JPH09261240A - Atm equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the accuracy of detection of cell mis-distribution without causing deterioration in a transmission efficiency and limit of an information source able to be monitored. SOLUTION: Receiver (R) side VP monitor sections 20-1 to 20-n of R side IF sections 2-1 to 2-n conduct synchronization processing of cells received from ATM terminal equipments 5-1 to 5-n and add a VP monitor number corresponding to a VPI number of the ATM terminal equipments 5-1 to 5-n to HEC bytes being areas not in use and send the result to sender (S) side IF sections 4-1 to 4-n via a switch section 3. S side VP monitor sections 40-1 to 4-n of the S side IF sections 4-1 to 4-n interpret a VP monitor number added to the HEC bytes of the S side input cell and give the result of interpretation to a control section 1. The control section 1 monitors mis-distributed cells by checking whether or not the VPI number of the sender is coincident with the VP monitor number of the result of interpretation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM device,
In particular, ATM (Asynchronous Transf)
er mode) relates to a cell misdelivery monitoring method for monitoring cell misdelivery in a device.

[0002]

2. Description of the Related Art Conventionally, as a cell misdistribution monitoring method of this type, in order to transmit information having temporal continuity by ATM exchange, other than the header of each cell (payload portion).
There is a method of detecting missing cells and erroneous delivery of cells by adding an information source identifier indicating an information source and a sequence number of continuity information and transmitting the information, and detecting the information on the receiving side.

That is, in the case of this method, as shown in FIG. 10, the byte division unit 52 of the reception unit 51 divides the continuous information output from the ATM terminal 50 into cells, and the insertion circuit 54 inserts the cells into the cells. The sequence number supplied from the sequence number addition unit 53 is added.

Further, in this cell, the supply information source identifier is inserted from the information source identifier adding section 55 in the inserting circuit 56, the header information is added in the header information adding section 57, and the cell is sent to the ATM switching system 58.

The ATM switching system 58 performs a switching operation using the header of the cell and transmits it to the receiving section 59 on the other side. In this way, from the transmission unit 51 to the ATM switching system 5
As shown in FIG. 11, in the cell transferred to the receiving unit 59 via 8, the sequence number and the information source identifier each consisting of 4 bytes are added to the beginning of the payload next to the cell header consisting of 5 bytes.

When the receiving section 59 receives the cell sent from the ATM switching system 58, the header information deleting section 6
At 0, the header is removed from the cell, and the extraction circuit 62 extracts the information source identifier in the cell.

The mis-distributed cell detection unit 61 discriminates whether or not the cell is mis-distributed due to the bit error of the header based on the information source identifier taken out by the take-out circuit 62. When the misdelivered cell detection unit 61 detects a misdelivered cell, it switches the switch 63 and discards the cell.

The fetch circuit 64 fetches the sequence number from the cell in which the misdelivery was not detected. Missing cell detector 6
Reference numeral 5 detects the presence or absence of cell omission based on the sequence number extracted by the extraction circuit 64. When detecting the occurrence of the cell omission, the cell omission detection unit 65 switches the switch 63 to insert the dummy information created by the dummy information creation unit 67 into the location where the cell omission occurred.

FIFO (First In First)
The Out) buffer 68 stores cells sequentially input through the switch 63 from the head position, and the ATM terminal 5
The continuous information output from 0 is restored and output to the destination ATM terminal 69. The above-mentioned cell misdistribution monitoring method is described in detail in Japanese Patent Laid-Open No. 3-139043.

[0010]

In the above-mentioned conventional cell misdistribution monitoring system, the receiving side compares the information source identifiers of the cells that are continuously received with the information source identifier of the cell that is first received as a reference, and Since it is detected whether or not it was delivered incorrectly, if the first received cell is delivered incorrectly, there is a possibility that the normal cells received after that may be determined as delivered incorrectly. However, the accuracy of cell misdelivery detection decreases.

Further, since the information source identifier provided for cell misdistribution monitoring is sent to the receiving side using the payload of the cell, the amount of information transmitted by the cell is reduced and the transmission efficiency is reduced. .

Further, since the information source identifier provided for cell misdelivery monitoring is 4 bits, only 16 kinds of information sources (ATM terminals) can be identified, and cell misdelivery monitoring information can be identified. The source is limited.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide an ATM device which can improve the accuracy of cell misdelivery detection without incurring a decrease in transmission efficiency and a limitation of an information source that can be monitored. To provide.

[0014]

A first AT according to the present invention
The M device includes a receiving-side interface that receives cells transferred in the asynchronous transfer mode via a transmission path, a switching unit that transfers the cells received by the receiving unit to a path to a destination, and the switching unit. An ATM device including a transmission-side interface for transmitting the cell whose route has been changed to a transmission line connected to the transmission destination,
Adding means provided in the receiving interface and adding preset monitoring information in the header portion of the received cell, and a cell provided in the transmitting interface and transmitting to a transmission line connected to the destination And an interpreter that interprets the monitoring information added to the.

In a second ATM device according to the present invention, in the above-mentioned configuration, the adding means is arranged at the synchronization information setting position in the header portion of the cell used when receiving the cell at the receiving side interface. It is configured to add monitoring information, and the interpreting unit is configured to interpret the monitoring information extracted from the setting position of the synchronization information.

