WO2000054461A1

WO2000054461A1 - Polisher and polishing method

Info

Publication number: WO2000054461A1
Application number: PCT/JP1999/001091
Authority: WO
Inventors: Michio Kusayanagi; Jun Tanaka; Masato Okuda; Kazuto Nishimura
Original assignee: Fujitsu Limited
Priority date: 1999-03-05
Filing date: 1999-03-05
Publication date: 2000-09-14

Abstract

A polisher in which the amount of fixed-length data sent into a network is controlled. The frame of the upper layer to which the fixed-length data belongs is recognized, the violation of the fixed-length data in the frame is judged, and the results of the judgment are held. The processing (for example, forced deletion, CLP tagging, or marking on the extended header) is applied to the succeeding fixed-length data in the same frame. Thereby the amount of fixed-length data sent out to a network is controlled and unnecessary traffic in the network does not flow, increasing the efficiency of the network.

Description

Description Polishing apparatus and polishing method

INDUSTRIAL APPLICABILITY The present invention can suitably perform UPC (Usage Parameter Control) in a system that performs IP Pnetternet Protocol (I Pdnternet Protocol) communication using fixed-length data to which unique identification information such as an ATM (Asynchronous Transfer Mode) cell is added. The present invention relates to a polishing apparatus and a polishing method. Background art

ATM cells are transmitted from the terminal at the subscriber's home (such as a personal computer) to the ATM network, and a technology called policing has been devised to check whether the transmitted ATM cell is a correct ATM cell.

The policing device is called an UPC device at an interface between a user and a network, and is called an NPC (Network Parameter Control) device at an interface between networks.

In the policing apparatus 11A shown in FIG. 22, for example, the amount of ATM cells sent from the user terminal 50 to the network 30 is monitored, and a virtual path (hereinafter, referred to as VP) of each ATM cell is monitored. Alternatively, based on a comparison with a contract parameter set on a virtual channel (VC), it is determined whether the received ATM cell is in violation. Forced discard (hereinafter simply referred to as “discard”) for the violating ATM cell, or CLP (Cell Loss Priority) bit in the ATM cell header called “Evening” Write to the box.

Whether to perform forced discarding or tagging as the processing for the violating ATM cell depends on the settings of the maintenance person of the ATM network.

In recent years, there has been a growing demand for TCP / IP communication represented by LANC Local Area Network) and the Internet (Internet), as well as demand for higher speed. Also, it has been devised that ATM communication is used in a lower layer of IP communication. As shown in FIG. 23, an IP frame is finally subdivided and transmitted to a destination by a plurality of ATM cells. Sent.

For example, as shown in Fig. 23, one IP frame is transmitted in a frame configuration mounted on one CPCS (Common Part Convergence Sublayer)-PDU (Protocol Data Unit) (hereinafter simply referred to as PDU). In addition, the data is subdivided at the ATM cell level and transmitted.

If one ATM cell that constitutes an IP frame is discarded by the above UPC etc., even if the ATM cells in the PDU that are not discarded are received by the receiver, a part of the IP frame Since the receiving side cannot reassemble the IP frame due to the lack of ATM cells, the receiving side does not need to receive the ATM cells in the PDU.

In addition, even one ATM cell for composing one IP frame is tagged, and due to the influence of traffic fluctuation of the ATM network, etc., the ATM cell subjected to evening traffic is transmitting on the ATM network. Even if the IP frame is discarded, the receiving side may not be able to reconstruct the IP frame.

In addition, reducing the necessity of reception on the receiving side and transmitting the ATM cell into the ATM network has a problem that the use efficiency in the network is deteriorated.

The present invention has been made in view of such a problem, and performs processing of fixed-length violation data in a frame of an upper layer on subsequent fixed-length data subsequent to fixed-length data in the same frame to improve network performance. An object of the present invention is to provide a polishing apparatus and a polishing method capable of improving the efficiency of polishing. Disclosure of the invention

In order to achieve the above object, a policing apparatus according to the present invention includes a frame recognition unit that recognizes a frame of an upper layer to which fixed-length data belongs, and a fixed-length data in a frame recognized by the frame recognition unit. Judgment unit for judging a violation, holding unit for holding the judgment result of the judgment unit for each identification information, and discarding the fixed-length data determined to be a violation by the judgment unit and the same as the fixed-length violation data Violation fixation in frame It is characterized by comprising a discard processing unit that discards the following fixed-length data following the long data.

As a result, if there is a violation, the fixed-length data after the fixed-length data in the same frame is discarded, so that unnecessary traffic does not flow through the network, and network efficiency can be improved.

In order to achieve the above object, a policing apparatus according to the present invention further comprises a fixed-length data frame recognizing unit for recognizing a frame of an upper layer to which the fixed-length data belongs. A judging unit for judging a violation, a holding unit for holding the judgment result of the judging unit for each identification information, and adding a mark indicating a violation to the violation fixed length data judged to be violated by the judging unit, It is characterized by comprising a fixed-length data and a discarding processing unit that adds a mark to the following fixed-length data following the violation fixed-length data in the same frame.

In this way, when there is a violation, the same processing is performed on the fixed-length data after the fixed-length data in the same frame, so that network efficiency can be improved.

Further, the discard processing unit may be provided with a loss allowance information adding unit for adding loss allowance information indicating that the violation fixed length data is allowed to be lost in the network.

Alternatively, the discard processing unit may be configured to include a violation information adding unit that adds violation information to the extended data added to the fixed-length violation data.

Alternatively, a setting information holding unit that holds information indicating a process to be performed on the violation fixed length data is provided, and a process is performed on the violation fixed length data and the subsequent fixed length data based on the information held in the setting information holding unit. The disposal unit may be configured as described above.

Alternatively, the discard processing unit may be provided with a replacement unit that replaces the first fixed-length violation data in the frame determined by the determination unit with pseudo final fixed-length data in the frame and transmits the data.

Alternatively, it is preferable that the discard processing unit is configured to pass the final fixed-length data when the determination unit determines that the final fixed-length data in the frame violates. Or at least the last fixed length data in the frame or the beginning of the next frame It is also possible to provide a release unit for releasing information about the fixed length data of the frame held in the holding unit based on the fixed length data.

Alternatively, the judgment unit has a head information holding unit for holding information of the head fixed length data positioned at the head of the frame determined to be the violation fixed length data, and a head for which information is held in the head holding unit. The discard processing unit may be configured to perform the same processing as that performed on the first fixed-length data in all fixed-length data in the frame to which the fixed-length data belongs.

Alternatively, each identification information includes a type holding unit for holding fixed length data type information indicating that the upper layer of the fixed length data has a frame structure, and the determining unit stores the fixed length data type information in the type holding unit. The discard processing unit may be configured to perform the same processing as that performed on the fixed-length data following the fixed-length data following the fixed-length data that holds the violation.

Alternatively, the holding unit may include a counter that counts the number of times the offending language is held for each piece of identification information.

On the other hand, in order to achieve the above object, the policing method of the present invention recognizes a frame of an upper layer to which fixed-length data belongs, determines a violation of fixed-length data in the frame, and determines a violation fixed length in the frame. It is characterized in that the same processing as that performed on the violation fixed-length data is applied to all subsequent fixed-length data following the data.

In this way, if there is a violation, the same processing (discarding, masking, etc.) is performed on the fixed-length data after the fixed-length data in the same frame, and network efficiency can be improved. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a polishing apparatus according to an embodiment of the present invention. FIGS. 2 (a) to 2 (c) are diagrams for explaining examples of the data structure of signals transmitted from the subscriber's house.

FIG. 3 is a diagram for explaining an example in which data is held in a violation recording unit according to an embodiment of the present invention.

FIG. 4 is a block diagram showing functions of a violation determination unit according to one embodiment of the present invention. FIG. 5 is a block diagram showing a cell control unit according to one embodiment of the present invention.

FIGS. 6 (a) to 6 (c) are diagrams for explaining processes performed on ATM cells input to the polishing apparatus according to one embodiment of the present invention.

FIG. 7 is a flowchart for explaining the function of the violation determination unit according to one embodiment of the present invention.

FIG. 8 is a diagram for explaining an example in which data force is held in a violation part according to a first modification of one embodiment of the present invention.

FIG. 9 is a block diagram showing functions of a violation determination unit according to a first modification of the embodiment of the present invention.

FIG. 10 is a flowchart for explaining the function of a violation determination unit according to a first modification of the embodiment of the present invention.

FIG. 11 is a block diagram illustrating functions of a violation determination unit according to a second modification of the embodiment of the present invention.

FIG. 12 is a block diagram showing a cell control unit according to a second modification of the embodiment of the present invention.

FIGS. 13 (a) to 13 (c) are diagrams for explaining processes performed on ATM cells input to the polishing apparatus according to the second modification of the embodiment of the present invention. FIG. 14 is a block diagram showing a polishing apparatus according to one embodiment of the present invention. FIG. 15 is a block diagram showing a polishing apparatus according to a sixth modification of the embodiment of the present invention.

FIGS. 16A to 16C are diagrams for explaining the operation of the polishing apparatus according to the sixth modification of the embodiment of the present invention.

FIG. 17 is a block diagram showing a polishing apparatus according to a seventh modification of the embodiment of the present invention.

FIG. 18 is a block diagram showing a cell control unit according to an eighth modification of the embodiment of the present invention.

FIG. 19 is a flowchart for explaining the function of a polishing apparatus according to an eighth modification of the embodiment of the present invention.

FIG. 20 is a diagram showing a violation determining unit according to an embodiment of the present invention. FIG. 21 is a block diagram showing a polishing apparatus according to a third modification of the embodiment of the present invention.

FIG. 22 is a block diagram showing the arrangement of the UPC.

Fig. 23 is a diagram for explaining an example of the data structure of a signal sent from the subscriber's house. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the invention will be described with reference to the drawings.

(a) Description of one embodiment of the present invention

A policing device 1 according to an embodiment of the present invention shown in FIG. 1 is provided in a subscriber line terminal (SLT) 100 provided at an entrance in an ATM network, Checks whether the ATM cell entered at the entrance of the network is the correct ATM cell as specified.For example, the ATM cell transmitted by the DSU (Digital Service Unit) in each user's home The amount of (fixed-length data) sent into the ATM network is determined by the usage parameter control (UPC) for each Virtual Path Identifier (VPI) / Virtual Channel Identifier (VCI) (identification information). Is performed. The ATM cells transmitted from the DSU in each user's premises are divided into PDUs, which are frames of the upper layer, and mounted on the pay mouth, and the PDU contains IP frames of the upper layer. Power mounted.

That is, the IP frame shown in Fig. 2 (a) is mounted on the payload of the PDU shown in Fig. 2 (b), and the PDU shown in Fig. 2 (b) is divided into multiple ATMs shown in Fig. 2 (c). It is mounted on the cell payload.

In addition, the power to which ATM cells of different VP I / VC I are input to the policing device 1, and FIG. 2 (c) shows the ATM cells (cl to c 7) of the same VP I ZVC I. A plurality of ATM cells of different VP I / VC I can exist between ATM cells (cl to c 7).

In the following, an example will be described in which the IP frame is powerfully installed in a plurality of ATM cells via PDUs and transmitted from the DSU in each user's home. The policing device 1 controls the amount of ATM cells sent to the network for each VP I / VC I on a per ATM cell basis. (Violated ATM cell; violation fixed length data) If there is power, all subsequent ATM cells (following fixed length data) following the violation ATM cell in the PDU are discarded.

