JP3135700B2 - Policing mechanism failure detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a policing mechanism failure detecting apparatus for detecting the occurrence of a failure in a policing mechanism provided in an ATM communication apparatus.

The ATM (Asynchronous Transfer Mode) technology, which is the core technology of B-ISDN (Broadband-ISDN), has means for constantly monitoring network traffic and preventing abnormal rise of traffic due to intentional or failure. ing. This is policing or UPC (User Par
ameter Control), which counts the number of cells (a type of fixed-length packet) flowing into the network from the subscriber, and checks whether the flow rate has exceeded the amount previously declared for each virtual path (VP / Virtual Path). Is checked, and a cell having a violating VP is subjected to measures such as cell discarding and addition of a violation tag.

[0003] From now on, the ATM technique requires a policing mechanism failure detecting device for detecting whether or not the policing mechanism is operating normally.

[0004]

2. Description of the Related Art B-ISDN is the foundation of next-generation communication that integrates all media such as voice, image, data, and the like. From now on, high reliability is required. For this reason, inside the communication device, a redundant configuration may be adopted,
A monitoring cell is flowed inside to ensure that cell transmission can always be performed error-free.

However, there is no means for monitoring the policing mechanism at this time.

[0006]

If the policing mechanism fails, it cannot be checked even if the flow rate of a certain virtual path increases due to some runaway, resulting in an abnormal increase in traffic and consequently another normal path. This causes adverse effects such as cell discard of the virtual path. From now on, a device for monitoring whether the policing mechanism is operating normally has been called for.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a policing mechanism failure detecting apparatus for detecting occurrence of a failure in a policing mechanism provided in an ATM communication apparatus.

[0008]

FIG . 1 relates to the present invention.
FIG. 2 and FIG. 3 show the principle structure of the present invention. In these figures, reference numeral 1 denotes a policing mechanism provided in the ATM communication apparatus for detecting whether or not an incoming cell exceeds a declared value by using a given policing parameter; Prepared for
An excess cell processing circuit 3 for performing discard processing for excess cells, etc., is a policing mechanism failure detection device of the present invention that implements the failure detection processing of the policing mechanism 1.

[0009] The policy <br/> ring mechanism failure detecting device 3 of the invention relating to the onset bright shown in Figure 1, the insertion portion 4a, the detection unit 5a
, An instruction unit 6, a setting unit 7, a post-processing unit 8, and a buffering unit 9. Here, the instruction unit 4a and the setting unit 7
May not be provided for both, but preferably one of them is provided.

The input section 4a inputs a function monitoring cell having an unused virtual path to the policing mechanism 1. The detection unit 5a detects occurrence of a failure in the policing mechanism 1. The instruction unit 6 instructs the input unit 4a to variably change the input amount of the function monitoring cell. The setting unit 7 variably sets a policing parameter for the function monitoring cell in the policing mechanism 1. The post-processing unit 8 performs processing so that the function monitoring cell flowing out of the policing mechanism 1 does not affect the following. The buffering unit 9 buffers the lower-priority cell of either the function monitoring cell or the user cell, so that the other higher-priority cell has priority over the policing mechanism 1. Process to be input to.

The policing mechanism failure detecting device 3 of the present invention shown in FIG. 2 includes a detecting unit 5b, a changing unit 10, and a control unit 11.
b. The detection unit 5b detects occurrence of a failure in the polishing mechanism 1. The change unit 10 includes the policing mechanism 1
Are fixedly or variably changed in all or a part of the policing parameters indicated for. The control unit 11b controls the user cell determined to be an excess cell according to the change processing of the change unit 10 so that the processing of the excess cell processing circuit 2 is not performed.

The policing mechanism failure detecting device 3 of the present invention shown in FIG. 3 includes an input unit 4c, a detecting unit 5c, and a post-processing unit 8.
, A buffering unit 9 and a control unit 11c.
The input unit 4c inputs a fixed or variable amount of function monitoring cells having a virtual path in use to the policing mechanism 1.
The detection unit 5c detects occurrence of a failure in the policing mechanism 1. The post-processing unit 8 performs processing so that the function monitoring cell flowing out of the policing mechanism 1 does not affect the following. The buffering unit 9 buffers the lower-priority cell of either the function monitoring cell or the user cell, so that the other higher-priority cell has priority over the policing mechanism 1. Process to be input to. The control unit 11c controls such that the processing of the excess cell processing circuit 2 is not performed on user cells determined to be excessive cells according to the input processing of the input unit 4c.