The third ATM device according to the present invention includes a receiving means for receiving a cell to which a virtual path identifier indicating at least a transmission source is added and which is transferred in an asynchronous transfer mode via a transmission path, and the receiving means. Converting means for converting the virtual path identifier thus converted into a virtual path identifier indicating a destination, switching means for transferring the cell, the virtual path identifier of which has been converted by the converting means, to a path to the destination; An ATM device including a transmission side interface for transmitting a cell whose route has been changed to a transmission path connected to the transmission destination, wherein the virtual path identifier of the received cell provided in the reception side interface is stored. Is set in advance in the header part corresponding to the virtual path identifier before being converted by the converting means. Addition means for adding monitoring information, taking-out means for taking out the monitoring information added to the cell provided in the transmission side interface and sent to the transmission path connected to the destination, and the monitoring taken out by the taking-out means And a monitoring unit for monitoring the misdelivery of the cell by comparing the information with the virtual path identifier before being converted by the converting unit.

In a fourth ATM device according to the present invention, in the above-mentioned configuration, the adding means is provided at the setting position of the synchronization information in the header part of the cell used when receiving the cell at the receiving side interface. It is configured to add monitoring information, and the extracting means is configured to extract the monitoring information from the setting position of the synchronization information.

The fifth ATM device according to the present invention includes a receiving means for receiving a cell to which at least a virtual path identifier indicating a transmission source is added and which is transferred in an asynchronous transfer mode via a transmission line, and the receiving means. Converting means for converting the virtual path identifier thus converted into a virtual path identifier indicating a destination, switching means for transferring the cell, the virtual path identifier of which has been converted by the converting means, to a path to the destination; An ATM device including a transmission side interface for transmitting a cell whose route has been changed to a transmission path connected to the transmission destination, wherein the virtual path identifier of the received cell provided in the reception side interface is stored. Addition of monitoring information preset corresponding to the receiving side interface in the header part And a take-out means for taking out the virtual path identifier and the monitoring information added to a cell to be sent to a transmission path connected to the destination and provided in the transmission side interface, and the monitoring information and the transmission source. Holding means for holding in advance the virtual path identifier shown and the virtual path identifier converted by the converting means, the holding means based on the virtual path identifier taken out by the taking out means and the monitoring information taken out by the taking out means And monitoring means for monitoring the misdelivery of the cell by comparing with the virtual path identifier read by the conversion means and converted by the conversion means.

In a sixth ATM device according to the present invention, in the above-mentioned configuration, the adding means is provided at the setting position of the synchronization information in the header part of the cell used when receiving the cell at the receiving side interface. It is configured to add monitoring information, and the extracting means is configured to extract the virtual path identifier and the monitoring information from the header portion, respectively.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the operation of the present invention will be described below.

For monitoring cell misdelivery, the virtual path monitoring number of the cell arriving at the transmitting side interface section is interpreted as the virtual path monitoring number of the transmitting side virtual path monitoring section based on the source virtual path identifier number of the virtual path identifier converting section. And control section.

As a result, it is possible to improve the accuracy of the cell mis-delivery detection because the normal cell received after that in the state of the cell initially received as in the conventional method is not erroneously detected as the cell mis-delivery. Is possible.

In addition, the virtual path monitoring number of the cell arriving at the transmitting side interface section is monitored by the virtual path monitoring number interpreting section and the control section of the transmitting side virtual path monitoring section on the basis of the receiving side interface section to monitor the cell misdelivery. To do. As a result, it is possible to improve the accuracy of cell misdelivery detection because it is possible to prevent a normal cell received thereafter from being falsely detected as a cell misdelivery in the state of the cell initially received as in the conventional method. Become.

Further, instead of the cell mis-delivery monitoring method using the payload portion of the cell as in the conventional method, HEC (in the unused area after the cell synchronization processing in the receiving section of the receiving side interface section becomes HEC ( Header Er
The position of the Ror Control byte is used for transmitting the virtual path monitoring number. This can prevent a decrease in transmission efficiency.

Furthermore, since 8 bits are allocated to the virtual path monitoring number for cell misdistribution monitoring control, it is possible to identify 256 types of information sources (the number of ATM terminals), which is 16 times that of the conventional system. This makes it possible to improve the number of information sources (the number of ATM terminals) that can monitor misdelivery of cells, compared to the conventional case. Therefore, it is possible to improve the accuracy of cell misdistribution detection without lowering the transmission efficiency and limiting the information sources that can be monitored.

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the figure, an ATM device according to an embodiment of the present invention includes a control unit 1 and ATM terminals 5-1 to 5-1 on the transmitting side.
Receiving side interface sections (hereinafter, referred to as R side IF sections) 2-1 to 2-n, switch (SW) section 3, and receiving side ATM terminals 6-1 to 6-, respectively connected to 5-n. The transmission-side interface units (hereinafter, S-side I)
It is referred to as F part) 4-1 to 4-n.

Each of the R side IF sections 2-1 to 2-n has a receiving side virtual path monitoring section (hereinafter referred to as an R side VP monitoring section) 2.
0-1 to 20-n, and R side VP monitoring unit 20-
1 to 20-n are the unused areas after performing the synchronization processing of the cells respectively received from the ATM terminals 5-1 to 5-n.
A virtual path monitoring number (hereinafter referred to as a VP monitoring number) corresponding to a virtual path identifier (hereinafter referred to as a VPI number) of the ATM terminals 5-1 to 5-n in the EC byte (0 to
255) is added, and the cell is set to the output cell on the reception side (hereinafter,
It is sent to the switch unit 3 as 120-1 to 120-n (which are R-side output cells).

