JP3264247B2 - ATM communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ATM communication system, and more particularly to an ATM (Asynchronous Tra).
nsfer Mode) and a method for setting connection information in an ATM terminal and an ATM terminal.

[0002]

2. Description of the Related Art Conventionally, in an ATM exchange and an ATM terminal, when ATM cell connection information is statically set and inputted, the connection information is not changed until an operator deletes the setting regardless of the network conditions. Absent.

For example, as shown in FIG. 7, ATM switches include shapers 31-1, 31-i,..., 31-N.
A non-blocking switch 32, a control system 33,
There are output buffers 34-1, 34-i,..., 34-N.

In this configuration, the control system 33 includes a non-blocking switch 32 and shapers 31-1, 31-31.
,..., 31-N are set for each of the routing parameters and the shaping parameters, and whether connection is possible or not is determined.

[0005] The input lines 301-1, 301-i, ...,
Each output line 302-1,
,..., 302-N, the cells of the respective connections are routed to the shapers 31-1, 31-.
.., 31-N.

After that, the cell of each connection is supplied to the desired output line 30 by the non-blocking switch 32.
, 302-i,..., 302-N, and the desired output lines 302-1, 302-i,.
−N, output buffers 34-1, 34-i,..., 34
-N.

In the above-described ATM switch, the connection acceptance control is entirely performed in the control system 33. When a new connection setting request is received, whether to accept or reject the connection setting in accordance with a prescribed procedure. Has been determined.

The connection set by these procedures is not deleted until a deletion request is input from the control system 33 to this connection. AT above
The M switch is disclosed in JP-A-8-251186.

As a connection setting method other than the above, Japanese Patent Laid-Open Publication No. Hei 7-58748 discloses a method of referring to connection attribute information when congestion occurs in an individual ATM exchange, and corresponding to one of the connection cells. A method is disclosed in which a part or all of the traffic is discarded or a connection is cut off to regulate traffic autonomously.

Japanese Patent Application Laid-Open No. 9-266480 discloses a switch to which a failed link is connected, searches for a detour route to the connected switch, and detects a failure in the connection of the detour route searched by the own switch and the connected switch. A method of reassigning a link connection is disclosed.

[0011]

SUMMARY OF THE INVENTION The conventional ATM described above.
In the exchange, since the ATM connection connected via a plurality of ATM switches is deleted, the ATM connected via the ATM switch is deleted.
Connection information must be deleted from the control terminal for all switches.

In a conventional ATM exchange, an adjacent A
Since there is no means for knowing the ATM connection information of the TM switch, each ATM switch cannot recognize even if there is a discrepancy in the ATM connection setting between adjacent ATM switches.

The ATM connection path set differently is A
It cannot be used for communication between TM terminals.
Since the necessary bandwidth is allocated when setting the TM connection,
The bandwidth of the M switch is occupied unnecessarily.

Further, since the conventional ATM exchange has no means for knowing the state of the line failure with the adjacent ATM switch, the ATM connection set on the line with the line failure is retained unless the connection is deleted from the control terminal. .

An object of the present invention is to provide an ATM communication system which solves the above-mentioned problems, reduces the burden on the managing operator without wasting bandwidth, and reduces erroneous operations. Is to do.

[0016]

SUMMARY OF THE INVENTION An ATM communication system according to the present invention is an ATM communication system for performing asynchronous transfer mode communication between terminals through a plurality of ATM exchanges, and is connected between adjacent ATM exchanges. Transmitting means for converting connection information used in a circuit into cells and transmitting the connection information; comparing means for comparing the connection information received from the adjacent ATM exchange with connection information used by the own equipment in the connection of the circuit; A deletion means for deleting the connection information of the own apparatus when a mismatch is detected in the comparison of the means is provided in each of the plurality of ATM exchanges.

