JP2933001B2 - ATM equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ATM device,
In particular, ATM (Asynchronous Transf)
er Mode) The present invention relates to a cell error distribution monitoring method for monitoring cell error distribution in a device.

[0002]

2. Description of the Related Art Conventionally, as this type of cell mis-delivery monitoring system, information other than a header of each cell (payload portion) is used in order to transmit information having temporal continuity by ATM exchange.
In addition, there is a method in which an information source identifier indicating an information source and a sequence number of continuity information are added and transmitted, and the receiving side detects such information to detect cell loss and erroneous cell delivery.

That is, in the case of this method, as shown in FIG. 10, continuous information output from the ATM terminal 50 is divided into cells by a byte dividing unit 52 of a receiving unit 51, and an inserting circuit 54 inserts the cells into the cells. The sequence number supplied from the sequence number adding unit 53 is added.

Further, the supply information source identifier is inserted from the information source identifier adding unit 55 by the insertion circuit 56, the header information is added by the header information adding unit 57, and the cell is transmitted to the ATM switching system 58.

[0005] The ATM switching system 58 performs a switching operation using the header of the cell and transmits it to the receiving unit 59 on the other side. As described above, the transmission unit 51 sends the ATM switching system 5
As shown in FIG. 11, the cell transferred to the receiving unit 59 through the header 8 has a 4-byte sequence number and an information source identifier added to the head of the next payload of the 5-byte cell header.

[0006] Upon receiving the cell transmitted from the ATM switching system 58, the receiving section 59 receives 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.

[0007] Based on the information source identifier taken out by the take-out circuit 62, the mis-distributed cell detector 61 identifies whether or not the cell is erroneously delivered due to a bit error in the header. When the mis-delivered cell detection unit 61 detects a cell that has been mis-delivered, it switches the switch 63 and discards the cell.

[0008] The fetch circuit 64 fetches a sequence number from a cell in which erroneous delivery was not detected. Cell missing detector 6
5 detects the presence or absence of a missing cell based on the sequence number extracted by the extraction circuit 64. Upon detecting the occurrence of a cell loss, the cell loss detection unit 65 switches the switch 63 and puts the dummy information created by the dummy information creation unit 67 at the location where the cell loss has occurred.

[0009] FIFO (First In First)
Out) buffer 68 stores cells sequentially input through switch 63 from the top position,
The continuous information output from 0 is restored and output to the destination ATM terminal 69. The above-described cell error distribution monitoring method is described in detail in Japanese Patent Application Laid-Open No. Hei 3-139043.

[0010]

In the above-described conventional cell mis-delivery monitoring method, the receiving side compares the information source identifiers of the cells that are continuously received based on the information source identifiers of the cells that have been received first, and determines whether or not the cells are received. Since it is detected whether or not the cell was erroneously delivered, if the cell received first is erroneously delivered, there is a possibility that the normal cells received thereafter will be determined to be erroneously delivered. As a result, the accuracy of cell mis-distribution detection is reduced.

[0011] Further, since the information source identifier provided for monitoring cell mis-delivery is sent to the receiving side using the payload of the cell, the amount of information transmitted in the cell is reduced, and the transmission efficiency is reduced. .

Further, since the information source identifier provided for monitoring the cell mis-distribution is 4 bits, only 16 types of information sources (ATM terminals) can be identified, and the information for monitoring the cell mis-distribution can be identified. Sources are limited.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide an ATM device capable of improving the accuracy of cell mis-distribution detection without lowering the transmission efficiency or limiting the information sources that can be monitored. To provide.

[0014]

SUMMARY OF THE INVENTION A first AT according to the present invention
M device identifies at least the virtual path indicating the source
And transfer in asynchronous transfer mode via the transmission path.
Receiving means for receiving the transmitted cell;
A virtual indicating the destination of the given virtual path identifier
Conversion means for converting to a path identifier;
Route the cell whose virtual path identifier has been converted to the destination
Switch means for transferring to the
The cell whose route has been changed is transferred to the destination connected to the destination.
ATM device including transmission side interface for transmitting to transmission path
And provided at the receiving interface; and
To store the virtual path identifier of the received cell
Virtual before conversion by the conversion means
Adds monitoring information set in advance corresponding to the path identifier.
Additional means, and whether it is provided in the transmission side interface
Added to the cell transmitted to the transmission path connected to the destination
Extracting means for extracting the monitored information, and the extracting means
Monitoring information taken out in the above and before being converted by the converting means
Monitors the error of the cell by comparing with the virtual path identifier.
And monitoring means for viewing .

