KR20020090556A - System for concentration using virtual channel connection between asynchronous transfer mode network and other network and method thereof - Google Patents

Abstract

PURPOSE: A concentration system between an ATM network and other network is provided to connect an ATM network interfacing many subscribers and a PSTN network or other ATM network by using a virtual channel, thereby enabling concentration on the subscribers. CONSTITUTION: A routing table(315) stores routing information on cells inputted from many subscribers, and stores virtual channel connection information by a routing. An AVCC(Available Virtual Channel Connection) table(317) has information on available virtual channel connections among virtual channel connections connected with other network. A cell header translation logic(319) determines an entry position of the routing table(315), and assigns a routing table entry by using information on an available virtual channel connection entry when the determined routing table entry is not used, then routes the cells through the virtual channel connections. A CPU(311) senses a change of the AVCC table(317), and updates information on a virtual channel connection mapping for the other network and the virtual channel connections on the subscribers.

Description

System for Concentration between Asynchronous Transfer Mode Networks and Other Networks and Methods

The present invention relates to an aggregation system between an asynchronous transmission mode network and another network, and more particularly, to a system and method for aggregation using a virtual channel connection.

In general, in a switch network such as a Subscriber Line System, "CONCENTRATION" means that if one subscriber input does not always occupy an output to one network, but only occupies a certain period of time, Rather than mapping the outputs one-to-one, it is meant to allow multiple inputs to share one output. Statistically, the ratio of N inputs to which one output can be continuously shared is called N-to-1 aggregation, and a system having such an input-to-output ratio is called an N-to-1 aggregation system. The N inputs share the output, minimizing the hardware resource N / 1 for the output, resulting in the cost of configuration. In addition, if a separate output interface is provided in hardware for each of a plurality of subscribers, an increased system load is eliminated, and if the subscribers do not use the interfaces configured one-to-one for each subscriber. Eliminate the waste of resources generated.

However, since the aggregation concept as described above does not exist for the connection of an Asynchronous Transfer Mode (ATM) network, each of a plurality of subscribers must always support the connection in the asynchronous transfer mode network. do. That is, each of a plurality of subscribers must always maintain one-to-one connection in the asynchronous transmission mode network. Therefore, the system load is generated because the connection is always made even for the connection that does not use the current service, and the additional hardware equipment must be provided because the connection must be maintained for the connection that does not use the current service. As a result, there was a problem that hardware waste and price increase are caused. Thus, there is a need for an aggregation system for multiple subscribers in the asynchronous transmission mode network.

Accordingly, an object of the present invention is to provide a system and method for converging a plurality of subscribers using a virtual channel connection in an asynchronous transmission mode system.

Another object of the present invention is to provide a system and method for converging a plurality of subscribers through virtual channel connection mapping without additional hardware.

It is still another object of the present invention to provide a system and method for converging a plurality of subscribers using a virtual channel connection mapping capable of real time upgrade between a subscriber network and an asynchronous transmission mode device.

The system of the present invention for achieving the above objects; An aggregation system using a virtual channel connection between an asynchronous transmission mode network that matches a plurality of subscribers and another network, comprising: a routing table for storing routing information about cells input from the subscribers and virtual channel connection information according to the routing; A useful virtual channel connection table having information on the useful virtual channel connection among the virtual channel connections connected to the other network, and determining a routing table entry position according to the cell input detection, and the determined routing table entry is not in use A cell header translation unit for routing the cell through the corresponding virtual channel connection by allocating a routing table entry using the useful virtual channel connection entry information on the useful virtual channel connection table, and detecting a change in the useful virtual channel connection table. , Side And a controller for updating the information on the virtual channel connection to the subscribers and the virtual channel connection mapping to the other network according to the detection of the call.

