and system-wide maintenance and management (MA). It consists of an Operation and Maintenance Control Module (OMCM) 8 that performs a function.

2 shows a software functional block diagram of a small and medium ATM switching system to which the present invention is applied.

The Execution Control Software Block (ECF) block 21 in the OMCM 8 that performs the operator interface analyzes the commands input by the operator and inter-process communication (IPC) messages corresponding to the input commands to the corresponding processor. A software block that processes operator input commands by sending.

The output control software block (OCF) block 22 is a software block that outputs an output message and a system output message for a command input by an operator to an operator terminal.

The semi-permanent point to point virtual connection control software block (SPVCF) block 23 in the ASCM 6 performing the point-to-point leased line control function is a call connection control processor (CCCP) in each ALS 1. Located in, create child processes for each of the messages received through the human machine interface (HMI), and each child process controls the connection to perform the function for that message. Depending on the scenario, it handles setting, changing, and releasing the point-to-point leased line.

The UNIR Link Resource Handling Software Block (ULRHF) block 24 is located within the Call Link Control Processor (CCCP) of each ALS 1 and manages User Network Interface (UNI) links and system internal links. It's a block.

An NNI Link Resource Handling Software Block (NLRHF) block 25 is located in a call link control processor (CCCP) of each ALS 1 and is a software block for managing a network node interface (NNI) link.

The Maintenance Software Block (MF) block 26 in the ASCM 6 is a software block that informs the SPVCF block 23 whether to use the UNI / NNI link corresponding to the dedicated line to be set.

The Subscriber Interface Module Control Software Block (SIMCF) block 27 in the Subscriber Interface Module (SIM) 5, which performs subscriber matching, is implemented with the firmware of the Subscriber Link Matching Module and routes subscriber information from the SPVCF block 23. Receives and manages the information for management, and by attaching routing information to find the routing path of the switch to the subscriber information cell to enable information transfer between the calling subscriber and the called subscriber.

The trunk interface module control software block (TIMCF) block 28 in the trunk line matching module (TIM) 4 performing the relay line matching function is mounted with firmware of the trunk line link matching module and routes the relay line information from the SPVCF block 23. Is a software function block for receiving and managing information for attaching routing information to a relay line information cell and attaching routing information for finding a routing path of a switch.

3 is a flowchart of an originating main process for changing the bandwidth of a point-to-point leased line in a small to medium ATM switching system according to the present invention, in which there is one main process per SPVCF block 23.

When the call connection control processor (CCCP) is executed, a main process is also generated to receive the bandwidth change message requested by the operator from the OMCM (301), and to handle the process of changing the connection bandwidth per message. The processes are created 302 one by one, and the main process terminates when the call connection control processor (CCCP) terminates.

4A to 4C illustrate an outgoing side processing flow diagram for changing the bandwidth of a point-to-point dedicated line in a small to medium ATM switching system according to the present invention.

The connection bandwidth change request message is received and the state of the input command received from the OMCM and the subscriber / relay line matching link is checked (401). It checks whether the connection specified here is already registered in the database (DB). If it is not registered in the database (DB), the reason for notifying the unregistered connection is stored and the failure of changing the leased line bandwidth is notified. When specifying the bandwidth to change, one-way and two-way are incompatible, so if the registered connection is one-way and the number of the specified bandwidth is two or the registered connection is two-way and the number of the specified bandwidth is one, save the cause of notifying the input variable error. Notifies failure of the leased line bandwidth change. When checking the link, receive (Rx) UNI / NNI link (subscriber / exchange node → SIM / TIM) for unidirectional, receive (Rx) link and transmit (Tx) UNI / NNI link (SIM / TIM → Contact MF block 26 to investigate the availability of the subscriber / switch node. If the link is in an unusable state, the cause of notifying that the link is unavailable is stored and a failure of the leased line bandwidth change is notified.

If the check result 402 is normal, a message informing the OMCM 8 to wait for the processing result is transmitted (403), and the number of cells per second and the cell delay variation for the user cell monitoring are calculated using the designated band value (404). .