[0015]

[0016]

In the second ATM device according to the present invention, in the above-mentioned configuration, the adding means may be arranged such that the adding means is provided at a setting position of synchronization information in a header portion of the cell used when receiving the cell at the receiving interface. It is configured to add monitoring information, and the extracting unit is configured to extract the monitoring information from a setting position of the synchronization information.

A third ATM device according to the present invention comprises: receiving means for receiving a cell to which at least a virtual path identifier indicating a transmission source is given and which is transferred in an asynchronous transfer mode via a transmission path; Conversion means for converting the virtual path identifier to a virtual path identifier indicating the destination, switch means for transferring the cell whose virtual path identifier has been converted by the conversion means to a path to the destination, and the switch means An ATM device including a transmitting interface for transmitting a cell whose route has been changed to a transmission line connected to the transmission destination, wherein the ATM device is provided in the receiving interface and stores the virtual path identifier of the received cell. To add monitoring information set in advance in the header portion corresponding to the receiving side interface And a extracting means for extracting the virtual path identifier and the monitoring information added to a cell provided on the transmission-side interface and transmitted to a transmission path connected to the transmission destination, and extracting the monitoring information and the transmission source. Holding means for pre-holding the virtual path identifier shown and the virtual path identifier converted by the conversion means, and the holding means based on the virtual path identifier extracted by the extraction means and the monitoring information extracted by the extraction means. And a monitoring unit for comparing the virtual path identifiers read from the data and comparing the virtual path identifiers with the virtual path identifiers converted by the conversion unit, to monitor for an erroneous distribution of the cells.

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

[0020]

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

The monitoring of cell mis-distribution is based on the source virtual path identifier number of the virtual path identifier conversion unit and interprets the virtual path monitoring number of the cell arriving at the transmission interface unit as the virtual path monitoring number of the transmission virtual path monitoring unit. And the control unit.

This eliminates the possibility of erroneous detection of a normal cell received later in the state of a cell initially received as in the conventional system as a cell erroneous distribution, thereby improving the accuracy of cell erroneous distribution detection. Becomes possible.

In addition, the monitoring of the cell erroneous distribution is performed by monitoring the virtual path monitoring number of the cell arriving at the transmitting interface based on the receiving interface with the virtual path monitoring number interpreting unit and the control unit of the transmitting virtual path monitoring unit. I do. This eliminates erroneous detection of a normal cell received later in the state of the initially received cell as in the conventional method as a cell mis-distribution, thereby improving the accuracy of cell mis-distribution detection. Become.

Further, instead of the cell error distribution monitoring method using the cell payload portion as in the conventional method, the HEC (HEC) in the cell header which has become an unused area after the cell synchronization processing in the receiving section of the receiving interface section is performed. Header Er
(control) byte position is used for transmitting the virtual path monitoring number. As a result, a decrease in transmission efficiency can be prevented.

Further, since 8 bits are assigned to the virtual path monitoring number for the cell misplacement 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 increase the number of information sources (the number of ATM terminals) capable of monitoring cell mis-distribution as compared with the conventional case. 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.

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 transmission side.
The receiving side interface units (hereinafter, referred to as R side IF units) 2-1 to 2-n, the switch (SW) unit 3, and the receiving side ATM terminals 6-1 to 6- 6 respectively connected to 5-n. n (hereinafter referred to as S-side I
4-1 to 4-n).

Each of the R-side IF units 2-1 to 2-n is a receiving-side virtual path monitoring unit (hereinafter referred to as an R-side VP monitoring unit) 2.
0-1 to 20-n, and the R-side VP monitoring unit 20-n.
1 to 20-n become unused areas after performing synchronization processing of 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 each of the ATM terminals 5-1 to 5-n in the EC byte (0 to 0)
255) and add the cell to the output cell on the receiving side (hereinafter, referred to as the output cell).
(Referred to as an R-side output cell) 120-1 to 120-n.