The method of the present invention for achieving the above objects; Asynchronous transmission mode One end is connected to the subscriber network, the other end is connected to the other network, the routing table for storing information about the virtual channel connection with the subscriber network, and the current of the virtual channel connection with the other network A aggregation method using a virtual channel connection between an asynchronous transmission mode network and another network having a useful virtual channel connection table for storing information about a useful virtual channel connection that is not in use, the routing table entry location is determined when a cell input is detected. Determining, if the determined routing table entry is not in use, retrieving the useful virtual channel association table and allocating a useful virtual channel association table entry having virtual channel information to route the input cell; Virtual channel table Updating the routing table entry with the virtual channel information of the entry. Updating the useful virtual channel connection table entry after updating the routing table entry; and routing the cell through a virtual channel connection corresponding to the updated routing table entry after updating the useful virtual channel connection table entry. Characterized in that the process made to control as possible.

1 shows a schematic configuration of a network for performing functions in an embodiment of the present invention.

2 is a block diagram illustrating an internal configuration of an asynchronous transmission mode subscriber equipment according to an embodiment of the present invention.

3 is a block diagram illustrating an internal configuration of a virtual channel connection mapping unit of FIG. 2.

4 illustrates a structure of a useful virtual channel connection table entry according to an embodiment of the present invention.

5 illustrates a routing table entry structure according to an embodiment of the present invention.

6 is a flowchart illustrating a setup operation of the control unit 311 according to an embodiment of the present invention.

7 is a flowchart illustrating a virtual channel connection mapping process according to an embodiment of the present invention.

8 is a flowchart illustrating a process of updating a subscriber virtual channel connection / useful virtual channel connection mapping table by the controller 311 according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

1 is a diagram illustrating a schematic configuration of a network that performs a function in an embodiment of the present invention.

As shown in FIG. 1, a plurality of subscribers, for example, a desktop personal computer (111), a laptop (laptop) personal computer 113, and a telephone 115 and a plurality of subscribers, such as a fax 117, are connected to the network side, i.e., the asynchronous transfer mode (ATM) network side, the subscriber network of the asynchronous transfer mode network, i.e. Asynchronous transfer mode subscriber network 119 is connected. The asynchronous transmission mode subscriber network 119 accepts connections of the subscribers and supports a predetermined number, for example, X virtual channel connections (VCCs). The asynchronous transfer mode subscriber network 119 is connected to the asynchronous transfer mode subscriber equipment 121 using the X virtual channel connections. The asynchronous transmission mode equipment 121 is connected to the asynchronous transmission mode subscriber network 119 and connected to the subscriber through the X virtual channel connections. The asynchronous transmission mode subscriber equipment 121 is then connected with other networks through Y virtual channel connections. Here, the other network means, for example, a Public Switching Telephone Network (PSTN) or another asynchronous transmission mode network, and is not directly connected to the asynchronous transmission mode subscriber network 119 to which the plurality of subscribers are subscribed. Means not a network. Here, the number of virtual channel connections X supported by the asynchronous transmission mode subscriber network 119 and the number of virtual channel connections Y supported by the asynchronous transmission mode subscriber equipment 121 are The relationship is established.

In this way, since the number of subscriber interfaces provided by the asynchronous transmission mode subscriber network 119, that is, the number of virtual channel connections exceeds the number of virtual channel connections provided by the asynchronous transmission mode subscriber equipment 121, the asynchronous transmission mode subscriber equipment. 121 maps the virtual channel connection of the asynchronous transmission mode subscriber equipment 121 itself, which is a limited network side interface, with the virtual channel connection of the asynchronous transmission mode subscriber network 119. Here, since the mapping relationship for mapping the virtual channel connection X which is the plurality of subscriber side interfaces and the virtual channel connection Y which is the limited number of network side interfaces will be described with reference to FIG. 2, the description thereof will be omitted.

Therefore, the asynchronous transmission mode subscriber equipment 121 has a virtual channel connection number Y that can be provided by the asynchronous transmission mode subscriber equipment 121 itself is less than the virtual channel connection number X provided by the asynchronous transmission mode subscriber network 119. Therefore, virtual channel connection mapping is performed for aggregation. The virtual channel connection mapping is performed with a mapping table entry, and a generation time and a destruction time of the virtual channel connection mapping table entry are as follows.