Therefore, as shown in FIG. 1, the policing device 1 includes a VP / VC recognition unit 2, a frame recognition unit 3, a violation determination unit 4, a violation recording unit 5, a cell control unit 6, and a delay unit 7. It is configured.

Here, the VP / VC recognition unit 2 detects the VP I / VC I in the header of the ATM cell input to the policing device 1 and outputs it to the violation determining unit 4. The frame recognition unit 3 recognizes the position in the frame of the upper layer to which the ATM cell belongs. The frame recognition unit 3 has a payload type 3 (hereinafter referred to as PT) 3 bit (hereinafter, referred to as PT) in the header of the ATM cell. (Referred to as the PT 3 bit) and outputs the detected PT 3 bit to the violation determination unit 4.

Note that the last ATM cell in one PDU (called the last ATM cell; last fixed length data) is the PT3 bit power in the header, "1", and the other ATM cells in the PDU. The PT3 bit of "0" indicates "0". “0” and “1” in each ATM cell shown in FIG. 2 (c) indicate the three PT bits.

The violation recording unit (holding unit) 5 holds the determination result of the violation determining unit 4 for each VPI / VCI.

In addition, the violation section 5 can be configured using a memory, a RAM, or the like. For example, as shown in FIG. 3, a violation record “0 (no violation record)” or a violation record is stored in a predetermined area on the memory. Violation n "1 (violation recorded)" is retained.

Further, the violation determination unit (determination unit, release unit) 4 is for determining a violation of the ATM cell in the PDU recognized by the frame recognition unit 3, and for each ATM cell input to the policer 1, It is determined whether or not each ATM cell power is violated, and if violated, a discard request (requesting ATM cell discard) "1" or a pass request "0" is output to the cell controller 6. .

Here, FIG. 4 is a diagram showing a function block of the violation judging unit. As described above, the violation judging unit 4 includes the arithmetic unit 41, the information holding unit 42, and the control unit 43.

The information holding unit 2 holds the information necessary for the liquid-bagged calculation for each VPI / VC I. As information to be held, the data of the speed for each VP IZVC I (peak rate, average Rate), cell fluctuation (tolerance of cell interval of the same VPI / VCI), maximum burst size, etc.

The operation unit 41 determines whether or not the ATM cell power of the VP IZVC I received from the VP / VC recognition unit 2 violates. The arithmetic unit 41 determines whether or not the force violates the ATM cell by performing a rekey bucket type algorithm (operation), and controls the violating force or not based on the result of the operation. Output to part 43. For example, a signal “1 (violation)” or “0 (non-violation)” indicating whether or not the input ATM cell corresponds to the violating ATM cell is output to the control unit 43 from the operation result.

The arithmetic unit 41 determines a violation for each ATM senor input to the policing apparatus 1, and provides necessary information when calculating a liquid crystal for determining a violation. The information is read from the information holding unit 42.

The control unit (cancellation unit) 43 outputs a discard request to the cell control unit 6 based on the information sent from the arithmetic unit 41, VP / VC recognition unit 2, frame recognition unit 3, and violation recording unit 5. And writing to the violation recording unit 5 and reading from the violation recording unit 5.

Here, the control unit 43 sends a plurality of ATM cells of the same VP I / VC I in one PDU to the policing device 1 sequentially, and one ATM cell among the plurality of ATM cells is When the arithmetic unit 41 determines that the cell is a violating ATM cell, the cell control is performed on the subsequent ATM cell (regardless of violating or not) following the violating ATM cell in the same manner as the violating ATM cell. Part 6 is controlled.

For example, even if the control unit 43 receives from the arithmetic unit 41 a signal “0” indicating that a certain VP I / VC I (①) does not violate the ATM cell, the control unit 43 stores the VP I / VC I in the violation recording unit 5. (①) Violation record "1" If the power is held, the following ATM cell power error Even if not contrary (even if it is not determined to be a violation by the arithmetic unit 41), a request to discard the ATM cell (discard request) “1” is output to the cell control unit 6 in the same manner as the violated ATM cell.

On the other hand, when the ATM cell is the last ATM cell in the PDU, the control unit 43 controls the cell control unit 6 and resets the violation record held in the violation recording unit 5. I have.

For example, the control unit 43 sends a discard request to the cell control unit 6 when the ATM cell of the VP I / VC I is held in the violation recording unit 5 and is the last ATM cell. In addition to the output, the offending word Ξϋ “1” held in the offending word line 5 is reset to “0”.

Next, the cell control unit (discard processing unit) 6 shown in FIG. 1 discards the violation A され cell determined to be violated by the violation determination unit 4 and violates the violation A in the same PDU as the TM cell. The ATM cell following the TM cell is also discarded, and the ATM cell is discarded based on the discard request "1" sent from the violation judging unit 4. The control unit 6 has a disposal unit 61 as shown in FIG.

The discarding unit 61 is configured to include a discard information holding unit 61a and a switch 61b, and discards an ATM cell upon receiving a discard request "1" from the violation judging unit 4, and discards the ATM cell. ATM cells are replaced with empty cells (idle cells).

Here, the discard information holding unit 61a holds the data of the empty cell, and when the switch 61b receives the discard request “1” transmitted from the violation judging unit 4, the ATM cell becomes the empty cell. It is a thing to switch.

Note that the delay unit 7 shown in FIG. 1 delays the phase of the ATM cell and sends the ATM cell to the cell control unit 6 so that the input ATM cell can be subjected to desired processing. Hereinafter, the operation of the policing apparatus 1 configured as described above will be described with reference to FIG. 6c.Note that FIG. 6 (a) shows the same VP I / VC I ATM cell as in FIG. 2 (c). This means that among the ATM cells (cl to c8) shown in Fig. 6 (a), the ATM cell (cl to c7) is the ATM cell in the same PDU, and the ATM cell (c8) of It means that it is an ATM cell in the PDU, and “0” and “1” in the ATM cells (cl to c8) represent PT3 bits.

Also, the description will be made on the assumption that the ATM cell (c4) among the ATM cells (cl to c8) is a violating ATM cell.

When the ATM cell (c 1) is input to the policing device 1 at the timing T1, the VP / VC recognition unit 2 sends the detected VPI / VC I to the violation determination unit 4 and the frame recognition unit 3 Sends the PT3 bit “0” in the header of the ATM cell to the violation determination unit 4.

The violation judging unit 4 judges a violation of an input ATM cell based on VPI / VI, PT 3 bit “0” and the like.

Next, the function of the violation determination unit 7 will be described with reference to FIG.

When the policer 1 is activated, the violation judging unit 4 starts the violation judging process (step S1), judges whether the VP I / VC I and the cell position (PT 3 bits) have been received, and receives them. If not, wait (NO in step S2). When the VP IZV CI and the cell position (PT3 bit) are received, the arithmetic unit 41 performs the liquid bucket type arithmetic operation (from the YES route of step S2 to step S3), and the arithmetic operation unit 41 calculates the force (whether or not there is a violation). Output to the control unit 43.

Then, the control unit 43 determines whether or not the ATM cell (c 1) power input to the polishing apparatus 1 is violated by the signal (0 or 1) sent from the arithmetic unit 41 (step S4).

In this example, since the ATM cell (c1) is not a violating cell, the control unit 43 reads the violation record held for the VP IZVC I of the ATM cell (c1) from the violation recording unit 5 ( From the NO route of step S4 to step S11). Note that “0” and “1” shown in FIG. 6B indicate violation records of the ATM cells (cl to c8) stored in the violation recording unit 5.

The control unit 43 determines the violation record read from the violation statement unit 5 (step S12), and since the violation record is "0" at the evening T1, the ATM cell (c1) is polished. Pass through 1 (NO route from step S12 to step S13). That is, the control unit 43 does not output a discard request to the senor control unit 6. FIG. 6 (c) shows the processing performed by the policing device 1 for each ATM cell (c1 to c8). As shown in FIG. 6 (c), the ATM cell (c1 ) Is subjected to passage processing. Then, the ATM cell (c 1) passes through the policing device 1 and is sent in the direction of an ATM switch (not shown).

The same processing power is applied to the ATM cells (c2, c3) shown in Fig. 6 (a), and each ATM cell (c2, c3) is sent to the ATM switch.

Next, when the ATM cell (c 4) is input to the policing device 1 at the timing T 4 shown in FIG. 6, the VP I / VC I and the PT 3 bit are transmitted as in the case of the ATM cell (c 1). Upon detection, the calculation unit 41 of the violation determination unit 4 performs a liquid bucket type calculation.

Here, when the calculation result of the liquid bucket method in the calculation unit 41 indicates that the ATM cell (c 4) power is violated, the calculation unit 41 sends a signal “1” indicating the violation to the control unit. 43, and the control unit 43 reads the violation words held for the VP I / VC I of the ATM cell (c 4) from the violation recording unit 5 since the operation result does not indicate a violation (step S From step 4 of the YES route, step S5), it is determined whether the offense is "1" (step S6).

In this case, since the violation record is “0”, the control unit 43 writes the violation record held for the VP I / VC I of the ATM cell (c 4) to “0”, “1”, etc. In addition to the switching, a discard request “1” is output to the cell control unit 6 (from the NO route of step S6 to step S7).

The cell control unit 6 replaces the ATM cell (c 4) with an empty cell by switching the ATM cell (c 4) sent from the switch 6 lb card delay unit 7 of the discarding unit 6 1 to an empty cell. Is disposed of.

Then, the subsequent ATM cell (c 5) following the offending ATM cell in the same PDU indicates that the operation result of the operation unit 41 does not violate the ATM cell (c 5). The control unit 43 outputs a signal “0” indicating no violation, and indicates that the operation result does not violate. Therefore, the control unit 43 holds the VP I / VC I of the ATM cell (c 5) from the violation recording unit 5 The read violation record is read (from the NO route of step S4 to step S11). The control unit 43 determines whether the violation record is “1” (step S 1 2) Since the violation record is "1", it is determined whether or not the ATM cell (c5) is the last ATM cell (step S8 from the YES route of step S12). Based on the PT3 bit “0” of the subsequent ATM cell (c5) received from the frame recognizing unit 3, the control unit 43 determines that the subsequent ATM cell (c5) does not correspond to the last ATM cell, A discard request is output to the cell controller 6 (step S10 from the NO route in step S8). Then, the succeeding ATM cell (c5) is replaced with a vacant cell and discarded, like the violating ATM cell (c4). Note that the subsequent ATM cell (c6) in the same PDU is also discarded by the cell control unit 6, similarly to the subsequent ATM cell (c5).

Then, the last ATM cell (c 7) in the same PDU input to the policing device 1 at the timing T 7 is subjected to the same processing as that for the subsequent ATM cell (c 5, c 6) by the violation determination unit 4. In addition, since the last ATM cell (c7) received from the frame recognition unit 3 has the PT3 bit value of “1”, the control unit 43 determines the VP I / VC I of the ATM cell (c 7). The stored violation record "1" is rewritten to the violation record "0", and a discard request is output to the senor control unit 6 (from the YES route in step S8 to step S9).

When the power of the ATM cell (c8) in the next PDU is input, the policer 1 performs a violation determination process. As shown in FIG. 6 (c), the ATM cell (c8) is subjected to a passing process, and the ATM cell (c8) is sent in the direction of the ATM switch.