At this time, each of the R-side IF units 2-1 to 2-n receives a receiving-side virtual path monitoring number notification signal (hereinafter referred to as an R-side VP monitoring number notification signal) 101-1 to 101-n.
Sends the VP monitoring number added to the HEC byte of the cell 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 converts the source VPI number in the header added to the cell sent from each of the R-side IF units 2-1 to 2-n into the routing destination VPI number and converts the VPI number to the routing destination VPI number.
Send to 1.

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

For example, when the cell from the ATM terminal 5-1 is A
When transmitting to the TM terminal 6-n, the cell switch unit 31 converts the cell from the transmission path connected to the ATM terminal 5-1 into an AT.
Routing for transmission 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 transmitted to the F unit 4-n.

Each of the S-side IF units 4-1 to 4-n is a transmission-side virtual path monitoring unit (hereinafter, referred to as an S-side VP monitoring unit) 4.
0-1 to 40-n, and the S-side VP monitoring unit 40-n.
1 to 40-n interpret the VP monitoring numbers added to the HEC bytes 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 a transmission-side virtual path monitoring number notification signal (hereinafter referred to as an S-side VP monitoring number notification signal) 103-1 to 103-n.
Thus, the interpretation results of the S-side VP monitoring units 40-1 to 40-n are sent to the control unit 1.

The control unit 1 determines the S specified by the S-side VP monitoring number notification signals 103-1 to 103-n to which the interpretation result has been 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, and it is checked 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 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, a control unit 1 is a virtual path monitoring number determination unit (hereinafter referred to as a VP monitoring number determination unit) 11
And a virtual path monitoring number error display section (hereinafter referred to as VP
And a monitoring number error display section) 12.

The VP monitoring number determination unit 11 is connected to the S-side IF unit 4-
S-side VP monitoring number notification signal 103-
VP monitoring number sent through 1-103-n
The S-side VP monitoring number notification signals 103-1 to 103-n
The source VP 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 number of the S-side IF units 4-1 to 4-n specified by
It is determined whether it matches the I number.

The VP monitor number determining unit 11 provides a virtual path monitor number error signal (hereinafter referred to as a VP monitor number error signal) 1 indicating that a cell mis-distribution has been detected when the determination results do not match.
11 is output to the VP monitor number error display unit 12. VP
The monitoring number error display section 12 displays the VP monitoring number error signal 1
When the number 11 is received, a VP monitor number error, that is, a cell mis-distribution detection is displayed.

FIG. 3 is a block diagram showing the configuration of the R-side IF unit 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)
And an old HEC byte detection counter unit 22-1 and a clock unit 23-1.

The receiving unit 24-1 performs synchronization processing of the cell using the HEC byte of the cell transmitted from the ATM terminal 5-1 and receives the input cell on the receiving side (hereinafter referred to as the R-side input cell) 121-. 1 to the VP monitoring number adding unit 21-1 of the R-side VP monitoring unit 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 unit 22-1.

Here, the H of the cell from the ATM terminal 5-1 is
The EC byte becomes an unused area by the synchronization process 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 for clearing the count value of the old HEC byte detection counter section 22-1 to zero.

Clock section 23 of R-side VP monitoring section 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 indication signal 124-1 from the clock unit 23-1 and detects the fifth byte from the head position of the cell (counter value = 5). The instruction signal 123-1 is output to the VP monitoring number adding unit 21-1.

Upon receiving the old HEC byte position indication signal 123-1 from the old HEC byte detection counter unit 22-1, the VP monitoring number addition unit 21-1 receives the old HEC byte position signal input at that time.
An R-side input cell 121-1 from the receiving unit 24-1 corresponding to the EC byte position has a VP set in advance corresponding to the VPI number of each of the ATM terminals 5-1 to 5-n, that is, in units of VPI numbers. A monitoring number (0-255) is added and its R
The side output cell 120-1 is sent to the switch unit 3.

At this time, the VP monitor number adding unit 21-1 outputs the R-side VP monitor number notification signal 10 including the VP monitor 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 same as that of the above-described R-side IF unit.
The configuration of the unit 2-1 is the same, and the operation of its components is also the same as the operation of the above-described R-side IF unit 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, the conversion table of the VPI conversion unit 30 includes the source HW numbers (# 1, # 1).
, # 4,...) And VPI number (VPI # 1, VPI
# 2, VPI # 1,...) Corresponding to each of the routing destination HW numbers (# 1, # 2, # 1,.
…) And VPI number (VPI # 10, VPI # 20, VPI
PI # 30,...) Are stored. The contents of the conversion table can be changed from outside.