Another ATM communication system according to the present invention comprises:
An ATM communication system for performing asynchronous transfer mode communication between a first terminal and a second terminal through a plurality of ATM switches, wherein the ATM communication system communicates with an ATM switch adjacent to the first terminal.
Be used in the lines connected to the connection information to be used in the lines connected to the first transmission means for transmitting the cell conversion, between the ATM switch adjacent to the second terminal
A second transmitting unit that converts the connection information into a cell and transmits the connection information, and compares the connection information received from the ATM switch adjacent to the first terminal with connection information used by the own terminal for connection of the line. First comparing means, second comparing means for comparing the connection information received from an ATM exchange adjacent to the second terminal with connection information used by the own equipment for connection of the line, A first deletion unit that deletes the connection information of the own device when a mismatch is detected by the comparison of the first comparison unit; and a connection information of the own device when the mismatch is detected by the comparison of the second comparison unit. And a second deleting means for each of the plurality of ATM exchanges.

That is, in the ATM communication system of the present invention, an ATM connection identifier [hereinafter referred to as VPI (Virtual Path)] is used from an adjacent ATM exchange connected by a line to an ATM connection currently used in the line.
Identifier) / VCI (Virtual)
Channel Identifier)], and compares the information with the VPI / VCI value used by the own device for the ATM connection. If a mismatch is detected in the comparison result, the own device's ATM connection information is changed. It has a mechanism to delete.

As a result, the ATM connection information is always the same between adjacent ATM devices automatically without control from the control terminal. Therefore, when one ATM connection is made via a plurality of ATM exchanges, the deletion of the ATM connection information of one of the ATM exchanges only causes the deletion of the ATM connection information to the adjacent ATM exchange. Has spread to all ATM exchanges,
The M connection will be deleted.

In the case where the ATM connection information is erroneously input from the operator or a line failure occurs, the related ATM connection information is transmitted to the AT by the same mechanism.
It can be deleted by the operation between the M exchanges.

More specifically, the ATM switch is provided with first and second adjacent device connection information processing circuits for the first and second lines, respectively. In the first and second adjacent device connection information processing circuits, when the adjacent device use VPI / VCI extraction unit receives a connection information cell from an ATM switch connected on the opposite side of the line, the adjacent device uses the adjacent AT.
The VPI / VCI value used by the M exchange for the ATM connection is extracted.

Adjacent device use VPI extracted by adjacent device use VPI / VCI extraction unit by use VPI / VCI comparison unit
/ VCI table contents and the VPI / VCI used on the same line among the contents of the connection information table of the device.
As a result of the comparison, when there is a set of VPI / VCI values present in the connection information table of the present apparatus and not present in the VPI / VCI table used by the adjacent apparatus, the VPI / VCI is extracted from the connection information table of the present apparatus. Delete the connection you are using.

Therefore, in two adjacent ATM exchanges connected by one line, if the VPI / VCI values used on the line do not match, the two ATM exchanges in the ATM exchange must match each other. Of ATM connection information is deleted.

[0024]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an ATM exchange according to an embodiment of the present invention. In the figure, an ATM switch according to one embodiment of the present invention comprises line termination units 1 and 7, adjacent device connection information processing circuits 2 and 6, cell switch 3, connection information table 4, and control terminal 5. ing.

The line termination unit 1 terminates the transmission line of the line 100 to take out significant ATM cells, and the line termination unit 7 terminates the transmission line of the line 200 in the same manner as the line termination unit 1.
Take out the TM cell.

The adjacent device connection information processing circuit 2 takes out only the connection information cells from the significant ATM cells taken out by the line termination unit 1 and processes them, thereby outputting a deletion instruction to the connection information table 4 of the present device. Cell switch 3 for other cells
Output to

The adjacent device connection information processing circuit 6 extracts and processes only connection information cells from the significant ATM cells extracted by the line terminating unit 7 and outputs a deletion instruction to the connection information table 4 of the present device. Cell switch 3 for other cells
Output to

The cell switch 3 exchanges and transfers ATM cells from the adjacent device connection information processing circuits 2 and 6 according to the switch connection information in the connection information table 4. The connection information table 4 stores switch connection information according to connection information input from the control terminal 5.