[0013]

Before explaining the operation of the present invention, FIG.
[Function] of the invention related to the present invention will be described.
In the invention relating to the onset bright shown in FIG. 1, the input unit 4a,
A function monitoring cell having an unused virtual path is input to the policing mechanism 1. At this time, when the instruction unit 6 is not provided, the input unit 4a inputs a fixed amount of function monitoring cells, and when the instruction unit 6 is provided, the input amount is changed stepwise, for example, according to the instruction. The function monitoring cell is turned on in the mode.

On the other hand, when the input section 4a inputs a fixed amount of function monitoring cells, the setting section 7 preferably sets the policing parameters for the function monitoring cells while changing them, for example, in a stepwise manner. When 4a introduces a variable amount of function monitoring cells, preferably, a policing parameter for a function monitoring cell indicating a fixed value is set.

When a function monitoring cell having an unused virtual path is input to the policing mechanism 1, the detecting unit 5a
What output value is output if the policing mechanism 1 is normal, based on the input amount of the function monitoring cell input by the input unit 4a and the policing parameter for the function monitoring cell set by the setting unit 7 It is possible to evaluate whether the polishing mechanism 1 is normal or not by comparing this evaluation value with the output value actually output from the polishing mechanism 1 and determine whether the detection result is normal or not. Output.

[0016] In this way, relevant to the present onset Akira shown in Figure 1
According to the present invention, the occurrence of a failure in the polishing mechanism 1 can be detected. In this detection process, when a user cell is prioritized, a buffering unit 9 is provided on the function monitoring cell side. Due to the buffering unit 9, the function monitoring cell to be input by the input unit 4a is not input to the polishing mechanism 1 as it is. From now on, when the buffering unit 9 is provided on the function monitoring cell side, the means for detecting the flow rate of the user cell, the buffering unit 9
Is provided, and the detecting unit 5a evaluates the output value of the policing mechanism 1 while considering the detection values of these means,
It is preferable to detect whether or not the polishing mechanism 1 is normal.

In the present invention shown in FIG. 2, the changing unit 10 changes all or a part of the policing parameters set in the policing mechanism 1 from the host system in a fixed or variable manner.

When the policing parameter is changed, the detecting unit 5b determines from the policing parameter changed by the changing unit 10 that the policing mechanism 1 is normal.
Since it is possible to guess what output value is output, by comparing this guessed value with the output value actually output by the policing mechanism 1, it is determined whether or not the policing mechanism 1 is normal. And outputs the detection result. At this time, the control unit 11b controls the excess cell processing circuit 2 so that a user cell determined to be an excess cell according to the policing parameter changed by the change unit 10 is not subjected to the processing for the excess cell.

As described above, according to the present invention shown in FIG. 2, it is possible to detect the occurrence of a failure in the policing mechanism 1 without using a cell for detection such as a function monitoring cell.

In the present invention shown in FIG. 3, the input unit 4c inputs a fixed or variable amount of function monitoring cells having a virtual path in use to the policing mechanism 1. When a function monitoring cell having a used virtual path is input to the policing mechanism 1, the detecting unit 5c determines from the input amount of the function monitoring cell input by the input unit 4c that the policing mechanism 1 is normal. ,
Since it is possible to guess what output value is output, by comparing this guessed value with the output value actually output by the policing mechanism 1, it is determined whether or not the policing mechanism 1 is normal. And outputs the detection result. At this time, the control unit 11c controls the excess cell processing circuit 2 so that the user cell determined to be an excess cell by the function monitoring cell input by the input unit 4c is not processed for the excess cell.