FIG. 5 is a block diagram showing the configuration of the S-side IF unit 4-1 of 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 includes a virtual path monitoring number interpreting unit (hereinafter, referred to as VP). 41-1)
, An old HEC byte detection counter section 42-1 and a clock section 43-1.

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

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

Upon receiving the old HEC byte position indication signal 143-1 from the old HEC byte detection counter unit 42-1, the VP monitor number interpreting unit 41-1 receives the old HEC byte input signal at that time.
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
To 4-n are the same as those of the above-described S-side IF unit 4-1.
This is the same as the operation of -1.

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

The operation of the embodiment of the present invention will be described with reference to FIGS. First, the R-side IF unit 2-1 (HW number =
For # 1, VPI number = VPI # 1, the S-side IF unit 4-1 (HW number = # 1, VPI
No. = VPI # 10) is set, and the R side I
The case where the cell A is transmitted from the ATM terminal 5-1 connected to the F unit 2-1 will be described.

The cell A from the ATM terminal 5-1 is connected to the R side IF.
When sent to the unit 2-1, the R-side IF unit 2-1 assigns a VP monitor number (here, VPI # 1) corresponding to the VPI number (here, VPI # 1) to the cell A in the VP monitor number adding unit 21-1. ,
“1”), and the S-side IF unit 4
Transfer to -1. The VP monitoring number is the VPI conversion unit 30
Is fixed as long as the contents of the conversion table do not change.

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

In the VP monitor number determination unit 11 of the control unit 1,
The VP monitoring number (= “1”) notified by the side VP monitoring number notification signal 103-1 and the HW number of the S-side IF unit 4-1 specified by the S-side VP monitoring 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 with reference to the switch unit 3
Compare with the PI number (= "1").

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

Next, the conversion table of the VPI conversion unit 30 includes the R-side IF unit 2-3 (HW number = # 3, VPI
Number = VPI # 2), S
Side IF unit 4-2 (HW number = # 2, VPI number = VPI
The case where the cell B is transmitted from the ATM terminal 5-3 connected to the R-side IF unit 2-3 with # 20) set will be described.

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

At this time, the VP monitor number interpreting unit 41-2 (not shown) of the S-side IF unit 4-2 transmits the V
The P monitoring number (= "2") is interpreted, and the S-side VP monitoring number notification signal 103- including the VP monitoring number (= "2") is interpreted.
2 (not shown) is output to the control unit 1.

The VP monitor number determining unit 11 of the control unit 1
The VP monitoring number (= "2") notified by the side VP monitoring number notification signal 103-2 and the HW number of the S-side IF unit 4-2 specified by the S-side VP monitoring 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 with reference to the switch unit 3
Compare with the PI number (= "2").

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

FIG. 7 is a block diagram showing a configuration of a control unit according to another embodiment of the present invention. In the figure, a control unit 7 includes a VP monitor number determination unit 11, a VP monitor number error display unit 12, and a virtual path monitor number sort unit (hereinafter, VP monitor number sort unit).
And a monitoring number sorting unit) 70.
Note that the VP monitoring number determination 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.
Of the VP monitor number determination unit 11 and the VP monitor number error display unit 12, and the operation is also the same.

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

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

The VP monitor number determination unit 11 is connected to the S-side IF unit 4-
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
H-numbers of the S-side IF units 4-1 to 4-n specified by S-side 103-n and the S-side VP monitoring number notification signal 103-1
The VPI number of the routing destination from the VP monitoring number sorting unit 70 obtained through the VPI conversion unit communication signal 170 based on the VP monitoring number transmitted through
It is determined whether the W number matches.

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

FIG. 8 is a diagram showing the configuration of the reference table of the VP monitoring number sorting section 70 of FIG. In the figure, VP
The reference table of the monitoring number sorting unit 70 stores the source HW number (# 1, # 1) corresponding to the VP monitoring number (1 to 256).
# 3, # 4,...) And VPI numbers (VPI # 1, VP
I # 2, VPI # 1,...), A preset routing destination HW number (# 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 change of the contents of the conversion table of the VPI conversion unit 30.