First, the generation time of the virtual channel connection mapping table entry is a subscriber side connection request time and another network side connection request time. Second, the destruction time of the virtual channel connection mapping table entry is a subscriber side release request time and another network. Side release request time. Here, since the detection algorithm of the asynchronous transmission mode subscriber equipment 121 for the generation time and the destruction time of the mapping table entry for the virtual channel connection mapping will be described with reference to FIG. 6, the description thereof will be omitted. .

Thus, if the asynchronous transfer mode subscriber equipment 121 maps between the virtual channel connection of the asynchronous transfer mode subscriber network 119 and the virtual channel connection between the asynchronous transfer mode subscriber equipment 121, that is, the asynchronous transfer mode subscriber. When the virtual channel connection X of the network 119 and the virtual channel connection Y between the asynchronous transmission mode subscriber equipment 121 is mapped, the other network, for example, a public telephone telephone (PSTN) through the mapped virtual channel connection, is mapped. Network) or another asynchronous transfer mode network.

Then, the internal configuration of the asynchronous transmission mode subscriber equipment 121 described above will be described with reference to FIG.

2 is a block diagram illustrating an internal configuration of an asynchronous transmission mode subscriber equipment according to an embodiment of the present invention.

First, as shown in FIG. 2, the asynchronous transmission mode subscriber equipment 121 is connected to the asynchronous transmission mode subscriber network 119 by a virtual channel, and a virtual channel connection mapping unit 121 which maps a virtual channel connection with another network side. And an asynchronous transmission mode chip 213 connected to the virtual channel connection mapping unit 211 to perform an asynchronous transmission mode function operation.

As described above with reference to FIG. 1, if there are X virtual channel connections on the subscriber side, that is, on the asynchronous transmission mode subscriber network 119 side, the virtual channel connection mapping unit 211 is provided by the asynchronous transmission mode subscriber equipment 121. Since the number of virtual channel connections that may be Y is smaller than the X, virtual channel connections are mapped. When the mapped virtual channel connections, that is, the virtual channel connection X of the asynchronous transmission mode subscriber network 119 is mapped to the virtual channel connection Y of the asynchronous transmission mode subscriber equipment 121, the mapped virtual channel connection Y is asynchronous. Asynchronous transmission mode chip 213 performing the transmission mode function is connected. Then, the asynchronous transmission mode chip 213 transmits the corresponding data on the other network with the mapped Y virtual channel connections.

The detailed configuration of the virtual channel connection mapping unit 211 described above is illustrated in FIG. 3.

FIG. 3 is a block diagram illustrating an internal configuration of a virtual channel connection mapping unit of FIG. 2.

The virtual channel connection mapping unit 211 may include a central processing unit (CPU) 311, a dual port random access memory (DPRAM) 313, and a cell header translation logic 319. )Wow, Content Addressable Memory (CAM) 321 for shortening the memory access time to increase the data retrieval speed, and a Framer 323. The memory 313 includes a Routing Table. 315 and an Available Virtual Channel Connection (AVCC) table 317 are stored.

The controller 311 generally controls the virtual channel connection operation of the virtual channel connection mapping unit 211. That is, the controller 311 controls the virtual channel connection operation as a whole by referring to the routing table 315 and the useful virtual channel connection table 317 stored in the memory 313. 315) Whenever an entry and a useful virtual channel connection table 317 entry are updated, the updated content is detected according to a predetermined signal, and the subscriber virtual channel connection / useful virtual channel connection is reflected by reflecting the detected update content. Update the mapping table. Here, the subscriber virtual channel connection / utility virtual channel connection mapping table provided by the control unit 311 is information on each of the X virtual channel connections provided by the asynchronous transmission mode subscriber network 119 and is currently in use. Information about virtual channel connections and useful virtual channel connections is stored. The controller 311 has a list of the useful virtual channel connections and refers to the virtual channel connection mapping.

The routing table 315 stores all the provisioned provisions in the current state, and the maximum number of entries that can be stored in the routing table 315 is X. Further, the useful virtual channel connection table 317 stores useful virtual channel connection entries for real time registration of the routing table 315, and the maximum number of the useful virtual channel connection entries is Y. Herein, the useful virtual channel connection means an available virtual channel connection that is not currently being used, that is, available to use.