At this time, each of the R side IF sections 2-1 to 2-n receives the virtual path monitoring number notification signal on the receiving side (hereinafter referred to as a VP monitoring number notification signal on the R side) 101-1 to 101-n.
The VP monitor number added to the HEC byte of the cell is sent to the control unit 1.

The switcher unit 3 includes a virtual path identifier conversion unit (hereinafter referred to as a VPI conversion unit) 30 and a cell switch unit (n × n SW) 31. VPI converter 3
0 is the cell switch unit 3 by converting the VPI number of the transmission source in the header added to the cell transmitted from each of the R side IF units 2-1 to 2-n into the VPI number of the routing destination.
Send to 1.

The cell switch unit 31 routes the cell from the VPI conversion unit 30 according to the VPI number of the routing destination, and sets the transmission side input cells (hereinafter referred to as S side input cells) 130-1 to 130-n to S. Side IF section 4-1 to 4-
n.

For example, if the cell from the ATM terminal 5-1 is A
When transmitting to the TM terminal 6-n, the cell switch unit 31 sends the cell from the transmission line connected to the ATM terminal 5-1 to the AT terminal.
Routing for sending to the transmission line connected to the M terminal 6-n, that is, the S side I connected to the ATM terminal 6-n
The S-side input cell 130-n is sent to the F section 4-n.

Each of the S side IF sections 4-1 to 4-n has a transmission side virtual path monitoring section (hereinafter referred to as an S side VP monitoring section) 4
0-1 to 40-n, and the S-side VP monitoring unit 40-
1 to 40-n interpret the VP monitoring number added to the HEC byte of the S-side input cells 130-1 to 130-n sent from the switch unit 3.

At this time, each of the S-side IF units 4-1 to 4-n transmits the transmission-side virtual path monitoring number notification signal (hereinafter referred to as the S-side VP monitoring number notification signal) 103-1 to 103-n.
Sends the interpretation results of the S-side VP monitoring units 40-1 to 40-n to the control unit 1.

The control unit 1 specifies the S specified by the S-side VP monitoring number notification signals 103-1 to 103-n to which the interpretation result is sent.
Highway numbers of the side IF units 4-1 to 4-n (hereinafter, HW
The switch unit 3 is referred to as a number) to check whether the VPI number of the transmission source obtained through the VPI conversion unit communication signal 102 and the VP monitoring number of the interpretation result match and whether the cell is correctly delivered. Determine whether or not.

FIG. 2 is a block diagram showing the configuration of the control unit 1 of FIG. In the figure, the control unit 1 includes a virtual path monitoring number determination unit (hereinafter referred to as a VP monitoring number determination unit) 11
And the virtual path monitoring number error display section (hereinafter VP
The monitoring number error display section) 12).

The VP monitor number judging section 11 is an S side IF section 4-
1 to 4-n from each S side VP monitoring number notification signal 103-
The VP monitoring number sent through 1-103-n is
The S-side VP monitoring number notification signal 103-1 to 103-n
The VP of the transmission source of the VPI conversion unit 30 in the switch unit 3 obtained from the VPI conversion unit communication signal 102 by referring to the switch unit 3 with the HW numbers of the S-side IF units 4-1 to 4-n specified by
It is determined whether or not it matches the I number.

The VP monitoring number judging unit 11 outputs a virtual path monitoring number error signal (hereinafter, referred to as a VP monitoring number error signal) 1 indicating a cell misdelivery detection when the judgment results do not match.
11 is output to the VP monitoring number error display unit 12. VP
The monitoring number error display section 12 displays the VP monitoring number error signal 1
When 11 is received, a VP monitoring number error, that is, a cell misdelivery detection is displayed.

FIG. 3 is a block diagram showing the configuration of the R side IF section 2-1 of FIG. In the figure, the R-side IF unit 2-1 includes an R-side VP monitoring unit 20-1 and a receiving unit 24-1, and the R-side VP monitoring unit 20-1 is a virtual path monitoring number adding unit (hereinafter, VP). 21-1 for monitoring number addition section
And an old HEC byte detection counter section 22-1 and a clock section 23-1.

The receiving section 24-1 performs the synchronization processing of the cell using the HEC byte of the cell sent from the ATM terminal 5-1, and the receiving side input cell (hereinafter referred to as the R side input cell) 121- 1 is sent to the VP monitoring number adding section 21-1 of the R side VP monitoring section 20-1 and the ATM terminal 5-
The cell pulse 122-1 indicating the head position of the cell from 1 is output to the old HEC byte detection counter section 22-1.

Here, H of the cell from the ATM terminal 5-1
The EC byte becomes an unused area due to the synchronization processing of the receiving unit 24-1. Hereinafter, this unused area is referred to as an old HEC byte. The cell pulse 122-1 is a signal that clears the count value of the old HEC byte detection counter unit 22-1 to zero.

Clock unit 23 of R side VP monitoring unit 20-1
-1 outputs the byte position indication signal 124-1 to the old HEC byte detection counter section 22-1. The old HEC byte detection counter unit 22-1 counts the byte position designating signal 124-1 from the clock unit 23-1, and detects the fifth byte from the beginning position of the cell (counter value = 5), the old HEC byte position. The instruction signal 123-1 is output to the VP monitoring number adding section 21-1.

When the VP monitor number adding section 21-1 receives the old HEC byte position indication signal 123-1 from the old HEC byte detecting counter section 22-1, the old HEC byte position indicating signal 123-1 is input at that time.
The R-side input cell 121-1 from the receiving unit 24-1 corresponding to the EC byte position corresponds to the VPI number of each of the ATM terminals 5-1 to 5-n, that is, a VP preset in VPI number units. The monitoring number (0 to 255) is added and the R
The side output cell 120-1 is sent to the switch unit 3.