For example, the VP monitoring number is set to 1 as described above.
When 256 is set, the VP monitoring number sorting unit 70
VP monitoring number adding unit 21 of each of the side IF units 2-1 to 2-n
−1 to 21-n, the R-side VP including these VP monitoring numbers
It outputs monitoring number notification signals 101-1 to 101-n.

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

The switch unit 3 includes R-side IF units 2-1 to 2-n
The routing is performed for the cells from each of the S-side IF units 4-1 to 4-1 as the S-side input cells 130-1 to 130-n.
4-n.

In the S-side IF sections 4-1 to 4-n, the VP monitoring number interpreting sections 41-1 to 41-n (the VP monitoring number interpreting section 41)
-2-41-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-
It outputs S side VP monitoring number notification signals 103-1 to 103-n including the VPI number in the cell header of n to the VP monitoring number determination unit 11 of the control unit 1.

The VP monitoring number determination unit 11 determines the VPI number and the S-side VP monitoring number notification signals 103-1 to 103- included in the S-side VP monitoring number notification signals 103-1 to 103-n.
HW to which the S-side IF units 4-1 to 4-n specified by n belong
Number and a VP monitoring number sorting unit 70 based on the VP monitoring number.
Routing VP read from the lookup table of
It is determined whether the I number and the HW number match each other.

The VP monitor number judging section 11 outputs a VP monitor number error signal 111 to the VP monitor number error display section 12 indicating that the cell is incorrectly distributed, when the judgment results do not match. V
Upon receiving the VP monitor number error signal 111, the P monitor number error display unit 12 displays a VP monitor number error, that is, a cell mis-distribution detection.

FIG. 9 shows an S-side IF according to another embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration of a unit. 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 4-1.
2-1 and a clock section 43-1.

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

Clock section 43 of S-side VP monitoring section 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 section 42-1 counts the byte position indication signal 144-1 from the clock section 43-1 and detects the fifth byte from the head 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 monitor number interpreting section 46-1 includes the transmitting section 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 a register (not shown).

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

The VP monitor number interpreter 46-1 outputs the S-side VP monitor number notification signal 103-1 including the VPI number and the VP monitor number in the cell header held in the register to the controller 1.
Output to

Although not shown, the S-side IF unit 4-2
To 4-n are the same as those of the above-described S-side IF unit 4-1.
This is the same as the operation of -1.

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

Cell A from ATM terminal 5-1 is connected to R-side IF
When transmitted to the unit 2-1, the R-side IF unit 2-1 assigns a VP monitoring number (here, “1”) corresponding to the R-side IF unit 2-1 to the cell A in the VP monitoring number adding unit 21-1. “)”, And transfers the result 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 section 46-1 of the S-side IF section 4-1 interprets the VP monitor number (= "1") added to the cell A and outputs the VPI in the cell header of the cell A.
S including the ID number and the VP monitoring number (= “1”) of the interpretation result
It outputs the side VP monitoring number notification signal 103-1 to the control unit 7.

The VP monitor number determination unit 11 of the control unit 7
The 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
The routing obtained from the reference table of the VP monitoring number sort unit 70 based on the HW number (= # 1) to which the VP belongs and the VP monitoring number (= "1") included in the S-side VP monitoring number notification signal 103-1. It is determined whether the previous VPI number (= VPI # 10) and the HW number (= # 1) match.

If the determination results match, the VP monitor number determination unit 11 determines that the cell has been delivered normally.
If the VP monitor number determination unit 11 does not agree with the determination result, the VP monitor number error signal 111 indicating the erroneous cell distribution detection is output to the VP monitor number error display unit 12 if the cell is incorrectly delivered. To display cell mis-distribution detection.

Next, the conversion table of the VPI conversion unit 30 includes the transmission side R-side IF unit 2-3 (HW number = # 3, VPI
Number = VPI # 2), S
Side IF unit 4-2 (HW number = # 2, VPI number = VPI
The case where the cell B is transmitted from the ATM terminal 5-3 connected to the R-side IF unit 2-3 with # 20) set will be described.