In operation 405, a procedure of changing a bandwidth on a UNI / NNI link is performed. If the requested bandwidth is smaller than the bandwidth already set, only the ULRHF block 24 is notified, and if large, the following processing is performed. In the case of a unidirectional leased line, the ULRHF block 24 checks whether there is a free bandwidth for the required bandwidth value of the requested leased line in the Rx UNI / NNI link, and in the case of a bidirectional leased line, receives (Rx) / transmits. (Tx) Asks the ULRHF block 24 whether there is an acceptable margin for the required bandwidth value of the leased line requested in the UNI / NNI link. If a notification is given that there is no free bandwidth, the cause of the lack of required bandwidth is stored, and a failure of changing the leased line bandwidth is notified.

If the bandwidth change is successfully performed (406), it is examined whether the internal switch link should also be checked (407). That is, if the connection is a connection within the same ALS (1) or is in a non-established stage as a reservation mode, the destination side connection processing is requested (410), and the connection between the other ALS (1) is already established and occupies a switch link. If there is, it is checked if the bandwidth already occupied on the already occupied internal switch link can be changed to the designated bandwidth (408). In the case of unidirectional, only the transmit (Tx) switch link is checked in both directions, and in the case of bidirectional, both the transmit (Tx) and receive (Rx) switch links are checked, and if possible (409), the destination side connection processing is requested (410). If not, the switch link processing failure is notified (425), the calling party information is recovered (426), and the lease line bandwidth change failure is notified (427).

For a bandwidth change procedure at the called party, a connection process request message is sent to the called party main process (410), and a wait timer is registered (411) to enter the waiting state (412).

If the reception expiration timer is received in the call processing side waiting state (413), or if the reception processing result failure message is received (414, 415), the step 425 of notifying the incoming processing failure is performed.

When the reception processing result success message is received from the called party in the incoming processing waiting state 412 (414, 415), the bandwidth is changed on the calling party database DB (416).

If the change on the database fails (417), the step (425) of notifying the database change failure is performed. If the change is successful on the database, the UPC information is notified to the SIM / TIM. In operation 418, the standby timer is registered (419), and then the reception of the change result is waited (420).

Receiving the wait expiration timer in the standby state (421), or receiving a change failure message (422,423) to perform the steps of storing the cause of the change failure (425) or less, and if the change is made successfully (422,423) the change is completed to the operator In step 424, the process ends.

If the processing result is abnormal, the processing saves the abnormal cause (425), restores the information of the calling party (426), and notifies the failure of the leased line bandwidth change.

When the called party processing is completed (428), the called party information recovery request signal corresponding to the calling party failure is transmitted to the called party (429), after registering the waiting timer (430), and waiting for the called party recovery result (431). ).

When receiving the standby expiration timer in the standby state, the method performs the steps of transmitting the information recovery request signal back to the called party (429) or less, and receives a recovery failure message from the called party in the standby state (434,435), or sets two standby expiration timers. If received (433), a message notifying the data inconsistency between the call and the call (436), and terminates the process.

When the receiver receives the message recovery success message from the called party in the waiting state (434, 435), the process is terminated.

Fig. 5 shows a flowchart of the main process in the called party SPVCF block 23 for changing the bandwidth of the point-to-point leased line already registered or established in the system in the small and medium ATM switching system according to the present invention.

One main process in the SPVCF block 23 exists per SPVCF block 23, and a main process is also generated when the call connection control processor (CCCP) is executed to receive the bandwidth change request message from the originating SPVCF block 23. 501 creates one child process per message for the actual bandwidth change process (502) and terminates together when CCCP terminates.

6A and 6B show a processing flowchart of a called party process for changing the bandwidth of a pre-registered connection in a small and medium ATM switching system according to the present invention.