In this way, according to the present invention shown in FIG. 3, it is possible to detect the occurrence of a failure in the polishing mechanism 1. In this detection process, when a user cell is prioritized, a buffering unit 9 is provided on the function monitoring cell side. For this buffering unit 9, the input unit 4
The function monitoring cell input by c is not input to the polishing mechanism 1 as it is. From now on, when the buffering unit 9 is provided on the function monitoring cell side, means for detecting the flow rate of the user cell and means for detecting the actual input amount of the monitoring function cell output from the buffering unit 9 are provided. 5
It is preferable that c evaluates the output value of the polishing mechanism 1 in consideration of the detection values of these means, thereby detecting whether or not the polishing mechanism 1 is normal.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. Before describing the embodiment, an example of the polishing mechanism 1 described with reference to FIG. 1 will be described.

FIG. 4 shows a polishing mechanism 1 according to the TX method.
Is illustrated. The TX method measures the number of cells arriving during a specified period T and obtains _a measured value X _{a of} this cell.
And a comparison of the reported value X with the reported value X to detect whether or not the cell flow rate is excessive.

That is, the cell information separation section 20 separates the header information of the incoming cell, supplies the header information to the VPI filter 23 and the cell timing extraction section 25, and outputs the cell data to the delay section 21. Upon receiving this header information, the VPI filter 23
On the other hand, if the received header information has the assigned virtual path number (VPI), “1” is output, and if it has any other VPI, “0” is output. In response to the output processing of the VPI filter 23, the counter 24
Counts up the count value every time a cell having the assigned VPI flows in.

On the other hand, the cell timing extracting section 25 extracts a cell head pulse from the received header information and outputs it to the counter 26.
Using the time T of the time parameter held in 7 as the initial value of the count value, the count value is counted down every time this cell head pulse is received. When the count value reaches “0”, a reset pulse is output to the counter 24, and the time T is loaded as an initial value.

As described above, the counter 26 measures the time and outputs a reset pulse to the counter 24 every time the time T elapses. Upon receiving the reset pulse, the counter 24 counts the time T. The number of cells arriving in between is measured. In response to the measurement process of the counter 24, comparing unit 28, the measured values X _a counter 24, compares the magnitude between the reported value X held in the parameter holding unit 27, the measured values X _a is declared value X In the case of exceeding, the cell flow rate excess is notified to the cell control unit 22, and in response to the notification, the cell control unit 22 executes a process of discarding the cell data delayed by the delay unit 21.

As described above, when the policing mechanism 1 receives the time T serving as a policing parameter and the cell report value X, the policing mechanism 1 uses the policing parameter to determine whether or not the incoming cell flow rate exceeds the report value. Is processed for each virtual path.

Policing mechanism failure detecting device 3 of the present invention
Exerts a function of detecting occurrence of a failure in the polishing mechanism 1. FIG. 5 shows a policy having a configuration related to the present invention .
FIG. 2 illustrates a switching mechanism failure detection device 3 . Here, 1 in the figure
“a” is a polishing circuit according to the circuit configuration shown in FIG.

The policing mechanism failure detecting device 3 having the configuration shown in FIG. 5 employs a configuration for detecting a failure of the policing circuit 1a using an unused virtual path, and includes a device control unit 30 and a function monitoring unit. Unit 31 and function monitoring cell generator 3
2, a multiplexer 33, and a post-processing unit 34.

The device control unit 30 includes a polishing circuit 1
Instruct policing parameters for each virtual path to a, and control the overall processing of the apparatus. The function monitoring unit 31 detects occurrence of a failure in the policing circuit 1a by instructing generation of a function monitoring cell having an unused virtual path. The function monitoring cell generation unit 32 generates a function monitoring cell according to the generation parameter specified by the function monitoring unit 31. The multiplexer 33 inputs one of the function monitoring cell generated by the function monitoring cell generator 32 and the incoming user cell to the policing circuit 1a. The post-processing unit 34 controls the function monitoring cell flowing out of the policing circuit 1a so as not to affect the following.

FIG. 6 shows a detailed circuit configuration example of the function monitoring cell generator 32. Function monitoring cell generator 32
As shown in FIG. 6, when the generation parameters indicating the time T and the number of cells X are sent from the function monitoring unit 31,
The generated parameters are stored in the X register 40 and the T register 41.
The interval calculation unit 42 calculates the generation time interval of the function monitoring cell using the latch data, and the timing generation unit 43 generates a timing pulse according to the calculation result. Then, the header information creation unit 44 creates a function monitoring cell using the virtual path information on the function monitoring cell sent from the function monitoring unit 31, and the cell generation unit 45 generates the function monitoring cell at the timing generated by the timing generation unit 43. The function monitoring cell created by the header information creation unit 44 is output to the multiplexer 33 according to the pulse.