In the above description, the power of explaining the operation of the policing apparatus 1 by focusing on the ATM cell having the same VPI ZV CI, for example, the ATM cell (c 2) after the ATM cell (c 1) is input to the policing apparatus 1 While the ATM cells with different VPIs / VCIs are input while policers are input to the policing device 1, the policing device 1 applies the same operation to the ATM cells with different VPI / VCIs. Perform processing.

As described above, according to the policing apparatus 1 according to the embodiment of the present invention, the discard processing performed on the violated ATM cell in the PDU is performed not only on the violated ATM cell but also on the succeeding ATM cell, so that the receiving side is required. By not sending low-intensity ATM cells to the ATM network, congestion that may occur in the ATM network is reduced, and the ATM network Work efficiency can be improved.

By the way, in the polishing apparatus 1 according to the above-described embodiment, when there is a force violation described in the violation recording unit 5 in which the violation records “1” and “0” are held, the violation records “1” and “0” Instead, the polishing apparatus 1a can be configured with a violation recording unit 5a that holds the VCI of the violating ATM cell (see FIG. 1).

Here, FIG. 8 is a diagram showing an example in which data is held in the violation word section 5a. The violation recording section 5a shown in FIG. 8 includes the VCI (11 and 16) of the violation ATM cell. ) Strongly held.

In addition, the policing apparatus 1a has a violation determination unit 4a instead of the violation determination unit 4, and the violation determination unit 4a is compared with the violation determination unit 4. Write the VCI of the violated ATM cell to (2) Search for whether the violation record (VCI) is stored in violating section 5a when determining the processing to be performed on the subsequent ATM cell, At the time of processing, the VCI of the last ATM cell is deleted from the offending part 5a.

For this reason, the violation determination unit 4a has a control unit 43a instead of the control unit 43, and the control unit 43a differs from the control unit 43 in that it also performs the above ① to ③.

The operation of the violation judging unit a of the polishing apparatus 1a is the same as the operation of the mouthpiece shown in FIG. 5 above. In steps S5 and S11, the control unit 43a performs processing. The VCI force of the target ATM cell is maintained, and the violation recording section 5a is searched and read.

In step S7 shown in FIG. 7, the control unit 43a outputs a discard request to the cell control unit 6 as a process to be performed on the violating ATM cell, and also records the VCI of the violating ATM cell in the violation recording unit. 5 is to write to a. Further, in step S9 shown in FIG. 7, the control unit 43a outputs a discard request to the cell control unit 6, and deletes the VCI of the violating ATM cell from the violation recording unit 5a. Has become.

In the polishing apparatus 1a configured as described above, the efficiency of the network can be improved as in the case of the polishing apparatus 1, and the violation recording section 5a records the violation of VPI / VCI like the violation recording section 5 like the violation recording section 5. Since the area for retaining the memory is not necessarily required, the use efficiency of the memory and the like can be improved. (a-1) Description of First Modification of One Embodiment of the Present Invention

Next, a description will be given of a polishing apparatus according to a first modified example of the embodiment of the present invention with reference to FIG. 1. The polishing apparatus 1-1 according to the first modified example of the embodiment of the present invention includes: Compared to the policing apparatus 1 according to the above-described embodiment, processing to be applied to the violating ATM cell is set for each VPI / VCI, and the set processing is applied to the violating ATM cell.

That is, for each VPI / VCI, information indicating a discarding process or a passing process is set as a process to be applied to the violating ATM cell, and according to the setting, the policing apparatus 1-1 discards or passes the violating ATM cell. Processing is performed.

For this reason, the policing device 1-1 has a violation determining unit 411 instead of the violation determining unit 4 (see FIG. 1). The violation determining unit 411 performs the processing performed on the violating ATM cell. However, this is different from the violation determination unit 4 in that a discard request is issued to the cell control unit 6 with reference to the setting information held for each VPI / VCI.

Here, the setting information is information indicating a process to be performed on a violated ATM cell set by a maintenance person such as an ATM network. The setting information is written by a control device outside the policing device 11 every time the VC force is established.

In the first modified example of the embodiment, an example will be described in which the processing performed on the violating ATM cell is a discarding processing or L or passing processing.

The violation judging section 411 shown in FIG. 9 includes a control section 43-1 in place of the control section 43, and further includes a setting information holding section 44.

Here, the setting information holding unit 44 holds setting information indicating processing to be performed on the violating ATM cell when the ATM cell violates for each VPI / VCI. For example, the violating ATM The setting "1" to perform the discarding process on the cell or the setting "0" to perform the passing process even for the violating ATM cell is retained.

The control unit 43-1 differs from the control unit 43 in that the control unit 43-1 determines whether or not to output a discard request to the sensor control unit 6 according to the setting information stored in the setting information storage unit 44. For example, even if the operation unit 41 gives a violation result, if the setting information holding unit 44 holds the setting information to pass through the violating ATM cell, the cell control unit No output to 6.

Note that in FIG. 9, there is a description that a signal (whether discarding or tagging) is transmitted from the control unit 43-1 to the cell control unit 6 according to the first modification of the first embodiment. In the judgment section 4-1, since evening ging (described later) is not involved, the drawing is used assuming that there is no evening ging signal.

According to the policing device 1-1 configured as described above, a plurality of ATM cells (c1 to c7) shown in FIG. 6 (a) are sequentially input to other VP I / VC I ATM cells in a mixed manner. Then, similarly to the policing device 1, the VPZVC I of the incoming ATM cell is detected by the VPZVC recognition unit 2, and the frame recognition unit 3 detects the PT3 in the header of the ATM cell. The bits are detected and the information is sent to the violation judging unit 411.

Upon receiving the VP I / VC I and the PT3 bit sent from the frame recognizing unit 3 and the VP Z VC recognizing unit 2, the violation determining unit 411 determines a violation of the ATM cell. Here, the operation of the violation determination unit 411 will be described with reference to FIG. 10.However, the steps in which the code shown in FIG. 10 and the code shown in FIG. 7 are the same must be performed by the same or similar processing power. Means

The difference between the violation determination processing shown in FIG. 7 and FIG. 10 is that, as shown in FIG. 10 and FIG. 7, FIG. 10 is different from step S5 and step S11 shown in FIG. The process of reading the violation record held for the VP IZVC I of the processing target ATM cell from the part 5 and the process of reading the setting information indicating the processing to be performed on the ATM cell of the processing target VPI ZV CI from the setting information holding unit 44 (Step S5A, Step S11A)

In FIG. 10, step S6-1 is between the NO route of step S6 and step S7, and step S8-11 is between step YES of step S8 and step S9. Step S8-2 is provided between the N〇 route of step S8 and step S10.

In each of steps S6-1, S8-1, and S8-2, it is determined whether or not the information read from the setting information storage unit 44 indicates that the setting information has been discarded. The setting information read out from the setting information holding unit 44 is If the setting is not the discard setting, the control unit 43-1 performs a passing process as a process to be performed on the violating ATM cell to be processed. That is, the control unit 43-1 does not transmit the discard request “1” to the cell control unit 6.

On the other hand, if the discard setting is made, the control unit 43-1 transmits the discard request to the cell control unit 6 and violates the violation recording unit 5, as in the violation determination unit ^{4 according} to the embodiment. Write the record "1" (from the YES route of step S6-11 to step S7), or rewrite the violating word "1" held in the violating word BII part 5 to "0" and change the cell control unit The discard request is output to the cell controller 6 (step S9 from the YES route of step S8-1), or the discard request is output to the cell controller 6 (step S10 from the YES route of step S8-2).

By such processing, for example, when the pass processing is set by the maintenance person of the ATM network as the processing to be performed on the ATM cells (cl to c8) shown in FIG. Even if (c 4) is determined to be a violating ATM cell and a signal “1” is transmitted to the control unit 43-1 as a violation, the control unit 43-1 sends the signal to the cell control unit 6. Does not output a discard request.

Therefore, the subsequent ATM cells (c5 to c7) shown in FIG. 6 (a) are also subjected to the passing process and sent to the ATM switch side.

If the process to be performed on the violated ATM cell is set to be discarded by the setting of the maintenance person of the ATM network, the control unit 43-like the policing apparatus 1 according to the embodiment described above. 1 outputs a discard request "1" to the cell control unit 6, and outputs a discard request "1" to the cell control unit 6 for the subsequent ATM cell in the same PDU. Is also discarded.

As described above, according to the polishing apparatus 1-1 according to the first modified example of the embodiment of the present invention, it is possible to improve the efficiency of the network similarly to the polishing apparatus 1 according to the embodiment, In this case, the fixed-length data is not discarded uniformly, but only if the discard setting is made by the maintenance person of the ATM network. Processing is possible.

By the way, in the policing apparatus according to the first modification of the embodiment of the present invention, the violation recording unit 5a that holds the VCI of the violating ATM cell is used instead of the violation recording unit 5. And a polishing apparatus 1-1a can be configured (see Fig. 1).

In addition, the policing device 1-1a has a violation determination unit 4-1a instead of the violation determination unit 1-1, and the violation determination unit 4-1a is compared with the violation determination unit 4-1. (1) Write the VCI of the violating ATM cell to the violating record section 5a. (2) When processing the subsequent ATM cell, check whether the violating record (VCI) is retained in the violating violating record section 5a. 2. When processing the last ATM cell, the VCI of the last ATM cell is deleted from the offending part 5a.

For this reason, the violation judging section 4-1a has a control section 43-1a instead of the control section 43-1 (see FIG. 9). It differs from the control unit 43-1, in that it also performs ③.

The operation of the violation judging unit 4-1a of the policing device 1-1a is the same as that of the flowchart shown in FIG. 10 described above. In steps S5A and S11A, the control unit 43 1a searches the violating recording unit 5a to determine whether the VCI of the ATM cell to be processed is held strongly, and reads out if it is held. In step S7 shown in FIG. 10, as a process for the violating ATM cell, a discard request is output to the cell control unit 6, and the VCI of the violating ATM cell is written to the violation recording unit 5a. Te In step S9 shown in FIG. 10, a discard request is output to the cell control unit 6, and the VCI of the violating ATM cell is deleted from the violation recording unit 5a.

Such a policing device 1-1a can improve the network efficiency and safely dispose of the network in the same manner as the policing device 1-1-1. In this case, it is not always necessary to have an area for storing the violation records for the VPI / VCI, so that the use efficiency of the memory and the like can be improved.

(a-2) Description of Second Modification of One Embodiment of the Present Invention

Next, a description will be given of a polishing apparatus according to a second modification of the embodiment of the present invention with reference to FIG. 1 .The polishing apparatus 112 according to the second modification of the embodiment of the present invention will be described below. Compared to the policing device 1 according to the embodiment, the first violating ATM cell in the PDU is replaced with the last ATM cell (pseudo final fixed length data) and transmitted. For this reason, the policing device 1-2 includes a violation determination unit 4-2 instead of the violation determination unit 4, and a cell control unit 6-1 instead of the cell control unit 6 (see FIG. 1).

Here, when detecting the first violating ATM cell in the PDU, the violation judging unit 4-2 rewrites the violating ATM cell to the last ATM cell without discarding the cell. It is different from the violation judging unit in that it controls 6-1.