Data is stored in a register based on the bandwidth change request message received from the calling party, and it is checked whether the designated connection exists on the called party's database (601). In the case of unidirectional service, only the availability of the transmitting (Tx) UNI / NNI link (SIM / TIM → subscriber / switch node) on the called party is checked.In the case of bidirectional service, the transmitting (Tx) link and receiving (Rx) UNI Ask the MF block 26 for the availability of the / NNI link (subscriber / switch node → SIM / TIM).

If the connection does not exist or the link is not available in the database, a step 623 of storing the cause of the specified connection not being present or the UNI / NNI link not available is performed, and the call processing fails to the calling party. In step 624, the receiver terminates connection-related information recovery (625), and the process ends.

Upon successful processing, the system health check result 602 calculates the number of cells per second and cell delay variation for user cell monitoring using the specified band value (603), and at the specified bandwidth on the interface link with the subscriber / relay line matching module. Check if change is possible (604). If the requested bandwidth is smaller than the bandwidth already set, only the ULRHF block 24 is notified, and if large, the following processing is performed. In the case of a unidirectional leased line, the ULRHF block 24 checks whether there is a free bandwidth for the required bandwidth value of the requested leased line in the Tx UNI / NNI link, and in the case of a bidirectional leased line, receives (Rx) / transmits. (Tx) Asks the ULRHF block 24 whether there is an acceptable margin for the required bandwidth value of the leased line requested in the UNI / NNI link. If a notification is provided that there is no free band, step 623 is performed to store a cause for notifying the required band shortage.

If it is possible to change the bandwidth in step 604 (605), it is checked whether the specified connection is currently set or registered, but not yet set (606).

If the check result is not set in step 606, the value is changed to the designated bandwidth on the database (610), and if the change fails on the database (611), the step of storing the cause of the database change failure (623). And notify the originating party of the failure of the incoming processing (624), performing a recovery procedure for the bandwidth change in the ULRHF block 24 (625), and ends the process.

If it is determined in step 606 that the connection has already been established, it is checked whether it is a connection in the same ALS 1 (607). If the result of the test is a connection in the same ALS 1, the value is changed to the specified bandwidth on the database. Step 610 or less is performed, and if the result of the check is a connection between different ALS 1, it is checked if a bandwidth change on the switch link is possible (608). At this time, if only the receive (Rx) switch link in the unidirectional direction is checked in both the transmit (Tx) and receive (Rx) switch link in the bidirectional direction, and if the change is impossible (609), informing the switch link processing failure (623). If the change is successful (609), the value is changed to the specified bandwidth on the database (610).

If the change on the database fails (611), storing the cause of the database change failure (step 623), and if the change is successful (611), notifies the subscriber / relay line matching module of the bandwidth change (612). After the standby timer is registered (613), it enters the standby state (614).

As a result of the change, if a standby expiration timer is received in the standby state (615), or a signal indicating a failure notification is received from the matching module (616, 617), the cause may be that there is no response from the subscriber / relay line matching module or the failure of changing the subscriber / relay line matching module bandwidth. The storing step 623 is performed below.

Upon receiving the signal notifying the success of the bandwidth change from the matching module in the standby state as a result of the change (616, 617), the caller is notified of the completion of the call processing (618), and after registering the wait timer for recovery of the called party according to the call failure. 619, enters the standby state (620).

When receiving the recovery request signal from the calling party in the recovery request waiting state (622), the ULRHF block 24 performs a recovery procedure for the bandwidth change on the called party's database and the receiving subscriber / relay line matching module (625). When receiving the waiting timer in the waiting state (621), it means that the calling party has successfully performed, and thus the terminating party process ends.

The present invention described above is capable of various substitutions, modifications, and changes within the scope without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains, and thus is limited to the above-described embodiments and drawings. It is not.

The present invention made as described above has the following unique effects.

First, through the registration process to change the bandwidth of the point-to-point leased line in the small and medium ATM switching system, the subscriber frequently asks the operator to change the bandwidth of the already registered connection during the system operation, so that the subscriber desires such as voice / video / data transmission. You can freely change the service provided.