At this time, the VP monitoring number adding section 21-1 has the R side VP monitoring number notification signal 10 including the VP monitoring number.
1-1 is output to the control unit 1. Although not shown,
The configuration of each of the R-side IF units 2-2 to 2-n is the above-mentioned R-side IF.
The configuration of the section 2-1 is the same as that of the section 2-1.

FIG. 4 is a diagram showing the structure of the conversion table of the VPI conversion unit 30 of FIG. In the figure, in the conversion table of the VPI conversion unit 30, the transmission source HW number (# 1, #
3, # 4, ...) and VPI number (VPI # 1, VPI
# 2, VPI # 1, ...) Corresponding to each of the HW numbers (# 1, # 2, # 1 ,.
...) and VPI number (VPI # 10, VPI # 20, V
PI # 30, ...) Is stored. The contents of the conversion table can be changed externally.

FIG. 5 is a block diagram showing the configuration of the S-side IF section 4-1 in FIG. In the figure, the S-side IF unit 4-1 includes an S-side VP monitoring unit 40-1 and a transmission unit 44-1. The S-side VP monitoring unit 40-1 is a virtual path monitoring number interpretation unit (hereinafter, VP). Monitoring number interpretation unit) 41-1
And an old HEC byte detection counter section 42-1 and a clock section 43-1.

The transmission unit 44-1 performs transmission processing on the S-side input cell 130-1 sent from the switch unit 3, and sends the S-side output cell 141-1 to the S-side VP monitoring unit 40.
-1 to the VP monitoring number interpreting unit 41-1 and outputs a cell pulse 142-1 indicating the head position of the S-side input cell 130-1 from the switch unit 3 to the old HEC byte detection counter unit 42-1. . Where cell pulse 1
Reference numeral 42-1 is a signal for clearing the count value of the old HEC byte detection counter section 42-1 to zero.

Clock unit 43 of S-side VP monitoring unit 40-1
-1 outputs the byte position indication signal 144-1 to the old HEC byte detection counter section 42-1. The old HEC byte detection counter unit 42-1 counts the byte position indication signal 144-1 from the clock unit 43-1 and detects the fifth byte from the start position of the cell (counter value = 5). The instruction signal 143-1 is output to the VP monitoring number interpretation unit 41-1.

When the VP monitor number interpreting unit 41-1 receives the old HEC byte position indication signal 143-1 from the old HEC byte detecting counter unit 42-1, the old HEC byte input signal 143-1 input at that time is input.
Interpret the VP monitoring number added to the S-side output cell 141-1 from the transmission unit 44-1 corresponding to the EC byte position,
S-side VP monitoring number notification signal 10 including the VP monitoring number
3-1 is output to the control unit 1.

Although not shown, the S-side IF unit 4-2
Each of 4-n has the same configuration as that of the S-side IF section 4-1 described above, and the operation of the components is also the same as that of the S-side IF section 4 described above.
The operation is the same as that of -1.

FIG. 6 is a diagram showing a cell format in one embodiment of the present invention. A cell in one embodiment of the present invention is composed of a cell header storing a VPI number and the like, and a payload part, and 5 bytes of the cell header store an HEC byte for cell synchronization processing.
Since this HEC byte becomes an unused area after the cell synchronization processing is completed, it is used as a storage area for the VP monitoring number in one embodiment of the present invention.

The operation of one embodiment of the present invention will be described with reference to FIGS. First, in the conversion table of the VPI conversion unit 30, the transmission source R-side IF unit 2-1 (HW number =
# 1, VPI number = VPI # 1, S-side IF unit 4-1 (HW number = # 1, VPI) as a routing destination
Number = VPI # 10) is set, R side I
The case where the cell A is transmitted from the ATM terminal 5-1 connected to the F section 2-1 will be described.

The cell A from the ATM terminal 5-1 is the IF on the R side.
When transmitted to the unit 2-1, the R side IF unit 2-1 causes the VP monitoring number adding unit 21-1 to assign the VP monitoring number (here, VPI # 1) corresponding to the VPI number (here, VPI # 1) to the cell A. ,
“1”) is added, and the S-side IF unit 4 via the switch unit 3
Transfer to -1. The VP monitoring number is the VPI conversion unit 30.
It is fixed unless the content of the conversion table of is changed.

At this time, the VP monitoring number interpreting unit 41-1 of the S side IF unit 4-1 interprets the VP monitoring number (= "1") added to the cell A, and the VP monitoring number (= "1"). ")
S side VP monitoring number notification signal 103-1 including
Output to

In the VP monitoring number judging section 11 of the control section 1, S
The VP monitor number (= “1”) notified by the side VP monitor number notification signal 103-1 and the HW number of the S side IF unit 4-1 specified by the S side VP monitor number notification signal 103-1. The source V of the VPI conversion unit 30 in the switch unit 3 obtained from the VPI conversion unit communication signal 102 by referring to the switch unit 3
Compare with the PI number (= "1").

If the VP monitoring number and the VPI number of the transmission source match, the VP monitoring number determining unit 11 determines that the cell is normally delivered. If the VP monitoring number and the VPI number of the transmission source do not match, the VP monitoring number determination unit 11 determines that the cell is erroneously delivered, and outputs the VP monitoring number error signal 111 indicating the cell misdelivery detection to the VP. It is output to the monitoring number error display unit 12 to display the cell misdelivery detection.