The violation determining unit 412 sends a signal indicating whether or not to replace the last ATM cell to the cell control unit 6-1 in addition to the signal of the discard request. At the end, a request to replace (replacement request “1”) is sent as a signal to be replaced with the ATM cell. For example, the violation determination unit 412 sends the VPI stored in the violation record “0” and the power violation unit 5 When the ATM cell of / VCI is determined to be a violating ATM cell, a replacement request “1” for replacing the violating ATM cell with the last ATM cell is output to the cell control unit 6-1. I have.

Here, the violation determination unit 4-2 shown in FIG. 11 includes a control unit 43-2 instead of the control unit 43, and the control unit 43-2 is the same as the control unit 43. In addition to performing reading, writing, and the like to the violation section 5, it also sends a replacement request to the cell control section 6-1.

When the control unit 43-2 receives the signal "1" from the arithmetic unit 41 indicating that the ATM cell is in violation, and the violation record unit 5 holds the violation word Ηϋ "0" Then, it is determined that it is the first violation AΤM cell that violates among the plurality of AΤΜcells in the PDU, and the replacement request “1” is transmitted to the sensor control unit 6-1.

The processing performed on the succeeding ATM cell following the violating ATM cell is performed in the same manner as in the polishing apparatus 1 (see FIG. 1). —2 also outputs a discard request “1” to the senor control unit 6-1 to discard the subsequent ATM cell.

Next, the cell control unit 6-1 replaces the first offending ATM cell in the PDU with the last ATM cell and discards subsequent ATM cells. As shown in FIG. It has a section 6 1 and a replacement section 6 2.

The discard unit 61 shown in Fig. 12 is the discard request sent from the violation determination unit 42. Upon receiving “1”, the ATM cell is replaced with an empty cell. When the replacement unit 6 2 receives the replacement request “1” from the control unit 43-2, the replacement unit 6 2 sets the PT 3 bit of the offending ATM cell to “0”. It is rewritten as "1".

Hereinafter, the operation of the polishing apparatus 112 configured as described above will be described with reference to FIG. 13A to 13C are the same as FIGS. 6A to 6C, and the description of the views is omitted.

Also, the following description is based on the premise that the ATM cell (c 4) of the ATM cells (c 1 to c 8) is violent and violated.

When the ATM cell (c 1) is strongly input to the policing device 1 and 2 at the timing t1, the VPZVC recognizing unit 2 The VPI / VC I which has been detected is determined as the violation determining unit, similarly to the policing device 1 according to the embodiment. The frame recognition unit 3 transmits the PT3 bit “0” in the header of the input ATM cell.

The violation judging unit 4-2, like the violation judging unit 4 (see FIG. 4), judges a violation of an input ATM cell based on VPI / VCI, PT3 bit “0”, and the like.

Here, the processing operation of the violation determination unit 4-2 is the same as that of the violation determination unit 4 (see FIG. 4) according to the embodiment, and is the same as that of FIG. 7 used in the description of the polishing apparatus 1 of the embodiment. Therefore, the detailed description is omitted. In step S7 in FIG. 7, a replacement request “1” is output instead of the discard request “1”. Therefore, the violating ATM cell (c 4) The ATM cell (cl-c 3; FIG. 13 (a)) input to the policing device 1-2 before being input to the power policing device 1-2 is the policing device 1 Is performed in the same manner as described above, and transmitted to the ATM switch side. Also, when the ATM cell (c 4) is input to the policing device 1-2 at the evening timing t 4, the VP IZVC I and the PT 3 bit are detected in the same manner as the above ATM cell (c 1). Violation judging unit 4-2 The arithmetic unit 41 of the liquid-bagged type performs arithmetic operation.

When the calculation result of the calculation unit 41 indicates a violation, the calculation unit 41 outputs a signal “1” indicating the violation to the control unit 43-2, and the control unit 43-2 determines that the calculation result is in violation The violation record held for the VP I / VC I of the ATM cell (c 4) is read from the violation recording unit 5 (from the YES route of step S 4 shown in FIG. 7). In step S5), it is determined whether the violation record is "1" (step S6). Violation Βϋ Since it is “0”, the control unit 43-2 rewrites the violation “0” held for the VP I / VC I of the ATM cell (c 4) into the violation record “1”. The replacement request “1” is output to the sensor control unit 6-1 (from the YES route in step S6 to step S7).

The cell control unit 6-1 rewrites the PT3 bit of the ATM cell (c4) sent from the replacement unit 62 'delay unit 7 from “0” to “1”, thereby obtaining the illegal ATM cell (c4 ) Is replaced by the last ATM cell and sent to the ATM switch. Then, in the violation determination processing for the succeeding ATM cell (c5) following the violating ATM cell in the same PDU, the arithmetic unit 41 outputs a signal “0” indicating that the power is not violated, and the control unit 43-2- The violation record stored for the VP I / VC I of the ATM cell (c 5) is read from the offense section 5 (step S 11 from the NO route of step S 4) o

The control unit 43-2 determines whether or not the offending statement ^ is "1" (step S12). Since the offending record is "1", the ATM cell (c5) violates the last ATM cell. Judgment is made (step S8 from the YES route in step S12).

Here, since the PT3 bit of the subsequent ATM cell (c5) received from the frame recognizing unit 3 is "0", the control unit 43-2 determines that the subsequent ATM cell (c5) is the last ATM cell. It is determined that the condition does not apply, and a discard request is output to the cell control unit 6-1 (from the NO route in step S8 to step S10).

Then, the subsequent ATM cell (c5) is replaced by an empty cell and discarded in the discarding unit 61 of the cell control unit 6-1. The subsequent ATM cell (c6) in the same PDU is discarded by the cell control unit 6-1 in the same manner as the subsequent ATM cell (c5). Next, at the timing t7, the last ATM cell (c7) in the same PDU input to the policing device 1-2 is sent to the above-mentioned subsequent ATM cells (c5, c6) by the violation determination unit 42. However, since the PT3 bit of the last ATM cell (c7) received from the frame recognition unit 3 is “1”, the control unit 4 Rewrite the violation record “1” held for the VP I 7VC I of cell (c 7) with the violation record “0” (from the YES route in step S 8). Step S 9).

Also, when the ATM cell (c 8) in the next PDU is input, the same processing as described above is performed by the policing device 112, and the ATM cell of another VPI / VCI is also violated. When a cell force is detected, the violating ATM cell is replaced with the last ATM cell and transmitted to the ATM switch side. The operation is the same as described above, so detailed description will be omitted.

As described above, according to the polishing apparatus according to the second modification of the embodiment of the present invention, similarly to the polishing apparatus 1 according to the embodiment, the efficiency of the ATM network can be improved, and the PDU is transmitted to the receiving side. Can recognize the boundary of

As a result, for example, the policing device 1-2 discards the offending ATM cell (c4) shown in Fig. 13 without replacing it with the last ATM cell, and discards the subsequent ATM cells (c5 to c7). It is assumed that ATM cells (cl to c3, c8) are transmitted to the ATM network.

At the receiving side, when the ATM cell (cl to c3, c8) is received and the ATM cell (c3) cannot be identified as the last ATM cell by the receiving side, the next P The boundary between the ATM cells (c8-) in the DU cannot be recognized, and a situation may arise where two IP frames cannot be reconfigured on the receiving side.

Therefore, according to the policing device 112 of the present invention, the violating ATM cell is replaced with the last ATM cell and transmitted, so that the receiving side can reconfigure the IP frame mounted on the next PDU. Easier to do.

By the way, in the policing apparatus according to the second modification of the embodiment of the present invention, instead of the violation recording section 5, the violation recording section 5a for holding the VCI of the violating ATM cell is used, and the polishing apparatus 1-2 is used. a can also be constructed (see Figure 1).

Here, the policing device 1-2a has a violation determination unit 4-2a instead of the violation determination unit 4, and the violation determination unit 4-2a is compared with the violation determination unit 4-2. (1) Write the VCI of the violating ATM cell to the violation recording section 5a. (2) When processing the subsequent ATM cell, search whether it is stored in the violation recording (VCI) force violation recording section 5a. When processing an ATM cell, the VCI of the last ATM cell is deleted from the violation recording section 5a. For this reason, the violation judging unit 4-2a has a control unit 43-2a instead of the control unit 43-2 (see FIG. 11). It differs from the control unit 43-2 in that it also performs

The operation of the violation judging unit 4-2a of the polishing apparatus 1-2a is the same as the operation of the polishing apparatus 1-2 using FIG. 7, and the control is performed in steps S5 and S11. The part 43-2a is designed to search and read the VCI power of the ATM cell to be processed << the held power, the offending word >> part 5a.

In step S7 shown in FIG. 7, the control unit 43-2a writes the VCI of the offending ATM cell to the offending unit 5a as a process for the offending ATM cell. Further, in step S9 shown in FIG. 7, the control unit 43-2a outputs the discard request to the cell control unit 6-1 and deletes the VCI of the offending ATM cell in the offending unit 5a. It is supposed to.

Like the policing device 1-2, the policing device 1-2a can improve network efficiency and contribute to facilitating the reconfiguration of the next PDU on the receiving side. it can.

Similarly to the policing device according to the first modification of the embodiment of the present invention described in the above (a-1), when the discard setting is performed by the maintenance person of the ATM network, the first PDU is started. The policing device 1-2b according to the second modification of the embodiment of the present invention in which the ATM cell is replaced with the last ATM cell, comprises a violation determining unit 4-2b instead of the violation determining unit 4-2. (See Figure 1).

Here, the violation judging section 4-2b performs a discarding process on the violating ATM cell according to the setting of the ATM network maintenance person, and as shown in FIG. In addition to the control section 43-2b, it also has a setting information holding section 44.

The control unit 43-2b performs a process similar to that of the control unit 42-2 in accordance with the setting information held in the force setting information holding unit 44 so as to determine the process to be performed on the violating ATM cell. Has become.

For example, the control unit 43-2b outputs a replacement request to the cell control unit 6-1 in response to the violating ATP cell of the VP I / VC I set to be discarded, and outputs the replacement request to the subsequent ATM cell. On the other hand, a discard request is output to the cell control unit 6-1. In addition, the control unit 43-2b performs a passing process on a violating ATM cell of VPI ZVCI not set to be discarded or a subsequent ATM cell.

Note that FIG. 9 does not show that the replacement request is output from control section 43-2b to cell control section 6-1.

The operation of the policing device 1-2b is the same as that of the flowchart shown in FIG. 7, in which a replacement request is output instead of a discard request in the force step S7.

Even in such a policing device 1-2b, the discard of the last ATM cell can be suppressed, and the receiving side can recognize the boundary of the PDU, and the IP frame mounted on the next PDU can be reconstructed. It will be easier.

(a-3) Description of Third Modification of One Embodiment of the Present Invention

Next, a description will be given of a polishing apparatus according to a third modified example of the embodiment of the present invention with reference to FIG. 1, but a polishing apparatus according to a third modified example of the embodiment of the present invention shown in FIG. 1-3 is different from the polishing apparatus 1 according to the embodiment in that it is configured so that the last ATM cell force is not discarded.