FIG. 2 shows an adjacent device connection information processing circuit 2 of FIG.
FIG. 3 is a block diagram showing the configuration of FIG. In the figure, an adjacent device connection information processing circuit 2 includes a connection information cell separation unit 21, an adjacent device use VPI / VCI extraction unit 22, and an adjacent device use V
It comprises a PI / VCI table 23, a used VPI / VCI comparison unit 24, a connection information cell creation unit 25, and a connection information cell multiplexing unit 26.

The connection information cell separation section 21 separates the connection information cell and other cells from the ATM cells input from the line termination section 1. The adjacent device use VPI / VCI extraction unit 22 extracts the VPI / VCI value used in the corresponding line of the adjacent device from the connection information cell.

Adjacent device use VPI / VCI table 23
Stores the VPI / VCI information for adjacent devices extracted by the VPI / VCI for adjacent device extraction unit 22. VPI used
The / VCI comparison unit 24 refers to the contents of the adjacent device used VPI / VCI table 23 and all the used VPI / VCIs of the corresponding line in the connection information table 4, and detects a connection that exists only in the connection information table 4. Instruct the information table 4 to delete the connection information related to the VPI / VCI value.

The connection information cell creating section 25 converts the connection information from the connection information table 4 into ATM cells. The connection information cell multiplexing unit 26 multiplexes the cell from the cell switch 3 and the cell from the connection information cell creation unit 25, and
Output M cells.

Although not shown, the adjacent device connection information processing circuit 6 has the same configuration as that of the adjacent device connection information processing circuit 2, and the operation of each of the constituent units is the same as that of the adjacent device connection information processing circuit 2. It is similar.

The operation of the ATM switch according to one embodiment of the present invention will be described with reference to FIG. Usually, this type of ATM exchange is an apparatus for transferring ATM cells according to a connection method between lines input from the control terminal 5.

In general, the connection method between lines is specified by an incoming line number and a VPI (Virtual) used on the incoming line.
Path Identifier value and VCI (Vi
rtual Channel Identifier)
Value, outgoing line number, VPI value and VC used on outgoing line
This is performed by designating the I value.

For example, an incoming line number = 100, a VPI value used on an incoming line = 0, a VCI value = 32, an outgoing line number = 200, a VPI value = 1 used on an outgoing line, and a VCI value = 33. Is specified, the ATM switch outputs the cell header from the line 200 to the ATM cell having the cell header of VPI = 0 and VCI = 32 input from the line 100.
1, output after being changed to VCI = 33.

An incoming line number which is a designation of a connection method between lines in the ATM exchange, and a VP used on the incoming line
A set of the I value and the VCI value, the outgoing line number, and the VPI value and the VCI value used on the outgoing line is hereinafter referred to as connection information.

The ATM exchange stores the connection information in the connection information table 4 when the connection information is additionally inputted from the control terminal 5, and designates the connection information from the connection information table 4 when the connection is released. Delete connection information. The cell switch 3 transfers an ATM cell between the lines 100 and 200 according to the connection information stored in the connection information table 4.

The line terminating unit 1 performs signal processing in accordance with the transmission standard of the line 100, extracts only significant ATM cells and transmits them to the adjacent device connection information processing circuit 2, and at the same time, the line termination unit 1 After converting the ATM cell of line 10 according to the transmission standard of line 100,
Output to 0.

The line terminating unit 7 performs signal processing in accordance with the transmission standard of the line 200, extracts only significant ATM cells and transmits them to the adjacent device connection information processing circuit 6, and at the same time, the After converting the ATM cell of the line 20 according to the transmission standard of the line 200,
Output to 0.

The adjacent device connection information processing circuit 2 extracts and processes connection information cells used for transmission of connection information cells from significant ATM cells received from the line terminating unit 1 and processes the connection information cells existing in the connection information table 4. Then, the connection information to be deleted is detected from the connection information, and an instruction to delete the connection information is transmitted to the connection information table 4.