Next, in the conversion table of the VPI conversion unit 30, the transmission side R side IF unit 2-3 (HW number = # 3, VPI
No. = VPI # 2), S as the routing destination
Side IF unit 4-2 (HW number = # 2, VPI number = VPI
A case where cell B is transmitted from the ATM terminal 5-3 connected to the R side IF section 2-3 in the state where # 20) is set will be described.

Cell B from ATM terminal 5-3 is the IF on the R side
When sent to the unit 2-3, the R side IF unit 2-3 uses the VP monitoring number adding unit 21-3 (not shown) to assign the VP corresponding to the VPI number (here, VPI # 2) to the cell B. A monitoring number (here, “2”) is added and transferred to the S-side IF section 4-2 via the switch section 3.

At this time, the VP monitoring number interpretation unit 41-2 (not shown) of the S-side IF unit 4-2 adds the V added to the cell B.
An S-side VP monitor number notification signal 103- which interprets the P monitor number (= "2") and includes the VP monitor number (= "2")
2 (not shown) is output to the control unit 1.

In the VP monitoring number judging section 11 of the control section 1, S
The VP monitor number (= “2”) notified by the side VP monitor number notification signal 103-2 and the HW number of the S side IF unit 4-2 specified by the S side VP monitor number notification signal 103-2. The source V of the VPI conversion unit 30 in the switch unit 3 obtained from the VPI conversion unit communication signal 102 by referring to the switch unit 3
Compare with the PI number (= “2”).

If the VP monitoring number and the VPI number of the transmission source match, the VP monitoring number determining unit 11 determines that the cell is normally delivered. If the VP monitoring number and the VPI number of the transmission source do not match, the VP monitoring number determination unit 11 determines that the cell is erroneously delivered, and outputs the VP monitoring number error signal 111 indicating the cell misdelivery detection to the VP. It is output to the monitoring number error display unit 12 to display the cell misdelivery detection.

FIG. 7 is a block diagram showing the structure of a control unit according to another embodiment of the present invention. In the figure, the control unit 7 includes a VP monitoring number determining unit 11, a VP monitoring number error display unit 12, and a virtual path monitoring number sorting unit (hereinafter referred to as VP).
Monitoring number sorting section) 70.
The VP monitoring number judging unit 11 and the VP monitoring number error display unit 12 are the control unit 1 according to the embodiment of the present invention shown in FIG.
The same as the VP monitoring number determination unit 11 and the VP monitoring number error display unit 12 and their operations are also the same.

The VP monitoring number sorting unit 70 refers to the VPI converting unit 30 in the switch unit 3 through the VPI converting unit communication signal 102, and associates 256 different VP monitoring numbers for each conversion table.

That is, the VP monitoring number sorting unit 70
The contents of the conversion table of the PI conversion unit 30 are fetched, a VP monitoring number is given to each source information in the conversion table, and R side VP monitoring number notification signals 101-1 to 101-n.
The VP monitoring number through the R side IF section 2-1 to 2-n
It is set in each VP monitoring number addition section 21-1 to 21-n.

The VP monitoring number judging section 11 is an S side IF section 4-
1 to 4-n from each S side VP monitoring number notification signal 103-
V in the cell header sent through 1-103-n
PI number and its S-side VP monitoring number notification signal 103-1
HW number of each of the S-side IF units 4-1 to 4-n specified by 103-n, and the S-side VP monitoring number notification signal 103-1
10-n based on the VP monitoring number sent via the VPI converting unit communication signal 170 based on the VP monitoring number and the routing destination VPI number and H from the VP monitoring number sorting unit 70.
It is determined whether the W number matches.

The VP monitoring number judging section 11 outputs a VP monitoring number error signal 111 indicating the detection of a cell misdelivery to the VP monitoring number error display section 12 when the judgment results do not match. V
Upon receiving the VP monitoring number error signal 111, the P monitoring number error display unit 12 displays a VP monitoring number error, that is, a cell misdelivery detection.

FIG. 8 is a diagram showing the structure of the reference table of the VP monitoring number sorting unit 70 of FIG. In the figure, VP
In the reference table of the monitoring number sorting unit 70, the transmission source HW number (# 1,
# 3, # 4, ...) and VPI number (VPI # 1, VP
I # 2, VPI # 1, ...) and the preset routing destination HW numbers (# 1, # 2, # 1, ...) and V
PI number (VPI # 10, VPI # 20, VPI # 3
0, ...) are stored. The contents of the reference table of the VP monitoring number sorting unit 70 are changed according to the contents of the conversion table of the VPI conversion unit 30.

For example, the VP monitoring number is 1 to as described above.
If 256 is set, the VP monitoring number sorting unit 70 sets R
VP monitoring number adding unit 21 of each of the side IF units 2-1 to 2-n
R side VP including these VP monitoring numbers in -1 to 21-n
The monitoring number notification signals 101-1 to 101-n are output.

The VP monitoring number adding units 21-1 to 21-n store the VP monitoring number included in the R side VP monitoring number notification signals 101-1 to 101-n in an internal register or the like not shown, and the ATM terminal 5 The VP monitoring number is added to the cells sent from -1 to 5-n, and the cells are output to the switch unit 3.

The switch section 3 includes the R side IF sections 2-1 to 2-n.
Routing is performed on cells from each side, and S-side IF units 4-1 to 4-1 are used as S-side input cells 130-1 to 130-n.
Send to 4-n.