For example, as in the case of the policing device 1, the policing devices 13 and 13 perform the discarding process on the nonconsecutive violating ATM cells in the PDU and also perform the discarding process on the subsequent ATM cells. In addition to passing the last ATM cell without discarding the last ATM cell, the last ATM cell is not discarded even if the last ATM cell is a violating ATM cell. Through the device. For this reason, the policing device 1-3 has a violation judging section 4-3 instead of the violation judging section 4 (see FIG. 1). The violation judging section 4-13 performs a violation judging process for each ATM cell. Is different from the violation judging unit 4 in that the discard request is not output to the cell control unit 6 as the process performed on the last ATM cell.

Here, the violation judging section 43 has a control section 43-3 instead of the control section 43 (see FIG. 4), and the control section 43-3 discards the last ATM cell. The difference from the control unit 43 is that a discard request is not output to the senor control unit 6.

The operation of the policing device 13 configured in this way depends on the operation of the policing device 1. Among the steps of the flowchart shown in FIG. 7, between steps S6 and S7, the control unit 43-3 determines whether or not the last ATM cell exists. If the ATM cell does not correspond to the last ATM cell (the PT3 bit is not “1”), the violation record “1” is written in the violation recording unit 5 and the discard request “1” is sent to the cell control unit 6. (Step S7). On the other hand, if it corresponds to the last ATM cell, the control unit 43-3 does not output the discard request “1” to the cell control unit 6 (step S13). That is, the last ATM cell passes through the device and is sent to the ATM switch side.

Further, in step S9 shown in FIG. 7, the control unit 43-3 does not output the discard request to the cell control unit 6, but records the violation word “1” held in the violation unit 5 in violation. Rewrite it to "0" (from the YES route in step S8 to step S9).

In this way, the last ATM cell is sent to the ATM switch without being discarded.

As described above, also in the policing devices 13 and 13, the discard of the last ATM cell can be suppressed, the receiving side can strongly recognize the boundary of the PDU, and the receiving side can easily reconstruct the next IP frame.

By the way, also in the polishing apparatus according to the third modification of the embodiment of the present invention, instead of the violation recording section 5, a policing apparatus 1-3a using a violation recording section 5a that holds the VCI of a violated ATM cell is used. Can also be configured.

In addition, the policing device 1-3 a has a violation judging unit 4-3 a instead of the violation judging unit (see Fig. 1), and the violation judging unit 4-3 a is compared with the violation judging unit 4-3. Then, (1) write the VCI of the violating ATM cell to the violation recording section 5a, and (2) check whether the violation record (VCI) is retained in the violation recording section 5a when processing the subsequent ATM cell. Search, (3) When processing the last ATM cell, the VCI of the last ATM cell is deleted from the offending part 5a.

For this reason, the violation judging section 4-1 3a includes a control section 43-3a that performs the same processing as the control section 43-3 and performs the above steps 1 to 3 (see FIG. 4).

The operation of the violation judging unit 4-3a of the policing device 113a is the same as the operation of the policing device 1-3, but the steps S5 and S11 shown in FIG. In this case, the control unit 43-3-a searches and reads out the force held by the VCI force of the ATM cell to be processed and the violation recording unit 5a.

Similarly to the control unit 43-3, the control unit 43-3a determines whether or not the last ATM cell is a force between step S6 and step S7 shown in FIG. If the cell does not correspond to the last ATM cell, a discard request is output to the cell controller 6 and the offending word EH (VCI) is written to the offending word unit 5a (step S7). If the cell corresponds to a TM cell, the cell control unit 43-3a does not output a discard request (step S13).

Further, in step S9 shown in FIG. 7, the control unit 43-3-a deletes the VCI of the violating ATM cell from the violating unit 5a without outputting the discard request. I have.

In such a policing device 113a, as in the policing device 113a, it is possible to suppress the discard of the last ATM cell and to recognize the boundary of the PDU on the receiving side. It becomes easier for the receiving side to reconstruct the next IP frame. Also, like the policing device 1-1 according to the first modification of the embodiment described in (a-1) above, if the discarding is set by the maintenance person of the ATM network, The policing device 1-3b according to the third modification of the embodiment of the present invention, which passes an ATM cell, includes a violation determination unit 4-3b instead of the violation determination unit 4-3 ( refer graph1) .

Here, the violation judging unit 4-3b performs a discarding process on the violating ATM cell in accordance with the setting of the maintenance person of the ATM network, and as shown in FIG. Instead of 3, it has a control section 4 3-3 b and a configuration information holding section 4.

The control unit 43-3b performs the same process as that of the control unit 43-3-3 according to the setting information held in the force setting information holding unit 44, and performs the process to be applied to the violating ATM cell. I am to judge.

In other words, even if the arithmetic unit 41 determines that the ATM cell is in violation, the control unit 43-3-b sends the cell control unit 6 to the cell control unit 6 unless it is set to be discarded by the maintenance person of the ATM network. It does not output the discard request "1". The operation of the policing device 113b is the same as that of the policing device 1-1 (see FIG. 10), and although not shown in the flowchart shown in FIG. The control unit 43-3b determines whether or not it is the last ATM cell between the steps or between step S6-11 and step S7, and corresponds to the last ATM cell. If not (the PT3 bit is not "1"), the violation word "1" is written in the violation recording unit 5 and a discard request is output to the cell control unit 6 (step S7). On the other hand, if the cell is the last ATM cell, the control units 43-13b do not output a discard request to the cell control unit 6 (step S13). That is, the last ATM cell passes through the device.

Further, in step S9 shown in FIG. 10, the control unit 43-3b does not output the discard request to the cell control unit 6 but changes the violation record “1” held in the offense statement 3 ^ unit 5 to output the discard request. Rewrite the counter to "0" (from the YES route of step S8-1 to step S9

) o

The last ATM cell is sent to the ATM switch without being discarded. Even with such a policing device 11-3b, it is possible to suppress the discard of the last ATM cell, enable the receiving side to recognize the boundary of the PDU, and allow the receiving side to transmit the next IP frame. It is easier to reconfigure.

It should be noted that the policing device 1-3b can also be configured using the violation recording unit 5a that holds the VCI of the violating ATM cell as a violation record. The detailed explanation is the same as or the same as the above, and is omitted.

Incidentally, FIG. 21 is also a view showing a polishing apparatus according to a third modification of the embodiment of the present invention. The polishing apparatus 1-3 c shown in FIG. 21 is similar to the polishing apparatus 13 shown in FIG. It does not discard the last ATM cell, but discards the next ATM cell of the same VP I / VC I.

For this reason, as shown in FIG. 21, the policing apparatus 1-3 c includes a violation determining section 4-1 3c in place of the violation determining section 13-1, and also includes a hold recording section 12. For example, if the last ATM cell is a violating ATM cell, the last ATM cell is sent to the ATM switch side without being discarded by the policing device 13c, and the next ATM cell of the same VP IZVC I is sent to the ATM switch. It is to be discarded. Here, the hold section 12 holds information indicating that the discarding process for the last ATM cell has been held (hold record) for each VPI / VCI. For example, the last violation A The hold record “1” indicating that the process has been held for the TM cell or the hold “0” without the hold is held.

The violation judging unit 4-3c does not output the discard request to the cell control unit 6 to perform the discarding process on the last ATM cell, as in the case of the violation judging unit 4-3. In contrast, a pending word “1” indicating that the processing has been suspended is written to the pending word unit 12, and the ATM cell of the same VPI / VCI input next to the last ATM cell is written. The discard request is sent to the senor control unit 6, and the pending word “1” of the corresponding VP1 / VCI is rewritten to “0”.

For this reason, the violation judging unit 4-3c has a control unit 43-3c instead of the control unit 43-3 (see FIG. 4). In addition to performing the processing performed in 3-3, the hold section writes and reads the hold record to the section 12 and refers to the hold record held in the hold section 12 to request a discard. Is output to the cell controller 6.

The operation of the policing device 1-3c configured as described above is performed by the policing device 1-3 and the policing device 1-3 according to the above-described embodiment, unless the hold word “1” is held in the hold word portion 12. The same is true.

If the last ATM cell is determined to be a violated ATM cell by the arithmetic unit 41 when the violation record “1” is not recognized in the violation unit 5, the control unit 4 3—3 c does not send the discard request to the cell control unit 6, but rewrites the pending word of the corresponding VPI / VCI to “0” and “1” in the pending recording unit 12.

On the other hand, when determining the processing to be performed on the input ATM cell, the control unit 43-3-c determines whether the hold recording unit 12 holds the hold record “1”. Is output, and the hold record “1” held in the hold section 12 is released to “0”.

Therefore, the last ATM cell is sent to the ATM switch without being discarded. Such a policing device 1-3. For example, if the last ATM cell is discarded, the two sides caused by the receiver's inability to recognize the boundary between the two PDUs The situation where the IP frame cannot be reconstructed can be avoided by sending the last ATM cell without discarding it, and the receiving side can easily reconstruct the IP frame mounted in the PDU.

In addition, in the above policing device 1-3c, the example in which the ATM cell to be discarded is one based on the hold word "1" held in the hold recording unit 12 has been described. All ATM cells of the incoming PDU (one PDU) may be discarded.

For example, referring to FIG. 6 (a) as an example, since the ATM cells (cl to c7) are mounted on the same PDU, the reserved word 3 に “1” is held in the reserved word 12 at the timing T1. If so, all ATM cells (cl to c7) are discarded.

According to the policing device configured in this manner, similarly to the policing device 1-3c, the boundary of the PDU can be recognized on the receiving side, and all ATM cells in the next PDU following the last ATM in violation are transmitted. Discarding can surely improve network efficiency.

The policing device 1-3 c can also be configured by using the violation recording unit 5 a holding the VCI of the violating ATM cell instead of the violating unit 5, in which case the control unit 43-3 c The ability to write and read the VCI of the offending ATM cell to the recording unit 5a, and the detailed description thereof, are the same as or the same as those of the control unit 5a of the policing device 1a, and will not be described.

(a-4) Description of fourth modified example of one embodiment of the present invention

Next, a description will be given of a polishing apparatus according to a fourth modified example of the embodiment of the present invention with reference to FIG. 1, but a polishing apparatus according to a fourth modified example of the embodiment of the present invention shown in FIG. 1-4 is a record of a violation, triggered by the ATM cell (hereinafter referred to as the first ATM cell) or the last ATM cell located at the head of the PDU as compared with the policing device 1 or the like according to the embodiment. The violation record "1" held in Part 5 can be rewritten to "0".

For example, while the policing device 14 applies the discarding process of the violating VPI / VCI to the subsequent ATM cell, the last ATM cell cannot be detected or input by the policing device 14. Policing equipment 114 When the first ATM cell of the same VP IZVC I in the next PDU is triggered, the previous violation record is released and multiple ATM cells in the next PDU are identified.

Here, the policing device 1-4 uses the second bit (hereinafter referred to as PT 2 bit) of the P in addition to the 3 bits of PT to identify the head ATM cell.

Table 1 below shows an example of the data structure of the PT3 bit and PT2 bit for distinguishing the first ATM cell and the last ATM cell. As shown in Table 1 below, the PT3 bit and PT2 bit are used. An example will be described in which the ATM cell with a bit power of “01” indicates that it is the first ATM cell.

Table 1 Data configuration example of 3 bits PT and 2 bits PT

In Table 1 above, an intermediate ATM cell is an ATM cell other than the first ATM cell and the last ATM cell among a plurality of ATM cells in one PDU.