At the same time, the adjacent device connection information processing circuit 2
Is the used VP of the line 100 existing in the connection information table 4.
The I / VCI information is converted into ATM cells, multiplexed with the routing cells transferred from the cell switch 3, and output to the line termination unit 1.

The adjacent device connection information processing circuit 6 extracts and processes connection information cells used for transmission of connection information cells from significant ATM cells received from the line terminating unit 7, and processes the lines 200 existing in the connection information table 4. Then, the connection information to be deleted is detected from the connection information, and an instruction to delete the connection information is transmitted to the connection information table 4.

When the connection information table 4 receives a connection information deletion instruction from each of the adjacent device connection information processing circuits 2 and 6, it searches for the corresponding connection information from the table and deletes it from the table.

At the same time, the adjacent device connection information processing circuit 6
Is the used VP of the line 200 existing in the connection information table 4.
The I / VCI information is converted into ATM cells, multiplexed with the routing cells transferred from the cell switch 3, and output to the line termination unit 7.

FIG. 3 is a diagram showing a configuration example of a connection information cell used in one embodiment of the present invention. In the figure, the connection information cell excludes the 5-byte portion of the ATM cell header.
The set of the VPI value (1 byte) and the VCI value (2 bytes) registered as the connection information is directly inserted into the byte portion.

Therefore, for the connection information cell, it is predetermined that the transfer is performed using, for example, VPI = 0, VCI = 10, and the insertion format of the connection information is a format as shown in FIG. ing.

Next, the operation of the adjacent device connection information processing circuit 2 which is the center of the ATM exchange according to one embodiment of the present invention will be described with reference to FIGS. The connection information cell separation unit 21 separates the connection information cells from the ATM cells from the line termination unit 1 and outputs the connection information cells to the VPI / VCI extraction unit 22 used by the adjacent device.

In this case, based on the above assumption, the connection information cell separating unit 21 refers to only the ATM cell header and has the ATM having the cell header of VPI = 0 and VCI = 10.
By taking out only the cells, the connection information cells can be separated.

The connection information cell separation section 21 outputs all cells other than the connection information cells to the cell switch 3. Upon receiving the connection information cell output from the connection information cell separation unit 21, the adjacent device use VPI / VCI extraction unit 22 receives the VPI value used by the adjacent device (not shown) based on the format shown in FIG. And a set of VCI values. This VP
The set of the I value and the VCI value is stored in the VPI / VCI table 23 used by the adjacent device.

The VPI / VCI comparison unit 24 uses the ATM cell connection information stored in the connection information table 4 to determine the V used in the line to which the circuit is connected.
A set of the PI value and the VCI value is searched, and the same VPI is stored in the adjacent device use VPI / VCI table 23 for each of them.
It is determined whether a set of the value and the VCI value exists. The used VPI / VCI comparison unit 24 determines the same VPI
When recognizing that the set of the value and the VCI value does not exist, it outputs to the connection information table 4 an instruction to delete the connection information formed by the recognized line, VPI value, and VCI value.

The connection information cell creation unit 25 extracts a set of the VPI value and the VCI value used in the line to which the circuit is connected from the connection information in the connection information table 4. The set of the extracted VPI value and VCI value is converted into an ATM cell according to a format as shown in FIG. The connection information cell multiplexing unit 26 multiplexes the ATM cell transferred from the cell switch 3 and the connection information cell from the connection information cell creation unit 25 and outputs the multiplexed data to the line termination unit 1.

FIG. 4 is a block diagram showing a configuration example of a communication system according to one embodiment of the present invention. In the figure, 2
ATM terminal 1 via the ATM exchanges 11 and 12
An example is shown in which ATM communication is performed between 3 and 14.