In the S side IF units 4-1 to 4-n, the VP monitoring number interpreting units 41-1 to 41-n (VP monitoring number interpreting unit 41
-2 to 41-n are not shown) and the S-side input cell 130-1
Interpret the VP monitoring number in the cell header of ~ 130-n,
The VP monitoring number and the S-side input cells 130-1 to 130-
The S-side VP monitoring number notification signals 103-1 to 103-n including the VPI number in the cell header of n are output to the VP monitoring number determining unit 11 of the control unit 1.

The VP monitoring number determining unit 11 includes the VPI number included in the S-side VP monitoring number notification signals 103-1 to 103-n and the S-side VP monitoring number notification signals 103-1 to 103-.
HW to which the S-side IF units 4-1 to 4-n specified by n belong
Number and VP monitoring number sorting unit 70 based on the VP monitoring number
Destination VP read from the reference table
It is determined whether or not the I number and the HW number match.

The VP monitoring number determining section 11 outputs a VP monitoring number error signal 111 indicating cell misdistribution detection to the VP monitoring number error display section 12 when the determination results do not match. V
Upon receiving the VP monitoring number error signal 111, the P monitoring number error display unit 12 displays a VP monitoring number error, that is, a cell misdelivery detection.

FIG. 9 shows an S side IF according to another embodiment of the present invention.
It is a block diagram which shows the structure of a part. In the figure, S side I
The F unit 4-1 includes an S-side VP monitoring unit 45-1 and a transmission unit 44-1.
The S-side VP monitoring unit 45-1 includes a VP monitoring number interpretation unit 46-1 and an old HEC byte detection counter unit 4
2-1 and a clock unit 43-1.

The transmission unit 44-1 performs transmission processing on the S-side input cell 130-1 sent from the switch unit 3, and sends the S-side output cell 141-1 to the S-side VP monitoring unit 40.
-1 to the VP monitor number interpreting unit 41-1 of -1, and the cell pulse 142-1 indicating the start position of the S-side input cell 130-1 from the switch unit 3 is monitored by the old HEC byte detection counter unit 42-1 and the VP. It is output to the number interpretation unit 46-1. Here, the cell pulse 142-1 is a signal for clearing the count value of the old HEC byte detection counter section 42-1 to zero.

Clock unit 43 of S-side VP monitoring unit 45-1
-1 outputs the byte position indication signal 144-1 to the old HEC byte detection counter section 42-1. The old HEC byte detection counter unit 42-1 counts the byte position indication signal 144-1 from the clock unit 43-1 and detects the fifth byte from the start position of the cell (counter value = 5). The instruction signal 143-1 is output to the VP monitoring number interpretation unit 46-1.

The VP monitoring number interpreting unit 46-1 is the transmitting unit 44.
When the cell pulse 142-1 from -1 is received, the VPI number in the cell header input at that time is held in the register (not shown).

Further, the VP monitoring number interpreting unit 46-1 uses the old H
When the old HEC byte position indication signal 143-1 from the EC byte detection counter section 42-1 is received, it is added to the S side output cell 141-1 from the transmission section 44-1 corresponding to the old HEC byte position input at that time. Interpret the VP monitor number that was set.

The VP monitoring number interpreting unit 46-1 sends the S side VP monitoring number notification signal 103-1 including the VPI number and the VP monitoring number in the cell header held in the register to the control unit 1.
Output to

Although not shown, the S-side IF unit 4-2
Each of 4-n has the same configuration as that of the S-side IF section 4-1 described above, and the operation of the components is also the same as that of the S-side IF section 4 described above.
The operation is the same as that of -1.

The operation of another embodiment of the present invention will be described with reference to FIGS. 1, 3, 4, and 6-9. First, in the conversion table of the VPI conversion unit 30, the source side R side I
F section 2-1 (HW number = # 1, VPI number = VPI #
In contrast to 1), the S-side IF unit 4-1 as a routing destination
The AT connected to the R side IF unit 2-1 in the state where (HW number = # 1, VPI number = VPI # 10) is set.
A case where the cell A is transmitted from the M terminal 5-1 will be described.

The cell A from the ATM terminal 5-1 is the R side IF.
When transmitted to the unit 2-1, the R-side IF unit 2-1 causes the VP monitoring number adding unit 21-1 to add the VP monitoring number corresponding to the cell A to the R-side IF unit 2-1 (here, "1". ") Is added and transferred to the S-side IF unit 4-1 via the switch unit 3. still,
The VP monitoring number is fixed as long as the contents of the conversion table of the VPI conversion unit 30 do not change.

At this time, the VP monitor number interpreting unit 46-1 of the S side IF unit 4-1 interprets the VP monitor number (= "1") added to the cell A, and the VPI in the cell header of the cell A.
S including the number and the VP monitoring number (= “1”) of the interpretation result
The side VP monitoring number notification signal 103-1 is output to the control unit 7.

In the VP monitoring number judging section 11 of the control section 7, S
S-side IF unit 4-1 specified by the VPI number (= VPI # 10) in the cell header included in the side VP monitoring number notification signal 103-1 and the S-side VP monitoring number notification signal 103-1
Based on the HW number (= # 1) to which the group belongs and the VP monitoring number (= “1”) included in the S-side VP monitoring number notification signal 103-1, the routing obtained from the reference table of the VP monitoring number sorting unit 70. It is determined whether the previous VPI number (= VPI # 10) and the HW number (= # 1) match each other.