Cell B from ATM terminal 5-3 is connected to R-side IF
When sent to the unit 2-3, the R-side IF unit 2-3 assigns a VP monitoring number (here, “2”) corresponding to the R-side IF unit 2-3 to the cell B in the VP monitoring number adding unit 21-3. “)”, And transfers the result to the S-side IF unit 4-2 via the switch unit 3.

At this time, the VP monitor number interpreting section 41-2 of the S-side IF section 4-2 interprets the VP monitor number (= “2”) added to the cell B, and the VP monitor number (= “2”). ”)
And the VPI number in the cell header of cell B (= VPI # 2
0) is output to the control unit 7.

The VP monitor number determining unit 11 of the control unit 7
The 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.
Of the VP monitoring number sorting unit 70 based on the HW number (= # 2) to which the VP belongs and the VP monitoring number (= "2") included in the S-side VP monitoring number notification signal 103-2. It is determined whether the previous VPI number (= VPI # 20) and the HW number (= # 2) match.

If the determination results match, the VP monitoring number determination unit 11 determines that the cell has been delivered normally.
If the VP monitor number determination unit 11 does not agree with the determination result, the VP monitor number error signal 111 indicating the erroneous cell distribution detection is output to the VP monitor number error display unit 12 if the cell is incorrectly delivered. To display cell mis-distribution detection.

In the cell mis-delivery monitoring method according to the above-described embodiment of the present invention and another embodiment, the monitoring of cell mis-delivery is performed based on the VPI number of the transmission source of the VPI conversion unit 30 based on the S-IF unit 4-1.
Since the VP monitoring numbers of the cells arriving at .about.4-n are monitored, a normal cell received thereafter is erroneously detected as a cell mis-distribution in the state of the cell received first as in the conventional method. There is nothing. For this reason, it is possible to monitor cell mis-distribution with high accuracy.

The cell error monitoring method according to one embodiment and another embodiment of the present invention is not a cell error monitoring method using a cell payload portion as in the conventional method, but is not performed after cell synchronization processing. Since the system uses the HEC byte used as the use area, the transmission efficiency is higher than that of the conventional system.

Further, the cell error monitoring system according to one embodiment and another embodiment of the present invention uses an 8-bit old HEC byte for cell error monitoring monitoring control, and therefore is 16 times smaller than the conventional system. Twice 256 types of information sources (ATM terminals) can be identified.

As described above, the monitoring of the cell erroneous distribution is performed based on the transmission source VPI number of the VPI conversion unit 30 as a reference.
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).
n is not shown) VP monitor number interpreting units 41-1 to 41-
n (the VP monitor number interpreting units 41-2 to 41-n are not shown) and the control unit 1 monitors the normal received cells in the state of the initially received cells as in the conventional method. Is not erroneously detected as a cell erroneous distribution, so that the accuracy of cell erroneous distribution detection can be improved.

The monitoring of cell mis-distribution is performed by the R-side IF unit 2-1.
VP monitoring numbers of the cells arriving at the S-side IF units 4-1 to 4-n based on .about.2-n.
n (the S-side VP monitoring units 45-2 to 45-n are not shown) and the VP monitoring number interpretation units 46-1 to 46-n (the VP monitoring number interpretation units 46-2 to 46-n are not shown). And monitoring by the control unit 7, it is possible to prevent false detection of a normal cell received later in the state of a cell initially received as in the conventional method, as a cell mis-distribution. Can be improved.

Further, instead of the cell mis-delivery monitoring system using the cell payload portion as in the conventional system, the R-side IF
The HEC byte in the cell header which has become an unused area after the cell synchronization processing in the receiving units 24-1 to 24-n of the units 2-1 to 2-n (the receiving units 24-2 to 24-n are not shown). Is used for transmitting the VP monitoring number, it is possible to prevent a decrease in transmission efficiency.

Furthermore, since 8 bits are assigned to the VP number for the cell mis-delivery 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 method. , Information source (AT
M terminals) can be improved as compared with the conventional case.