The ATM communication between the ATM terminals 13 and 14 is A
The cell header between the TM terminal 13 and the line 100 of the ATM switch 11 is VPI = 0, VCI = 32,
Line 200 of M switch 11 and line 1 of ATM switch 12
VPI = 1, VCI = 33 between 00 and 00
It is assumed that the cell header communicates between the line 200 of the ATM switch 12 and the ATM terminal 14 with VPI = 2 and VCI = 32.

For this reason, the ATM exchange 11 has the line 10
0, VPI = 0, VCI = 32, line 200, VPI
= 1 and VCI = 33 are specified by the control terminal 15, and this information is stored in the connection information table 4. Similarly, ATM exchange 12 has line 100, VPI
= 1, VCI = 33 and line 200, VPI = 2, VCI
= 32 is specified by the control terminal 16,
This information is stored in the connection information table 4.

At this time, the line 200 of the ATM switch 11
3 reads VPI = 1 and VCI = 33 stored as connection information existing on the line 200 in the connection information table 4, and FIG.
Are converted into ATM cells according to the format shown in FIG. This cell is multiplexed with another ATM cell, passes through the line termination unit 7, and is output to the line 200 connected to the ATM switch 12.

Similarly, the line 10 of the ATM switch 12
0 reads the VPI = 1 and VCI = 33 stored as connection information existing on the line 100 in the connection information table 4 and converts them into a format as shown in FIG. Therefore, it is converted into an ATM cell. This cell is multiplexed with another ATM cell, passes through the line terminating unit 1, and passes through the line 10 connected to the ATM switch 11.
Output to 0.

The connection information cell separation unit 21 provided on the line 200 of the ATM switch 11 has the VPI = 1 and VCI = 3 transmitted from the ATM switch 12 to the ATM switch 11.
The connection information cell in which the value of “3” is written is separated, and the VPI / VCI extraction unit 22 for the adjacent device uses VPI = 1 and VCI = 33.
When it is recognized that this value is used in the corresponding line of the adjacent ATM exchange, the value is stored in the adjacent use VPI / VCI table 23.

At this time, since the connection information of the line 100, VPI = 0, VCI = 32 and line 200, VPI = 1, VCI = 33 exists in the connection information table 4 of the ATM exchange, the used VPI / VCI is used. The comparison unit 24 is connected to the line 2
The set of VPI = 1 and VCI = 33 existing in 00 is ATM
VPI / VCI table 23 used by adjacent devices of exchange 11
, No deletion instruction to the connection information table 4 is output.

In the system configuration shown in FIG.
When the communication between the ATM terminal 13 and the ATM terminal 14 is completed, the line 100 of the ATM switch 11, VPI = 0, VC
The connection between I = 32 and line 200, VPI = 1, VCI = 33, and the line 100, VPI = 1,
VCI = 33 and line 200, VPI = 2, VCI = 32
And the connection and need to be removed.

Here, the line 100, VPI = 1, VCI = 33 and the line 200, VP existing in the ATM switch 12
Only the connection information with I = 2 and VCI = 32 is transmitted to the control terminal 16
, The connection information is deleted from the connection information table 4 of the ATM switch 12. Therefore, AT
The connection information cell transmitted from the connection information cell creation unit 25 provided in the line 100 of the M exchange 12 has VPI =
1, VCI = 33 cannot be entered.

In the ATM switch 11, the adjacent device use VPI / VCI extraction unit 22 provided in the line 200 detects that VPI = 1 and VCI = 33 are unused from the contents of the connection information cell, and uses the adjacent device use. The value is deleted from the VPI / VCI table 23. At this time, the ATM switch 11
In the connection information table 4, the line 100, VPI = 0, V
Connection information exists between CI = 32, line 200, VPI = 1, and VCI = 33.

The used VPI / VCI comparison unit 24 provided on the line 200 of the ATM exchange 11
Although VPI = 1 and VCI = 33 of the line 200 are registered therein, since the VPI = 1 and VCI = 33 of the VPI / VCI table 23 used by the adjacent device are deleted, the line 200, VPI = 1 and VCI are deleted. = 33 is output to the connection information table 4 as an instruction to delete the related connection information.