The VP monitoring number judging unit 11 judges that the cell is normally delivered if the judgment results match.
Further, if the determination results do not match, the VP monitoring number determination unit 11 determines that the cell is erroneously delivered, and outputs the VP monitoring number error signal 111 indicating the detection of erroneous cell distribution to the VP monitoring number error display unit 12. Then, cell misdelivery detection is displayed.

Next, in the conversion table of the VPI conversion unit 30, the transmission side R side IF unit 2-3 (HW number = # 3, VPI
No. = VPI # 2), S as the routing destination
Side IF unit 4-2 (HW number = # 2, VPI number = VPI
A case where cell B is transmitted from the ATM terminal 5-3 connected to the R side IF section 2-3 in the state where # 20) is set will be described.

The cell B from the ATM terminal 5-3 is the IF on the R side.
When sent to the unit 2-3, the R-side IF unit 2-3 causes the VP monitoring number adding unit 21-3 to assign the cell B to the VP monitoring number corresponding to the R-side IF unit 2-3 (here, "2. ") Is added and transferred to the S-side IF unit 4-2 via the switch unit 3.

At this time, the VP monitoring number interpretation unit 41-2 of the S side IF unit 4-2 interprets the VP monitoring number (= “2”) added to the cell B, and the VP monitoring number (= “2”). ")
And the VPI number in the cell header of cell B (= VPI # 2
0) and the S-side VP monitoring number notification signal 103-2 are output to the control unit 7.

In the VP monitoring number judging section 11 of the control section 7, S
S-side IF unit 4-2 specified by the VPI number (= VPI # 20) in the cell header included in the side VP monitoring number notification signal 103-2 and the S-side VP monitoring number notification signal 103-2
Based on the HW number (= # 2) to which VP belongs and the VP monitoring number (= “2”) included in the S-side VP monitoring number notification signal 103-2, the routing obtained from the reference table of the VP monitoring number sorting unit 70. It is determined whether the above VPI number (= VPI # 20) and HW number (= # 2) match each other.

If the determination results match, the VP monitoring number determination unit 11 determines that the cell is delivered normally.
Further, if the determination results do not match, the VP monitoring number determination unit 11 determines that the cell is erroneously delivered, and outputs the VP monitoring number error signal 111 indicating the detection of erroneous cell distribution to the VP monitoring number error display unit 12. Then, cell misdelivery detection is displayed.

In the cell misdelivery monitoring system according to the above-described one embodiment and another embodiment of the present invention, the S-side IF unit 4-1 monitors the cell misdelivery based on the VPI number of the transmission source of the VPI conversion unit 30.
Since the VP monitoring numbers of the cells arriving at ~ 4 to -n are monitored, it is possible to erroneously detect a normal cell received thereafter as a cell misdelivery in the state of the first received cell as in the conventional method. There is nothing. For this reason, highly accurate cell misplacement monitoring is possible.

Further, the cell misdelivery monitoring method according to one embodiment and another embodiment of the present invention is not the cell misdelivery monitoring method using the payload portion of the cell as in the conventional method, but the cell misdelivery monitoring method is not performed after the cell synchronization processing. Since the method uses the HEC byte that has become the usage area, the transmission efficiency is higher than that of the conventional method.

Furthermore, the cell misdistribution monitoring system according to one embodiment and another embodiment of the present invention uses the 8-bit old HEC byte for the cell misdistribution monitoring control, so that it is 16 compared to the conventional system. It is possible to identify twice as many information sources (ATM terminals).

As described above, the S-side IF units 4-1 to 4-1 are used to monitor cell misdelivery based on the source VPI number of the VPI conversion unit 30.
The VP monitoring numbers of the cells arriving at 4-n are assigned to the S-side VP monitoring units 40-1 to 40-n (S-side VP monitoring units 40-2 to 40-).
(n is not shown) VP monitoring number interpretation units 41-1 to 41-
n (the VP monitoring number interpreting units 41-2 to 41-n are not shown) and the control unit 1 monitor the cells to be normally received in the state of the first received cell as in the conventional method. Since it is not erroneously detected as a cell erroneous distribution, the accuracy of cell erroneous detection can be improved.

In addition, monitoring of cell misdelivery is performed by the R side IF section 2-1.
~ 2-n as a reference, the VP monitoring numbers of the cells arriving at the S-side IF units 4-1 to 4-n are set to the S-side VP monitoring units 45-1 to 45-.
n (S side VP monitoring units 45-2 to 45-n are not shown) VP monitoring number interpretation units 46-1 to 46-n (VP monitoring number interpretation units 46-2 to 46-n are not shown) Also, by monitoring by the control unit 7, it is possible to prevent a normal cell received after that from being falsely detected as a cell misdelivery in the state of the cell initially received as in the conventional method. Can be improved.

Furthermore, the R side IF is not used instead of the cell misdistribution monitoring method using the cell payload portion as in the conventional method.
HEC bytes in the cell header that has become an unused area after the cell synchronization processing in the reception units 24-1 to 24-n (reception units 24-2 to 24-n are not shown) of the units 2-1 to 2-n It is possible to prevent a decrease in transmission efficiency by using the position of 1 for transmitting the VP monitoring number.

Furthermore, since 8 bits are allocated to the VP number for cell misdistribution monitoring control, it is possible to identify 256 types of information sources (the number of ATM terminals), which is 16 times that of the conventional system. , Information sources that can monitor misdelivery of cells (AT
The number of M terminals) can be improved as compared with the conventional one.

Therefore, it is possible to improve the accuracy of cell mis-distribution detection without lowering the transmission efficiency and limiting the information sources that can be monitored.