The framer 323 inputs an asynchronous transmission mode cell of a physical layer input to the asynchronous transmission mode subscriber equipment 121, and also generates an asynchronous transmission occurring in the asynchronous transmission mode subscriber equipment 121. The transmission mode cell is transmitted to the outside. The asynchronous transmission mode chip 213 sets and manages a predetermined number, for example, N useful virtual channel connections. The cell header translator 319 analyzes the header of the asynchronous transmission mode cell output from the framer 323, and determines the routing table entry position of the input asynchronous transmission mode cell according to the analyzed header information. And assigning the determined routing table entry to a useful virtual channel connection to control the input asynchronous transmission mode cell to be routed. The cell header translator 319 updates the changed routing table entry information and the useful virtual channel connection table entry information corresponding to the asynchronous transmission mode cell input. An interrupt for the update is generated and provided to the controller 311. Then, the controller 311 updates the corresponding information according to the interrupt.

Next, the useful virtual channel connection table 317 entry structure and the routing table 315 entry structure will be described with reference to FIGS. 4 and 5, respectively.

4 is a diagram illustrating a useful virtual channel connection table entry structure according to an embodiment of the present invention.

In the useful virtual channel connection table 317, the useful virtual channel connection table entry may be generated as many as the number of virtual channel connections provided by the maximum asynchronous transmission mode equipment 121, that is, Y. A plurality of useful virtual channel connection table entries as shown in FIG. 4 are stored in the useful virtual channel connection table 317.

Available flag 411 is a flag indicating that a currently available virtual channel table entry is available, i.e. not in use, and an updated flag 413 is currently available. This flag indicates that it is currently updated. The Virtual Path Identifier (VPI) 415 indicates a virtual path number to be routed to any cell input when an arbitrary cell is input from the asynchronous transmission mode subscriber network 119, and also a virtual channel. VCI (Virtual Channel Identifier) 417 indicates the virtual channel number to route to for any of the cells. Therefore, in the entry structure on the useful virtual channel connection table 317, the virtual path identifier 415 and virtual channel identifier 417 store an output virtual path identifier and an output virtual channel identifier to which any cell is to be routed in an initial state. have. Then, when used as an entry for routing in the routing process for the cell input to the asynchronous transmission mode equipment 121, the output virtual path identifier and output virtual channel identifier are switched to the input virtual path identifier and input virtual channel identifier state. Since this will be described below, a detailed description will be omitted.

5 is a diagram illustrating a routing table entry structure according to an embodiment of the present invention.

In the routing table 315, the routing table entries may be generated as many as X virtual channel connections provided by the maximum asynchronous transmission mode subscriber network 119. The routing table 315 stores a plurality of routing table entries as shown in FIG. 5.

The output board ID 511 represents an ID of a board to which an input cell is routed and output, and an output chip ID 513 represents an ID of a chip to which the input cell is routed and output. . A valid (V) flag 515 indicates that the current routing table entry is valid, and an in-use flag 517 indicates that the current routing table entry is in use. And reserved areas 519 and 521 are idle fields reserved for any data, and an output virtual path identifier (Output VPI) 523 indicates a virtual path number to which the input cell is to be routed. A virtual channel identifier (Output VCI) 525 indicates the virtual channel number to which the input cell will be routed. Here, if the output virtual path identifier 523 and the output virtual channel identifier 525 are assigned a useful useful virtual channel association table entry on the useful virtual channel association table 317 to an input cell, the allocated useful virtual channel identifier is assigned. Converted to a virtual path number and a virtual channel number stored in the virtual path identifier and the virtual channel identifier on the channel association table entry. Thus, the input cell is routed through the useful virtual path and virtual channel. A cell counter 527 counts cells input and output to the asynchronous transmission mode subscriber equipment 121 to perform overall cell counting such as traffic occupancy and system capacity of the user.

6 is a flowchart illustrating a setup operation of the controller 311 according to an embodiment of the present invention.

First, when the virtual channel connection mapping unit 211 of the asynchronous transmission mode subscriber equipment 121 starts to operate, the control unit 311 of the virtual channel connection mapping unit 211 initializes the routing table 315 (Initialize Routing Table). In operation 611, the initialized routing table is set up.