For this reason, the policing devices 1-4 include a frame recognition unit 3-1 in place of the frame recognition unit 3 and a violation determination unit 4-1-4 in place of the violation determination unit 4. (refer graph1)

Here, the frame recognizing unit 3-1 detects the PT3 bit and the PT2 bit, and outputs the detected PT2 bit and PT3 bit to the violation determining unit 414. I have.

On the other hand, the violation judging unit 4-4 performs the processing performed by the violation judging unit 4 and cancels the violation record held in the violation recording unit 5 in response to the first ATM cell. Violation judging section 4-4 has control section 43-4 instead of control section 43. If the violation record “1” is maintained for the VP I / VC I of the first ATM cell at the time of the first ATM cell violation determination process, the control unit 43-4 will output the violation record “1”. Is changed to the violation record “0” (the offending word is canceled), and is different from the control unit 43.

The control unit 43-4 identifies the first ATM cell, the intermediate ATM cell, and the last ATM cell based on the PT3 and PT2 bits sent from the frame recognition unit 3-1. You can do it.

The operation of the polishing apparatus 1-4 is the same as that of the polishing apparatus 1 (see FIG. 7), and although not shown in the flowchart of FIG. 7, the YES route of step S12 and the step S8 The control unit 43-4 determines whether or not the cell is the head ATM cell. If the cell does not correspond to the head ATM cell, the control unit 43-4 determines whether or not the cell is the tail ATM cell. On the other hand, if it is the first ATM cell, the control unit 43-4 rewrites the violation record “1” held in the violation recording unit 5 to “0”. Then, the processing shifts to the next ATM cell violation determination processing.

If the first ATM cell is a violating ATM cell and the violation record “1” is violently stored in the violation recording unit 5, the control unit 43-1 does not delete the violation record “1” without deleting it. The control unit 43-4 may determine whether or not it is the first ATM cell between the YES route of step S6 and the step S8 in FIG. 7, for example. If it corresponds to the first ATM cell, it outputs a discard request “1” to the cell controller 6. On the other hand, if it does not correspond to the first ATM cell, the control unit 43-4 determines whether it is the last ATM cell (step S8).

On the other hand, assuming that the PT2 bit of the header of the ATM cell (cl to c8) shown in Fig. 6 (a) can be used to identify the first ATM cell, the operation of the policing device 1-4 will be described. Like the policing device 1, the policing devices 1 to 4 discard the violating ATM cell (c 4) input at the evening T1 and hold the violation record “1” in the violation recording unit 5. . Subsequent ATM cells (c5 to c6) are discarded in the same manner as the offending ATM cell (c4).

Here, for example, assuming that the last ATM cell (c7) shown in FIG. 6A is not input to the policing devices 1-4, the policing device 1 at timing T8. When the first ATM cell (c 8) is inputted in the step 4, the offending word “1” is held in the offense recording unit 5 (not shown). Then, when the top ATM cell (c 8) is input, the policing device 1-4 releases the violation record “1” stored in the violation recording unit 5 (not shown).

As described above, according to the policing device 114 according to the embodiment of the present invention, the efficiency of the network can be improved as in the policing device 1 of the embodiment, and the last ATM cell or the first ATM cell can be improved. As a result, the violation word "1" can be changed to "0" for fail safe, so that safe policing can be performed. Note that, similarly to the polishing apparatus 1-1 according to the first modified example of the embodiment of the present invention, the VPI / VCI set to be discarded by the maintenance person of the ATM network is also used for the polishing apparatus 1-4. In this case, the policing device 114 is further provided with a setting information holding unit 44, and the control unit 43 -4 determines the processing to be performed on the violating ATM cell or the like in accordance with the information held in the setting information holding unit 44.

(a-5) Description of Fifth Modification of One Embodiment of the Present Invention

Next, the polishing apparatus 1-5 according to the fifth modified example of the embodiment of the present invention shown in FIG. 14 is different from the polishing apparatus 1 according to the above-described embodiment in that the first ATM cell force is violated. If the cell is an ATM cell (hereinafter sometimes referred to as a head violation ATM cell), the head violation record indicating that the cell is a head ATM cell power violation ATM cell is stored, and based on the head violation record, The subsequent ATM cells are discarded.

Therefore, as shown in FIG. 14, the policing device 1-5 includes a frame recognition and recognition unit 3-1 in place of the frame recognition unit 3, and a violation determination unit 4-5 in place of the violation determination unit. In addition, it has a head cell violation recording section 8.

Here, the first cell violation recording section (first information holding section) 8 holds a violation record indicating whether or not the first ATM cell is a violating ATM cell for each VPI ZV CI. For example, as in the case of the violation recording unit 5 shown in FIG. 3, a top violation record is held for each VCI in a predetermined area of the memory. Here, for example, the first violation record “0 (no violation record in the first ATM cell)” or the first violation record “1 (the first ATM cell has a violation record)” is stored in the first cell violation statement section 8. It has become.

When the first ATM cell corresponds to the violating ATM cell as compared with the violation determining unit 4, the violation determining unit 415 writes the first violation word BH “1” to the first cell violation recording unit 8, and the first cell violation. Based on the first violation record "1" held in the unit 8, a discard request is output to the cell controller 6 in order to discard the subsequent ATM cells following the first offending ATM cell in the PDU. ing.

The violation determining unit 415 uses the frame recognition unit 3-1 to determine the cell position of the ATM cell in the PDU (first, middle, last) based on the PT3 and PT2 bits sent from it. ) Can be recognized.

For this reason, the violation judging unit 4-5 has a control unit 43-5 instead of the control unit 43 (see FIG. 4), and the control unit 43-5 is the first ATM cell and the violating ATM cell. At this time, the control unit 43 differs from the control unit 43 in that the control to the cell control unit 6 is performed on the subsequent ATM cell based on the previous II violation record “1” held in the first cell violation unit 8.

For example, the control unit 43-5 outputs a discard request to the cell control unit 6 for an ATM cell subsequent to the VP I / VC I whose head violation record "1" is held.

The head violation record "1" can be rewritten to the head violation record "0" by the control unit 43-5, triggered by the last ATM cell.

On the other hand, if the ATM cell other than the first ATM cell is a violating ATM cell, the cell control unit 43-5 writes the violation record "1" to the violation recording unit 5 and writes the violation record " Processing such as rewriting (cancelling) “1” to “0” is performed.

According to the policing device 1-5 configured as described above, when the violation determining unit 415 determines that the first ATM cell is a violating ATM cell, it outputs a discard request “1” to the cell control unit 6. In addition, write the first violation word Hi¾ “1” to the first cell violation recording section 8. The violation judging unit 4-5 is the first violation record factory stored in the first cell violation recording unit 8. Based on “1”, it outputs a discard request “1” to the cell control unit 6 in order to perform discard processing on the subsequent ATM cell following the top offending ATM cell.

As described above, according to the policing device 1-5 according to the fifth modified example of the embodiment of the present invention, all the ATM cells of the PDU are discarded, so that the same as the policing device 1 according to the embodiment is performed. In addition, the efficiency of the ATM network can be improved.

Further, the policing device 1-2 according to the second modification of the embodiment (a-2) of the present invention is similar to the policing device 1-5 in that the first ATM cell is a violating ATM cell. At some point, it can be configured to discard all the ATM cells from the beginning to the end in the PDU.

If the offending ATM cell is not the first ATM cell, the offending ATM cell is replaced by the last ATM cell.

Here, when the first ATM cell is discarded, replacement with the last ATM cell (rewriting PT3 bit “0” to “1”) is not performed. With this configuration, it is only necessary to discard all ATM cells in the same PDU and not to send out extra ATM cells to the ATM network, thereby improving the efficiency of the network.

Further, as in the policing device 111 according to the first modification of the embodiment (a-1) of the present invention, the ATM of the VPI / VC I discarded by the ATM network maintenance person is set. Even if only cells are discarded, the ATM cells in the same PDU need not be discarded and unnecessary ATM cells are not sent to the ATM network, thereby improving network efficiency.

(a-6) Description of Sixth Modification of One Embodiment of the Present Invention

Next, a polishing apparatus 16 according to a sixth modification of the embodiment of the present invention shown in FIG. 15 is different from the polishing apparatus 1 according to the embodiment in that an ATM cell is provided for each VP I / VC I. It determines whether the upper layer is handling frame-structured data (PDU) and discards it.

For example, the policing device 1-6 performs an individual violation determination process on ATM cells that do not handle PDUs, and discards them when they violate. On the other hand, the policing device 1-6 sends A to the offending ATM cell handling the PDU. The same processing as that performed on the violating ATM cell is performed on the TM cell as in the policing apparatus 1.

For this reason, as shown in FIG. 15, the policing device 116 includes a violation determination unit 4-6 instead of the violation determination unit 4 (see FIG. 1) and a classification unit 9 as shown in FIG. ing.

Here, the type recording unit (type holding unit) 9 has 1 cell in Hatcho? 011 is held for each VPI / VC I, and can be configured using a memory, RAM, or the like. For example, the violation recording unit 5 shown in FIG. Similarly to the above, the type information is stored in a predetermined area of the memory for each VCI. For example, the type information “1 (handles PDU)” or the type information “0 (does not handle PDU)” is stored in the force type information language unit 9.

Note that the type information “1” and “0” are added by the control device or the like outside the policing device 16 every time the VC power is established.

The violation judging unit 4-6 differs from the violation judging unit 4 in that the violation judging unit 4-6 performs an individual violation judging process on ATM cells that do not handle PDUs, and includes a control unit 43-16 instead of the control unit 43. (See Figure 4).

Here, the control unit 43-6 refers to the type information held in the type word ^ unit 9 to determine the processing to be performed on the ATM cell of the same VP I / VC I following the violating ATM cell. Is different from the control unit 43.

For example, when an ATM cell that does not handle a PDU is violated, the control unit 43-6 determines the ATM cell power of the same VPI / VC I input to the policing device 1-6 after the violating ATM cell. If the operation unit 41 determines that the cell is violated, a discard request is output to the cell control unit 6. On the other hand, if the cell is not the violating ATM cell, the cell is passed through the apparatus.

The operation of the polishing apparatus 1-6 configured as described above will be described with reference to FIGS. 16 (a) to 16 (c).

Note that FIG. 16 focuses on ATM cells (c4 to c8, d1 to d3) of two VPI / VC I (c and d) in order to explain the operation of the policing device 16. It is a diagram for explanation, and the ATM cells (c4 to c8) of VP I / VC I (c) Handles PDUs.

Here, it is assumed that the ATM cell (c7) among the ATM cells (c4 to c8) is the last ATM cell of the PDU, and “0” and “1” in FIG. Means PT 3 bit.

FIG. 16B shows the type information “0” or the type information “1” held in the type recording unit 9, and FIG. 16C shows each ATM cell (c) in the policing device 1-6. 4 to c8 and d1 to (! 3).

The policing device 16 sets the timings A4 and A5 for passing non-violating ATM cells (c4, c5, dl) input to the policing device 1_6 in the evenings A1 to A3. Discard the entered violating ATM cell (c 6, d 2).

Here, the policing device 116 discards the ATM cell (c 6) and also discards the violation record “1” in the violation recording unit 5. Therefore, the ATM cell (c 7) sent to the policing device 16 after that is discarded, and the violation record “1” stored in the offense section 5 is rewritten to the offense word HH “0”. Can be

On the other hand, the ATM cell (d 3) sent to the policing device 1-6 after the violating ATM cell (d 2) is not discarded if the violation judging unit 4-6 determines that there is no violation. Pass through.