Thus, the function monitoring cell generator 32
As shown in FIG. 7, function monitoring cells of the indicated flow rate are generated in accordance with the generation parameters specified by the function monitoring unit 31.

When the function monitoring unit 31 executes the failure detection of the policing circuit 1a, first, the policing parameter for the function monitoring cell set for the policing circuit 1a by the device control unit 30 is transmitted to the policing circuit 1a. The flow rate at which the function monitoring cell to be input receives a determination that the flow rate does not become excessive is determined. Then, a generation parameter for realizing the flow generation is specified, and the function monitoring cell generation unit 32
, A function monitoring cell of the flow rate is generated and supplied to the policing circuit 1a. And
In response to the input of the function monitoring cell, the policing circuit 1a
Collects the output of whether or not the flow rate is excessive to the function monitoring cell. If the flow rate is excessive, the policing circuit 1a is out of order. .

Next, the device control unit 30 controls the polishing circuit 1
Based on the policing parameter for the function monitoring cell set for a, the flow rate at which the function monitoring cell to be put into the policing circuit 1a is determined to have an excessive flow rate is determined. Then, by specifying generation parameters for realizing the flow rate generation and notifying the function monitoring cell generation unit 32,
A function monitoring cell of the flow rate is generated and supplied to the polishing circuit 1a. Then, in response to the input of the function monitoring cell, it is collected that the policing circuit 1a outputs whether the flow rate is excessive or not to the function monitoring cell,
When the output is not excessive, the policing circuit 1a
Since a failure has occurred, a message to that effect is output.

As described above, the policing mechanism failure detecting device 3 having the configuration shown in FIG. 5 inputs a function monitoring cell having an unused virtual path to the policing circuit 1a and, in accordance with the judgment result of the policing circuit 1a for the input. The processing is performed so as to detect occurrence of a failure in the polishing circuit 1a.

The post-processing unit 34 shown in the configuration of Figure 5, the
It can also be used in the polishing mechanism failure detection device 3 of the invention.
This is to control the function monitoring cell flowing out of the policing circuit 1a so as not to affect the following. FIG.
9A and 9B show two embodiments of the post-processing unit 34. FIG. The embodiment shown in FIG. 8 employs a configuration in which the selector 340 is used to output “0” when the function monitoring cell flows subsequently, thereby displaying the subsequent information. That is, when a control line for transmitting the valid / invalid information of the cell is provided, "0" is output to the control line, or a flag for indicating valid / invalid is provided in the header of the function monitoring cell. If so, the flag is output as "0" to indicate that the cell is a function monitoring cell, and processing is performed so as not to affect subsequent cells.

On the other hand, the embodiment shown in FIG.
When the function monitoring cell flows out of the policing circuit 1a by using the demultiplexer 341, the function monitoring cell is sent to the function monitoring unit 31 so that the function monitoring cell does not flow out, so that the function monitoring cell is not affected. Process it. When adopting this configuration, if the function monitoring cell generating unit 32 assigns a sequence number to the function monitoring cell, the function monitoring unit 31 can know the number of the function monitoring cell discarded. Therefore, the behavior of the polishing circuit 1a can be more finely checked.

In the configuration shown in FIG. 5, it is not specified which of the user cell and the function monitoring cell has priority. When the function monitoring cell is prioritized, it is necessary to provide the FIFO 35 on the user cell side preceding the multiplexer 33 as shown in FIG. On the other hand, when priority is given to the user cell side, it is necessary to provide this FIFO 35 on the function monitoring cell side.

When adopting the configuration in which the FIFO 35 is provided on the user cell side, the function monitoring cell is given priority and is supplied to the policing circuit 1a.
Is supplied to the policing circuit 1a. Therefore, the function monitoring unit 31 can accurately detect the occurrence of a failure in the policing circuit 1a. On the contrary,
When the FIFO 35 is provided on the function monitoring cell side, the user cell is preferentially supplied to the policing circuit 1a. Therefore, the function monitoring cell of the flow rate designated by the function monitoring unit 31 is supplied to the policing circuit 1a. Not exclusively. Therefore, the function monitoring unit 31 may not be able to accurately detect the occurrence of a failure in the policing circuit 1a.