The connection information table 4 contains the used VPI / VCI
Line 100, VPI according to deletion instruction from comparison unit 24
= 0, VCI = 32 and line 200, VPI = 1, VCI
= 33 is deleted. By this operation, only the ATM connection information of the ATM switch 12 is deleted, and the related A
The TM connection information can also be deleted from the ATM switch 11.

In one embodiment of the present invention, the ATM terminals 13, 1
Although an example in which two ATM exchanges 11 and 12 are connected between the four has been described, even when an ATM connection is established via three or more ATM exchanges according to one embodiment of the present invention, the Obviously, by simply deleting the ATM connection at one ATM exchange, the ATM connections of the other two ATM exchanges can also be deleted. Also,
The above operation is guaranteed even when a plurality of ATM connections exist on the lines 100 and 200.

FIG. 5 is a block diagram showing a configuration of an adjacent device connection information processing circuit of an ATM exchange according to another embodiment of the present invention. In the drawing, another embodiment of the present invention has the same configuration as that of the embodiment of the present invention shown in FIG. 2 except that a connection information cell disconnection detecting section 81 is added to the adjacent device connection information processing circuit 8. The same components are denoted by the same reference numerals.
The operation of the same component is the same as that of the embodiment of the present invention shown in FIG.

In another embodiment of the present invention, it is assumed that the connection information cell creation unit 25 performs the connection information cell creation at a certain period, and further receives the connection information cell output from the connection information cell separation unit 21 to receive the connection information cell. When there is no reception of connection information cells at a time interval longer than the cycle in which the cell creation unit 25 generates cells, the connection information cell disconnection detection unit 8 instructs the adjacent device use VPI / VCI table 23 to delete all table information.
1 is added.

FIG. 6 is a block diagram showing a disconnected state of a configuration example of a communication system according to another embodiment of the present invention. Referring to FIGS. 4 to 6, another embodiment of the present invention will be described with reference to FIG.
The operation when the present invention is applied to the M exchanges 11 and 12 will be described.

The connection information table 4 of the ATM switch 11 has a line 100, VPI = 0, VCI = 32 and a line 20
0, VPI = 1, VCI = 33, the connection information table 4 of the ATM switch 12 shows the line 100, VPI =
1, VCI = 33 and line 200, VPI = 2, VCI =
32 is stored.

The connection information cell creating section 25 provided on the line 200 of the ATM exchange 11 has VPI = 1, V
The cell with CI = 33 is periodically output to the ATM switch 12, and the connection information cell creating unit 25 provided on the line 100 of the ATM switch 12 has VPI = 1 and VCI = 33.
Are periodically output to the ATM switch 11.

Therefore, at normal times, the ATM switch 11
Since both the used VPI / VCI comparison unit 24 provided on the line 200 of the ATM switch 12 and the used VPI / VCI comparison unit 24 provided on the line 100 of the ATM exchange 12 detect the coincidence of the contents, the ATM exchange 11, No delete instruction is issued to the twelve connection information tables 4.

At this time, the connection information cell disconnection detection circuits 27 of the ATM exchanges 11 and 12 always receive the connection information cells before the disconnection detection time elapses. Does not send a table deletion instruction.

In the above state, if only the line in the direction from the ATM exchange 12 to the ATM exchange 11 is disconnected for some reason (see FIG. 6), the ATM exchange 11 transmits the connection information cell from the ATM exchange 12. Can not be received. Since the connection information cell disconnection detecting unit 27 provided in the line 200 of the ATM switch 11 cannot receive the connection information cell from the ATM switch 12, it detects the connection information cell disconnection and stores the connection information cell disconnection in the adjacent device use VPI / VCI table 23. Outputs a table deletion instruction.