As described above, according to the policing apparatus 1-6 according to the embodiment of the present invention, at the entrance of the ATM network, the ATM cell handling PDU and the ATM cell not handling PDU in the upper layer of the ATM network. Policing can improve the efficiency of ATM networks.

(a-7) Description of a seventh modified example of the embodiment of the present invention

Next, the policing device 117 according to the seventh modification of the embodiment of the present invention shown in FIG. 17 compares the policing device with a VP / VC I will be done separately.

For example, each time the policing device 117 resets the violation record “1” in the violation recording unit 5 (rewrites it to “0”), it counts up the count value of the corresponding VP I / VC I. I have. For this reason, as shown in FIG. 17, the policing device 117 has a violation determining unit 417 instead of the violation determining unit 4 and a counter (CTR) 10.

Here, the counter 10 holds the number of violations for each VPI / VCI in PDU units. In other words, the counter 10 counts each time the violation record “1” of the violation recording unit 5 is rewritten to “0”. The value is counted up.

On the other hand, the violation determination unit 4-7 performs control to count up the count value of the corresponding VPI / VCI stored in the counter 10 every time the violation record “1” stored in the violation recording unit 5 is reset. Differs from Violation Judgment Unit 4.

Here, the violation judging section 417 has a control section 43-7 instead of the control section 43 (see FIG. 4). The control section 43-7 has the violation stored in the violation recording section 5. Each time the record "1" is rewritten to the violation record "0", the control unit 43 controls the counter 10 so that the count value of the corresponding VPI / VCI held in the counter 10 is increased. different.

The operation of the polishing apparatus 117 configured as described above is the same as that of the polishing apparatus 1 according to an embodiment of the present invention. In the flowchart shown in FIG. It also rewrites the violation record held in the cell (rewrites “1” to “0”), outputs a discard request to the cell control unit 6, and controls the counter 10. Then, the count value of the corresponding VPIZVCI held in the count 10 is counted up.

As described above, according to the polishing apparatus 1-7 according to the seventh modified example of the embodiment of the present invention, similarly to the polishing apparatus 1 according to the embodiment, the efficiency of the ATM network can be improved, and the counter can be improved. The value is used as maintenance information for maintenance and operation of the ATM network by equipment maintainers / network maintainers.

(a-8) Description of Eighth Modification of One Embodiment of the Present Invention

Next, a description will be given of a polishing apparatus according to an eighth modification of the embodiment of the present invention with reference to FIG. 1 .The polishing apparatus 118 according to the eighth modification of the embodiment of the present invention will be described below. Compared with the policing apparatus 1-1 according to the first modification of the embodiment, when the ATM cell is violated, the setting of the ATM network maintenance person by VPI / VCI is performed. In accordance with, disposal, passing or evening ging is performed. Here, the evening gating process is a process of rewriting a CLP bit (hereinafter, referred to as a CLP bit) in a header of an ATM cell from “0” to “1”.

For this reason, the policing device 1-8 includes a violation determination unit 4-8 instead of the violation determination unit 4-1 and a cell control unit 6-2 instead of the cell control unit 6 (see FIG. 1). ).

Here, the violation judging unit 4-8 performs the processing to be applied to the violating ATM cell and the succeeding ATM cell following the discard processing, pass-through processing, and tagging set for each VP I / VC I by the maintenance person of the ATM network. Unlike the violation judging unit 4-1 in that any one of the processes is judged, the control unit 43-11 is provided instead of the control unit 431, and the setting information holding unit 44-1 is used instead of the setting information holding unit 44. Has one.

The setting information holding unit 44-1 holds information indicating processing to be performed on violating ATM cells set by the ATM network maintainer for each VPI / VCI, and is configured using a memory, a RAM, or the like. For example, similarly to the violation recording section 5 shown in FIG. 3, the setting “01”, which should be discarded for a violating ATM cell, in a predetermined area in the memory for each VC I, for example, The setting "00" to be tagged and the setting "10" to be tagged are retained.

Information indicating processing to be performed on such violating ATM cells is added by a control device or the like outside the policing device 118 every time a VC force is established.

On the other hand, the control unit 43-8 refers to the information held in the setting information holding unit 44-1 for the violating ATM cell, as in the case of the control unit 43-1. Is determined.

For example, as a process to be performed on an ATM cell that violates the setting information storage unit 44-1, if the information of “10” of the eveninging process is retained, an eveninging request is output to the cell control unit 6-2. Te

On the other hand, the cell control section 6-2 has a tagging section 63 in addition to the disposal section 61 shown in FIG.

Here, the tagging section (loss allowance information adding section) 63 is sent from the control section 43-8. When the incoming tagging request is received, the tagging process is performed on the ATM cell determined to be in violation by the violation determination unit 4-8. The tagging section 63 rewrites the CLP bit in the header of the ATM cell to be subjected to the tagging process in response to the tagging request to “1” from “0”.

The operation of the polishing apparatus 1-8 according to the eighth modification of the embodiment of the present invention configured as described above will be described with reference to FIG. 19. Hereinafter, steps shown in FIGS. 7 and 10 in FIG. 19 will be described. The description of the numbers (step S1, etc.) is the same and will not be repeated. If the discard setting is not set, the control unit 48-8 determines whether the tagging is set further (steps S6-2, S8-3, S8-5 shown in FIG. 19) o

Hereinafter, an example will be described in which an ATM network (c1 to c8) shown in Fig. 6 (a) is violated vigorously and an evening maintenance process is performed by an ATM network maintenance person. In this case, the description is made on the assumption that the ATM cell (c 4) is a violently violating ATM cell, and “discard” shown in FIG. 6 (c) is replaced with “tagging”.

The ATM cells (cl to c3) input at the timings T1 to T3 pass through the inside of the policing device 1-8 by passing processing and are sent to the ATM switch side. Next, if the ATM cell input at timing T 4 shown in FIG. 6 (a) (c 4) is a violating ATM cell, the control unit 43-8 determines whether the discard setting has been made (see FIG. 19). In step S6-1 shown), since the discard setting has not been made, it is determined whether tagging has been set (step S6-2 from the NO list in step S6-1).

Then, the control unit 43-8 writes the violation record “1” in the offense statement 3 ^ unit 5 and outputs a tagging request to the senor control unit 6-2 (YE S 1 in step S6-2). Step S 6—3). When the tagging unit 63 receives the evening tagging request, the tagging unit 63 rewrites the CLP bit of the ATM cell (c4) to “0” and “1”.

Thereafter, the ATM cell (c4) in which the CLP bit has been rewritten is transmitted through the ATM switch or the like to the ATM network.

Next, in the violation determination processing of the succeeding ATM cell (c5) following the violating ATM cell (c4) in the same PDU, the control unit 43-8 controls the ATM cell (c 5) VPI ZV CI violation record and setting information storage 441-1 The information stored in the memory is read out (step S11A from the NO route of step S4). The control unit 43-8 determines whether the violation record is "1" (step S12), and since the violation record is "1", the ATM cell (c5) is the last ATM cell. (Step S8 from the YES route of Step S12). The control unit 43-8 recognizes the frame and, based on the PT3 bit “0” of the subsequent ATM cell (c5) received from the recognition unit 3, corresponds to the subsequent ATM cell (c5) and the last ATM cell. It is determined not to be performed, and it is further determined whether or not discarding has been set (step S8-2 from the NO list in step S8). Since the discard setting is not set, the control unit 43-8 determines whether the tagging is set further (from the NO route in step S8-2 to step S8-5).

Here, the control unit 43-8 outputs a tagging request to the cell control unit 6-2, indicating that the information held in the setting information holding unit 44-1 indicates the evening processing, and outputs the tagging request to the cell control unit 6-2 (step S Step 8-8 from the YES route.

Then, similarly to the ATM cell (c 4), the ATM cell (c 5) is subjected to tagging processing in the tagging section 63 and sent to the ATM switch.

The subsequent ATM cell (c 6) in the same PDU is also subjected to tagging processing by the cell controller 6-2 similarly to the subsequent ATM cell (c 5).

Next, in the violation determination processing of the last ATM cell (c 7) in the same PDU input to the policing device 1-8 at the timing T 7, the above-described subsequent ATM cell (c 5 , C6), but the PT3 bit of the last ATM cell (c7) received from the frame recognition unit 3 is "1". Rewrites the violation record “1” for the VP I ZVC I of the ATM cell (c 7) with the violation record “0” and outputs a tagging request to the cell control unit 6-2 (step S8-3). Step S 8-4) from the YE S route.

The ATM cell (c7) is also subjected to evening-gating processing by the cell control unit 6-2 and sent to the ATM switch side.

As described above, according to the polishing apparatus 1-8 according to the eighth modification of the embodiment of the present invention, the tagging process is performed in comparison with the polishing apparatus 11-1 according to the first modification of the embodiment. Violation of PDU Can be applied to ATM cells and subsequent ATM cells. Here, for example, if tagging processing is performed only on the violating ATM cell in the PDU, if the traffic fluctuation power <ATM network occurs in the ATM network, the ATM cell on which the eveninging processing has been performed is the ATM cell. There is a possibility that it will be discarded in the network, and if it is discarded, even if the subsequent ATM cell is sent to the receiver, the receiver will not be able to reconstruct the IP frame. Sending the subsequent ATM cell following the TM cell to the ATM network without performing the evening process degrades the efficiency of the ATM network.

According to the policing device 1-8, the subsequent ATM cell is subjected to evening ging as in the case of the violating ATM cell. Therefore, when the traffic fluctuation power occurs in the ATM network, the violation A Improve network efficiency because both TM cells and subsequent ATM cells can be discarded.

(a-9) Description of Ninth Modification of One Embodiment of the Present Invention

The description of each of the above embodiments (a) to (a-7) has been described on the assumption that the discarding process is performed in the case of a violation, but in the case of a violation, the evening processing is performed instead of performing the discarding process. It can also be configured to apply.

For example, each policing device 6 is configured to include a tagging unit 63 instead of the discarding unit 61, and each violation determination unit 4 etc. sends an eveninging request instead of a discarding request. I have.

Even with such a polishing apparatus 6 or the like, it is possible to improve the efficiency of the network by changing the evening processing to fi ¹ .

Further, even if the polishing apparatus according to the first modification of the embodiment of the present invention is configured to be able to perform evening ging processing, it is possible to improve the efficiency of the network and to follow the instructions of the maintenance person of the ATM network. You can perform safe evening ging processing.

Further, even if the polishing apparatus according to the fourth modified example of the embodiment of the present invention is configured to be able to perform the eveninging process, a fail-safe operation is triggered by the first ATM cell or the last ATM cell. The violation record “1” can be rewritten to the violation record “0”, so that safe policing can be performed.

Further, when the policing device according to the fifth modification of the embodiment of the present invention is configured to perform the tagging process, the tagging process is performed on all ATM cells in the same PDU. If it is applied, all the ATM cells subjected to the tagging process can be discarded when the traffic of the ATM network fluctuates, so that the efficiency of the network can be improved.

Further, even if the policing device according to the sixth modification of the embodiment of the present invention is configured to be able to perform eveninging processing, at the entrance of the ATM network, the PDU that handles PDUs in the upper layer of the ATM network is Policing of TM cells and ATM cells that do not handle PDUs can improve network efficiency.