From now on, the FIFO 35 is added to the function monitoring cell side.
Is provided, as shown in FIG. 10 (b), a configuration is adopted in which a flow rate measuring unit 36 for measuring the flow rate of the user cell is provided. The rate at which the monitoring function cell requested by the user is input to the policing circuit 1a is evaluated, and processing is performed so as to detect the occurrence of a failure in the policing circuit 1a according to the evaluation. Alternatively, when the multiplexer 33 selects a function monitoring cell as shown in FIG. 10C instead of the flow rate measurement unit 36, the function monitoring unit 31 is notified of the selection, and the function monitoring cell is notified. The function monitoring unit 31 is configured to notify the function monitoring unit 31 of the actual input amount of the policing circuit 1a and detect the occurrence of a failure in the policing circuit 1a according to the actual flow rate of the function monitoring cell.

[0041] Figure 11 illustrates a Kazumi施例of the present invention.
The configuration shown in FIG. 5 employs a configuration in which the function monitoring unit 31 inputs a function monitoring cell to the polishing circuit 1a, thereby adopting a configuration for detecting occurrence of a failure in the polishing circuit 1a. In the embodiment, the function monitoring unit 31 changes the policing parameter of the function monitoring cell to detect a failure of the policing circuit 1a.

That is, the function monitoring unit 3 of the embodiment shown in FIG.
1 adopts a configuration in which the device control unit 30 takes in a policing parameter set for the policing circuit 1a, and includes a management unit 310 and a selector 311. When the management unit 310 is set in the policing circuit 1a, a policing parameter for determining a function monitoring cell having a fixed flow rate generated by the function monitoring cell generation unit 32 as an excessive flow rate and a policing parameter for determining a non-excessive flow rate It manages two types of policing parameters called policing parameters. The selector 311 selects the policing parameter managed by the management unit 311 for the policing parameter for the function monitoring cell from among the policing parameters fetched from the device control unit 30, and selects the policing parameter managed by the management unit 311 from the device control unit 30. The captured polishing parameters are selected as they are and output to the polishing circuit 1a.

According to this configuration, when the function monitoring unit 31 of the embodiment of FIG. 11 executes the failure detection of the policing circuit 1a, first, the flow rate excess among the two types of policing parameters managed by the management unit 310 The polishing circuit 1 selects a type of polishing parameter to be determined
Set to a. Then, by instructing the function monitoring cell generator 32 to generate a function monitoring cell with a fixed flow rate,
The function monitoring cell of the flow rate is generated and the polishing circuit 1
a. In response to the input of the function monitoring cell, the policing circuit 1a collects information indicating whether the flow rate is excessive or not to the function monitoring cell. Since a failure has occurred in the circuit 1a, the fact is output.

Next, of the two types of polishing parameters managed by the management unit 311, a type of polishing parameter determined to be non-excessive is selected and set in the polishing circuit 1 a. Then, for the function monitoring cell generator 32,
By instructing the generation of a function monitoring cell having a fixed flow rate, a function monitoring cell having the flow rate is generated and supplied to the policing circuit 1a. In response to the input of the function monitoring cell, the policing circuit 1a collects information indicating whether the flow rate of the function monitoring cell is excessive or not. Since a failure has occurred in 1a, the fact is output.

As described above, the policing mechanism failure detecting device 3 of the embodiment shown in FIG. 11 also inputs the function monitoring cell having the unused virtual path to the polishing circuit 1a, and the judgment result of the policing circuit 1a with respect to the input. In accordance with the above, processing is performed to detect the occurrence of a failure in the polishing circuit 1a.

The actual施例shown in FIG. 11 uses the virtual path unused, so to speak offline policing circuit 1a
1 is an embodiment of the present invention having a configuration for detecting occurrence of a failure in a power supply. On the other hand, in the present invention, it is also possible to adopt a configuration in which the occurrence of a failure in the policing circuit 1a is detected online, using a user cell.