Second, this function can control all connections of already registered VP or VC unit, and control unidirectional control separately from the reverse bandwidth of 0 in both directions to prevent processing time and unnecessary abnormal state in the whole system. have. Therefore, resources can be used more efficiently to accommodate more subscribers.

Third, the unidirectional bandwidth change control method of the point-to-point dedicated line in the small and medium ATM switching system provides the basis for developing various network services including the point-to-multipoint service function in the high-speed ATM switching system in the future.

Fourthly, in the conventional small ATM switching system, the modularity of the program is improved by independing the function that was processed in one block to another block whether the bandwidth change on the subscriber matching module interface link is possible. In order to support the low and low speed service and the trunk line service between the subscriber matched with the / 44/2 Mbps subscriber link and the node matched with the 622/155 Mbps relay line link, the connection identifier may be assigned the ALS number, the IM number, the link number, and the VPI. In the case of the number and the dedicated line in the VC unit, the service is also provided for the medium and low speed subscriber (MSIM / LSIM) and the trunk line node (HTIM / BTIM) by configuring and processing the VCI number.

Claims (13)

An originating method for changing bandwidth of a point-to-point leased line applied to an asynchronous delivery mode switching system. Upon receiving a connection bandwidth change request from an operator, an input command and a system state are checked and a user cell is designated using a specified bandwidth value. After calculating the number of cells per second and cell delay variation for monitoring, and changing the bandwidth on the subscriber / relay line matching module interface (301,302, 401 to 406), after performing the first step, another ATM local switching subsystem Connection between the same ATM local switching subsystem (ALS) or the connection between the same ATM Local Switching Subsystem (ALS), or if the connection is not set as reserved mode After the required second steps 407 to 412, after performing the second step, normal processing from the called party A third step (413 to 424) of changing the bandwidth on the database upon receiving the request, notifying the subscriber / relay line matching module of the bandwidth change, and notifying the operator of the change completion when the subscriber / relay line matching module is successfully converted. And a fourth step (425 to 436) for storing an abnormal cause and recovering the information of the calling party and the called party if abnormally processed during processing. . The method of claim 1, wherein the first step comprises: a fifth step (301, 302) of generating a calling party process for connection bandwidth change processing when receiving a connection bandwidth change request from an operator; Performs a sixth step (401, 402) for checking the connection bandwidth change request command and the system state received from the operator, and if the check result is abnormal, the fourth step (425 to 436), and if the check result is normal, to the operation maintenance control module. A seventh step 403 for requesting result waiting, an eighth step 404 for calculating the number of cells per second and a cell delay variation for user cell monitoring using a designated band value after performing the seventh step, and the eighth step. After performing the step, the bandwidth of the point-to-point dedicated line comprising a ninth step (405,406) for changing the bandwidth on the subscriber / relay line matching module interface Originating method for change. The method of claim 2, wherein the sixth step (401, 402) checks whether the designated connection is already registered in the database, and if not registered in the database, the fourth step of storing the cause of notifying the unregistered connection. Performing; The fourth command for storing a cause of an error in an input variable when a command input from an operator is unidirectional in which a connection registered in a database is unidirectional and the number of specified bandwidths is two, or a registered connection is bidirectional and the number of specified bandwidths is one. Steps to perform the steps, when checking the link, receive (Rx) UNI / NNI link (subscriber / switch node → SIM / TIM) for unidirectional, receive (Rx) link and transmit (Tx) UNI / NNI for bidirectional And performing the fourth step of storing the cause of the link not being available if the link is unavailable as a result of the investigation, and the step of investigating the availability of the link (SIM / TIM → subscriber / switch node). An originating method for changing a bandwidth of a point-to-point leased line. 3. The method as claimed in claim 2, wherein the ninth step (405, 406) informs the link resource processing block (24) if the bandwidth required to be changed is less than the already set bandwidth. Determining whether or not a bidirectional leased line, in the case of a unidirectional leased line, whether there is a free bandwidth available for the requested bandwidth value of the requested leased line in the Rx user network interface (UNI) / network node interface (NNI) link. In the case of a bidirectional dedicated line, the link resource processing block checks