Further, even if the polishing apparatus according to the fifth modification of the embodiment of the present invention is configured to be able to perform the eveninging process, the efficiency of the ATM network can be improved and the counter value can be maintained by the maintenance person of the apparatus.に It can be used as maintenance information for maintenance and operation of the ATM network by network maintainers.

(a-10) Description of a 10th Modification of the Embodiment of the Present Invention

The description of each of the above embodiments has been described on the assumption that the discarding process is performed in the case of a violation. However, instead of performing the discarding process in the case of a violation, an ATM cell is not used. In addition, the extension header may be configured to perform marking on the extension header. Here, the extension header is used to process an ATM cell in a device provided with a policing device. This is data of a predetermined length added to the TM cell. In a device provided with a policing device, writing and the like are performed on an extension header to process each ATM cell, and the data is written to the extension header. Each ATM cell is processed in the device based on the information stored.

Hereinafter, as an example, it is assumed that the ATM cell with the marking is discarded in the device by marking the extension header. The place where the ATM cell with the marking added to the extension header is discarded is outside the policing device.

For example, each policing device 6 etc. has a marking unit instead of the discarding unit 61, and each violation judging unit 4 etc. sends out a request for marking instead of a discarding request. I have.

Here, the marking part (violation information addition part) is a tagging part 63 or a replacement part 62. Is similar to, but marks the extension header.

The size of the extension header and the bit length to be marked depend on the design of the equipment.

With such a configuration, for example, by marking the extension header of the violating ATM cell in the PDU and the extension header of the succeeding ATM cell, the succeeding ATM cell as well as the violating ATM cell can be internally generated in the device. Since it is discarded, the efficiency of the ATM network can be improved as in the policing apparatus 1 according to one embodiment.

Further, even if the polishing apparatus according to the first modification of the embodiment of the present invention is configured to perform the marking process, it is possible to improve the efficiency of the network and secure the network according to the instruction of the maintenance person of the ATM network. Marking processing can be performed.

Further, even if the polishing apparatus according to the fourth modified example of the embodiment of the present invention is configured to be able to perform the marking process, a fail-safe operation is triggered by the first ATM cell or the last ATM cell. By violating 言, “1” can be rewritten to violation record “0”, and safe policing can be performed.

Further, when the policing apparatus according to the fifth modification of the embodiment of the present invention is configured to perform the marking process, if all ATM cells in the same PDU are to be discarded, the ATM network is used. This eliminates the need to send extra ATM cells to the network, thereby improving network efficiency.

Further, even if the polishing apparatus according to the sixth modification of the embodiment of the present invention is configured to be able to perform the masking process, the PDU is transmitted to the upper layer of the ATM network at the entrance of the ATM network. Policing of ATM cells to be handled and ATM cells that do not handle PDUs can improve network efficiency.

Further, even if the polishing apparatus according to the seventh modification of the embodiment of the present invention is configured to perform the masking process, the efficiency of the ATM network can be improved and the counter value can be reduced. It can be used as maintenance information for maintenance and operation of the ATM network by equipment maintainers and network maintainers.

(a-11) Description of 11th Modification of One Embodiment of the Present Invention

When the polishing apparatus according to the eighth modification of the embodiment violates the setting by the maintenance person of the ATM network, the polishing apparatus violates the discarding process, the passing process, or the tagging process. The description has been made on the assumption that the processing is applied to the TM cell and the subsequent ATM cell.

The system may be configured so that disposal processing, tagging processing, passage processing, and marking processing can be performed in combination.

A discarding unit 61, a tagging unit 63, and a marking unit are provided in the polisher so that these processes can be performed, and a violation judging unit is configured to output a discarding request, an evening ginging request, and a marking request to them. Is configured.

The violation determination unit is configured to include a control unit 43-8 in the same manner as the violation determination unit 418, but is set by the maintenance person of the ATM network held in the setting information storage unit. With reference to the information provided, the processing to be performed on the violating ATM cell and the subsequent ATM cell is determined, and a request signal for executing the set processing is discarded by the discarding unit 61, evening ging unit 6 3, Desired processing can be performed by transmitting to the marking unit.

The polishing apparatus configured as described above can also improve the efficiency of the ATM network.

Also, in the polishing apparatus and the like according to the first modified example of the embodiment described in the above (a-1) to (a-7), all or one of the discarding process, the tagging process, the passing process, and the masking process are performed. It is also possible to configure so that the processing of the section can be performed.

(b) Other

As described in detail above, the polishing apparatus and the polishing method of the present invention can be implemented by combining the respective embodiments described in (a) to (a-11).

In each of the above descriptions, the operation of the violation determination processing unit 4 has been described based on the flowchart. However, the polishing apparatus according to each embodiment uses the river shown in the flowchart!)? 。It is not limited to steps.

In addition, in each violation determination process, instead of performing a violation determination process every time an ATM cell force is input, a violation record relating to the VPI / VCI of the input ATM cell is read, and the read violation record is set to “1”. , The discarding process, the tagging process, and the masking process may be performed without performing the violation determination.

Further, the violation recording unit 4 according to an embodiment may be configured by a circuit shown in FIG. Table 2 below shows the relationship between input and output signals in the circuit shown in Figure 20. It is a table shown.

In Table 2 below, “0” in the column of the calculation result in the input signal means normal, and “1” means violation. “0” shown in the frame information column indicates that the cell is the first ATM cell or an intermediate ATM cell, and “1” means that the cell is the last ATM cell. Also, “0” shown in the violation record column indicates that there is no violation record, and “1” means that there is a violation record.

On the other hand, “0” shown in the discard column in the output signal means passage, and “1” means discard. In the column of offense 3 言, “0 0” means that the offense record is kept as it is, “01” means reset of the offense record, and “10” means the offense set. Means

Table 2 I / O signal examples

The violation determination unit that inputs and outputs the signals shown in Table 2 above can be configured using logic circuits (gates, RAMs, etc.).

In addition, the violation determining unit 4-3 according to the third modified example in the embodiment is the same as the one shown in Table 2 above. , 3 by replacing “1” with “0”, the logic circuit (gate, RAM Etc.).

Also, the violation determination unit according to the other embodiment can create the same one as shown in Table 2 above, which shows the correspondence between the number of input signals and the number of output signals, and implements a logic circuit (gate, RAM, etc.). It can be configured using.

Also, instead of separately providing the offending wording section 5, the setting information holding sections 44, 44-1, the first cell information holding section 8, the type recording section 9, etc., each information is stored in one holding section for each VPI / VC I. May be configured.

Further, the information held in the head cell information holding unit 8 or the like may be the VC I or the like of the head ATM cell.

Also, the discarding section 61, the replacing section 62, the evening section 63, and the marking section can be configured by one logic circuit instead of being separately provided.

Further, in FIG. 1, the violation recording unit 5 is arranged in parallel with the violation determination unit 4, but the arrangement position of the violation unit 5 is not limited to this. The same applies to the first cell violation part 8 and the type recording part 9.

Also, in the above description, the power described assuming the UPC ^ the amount of ATM cells sent from the ATM network to other networks as NPCs between networks. The present invention can also be applied to the case where the policing device is controlled, and the policing device according to each embodiment of the present invention can be provided in the DSU in the subscriber premises to control the transmission amount of the ATM cells.

In addition, as described in detail above, the present invention can be implemented in various modes without departing from the spirit of the invention. Industrial applicability

As described above, the policing apparatus and the policing method of the present invention are useful as an apparatus and a method for controlling the amount of fixed-length data sent to a network, and in particular, fixed-length data handling upper-layer frames. Suitable for controlling.

Claims

The scope of the claims

1. In a policing device that controls the amount of fixed-length data with unique identification information added to the network,

A frame recognizing unit for recognizing a frame of an upper layer to which the fixed length data belongs; a determining unit for determining a violation of fixed length data in the frame recognized by the frame recognizing unit;

A holding unit for holding a judgment result of the judgment unit for each piece of separate information;

A discard processing unit that discards the fixed-length data that is determined to be in violation by the determination unit and discards subsequent fixed-length data following the fixed-length data in the same frame as the fixed-length data. A policing device, characterized in that the policing device is configured in such a manner.

2. Unique identification information; ^ In a policing device that controls the amount of added fixed-length data sent to the network,

A frame recognition unit that recognizes a frame of an upper layer to which the fixed-length data belongs; a determination unit that determines a violation of fixed-length data in the frame recognized by the frame recognition unit;

A holding unit for holding a judgment result of the judgment unit for each 別 ^ different information;

A mark indicating the violation is added to the violation fixed-length data determined to be in violation by the determination unit, and the subsequent fixed length data following the violation fixed-length data in the same frame as the violation fixed-length data is added. A polishing apparatus, comprising: a discard processing unit for adding a mark to a long time.

3. The discard processing unit is configured to include a loss allowance information adding unit that adds loss allowance information indicating that the violation fixed-length data is allowed to be lost in the network. 3. The polishing apparatus according to claim 2, wherein:

4. The discard processing unit sends a violation information to the extended data added to the violation fixed-length data. 3. The polishing apparatus according to claim 2, further comprising a violation information adding unit for adding a report.

5. A setting information holding unit for holding information indicating a process to be performed on the violation fixed length data,

The discard processing unit is configured to perform a process to be performed on the violation fixed length data and the subsequent fixed length data based on the information held in the setting information holding unit. The polishing apparatus according to claim 1 or claim 2, characterized in that:

6. The discard processing unit is configured to include a replacement unit that replaces the first fixed violation length data in the frame determined by the determination unit with pseudo final fixed length data in the frame and transmits the data. The policing device according to claim 1, wherein

7. The discard processing unit is configured to pass the final fixed-length data when the determination unit determines that the final fixed-length data in the frame is violated. The polishing apparatus according to claim 1 or claim 2.

8. Sampling the information on the fixed length data of the frame held in the holding unit based on at least the final fixed length data in the frame or the leading fixed length data of the next frame. 3. The polishing apparatus according to claim 1, wherein the polishing apparatus includes a polishing apparatus.

9. A head information holding unit for holding information of a head fixed length data positioned at the head in the frame determined to be the violation fixed length data by the determination unit,

The same as the processing performed by the discard processing unit on all fixed length data in the frame to which the head fixed length data whose information is stored in the head holding unit belongs, to the head fixed length data. Claim 1 or the contract, characterized in that 3. The polishing apparatus according to claim 2, wherein

10. For each of the identification information, a type holding unit for holding fixed length data type information indicating that the upper layer of the fixed length data has a frame structure,

The discard processing unit fixes the violation fixed length data to the subsequent fixed length data following the violation fixed length data after the fixed length data type information is held in the type holding unit by the determination unit. The polishing apparatus according to claim 1 or 2, wherein the polishing apparatus is configured to perform the same processing as that performed on a long day.

11. The claim 1 or claim 2, characterized in that the holding section is provided with a counter for counting the number of times the recording power is held for each identification information. The polishing apparatus according to any one of the preceding claims.

1 2. A policing method that controls the amount of fixed-length data sent to the network.

Recognize the upper layer frame to which the fixed-length data belongs, determine the violation of the fixed-length data in the frame, and fix the violation for all subsequent fixed-length data following the fixed-length data in the frame. A policing method characterized by performing the same processing as that performed overnight.