Here, the process of setting up the routing table consists of the following three steps.

The first step is to unset the valid bit of the valid flag 515 of the routing table 315 entries. The reason why the valid bit of the valid flag of the routing table entry is not set is to indicate that the corresponding routing table entry is not currently set in the routing.

The second step is to unset the in-use bit of the in-use flag 517 of the routing table 315 entry. Here, the reason why the busy bit of the busy flag of the routing table entry is not set is to indicate that the routing table entry is not assigned to the current routing.

The third step is to set the output virtual path identifier 523 and the output virtual channel identifier 525 of the routing table 315 entry to empty with no data written (leave output VPI, VCI empty). Here, the output virtual path identifier and the output virtual channel identifier are in a state in which no data is written, that is, the output virtual path number and the output virtual channel number are not written because no cell is currently routed.

When the setup for the routing table consisting of the three steps is completed, the controller 311 adds the useful virtual channel connection entry on the useful virtual channel table 317 and terminates (613). Here, adding the useful virtual channel connection entry means adding an entry for an unused virtual channel connection supported by the asynchronous transmission mode equipment 121 to the entry of the useful virtual channel table 317. do.

When the asynchronous transmission mode cell is received from the actual subscriber side, that is, the asynchronous transmission mode subscriber network 119 in the standby state after the setup operation of the control unit 311 is finished, the cell of the asynchronous transmission mode subscriber equipment 121 is received. The header translator 319 performs an operation for performing virtual channel connection mapping for the received asynchronous transmission mode cell, and the virtual channel connection mapping process of the cell header translator 319 will be described with reference to FIG. 7. Let's do it.

7 is a flowchart illustrating a virtual channel connection mapping process according to an embodiment of the present invention. In particular, FIG. 7 is a flowchart illustrating a virtual channel mapping process when a subscriber attempts to make a call.

First, when a call is detected from the asynchronous transmission mode subscriber network 119 on the subscriber side to the asynchronous transmission mode subscriber equipment 121, that is, when an asynchronous transmission mode cell is received (step 711), the asynchronous transmission mode subscriber equipment 121 The cell header translation unit 311 determines the routing table entry position with reference to the CAM 321 (step 713). After determining the routing table entry location, the cell header translation unit 311 checks whether the determined routing table entry location is valid by comparing the determined routing table entry location with the stored routing table 315 (step 715). ). Here, checking whether the routing table entry is valid is checking whether the valid flag 515 of the routing table entry indicates a valid state, as shown in FIG.

As such, when the determined routing table entry position is valid, the cell header translator 319 checks whether the determined routing table entry is in use (step 717). Here, checking whether the determined routing table entry is in use checks the busy flag 517 in the corresponding routing table entry of the routing table 315 to show if the corresponding routing table entry is in use. Means to inspect. If the determined routing table entry is not in use as a result of the check, the cell header translator 319 checks whether the received asynchronous transmission mode cell is requested (step 719).

When the received asynchronous transmission mode cell is requested, the cell header translator 319 searches for the stored useful virtual channel connection table 317 and searches for a useful and not updated virtual channel connection table entry. Search (step 721). Here, the reason for retrieving the virtual channel connection table entry that is not in the useful and currently updated state is to establish a useful virtual channel connection to route the asynchronous transmission mode cell received in the asynchronous transmission mode subscriber network 119. The cell header translator 319 retrieving this useful virtual channel association table entry updates the corresponding routing table entry of the routing table 315 (step 723).

The process of updating the corresponding routing table entry of the routing table 315 is as follows.

First, the cell header translator 319 may include a virtual path number written in the virtual path identifier 415 and the virtual channel identifier 417 of the searched useful and not updated useful virtual channel connection table entry. The virtual channel number is input to the output virtual path identifier 523 and the output virtual channel identifier 525 of the corresponding routing table entry. Secondly, the busy bit of the busy flag 517 of the corresponding routing table entry is set to indicate that the routing table entry is busy.

In this manner, when the routing table entry is updated, the cell header translator 319 updates the corresponding useful virtual channel connection table entry (step 725).