[0098]

As described above, according to the present invention, the receiving side interface for receiving the cells transferred in the asynchronous transfer mode via the transmission path, and the cells received by the receiving means to the destination. Switch means to transfer to the route,
In an ATM device including a transmission side interface for transmitting a cell whose route is changed by a switch means to a transmission line connected to a transmission destination, monitoring information preset in a header part of the cell received by the reception side interface Is added and the monitoring information added to the cell to be sent to the transmission path connected to the destination at the transmission side interface is interpreted, without reducing the transmission efficiency or limiting the information source that can be monitored, There is an effect that the accuracy of misdelivery detection can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a control unit in FIG. 1;

3 is a block diagram showing a configuration of an R-side IF unit in FIG.

FIG. 4 is a diagram showing a configuration of a conversion table of a VPI conversion unit in FIG.

5 is a block diagram showing a configuration of an S-side IF unit in FIG.

FIG. 6 is a diagram showing a cell format according to an embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a control unit according to another embodiment of the present invention.

8 is a diagram showing a configuration of a reference table of a VP monitoring number sorting unit of FIG.

FIG. 9 is a block diagram showing a configuration of an S-side IF unit according to another embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a conventional example.

FIG. 11 is a diagram showing a cell format in a conventional example.

[Explanation of symbols]

1, 7 control unit 2-1 to 2-n reception side interface unit 3 switch unit 4-1 to 4-n transmission side interface unit 5-1 to 5-n, 6-1 to 6-n ATM terminal 11 virtual path Monitoring number determination unit 12 Virtual path monitoring number error display unit 20-1 to 20-n Receiving side virtual path monitoring unit 21-1 Virtual path monitoring number addition unit 22-1, 42-1 Old HEC byte detection counter unit 23-1 , 43-1 Clock unit 24-1 Reception unit 30 Virtual path identifier conversion unit 31 Cell switch unit 40-1 to 40-n, 45-1 Transmission side virtual path monitoring unit 41-1, 46-1 Virtual path monitoring number interpretation Section 44-1 transmission section 70 virtual path monitoring number sorting section

Claims (6)

[Claims] 1. A receiving side interface for receiving a cell transferred in an asynchronous transfer mode via a transmission line, a switch means for transferring the cell received by the receiving means to a path to a destination, and the switch. An ATM device including a transmission side interface for transmitting the cell whose route has been changed by means to a transmission line connected to the transmission destination, the ATM device being provided in the reception side interface and within a header portion of the received cell. And an interpreter that interprets the monitor information added to the cell that is provided in the transmission side interface and is sent to the transmission path connected to the destination. ATM device characterized by. 2. The adding means is configured to add the monitoring information to a setting position of the synchronization information in the header part of the cell used when receiving the cell at the receiving side interface, and the interpreting means. The ATM device according to claim 1, wherein the ATM information is configured to interpret the monitoring information extracted from the setting position of the synchronization information. 3. A receiving means for receiving a cell to which a virtual path identifier indicating at least a transmission source is added and which is transferred in an asynchronous transfer mode via a transmission line, and a destination to which the virtual path identifier added to the cell is transmitted. A conversion means for converting the virtual path identifier into a virtual path identifier, a switch means for transferring the cell whose virtual path identifier has been converted by the conversion means to the route to the destination, and a cell for which the path has been switched by the switch means. An AT including a transmission side interface for transmitting to a transmission line connected to the destination
M device, which is provided in the receiving side interface and is preset in correspondence with the virtual path identifier before being converted by the converting means in the header part storing the virtual path identifier of the received cell Adding means for adding information, taking-out means for taking out the monitoring information added to the cell provided in the transmission side interface and being sent to the transmission path connected to the destination, and the monitoring information taken out by the taking-out means And ATM monitoring means for comparing the virtual path identifier before being converted by the converting means and monitoring the misdelivery of the cell.
apparatus. 4. The adding means is configured to add the monitoring information to a setting position of the synchronization information in the header part of the cell used when receiving the cell at the receiving side interface, and the extracting means is provided. The configuration is such that the monitoring information is retrieved from the setting position of the synchronization information.
The ATM device described. 5. Receiving means for receiving a cell to which at least a virtual path identifier indicating a transmission source is assigned and which is transferred in an asynchronous transfer mode via a transmission line, and a destination of the virtual path identifier assigned to the cell. A conversion means for converting the virtual path identifier into a virtual path identifier, a switch means for transferring the cell whose virtual path identifier has been converted by the conversion means to the route to the destination, and a cell for which the path has been switched by the switch means. An AT including a transmission side interface for transmitting to a transmission line connected to the destination
M device, which is provided in the reception side interface, and which adds, to the header part for storing the virtual path identifier of the received cell, monitoring information preset in correspondence with the reception side interface, Extraction means for extracting the virtual path identifier and the monitoring information added to the cell to be transmitted to the transmission path connected to the transmission destination and provided in the transmission side interface, and a virtual path indicating the monitoring information and the transmission source Holding means for holding in advance the identifier and the virtual path identifier converted by the converting means; and reading from the holding means based on the virtual path identifier taken out by the taking out means and the monitoring information taken out by the taking out means, and Monitoring the misdelivery of the cell by comparing with the virtual path identifier converted by the converting means ATM apparatus characterized by having a visual means. 6. The adding means is configured to add the monitoring information to a setting position of the synchronization information in the header part of the cell used when receiving the cell at the receiving side interface, and the extracting means is provided. 6. The ATM device according to claim 5, wherein the virtual path identifier and the monitoring information are respectively extracted from the header portion.