whether there is an allowable bandwidth for the required bandwidth value of the requested leased line in the receive (Rx) / transmit (Tx) UNI / NNI link. If (24) is informed that the step of investigation and the free band is not found, the cause of the lack of required bandwidth is stored, and the change of the leased line bandwidth fails Inform the calling party processing method for changing the bandwidth of the point-to-point leased lines, characterized in that made in a step of performing the fourth step. The method of claim 1, wherein the second steps (407 to 412) are a fifth step of checking whether the connection is already established and a connection between different ATM local switching subsystems, and the connection between the other ATM local switching subsystems in the fifth step. A sixth step of investigating whether the bandwidth already occupied on the internal switch link already occupied if the connection is already established can be changed to the designated bandwidth; if the change is not possible in the sixth step, announcing the switch link processing failure and recovering the calling party information In the seventh step of performing the fourth step, if the change is possible in the sixth step, the called party connection process is requested, and for the bandwidth change procedure at the called party, a connection process request message is sent to the called party main process, and waiting. The eighth step of registering a timer and transitioning to the standby state and the same ATM local exchange in the fifth step. And a ninth step of performing the eighth step of requesting the called-side connection process immediately if the connection between the subsystems (ALS) or the connection is not set as the reservation mode. Originating method. 2. The method of claim 1, wherein the third steps 413 to 424 perform the fourth step of notifying the incoming call failure when receiving the wait expiration timer in the called party's processing wait state or receiving a failed message as a result of the incoming call processing. If the reception processing result success message is received from the called party in the waiting processing state, changing the bandwidth on the calling party database, and if the changing fails on the database, performing the fourth step notifying the failure of the database changing. If a successful change is made in the database, the SIM / TIM notifies the bandwidth change, registers a wait timer, waits for reception of the change result, and receives a wait-out timer in the standby state or receives a change failure message. Perform the fourth step of storing the cause of the change failure, and the change is made successfully. When the calling-party processing method for changing the bandwidth of the point-to-point leased lines, characterized in that made in a step for notifying the change completion to the operator. 4. The method of claim 1, wherein the fourth step (425 to 436) comprises: storing an abnormal cause, recovering information of the calling party, notifying failure of the leased line bandwidth, and determining whether the called party processing is completed. If the called party processing is not completed, terminates; if the called party processing is completed, transmitting the called party information recovery request signal according to the calling party failure to the called party, registering the wait timer, and waiting for the called party recovery result; When receiving the standby expiration timer in the standby state, it sends an information recovery request signal back to the called party, and when receiving the recovery failure message from the called party in the standby state, or receiving the standby expiration timer continuously, a message indicating the data inconsistency between the incoming and outgoing calls is sent. If the receiving party's data recovery success message is received from the called party in the notifying step and in the waiting state, Calling side processing method for changing the bandwidth of the point-to-point dedicated line comprising the step of terminating the switch. A called party processing method for changing the bandwidth of a point-to-point dedicated line applied to an asynchronous delivery mode switching system, wherein when a connection bandwidth change request is received from an originating party, information is stored in a register, the system state is checked, and a designated band value is obtained. The first steps (501, 502, 601 through 605) of changing the bandwidth on the subscriber / relay line matching module interface link by calculating the number of cells per second and cell delay variation for monitoring the user cell using the method, and after performing the first step, Is already established and if the connection is between different ALS, change the bandwidth on the switch link, and then change the connection information on the database. Otherwise, if it is an unconfigured connection or a connection between the same ALS, connect directly on the database. A second step (606 to 611) for changing the information, after performing the second step, to the subscriber / relay line matching module The third step (612 to 622) of notifying the bandwidth change and notifying the calling party of completion of the incoming call processing if the subscriber / relay line matching module is successfully converted, and if abnormally processed during the processing, the abnormal cause is stored and the called party is sent to the calling party. And a fourth step (623 to 625) for reporting side processing abnormality and recovering connection related information of the called party. 