Adjacent device use VPI / VCI table 23
When receiving the all-table delete instruction signal from the connection information cell disconnection detecting section 27, it deletes all the used VPI / VCI values from the table.

The used VPI / VCI comparison unit 24 provided in the line 200 of the ATM switch 11 is used to determine the connection information of the line 200 existing in the connection information table 4 and the VPI / VCI table of the currently used adjacent device which is empty. 23, and VPI = 1, only in the connection information table 4.
It detects that there is connection information of VCI = 33 and outputs a deletion instruction to the connection information table 4. Therefore, ATM
From the connection information table 4 of the exchange 11, the line 100, V
PI = 0, VCI = 32 and line 200, VPI = 1, V
The connection information with CI = 33 is deleted.

After this operation, the line 2 of the ATM switch 11
The information of VPI = 1 and VCI = 33 is also erased from the connection information cell output from the connection information cell creation unit 25 provided in 00.

As a result, the line 1 of the ATM switch 12
In the adjacent device use VPI / VCI extraction unit 22 provided in 00, VPI = 1 and VCI =
Since the connection information of the device 33 is no longer received, it is not registered in the VPI / VCI table 23 used by the adjacent device.

The used VPI / VCI comparison unit 24 of the ATM exchange 12 determines that the information of VPI = 1 and VCI = 33 of the connection information on the line 100 in the connection information table 4 does not exist in the VPI / VCI table 23 used by the adjacent device. Therefore, a deletion instruction is output to the connection information table 4. Therefore, AT
Line 100, VPI = 1, VCI =
The connection between 33 and the line 200, VPI = 2, VCI = 32 is deleted.

When the line from the ATM switch 12 to the ATM switch 11 is disconnected in the system configuration shown in FIG. 4 by the above-described operation, first, the connection information on the disconnected line among the connection information of the ATM switch 11 Everything is deleted. Thereafter, all the connection information on the disconnected line in the connection information of the ATM switch 12 is deleted. Therefore, by configuring the adjacent device connection information processing circuit 2 as shown in FIG. 5, it is possible to delete all the connection information of the line in which the line failure has occurred in the case of a line failure such as a line disconnection. By this operation, the band already allocated to the deleted connection information can be reused, so that the resources of the ATM exchange can be effectively used.

As described above, the AT of the adjacent ATM exchange is
By monitoring the mismatch between the M connection information and the ATM connection information of the own ATM switch, and deleting the ATM connection information when the mismatch occurs, the ATM connection between the ATM terminals is deleted. This eliminates the need for a deletion input from the control terminal. Therefore, ATM
The burden on the operator who manages the exchange can be reduced, and erroneous operations can be reduced.

[0081]

As described above, according to the present invention, in an ATM communication system for performing asynchronous transfer mode communication between terminals through a plurality of ATM exchanges, an adjacent AT
The connection information used in the line connected to the M exchange is converted into cells and transmitted, and the connection information received from the adjacent ATM exchange and the connection information used by the own equipment in the connection of the line are exchanged. By deleting the connection information of the own device when a mismatch is detected by comparison, it is possible to reduce the burden on the managing operator without wasting the bandwidth and reduce the number of erroneous operations. is there.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an ATM exchange according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an adjacent device connection information processing circuit of FIG. 1;

FIG. 3 is a diagram showing a configuration example of a connection information cell used in one embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration example of a communication system according to an embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an adjacent device connection information processing circuit of an ATM exchange according to another embodiment of the present invention.

FIG. 6 is a block diagram showing a disconnected state of a configuration example of a communication system according to another embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of an ATM switch according to a conventional example.