Herein, the process of updating the corresponding useful virtual channel connection table entry of the useful virtual channel connection table 317 is as follows.

First, the cell header translator 319 inputs an input virtual path identifier and an input virtual channel to the virtual path identifier 415 and the virtual channel identifier 417 of the corresponding useful virtual channel connection table entry mapped with the routing table entry. Enter an identifier. Secondly, an update bit of the update flag 413 of the corresponding useful virtual channel link table entry is set to indicate that the corresponding useful virtual channel link table entry is currently in an updated state.

When the update of the useful virtual channel connection table entry is performed, the cell header translator 319 generates an interrupt to indicate that the useful virtual channel connection table 317 has been updated, and thus the controller 311. Output to step 727. After generating the interrupt to the control unit 311, the cell header translator 319 performs the asynchronous transmission mode subscriber network according to the virtual channel connection mapping according to the update of the routing table 315 and the useful virtual channel connection table 317. The asynchronous transmission mode cell received from 119 is routed to another network, that is, the asynchronous transmission mode network (step 729). Here, when the other network is a general circuit network, for example, a circuit network such as a public telephone network, not the asynchronous transmission mode network, the virtual channel connection is determined as a channel and is routed.

On the other hand, if the determined routing table entry is not valid, the cell header translator 319 discards the asynchronous transmission mode cell received from the asynchronous transmission mode subscriber network 119 because the determined routing table entry is not valid. (discard) (Step 731). Similarly, even if the received asynchronous transmission mode cell is not requested, the cell header translator 319 discards the received asynchronous transmission mode cell (step 731) and ends.

After the cell header translation unit 319 finishes updating the routing table entry and the useful virtual channel connection table entry, an interrupt is generated to the control unit 311 so that the control unit 311 can determine the useful virtual channel connection. When the update is recognized, the controller 311 updates the subscriber virtual channel connection / use virtual channel connection mapping table that it has. This process will be described with reference to FIG. 8.

8 is a flowchart illustrating a process of updating a subscriber virtual channel connection / utility virtual channel connection mapping table by the controller 311 according to an embodiment of the present invention.

As described with reference to FIG. 7, the cell header translator 319 generates an interrupt generated according to the update of the routing table 315 and the useful virtual channel table 317, and when the generated interrupt is received by the controller 311. The controller 311 searches the useful virtual channel connection table 317 to retrieve the updated useful virtual channel connection table entry (step 813). Here, the process of searching for the updated useful virtual channel connection table entry is as follows.

First, the update flag 413 of each of the plurality of useful virtual channel connection table entries stored in the useful virtual channel connection table 317 is checked. Secondly, if the checked update flag 413 has an update bit set to indicate that the corresponding useful virtual channel connection table entry is currently in an updated state, the useful virtual channel connection table entry is updated with the updated useful virtual channel connection table entry. Decide on

In this way, the controller 311 which retrieves the updated useful virtual channel connection table entry updates the subscriber virtual channel connection / useful virtual channel connection mapping table included in the controller 311 according to the update information (815). step). That is, since the corresponding useful virtual channel connection table entry in the updated state among the useful virtual channel connections supported by the asynchronous transmission mode equipment 121 transitions to the state involved in asynchronous transmission mode cell routing, the corresponding useful virtual channel connection table Update the entry to use. The controller 311 updates the useful virtual channel connection table 317 after updating the subscriber virtual channel connection / use virtual channel connection mapping table (step 817). Here, the process of updating the useful virtual channel connection table 317 is as follows.

First, input the virtual path number and the virtual channel number in the output virtual path identifier 523 and the output virtual channel identifier 525 of the corresponding useful virtual channel connection table entry on the useful virtual channel connection table 317 ( write).

Second, the update bit of the update flag 517 of the corresponding useful virtual channel link table entry is unset. Here, the reason why the update bit of the update flag 517 of the useful virtual channel connection entry is not set is because the controller 311 has confirmed the contents updated by the cell header translator 319. This is to remove the case of checking the update status again.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

The present invention as described above enables aggregation of multiple subscribers using a virtual channel connection between an asynchronous transfer mode network that matches multiple subscribers and another network, such as a public telephone network or another asynchronous transfer mode network. Has the advantage.