FIG. 12 shows an embodiment of this online configuration. The function monitoring unit 31 in FIG. 12 adopts a configuration in which the device control unit 30 takes in a policing parameter set for the policing circuit 1a, and the management unit 31
2, the selector 313 and preferably the policing circuit 1
and a mask portion 37 that is developed in the area a. Where 5
Numeral 0 denotes a violation judging circuit provided in the policing circuit 1a, which judges an excessive user cell and generates a discard instruction signal. In this case, the user cell is discarded.

The management section 312 is provided with a policing circuit 1a.
When it is set to, for example, the policing parameter for determining that the user cells flowing through the policing circuit 1a are in an excessive flow rate is managed. Here, it is preferable that the policing parameter is prepared for each virtual path. The selector 313 selects a policing parameter managed by the management unit 312 for the policing parameter indicated by the designated virtual path from among the policing parameters fetched from the device control unit 30, and selects the policing parameter managed by the management unit 312 for the other policing parameters. Is selected as it is and output to the polishing circuit 1a. The mask unit 37 includes a discard control unit 51 applied to a user cell having a virtual path selected by the selector 313.
Masks the execution of the discarding process.

According to this configuration, when detecting the failure of the policing circuit 1a, the function monitoring unit 31 of the embodiment of FIG. 12 selects a policing parameter managed by the management unit 312 and sets it in the policing circuit 1a. In response to the change of the policing parameter, it is collected whether the policing circuit 1a outputs whether the flow rate is excessive or not. If the output is not the excess flow rate, a failure occurs in the policing circuit 1a. Output to that effect. At this time, the user cell having the virtual path used for the failure detection is not discarded according to the processing of the mask unit 37.

In this manner, the policing mechanism failure detecting device 3 of the embodiment shown in FIG. 12 performs processing to detect occurrence of a failure in the policing circuit 1a by using the user cell in use.

Although the embodiment of FIG. 12 discloses that only the user cell in use is used, the function monitoring having the same virtual path for the user cell in use is disclosed in combination with the configuration of FIG. It is also possible to adopt a configuration in which the occurrence of a failure in the polishing circuit 1a is detected by adding a cell and forcibly increasing the flow rate.

FIG. 13 shows an embodiment according to this configuration. In this embodiment, since the function monitoring cell having the virtual path in use is introduced, unlike the configuration of FIG.
The mask section 37 described in the embodiment of FIG. 12 is provided.

According to this configuration, the function monitoring unit 31
When the failure detection of the policing circuit 1a is executed, for example, an increase in the flow rate at which the flow rate of the user cells flowing into the policing circuit 1a will be excessive is determined. Then, by specifying an occurrence parameter for realizing the increase in the flow rate and notifying the function monitoring cell generation unit 32, a function monitoring cell corresponding to the increase in the flow rate is generated and input to the policing circuit 1a. Go. In response to the input of the function monitoring cell, the policing circuit 1a collects information indicating whether the flow rate is excessive or not for the user cells whose function monitoring cells have been increased, and collects information indicating that the flow rate is not excessive. If the output is an output, it indicates that a failure has occurred in the policing circuit 1a, so that the fact is output. At this time, the user cell having the virtual path used for the failure detection is not discarded according to the processing of the mask unit 37.

As described above, the policing mechanism failure detecting device 3 of the embodiment of FIG. 13 detects the occurrence of the failure of the policing circuit 1a by increasing the flow rate of the user cell in use by using the function monitoring cell. It is processed to go.

In the embodiments shown in FIGS. 12 and 13, the mask portion 37 is required. The provision of the mask unit 37 complicates the control. FIG. 14 illustrates an embodiment that realizes a configuration equivalent to that of the embodiment illustrated in FIG. 12 without using the mask unit 37.

In this embodiment, in correspondence with the fact that the violation judging circuit 50 of the polishing circuit 1a shown in FIG. 12 can be separated into a counter 500 and a comparator 501, a comparator for polishing 501a and a comparator for monitoring are compared. And a comparator 5b for polishing.
01a, the control of the discard control unit 51 is executed, and the monitoring comparator 501b checks the excess flow rate of the user cells. Here, in the drawing, reference numeral 38a denotes a holding unit which is provided corresponding to the comparator 501a and holds a polishing parameter for polishing;
A holding unit 8b is provided corresponding to the comparator 501b and holds a monitoring policing parameter.