9. The method of claim 8, wherein the first step comprises: a fifth step (501, 502) of generating a called party process for connection bandwidth change processing when receiving a connection bandwidth change request from the calling party; The side process stores the data in a register based on the bandwidth change request message received from the calling party, and performs the sixth step (601, 602) of checking the state of the system, and if the check result is abnormal, performs the fourth step. Normally, after performing the seventh step 603 and the seventh step of calculating the number of cells per second and the cell delay variation for the user cell monitoring using the designated band value, and the eighth of changing the bandwidth on the subscriber / relay line matching module interface. And a called side processing method for changing the bandwidth of a point-to-point dedicated line, comprising steps (604, 605). 10. The method of claim 9, wherein the sixth step, the called party process stores data in a register based on a bandwidth change request message received from the calling party, and confirms whether a designated connection exists on the called party database. Performing the fourth step of notifying that the designated connection does not exist if the designated connection does not exist on the called party database, and if the designated connection exists on the called party database, checking whether it is a one-way service or a two-way service, For unidirectional service, only the availability of the sending (Tx) UNI / NNI link (SIM / TIM → subscriber / switch node) on the called party is checked.For bidirectional service, the send (Tx) link and receiving (Rx) UNI / Steps to verify the availability of the NNI link (subscriber / switch node → SIM / TIM) and UNI / NNI link unavailable if the link is unavailable The called party processing method for changing the bandwidth of the point-to-point leased lines, characterized in that made in a step of performing the fourth step of storing the source of. 10. The method of claim 9, wherein the eighth step comprises: checking whether a change can be made to a designated bandwidth on an interface link with a subscriber / relay line matching module; and if the requested bandwidth is smaller than a predetermined bandwidth, the link resource processing block 24 If the requested bandwidth is larger than the bandwidth already set, determine whether the service is a one-way service or a two-way service, and in the case of a one-way leased line, the requested bandwidth value of the requested leased line in the transmission (Tx) UNI / NNI link. It is determined through the link resource processing block 24 whether there is an available margin, and in the case of a bidirectional leased line, an allowable margin for the required bandwidth value of the leased line requested to be changed in the receive (Rx) / transmit (Tx) UNI / NNI link. The step of determining whether the band exists through the link resource processing block 24 and when the notification comes that there is no free band, And performing the fourth step of storing the cause of notifying the station shortage. The method as claimed in claim 8, wherein the second step comprises: checking whether the specified connection is currently established or registered, but not yet set; If the connection is already established, check whether the connection is within the same ALS. If the connection is within the same ALS, change the value to the bandwidth specified on the database. If it is a connection between different ALSs, checking whether the bandwidth change on the switch link is possible; if the check result cannot be changed, perform the fourth step of notifying the switch link processing failure; if the change is successful, the bandwidth designated on the database is performed. Changing the bandwidth of the point-to-point dedicated line characterized in that it comprises a step of changing the value to A called party processing method. The method of claim 8, wherein the third step comprises: notifying the subscriber / relay line matching module of the bandwidth change, registering the standby timer, and then switching to the standby state; receiving or matching the standby expiration timer in the standby state of the change; If the module is notified of the failure, performing the fourth step of storing the cause of no response from the subscriber / relay line matching module or the failure of the subscriber / relay line matching module bandwidth change, and notifying the success of the bandwidth change from the matching module in the waiting state of the change result. When the receiving party notifies the calling party of the completion of the incoming processing, registers a waiting timer for recovery of the called party according to the failure of the calling process, and then switches to the waiting state and receives the called party recovery request signal from the calling party in the waiting for recovery request. Link resource processing block 24, destination database, destination subscriber / relay line selection The recovery process for a bandwidth change on the module, and upon receipt of the delay timer in the standby state called party processing method for changing the bandwidth of the point-to-point leased lines, characterized in that comprising an end step of the destination process.