By enabling virtual channel connection in the asynchronous transmission mode network, multiple subscribers can share a limited output, thus minimizing hardware resources. In addition, each of the plurality of subscribers eliminates the load of the switch network, which is increased when the hardware has a separate output interface. And it has the advantage of eliminating the waste of resources, such as when the subscriber is not using the corresponding interface configured one-to-one for each subscriber.

Claims (16)

In an aggregation system using a virtual channel connection between an asynchronous transmission mode network that matches multiple subscribers and another network, A routing table for storing routing information on cells input from the subscribers and virtual channel connection information according to the routing; A useful virtual channel connection table having information on the useful virtual channel connection among the virtual channel connections connected to the other network; The routing table entry position is determined according to the cell input detection, and if the determined routing table entry is not in use, the routing table entry is allocated by using the useful virtual channel connection entry information on the useful virtual channel connection table. A cell header translator for routing the cell through; And a control unit for detecting a change in the useful virtual channel connection table and updating information about the virtual channel connection for the subscribers and the virtual channel connection mapping for the other network according to the change detection. . The method of claim 1, The routing table stores virtual channel connection routing information for the input cell, the routing table entry includes a valid flag indicating whether the entry is valid, a busy flag indicating whether the entry is currently in use, and the input. And a virtual path identifier indicating a virtual path number to which the outputted cell is to be outputted, and a virtual channel identifier indicating a virtual channel number to be outputted by the inputted cell. The method of claim 1, The useful virtual channel association table stores routing information for output virtual channel associations for any cell input, and the useful virtual channel association table entry is a useful flag indicating whether the corresponding useful virtual channel association table entry is useful. An update flag indicating whether the corresponding useful virtual channel connection table entry is in an updated state, a virtual path identifier indicating a virtual path number on which the arbitrary cell is to be output, and a virtual indicating a virtual channel number on which the arbitrary cell is to be output; And a consolidation system comprising a channel identifier. The method of claim 1, And the cell header translator generates an interrupt indicating that routing table and useful virtual channel connection table entry information has been updated for routing to the cell. In a system that aggregates using a virtual channel connection between an asynchronous transmission mode network and another network, An asynchronous transmission mode subscriber network that matches a plurality of subscribers and supports a first number of virtual channel connections; One end is connected to the subscriber network, the other end is connected to the other network supporting a second number of virtual channel connections, routing information for the virtual channel connection to the subscriber network, and a virtual channel for the other network. A consolidation system comprising asynchronous transmission mode subscriber equipment for real-time updating of information on a useful virtual channel connection that is not currently in use during the connection, and for routing a cell input from the subscriber network using the useful virtual channel connection. . The method of claim 5, The asynchronous transmission mode subscriber equipment; A routing table for storing routing information on cells input from the subscriber network and virtual channel connection information according to the routing; A useful virtual channel connection table having information on the useful virtual channel connection among the virtual channel connections connected to the other network; The routing table entry position is determined according to the cell input detection, and if the determined routing table entry is not in use, the routing table entry is allocated by using the useful virtual channel connection entry information on the useful virtual channel connection table. A cell header translator for routing the cell through; And a control unit for detecting a change in the useful virtual channel connection table and updating information on the virtual channel connection to the subscriber network and the virtual channel connection mapping to the other network according to the change detection. . One end is connected to a subscriber network supporting a first number of virtual channel connections, the other end is connected to another network supporting a second number of virtual channel connections, and the maximum number of the first virtual numbers that interoperate with the subscriber network. And a routing table for storing information about channel connections, and a useful virtual channel connection table for storing information about the maximum number of the second number of useful virtual channel connections that are not currently in use among the virtual channel connections linked to the other network. In the aggregation method using a virtual channel connection between an asynchronous transmission mode network and another network, Determining a routing table entry location when a cell input is detected; searching for the useful virtual channel connection table when the determined routing table entry is not in use; A routing table entry for searching the useful virtual channel table to allocate a useful virtual channel connection