FIG. 14 discloses an embodiment in which the same configuration as that of the embodiment shown in FIG. 12 is realized without using the mask portion 37. However, the same configuration as that of the embodiment shown in FIG. Can be realized without using the mask unit 37.

[0058]

As described above, according to the present invention,
This makes it possible to accurately detect the occurrence of a failure in the policing mechanism of the ATM communication device.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an invention related to the present invention.

FIG. 2 is a principle configuration diagram of the present invention.

FIG. 3 is a diagram illustrating the principle of the present invention;

FIG. 4 is a circuit configuration diagram of a polishing mechanism.

FIG. 5 is an explanatory diagram of a polishing mechanism failure detection device having a configuration related to the present invention.

FIG. 6 is a circuit configuration diagram of a function monitoring cell generator.

FIG. 7 is an explanatory diagram of a generation cycle of a function monitoring cell.

FIG. 8 is an example of a post-processing unit.

FIG. 9 is an example of a post-processing unit.

FIG. 10 is an embodiment of the present invention.

FIG. 11 is an embodiment of the present invention.

FIG. 12 is another embodiment of the present invention.

FIG. 13 is another embodiment of the present invention.

FIG. 14 is another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 policing mechanism 2 excess cell processing circuit 3 policing mechanism failure detecting device 4 input unit 5 detecting unit 6 indicating unit 7 setting unit 8 post-processing unit 9 buffering unit 10 changing unit 11 control unit

Continuing on the front page (72) Inventor Hiroshi Takeo 1015 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Naoaki Yamanaka 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation ( 72) Inventor Yoichi Sato Nippon Telegraph and Telephone Corporation, 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo (56) References JP-A-4-207544 (JP, A) JP-A-4-192283 (JP, A) JP-A-5-110585 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04L 12/56 H04L 12/28 H04L 12/26 H04L 12/24

Claims (5)

(57) [Claims] 1. A polishing mechanism failure detection device for detecting a failure of the operation to reportage policing the mechanism so as to check the cell Le flow to the virtual path basis, one is instructed to policing mechanisms or more A changing unit for fixedly or variably changing a policing parameter for a virtual path; and when the changing unit changes the policing parameter,
A detecting unit for detecting occurrence of a failure of the policing mechanism based on the change value and a detection response of the policing mechanism for a user cell having a virtual path to be changed by the changing unit; A policing mechanism failure detection device, comprising: a control unit that controls a user cell determined to be an excess cell based on a parameter so that processing is not performed on the excess cell. 2. A policing mechanism failure detection device for detecting a failure of the operation to reportage policing the mechanism so as to check the cell Le flow to the virtual path basis, a fixed amount or a variable amount with the virtual path in use An input unit for inputting the function monitoring cell to the policing mechanism; and when the input unit inputs the function monitoring cell, the input amount and a detection response of the policing mechanism to a user cell having a virtual path of the function monitoring cell. Accordingly, a detection unit for detecting occurrence of a failure in the policing mechanism and a user cell determined to be an excess cell by the function monitoring cell input by the input unit are controlled so that processing for the excess cell is not performed. A polishing mechanism failure detection device, comprising: a control unit. 3. A polishing mechanism failure detecting apparatus according to claim 2, downstream of the polishing mechanism, further comprising a post-processing unit which processes to function monitoring cell to be turned on by the insertion portion does not affect the subsequent Policing mechanism failure detection device. 4. A policing mechanism failure detecting apparatus according to claim 2 , wherein the buffering section is provided with either a function monitoring cell buffering section or a user cell buffering section at a stage preceding the policing mechanism. A policing mechanism failure detection device characterized by preferentially feeding a cell having no ring portion to a policing mechanism. 5. The policing mechanism failure detecting apparatus according to claim 4, wherein said detection unit, when a user cell is turned on preferentially policing mechanism, a function monitoring cell estimated indirectly from the flow of user cells The policing mechanism failure detection device is characterized by evaluating the detection response of the policing mechanism in consideration of the actual input amount or the actual input amount of the function monitoring cell directly estimated from the function monitoring cell input notification. .