[Explanation of symbols]

 1,7 Line termination unit 2,6 Adjacent device connection information processing circuit 3 Cell switch 4 Connection information table 5,15,16 Control terminal 11,12 ATM exchange 13,14 ATM terminal 21 Connection information cell separation unit 22 Adjacent device use VPI / VCI extraction unit 23 Neighbor device use VPI / VCI table 24 Use VPI / VCI comparison unit 25 Connection information cell creation unit 26 Connection information cell multiplexing unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-157859 (JP, A) JP-A-6-104978 (JP, A) JP-A-58-27456 (JP, A) JP-A-2- 200049 (JP, A) JP-A-6-315047 (JP, A) JP-A-64-51855 (JP, A) JP-A-62-219846 (JP, A) JP-A-3-286645 (JP, A) JP-A-4-345342 (JP, A) JP-A-6-14057 (JP, A) JP-A-63-82143 (JP, A) JP-A-61-212943 (JP, A) (JP, B2) Tokuhyo Heihei 504665 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04L 12/56 H04L 12/28 H04M 3/22 H04M 7/06 H04Q 3 / 545

Claims (8)

(57) [Claims] 1. An ATM communication system for performing asynchronous transfer mode communication between terminals through a plurality of ATM exchanges, wherein connection information used on a line connected to an adjacent ATM exchange is converted into cells and transmitted. Transmitting means; comparing means for comparing the connection information received from the adjacent ATM exchange with connection information used by the own equipment for connection of the line; a TM communication system der that have a and deletion means for deleting the connection information to the plurality of ATM exchanges each
Therefore, the connection information is stored in the ATM connector used in the line.
ATM communication system characterized by a transaction identifier
Tem. 2. The ATM communication system according to claim 1, wherein a storage unit for storing connection information received from said adjacent ATM switch is included in each of said plurality of ATM switches. 3. Detecting means for detecting whether connection information from the adjacent ATM exchange has been received within a predetermined time, and detecting that the connection information has not been received by the detecting means. 3. The ATM communication system according to claim 2, further comprising means for deleting the stored contents of said storing means when said plurality of ATM exchanges are performed. 4. ATM communication according to any one of claims 1 to 3, the apparatus itself, characterized in that it comprises a storage means for storing connection information used to connect the line to the plurality of ATM exchanges each system. 5. An ATM communication system for performing asynchronous transfer mode communication between a first terminal and a second terminal through a plurality of ATM switches, wherein the ATM communication system is adjacent to the first terminal.
First transmission means for converting connection information used in a line connected to an exchange into cells and transmitting the information, and connection used in a line connected to an ATM exchange adjacent to the second terminal side A second transmitting means for converting the information into cells and transmitting the information; and a first transmitting means for comparing the connection information received from the ATM exchange adjacent to the first terminal with connection information used by the own equipment in connection of the line. Comparing means for comparing the connection information received from the ATM switch adjacent to the second terminal with connection information used by the own equipment for connection of the line, and the first comparing means A first deletion unit that deletes connection information of the own device when a mismatch is detected by comparison of the comparison unit; and a second deletion unit that deletes connection information of the own device when a mismatch is detected by comparison of the second comparison unit. And a plurality of deleting means. A A TM communication system that Yusuke each TM exchange, said connection information, ATM connections used in the line
ATM communication system characterized by a transaction identifier
Tem. 6. A first storage means for storing connection information received from an ATM exchange adjacent to the first terminal,
A second storage unit for storing connection information received from an ATM switch adjacent to the second terminal;
6. A according to claim 5, wherein each of the M exchanges is included.
TM communication system. 7. A first detecting means for detecting whether connection information from an ATM exchange adjacent to the first terminal is received within a predetermined time, and a first detecting means. A first storage content deleting unit for deleting the storage content of the first storage unit when detecting that the connection information has not been received, and connection information from an ATM exchange adjacent to the second terminal. Detecting means for detecting whether or not the connection information has been received within a predetermined time set in advance, and the second storing means when the second detecting means detects that the connection information has not been received. 7. The ATM communication system according to claim 6 , wherein each of said plurality of ATM exchanges includes a second stored content deleting means for deleting the stored content. 8. ATM communication according to claim 7 claim 5 apparatus itself, characterized in that it comprises a plurality of ATM exchanges, each storage means for storing connection information used to connect the line system.