table entry that is not currently in use and not in an updated state, and to route the input cell using information of the allocated useful virtual channel connection table entry The process of assigning And routing the cell through a virtual channel connection corresponding to the assigned routing table entry. The method of claim 7, wherein The useful virtual channel link table entry may include a useful flag indicating whether the corresponding useful virtual channel link table entry is useful, an update flag indicating whether the corresponding useful virtual channel link table entry is in an updated state, and an arbitrary cell to be inputted. And an output virtual path identifier indicating a virtual path number from which the cell is output, and an output virtual channel identifier indicating a channel number from which the cell is output. The method of claim 8, The routing table entry includes a valid flag indicating whether the corresponding routing table entry is a valid entry, a busy flag indicating whether the corresponding routing table entry is currently in use, and a virtual path identifier indicating a virtual path number to which the input cell is routed. And a virtual channel identifier indicating a virtual channel number to which the input cell is routed. The method of claim 9, After allocating a routing table entry for routing the input cell, write the virtual path number and virtual channel number of the assigned useful virtual channel connection entry to the virtual path identifier and virtual channel identifier of the routing table entry, and use the busy flag. Setting and updating information about the routing table entry; After updating the information on the routing table entry, the virtual path identifier and the virtual channel identifier of the allocated useful virtual channel connection entry are changed to an input virtual path identifier and an input virtual channel identifier, and the update flag is set to an updated state. And updating the information on the allocated useful virtual channel connection entry. The method of claim 10, Updating a subscriber virtual channel connection / useful virtual channel connection mapping table with the updated useful virtual channel entry information after updating the useful virtual channel entry; And after updating the mapping table, searching for the useful virtual channel entry table, searching for the updated entry, releasing the update setting of the update flag, and updating the mapping table. Asynchronous transmission mode One end is connected to the subscriber network, the other end is connected to the other network, the routing table for storing information about the virtual channel connection with the subscriber network, and the current of the virtual channel connection with the other network In the aggregation method using a virtual channel connection between an asynchronous transmission mode network and another network having a useful virtual channel connection table for storing information about the useful virtual channel connection that is not in use, Determining a routing table entry position when a cell input is detected, and if the determined routing table entry is not in use, searches for the useful virtual channel association table and has a useful virtual channel association table entry having virtual channel information to route the input cell. The process of assigning Updating a routing table entry with the virtual channel information of the assigned useful virtual channel table entry; Updating the useful virtual channel connection table entry after updating the routing table entry; And after updating the useful virtual channel connection table entry, controlling the cell to be routed through the virtual channel connection corresponding to the updated routing table entry. The method of claim 12, The useful virtual channel link table entry may include a useful flag indicating whether the corresponding useful virtual channel link table entry is useful, an update flag indicating whether the corresponding useful virtual channel link table entry is in an updated state, and an arbitrary cell to be inputted. And an output virtual path identifier indicating a virtual path number from which the cell is output, and an output virtual channel identifier indicating a channel number from which the cell is output. The method of claim 13, The routing table entry may include a valid flag indicating whether the corresponding routing table entry is a valid entry, a busy flag indicating whether the corresponding routing table entry is currently in use, and a virtual path identifier indicating a virtual path number to which the input cell is routed. And a virtual channel identifier indicating a virtual channel number to which the input cell is routed. The method of claim 14, After allocating a routing table entry for routing the input cell, write the virtual path number and virtual channel number of the assigned useful virtual channel connection entry to the virtual path identifier and virtual channel identifier of the routing table entry, and use the busy flag. Setting and updating information about the routing table entry; After updating the information on the routing table entry, the virtual path identifier and the virtual channel identifier of the allocated useful virtual channel connection entry are changed to an input virtual path identifier and an input virtual channel identifier, and the update flag is set to an updated state. And updating the information on the allocated useful virtual channel connection entry. The method of claim 15, Updating a subscriber virtual channel connection / useful virtual channel connection mapping table with the updated useful virtual channel entry information after updating the useful virtual channel entry; And after updating the mapping table, searching for the useful virtual channel entry table, searching for the updated entry, releasing the update setting of the update flag, and updating the mapping table.