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

[0098]

As described above, according to the present invention, a receiving interface for receiving a cell transferred in an asynchronous transfer mode via a transmission path, and a cell received by a receiving means to a destination. Switch means for transferring to a route;
In a ATM device including a transmission interface for transmitting a cell whose path has been rerouted by the switch means to a transmission path connected to a transmission destination, monitoring information preset in a header portion of the cell received by the reception interface. By interpreting the monitoring information added to the cell transmitted to the transmission path connected to the transmission destination at the transmission-side interface, the cell can be transmitted without lowering the transmission efficiency or limiting the information sources that can be monitored. There is an effect that the accuracy of erroneous delivery detection can be improved.

[Brief description of the 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;

FIG. 3 is a block diagram illustrating a configuration of an R-side IF unit in FIG. 1;

FIG. 4 is a diagram illustrating a configuration of a conversion table of a VPI conversion unit in FIG. 1;

FIG. 5 is a block diagram illustrating a configuration of an S-side IF unit in FIG. 1;

FIG. 6 is a diagram showing a cell format in one embodiment of the present invention.

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

FIG. 8 is a diagram showing a configuration of a reference table of a VP monitoring number sorting unit in FIG. 7;

FIG. 9 is a block diagram illustrating 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 adding unit 22-1, 42-1 Old HEC byte detection counter unit 23-1 , 43-1 Clock section 24-1 Receiving section 30 Virtual path identifier conversion section 31 Cell switch section 40-1 to 40-n, 45-1 Transmission side virtual path monitoring section 41-1, 46-1 Interpretation of virtual path monitoring number Unit 44-1 transmission unit 70 virtual path monitoring number sorting unit

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) H04L 12/28 H04L 12/24 H04L 12/26

Claims (4)

(57) [Claims] 1. A virtual path indicating at least a transmission source
Asynchronous transfer mode with an identifier added and via the transmission path
Receiving means for receiving cells transferred by
Bar indicating the destination of the virtual path identifier assigned to
Conversion means for converting to a Challpath identifier, and said conversion means
The cell whose virtual path identifier has been converted by
A switch means for transferring to a route, and the switch means
The cell whose route has been replaced is connected to the destination.
AT including transmission interface for sending to a transmission line
M device, provided in the receiving interface
And stores the virtual path identifier of the received cell.
Birch before conversion by the conversion means in the header portion
Monitoring information set in advance corresponding to the
Adding means for adding,
Cell transmitted to the transmission path connected to the destination
Extracting means for extracting the added monitoring information;
The monitoring information extracted by the means and converted by the conversion means
Mis-distribution of the cell by comparing with the previous virtual path identifier
ATM having monitoring means for monitoring the traffic
apparatus. 2. The method according to claim 1, wherein the adding means includes a receiving interface.
Of the cell used to receive the cell in the source
The monitoring information is added to the setting position of the synchronization information in the header.
The synchronization means is configured to add the monitoring information from a set position of the synchronization information.
2. A structure for extracting visual information.
The ATM device as described. 3. A virtual path indicating at least a transmission source.
Asynchronous transfer mode with an identifier added and via the transmission path
Receiving means for receiving cells transferred by
Bar indicating the destination of the virtual path identifier assigned to
Conversion means for converting to a Challpath identifier, and said conversion means
The cell whose virtual path identifier has been converted by
A switch means for transferring to a route, and the switch means
The cell whose route has been replaced is connected to the destination.
AT including transmission interface for sending to a transmission line
M device, provided in the receiving interface
And stores the virtual path identifier of the received cell.
In the header part corresponding to the receiving interface
Adding means for adding predetermined monitoring information, the transmission
Provided on the receiving interface and connected to the destination
Virtual added to a cell to be transmitted to the selected transmission path.
Extracting means for extracting a path identifier and the monitoring information;
Monitoring information and a virtual path identifier indicating the transmission source;
The virtual path identifier converted by the conversion means is predicted.
Holding means for holding the
Monitoring and retrieval taken by the retrieval means
Reading from said holding means based on the information and said converting means
The cell is compared with the converted virtual path identifier.
Monitoring means for monitoring mis-delivery of
ATM equipment. 4. The receiving device according to claim 1, wherein the adding unit includes :
Of the cell used to receive the cell in the source
The monitoring information is added to the setting position of the synchronization information in the header.
And the take- out means, respectively, from within the header portion,
Configured to retrieve a Chall pass identifier and the monitoring information.
The ATM device according to claim 3, wherein: