JPH0730546A - Monitor equipment in atm transmitter - Google Patents

Abstract

PURPOSE:To detect a fault of communication due to cell abort or cell mis- arrangement without increasing an information quantity of cell by providing a monitor number check device checking whether or not a monitor number is a predetermined series and discriminating it to be fault when the monitor number is not the prescribed series. CONSTITUTION:A monitor number provision device 2 gives sequentially a monitor number of a prescribed number to a header part of an ATM cell received sequentially by a signal processing unit 1 according to the input sequence of each ATM cell. The monitor number check device 3 refers a monitor number given by the monitor number provision device 2 to a header part of the ATM cell outputted sequentially from the signal processing unit 1 to check whether or not the monitor number is the predetermined series. When the monitor number is not the predetermined series, it is discriminated to be fault. That is, a monitor number provision counter 2a of the device 2 is counted up every time an ATM cell is inputted to the processing unit 1 and the count of the counter 2a is written to the header part.

Description

Detailed Description of the Invention

(Table of Contents) Industrial Application Field of the Invention Conventional Techniques Problems to be Solved by the Invention Means for Solving the Problems (FIG. 1) Action (FIG. 1) Embodiment Example 1 Description of the First Embodiment (FIG. 2) (FIGS. 5 and 13) -Explanation of the second embodiment (FIGS. 6 to 8) -Explanation of the third embodiment (FIGS. 9 to 11) -Explanation of another embodiment (FIG. 12)

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow (path) of ATM cells in an ATM transmission device for transmitting ATM cells.
For monitoring equipment.

[0003]

2. Description of the Related Art Conventionally, in an ATM transmission device,
For example, the cells transmitted in the device are MUX (multiplex)
In a block such as a switch section, a SW (switch) section, and a DMUX (separation) section, a monitoring device in an ATM transmission device for monitoring whether or not a path forms a predetermined route is provided.

In the conventional monitoring device in the ATM transmission device, for example, a monitoring cell is made to flow at a constant cycle for monitoring, and this makes it possible to check whether the monitoring cell normally passes through the path. Can be monitored.

[0005]

However, in such a conventional monitoring device in the ATM transmission device, since the monitoring cell is made to flow through the path in which the user cell is flowing, the transmission inside the device is performed. The amount of information in the cells to be stored increases, causing cell discarding and cell misdelivery,
May cause communication problems.

Further, when the cell discard as described above occurs, it is not possible to detect whether or not the user cell is discarded by only monitoring the monitoring cell.
Therefore, there is a problem that it is not possible to detect a communication abnormality. Further, if a device such as an LSI of the main signal system fails, an alarm may not be detected even if cell discard occurs. Even in such a case, at present, it is impossible to specify in which package the cell discard is occurring.

The present invention was devised in view of the above problems, and it is possible to detect a communication abnormality due to cell discard, cell misdelivery, etc. without increasing the amount of cell information in an ATM transmission apparatus. It is an object of the present invention to provide a monitoring device according to the above.

[0008]

FIG. 1 is a block diagram of the principle of the present invention. In FIG. 1, 1 is a signal processing means, and this signal processing means 1 is an ATM cell having routing information in a header part. Is transmitted based on the routing information. Further, 2 is a monitoring number assigning means, and this monitoring number assigning means 2 sequentially assigns a predetermined number of monitoring numbers to the header part of the ATM cells sequentially input to the signal processing means 1 according to the input order of each ATM cell. To do.

For this reason, the monitoring number assigning means 2 determines the monitoring number assigning counter 2a, which is incremented each time an ATM cell is input to the signal processing means 1, and the count value of the monitoring number assigning counter 2a. Writing means 2b for writing in the header portion of the ATM cell as a monitoring number in a sequence
It is configured with. Further, 3 is a monitoring number checking means, and this monitoring number checking means 3 refers to the monitoring number assigned by the monitoring number assigning means 2 to the header portion of the ATM cell sequentially output from the signal processing means 1. It is checked whether or not the monitoring numbers are in a predetermined sequence, and if the monitoring numbers are not in the predetermined sequence, it is determined that there is an abnormality.

Therefore, this monitoring number check means 3
Is a monitoring number check counter 3a which is incremented each time an ATM cell is output from the signal processing means 1.
And a comparing means 3b for comparing the count value of the monitor number check counter 3a with the monitor number given to the header of the ATM cell (claims 1 and 2).

The signal processing means 1 has a plurality of input ports and a plurality of output ports, and an ATM cell input from each input port is output to an appropriate output port according to the routing information in the header of the ATM cell. It is possible to use an ATM switch that outputs to. In this case, the monitoring number assigning means 2 is provided for each input port, the monitoring number checking means 3 is provided for each output port, and the monitoring number assigning means 2 responds to the routing information of the header part of the ATM cell. A monitoring number is assigned to each output port, and the monitoring number check means 3
Based on the input port information to the ATM switch about the ATM cell written in the header of the M cell,
The monitoring number is checked for each input port (claim 3).

The signal processing means 1 has one input port and a plurality of output ports, and an ATM cell input from the input port is output to an appropriate output port according to the routing information in the header of the ATM cell. It is also possible to use a separating device for separating and outputting. In this case, the monitoring number assigning means 2 is provided on the input port side, the monitoring number checking means 3 is provided for each output port, and the monitoring number assigning means 2 responds to the routing information in the header part of the ATM cell. A monitoring number is assigned to each output port (claim 4).

Further, as the signal processing means 1, it is also possible to use a multiplexer having a plurality of input ports and one output port, which multiplexes ATM cells input from each input port and outputs the multiplexed ATM cells from the output port. It is possible. In this case, the monitoring number assigning means 2 is provided for each input port, the monitoring number checking means 3 is provided on the output port side, and the monitoring number checking means 3 is used for the ATM.
The monitoring number is checked for each input port based on the input port information to the ATM switch for the ATM cell written in the header portion of the cell (claim 5).

In the monitoring device in the ATM transmission apparatus of the present invention, the cell generating means for generating the monitoring cell and the monitoring cell from the cell generating means are signaled as an ATM cell when the ATM cell is not input. It may be provided with a switching means for switching and inputting to the processing means 1 (claim 6).

[0015]

In the above-described present invention, the monitoring number assigning means 2 sequentially assigns a predetermined number of monitoring numbers to the header portion of the ATM cells sequentially input to the signal processing means 1 according to the input order of each ATM cell. The ATM cell input to the signal processing means 1 is transmitted to the monitoring number checking means 3 based on the routing information in the header part.

The monitoring number checking means 3 refers to the monitoring number assigned by the monitoring number assigning means 2 to the header portion of the ATM cells sequentially output from the signal processing means 1,
Check whether the monitoring number is in a predetermined sequence,
When the monitoring numbers are not in the predetermined sequence, it is determined that there is an abnormality (Claim 1). That is, in the monitoring number giving means 2, in the monitoring number giving counter 2a, the signal processing means 1
Each time an ATM cell is input to the counter, the writing means 2b writes the count value of the monitoring number assigning counter 2a in the header portion of the ATM cell as a predetermined number of monitoring numbers.

Further, in the monitor number checking means 3, the monitor number checking counter 3a counts up each time an ATM cell is output from the signal processing means 1, and in the comparing means 3b, the monitor number checking counter 3a. The count value and the monitoring number given to the header of the ATM cell are compared. As a result, when the monitoring numbers are not in the predetermined sequence, it is determined that there is an abnormality (claim 2).

When an ATM switch having a plurality of input ports and a plurality of output ports is used as the signal processing means 1, the monitoring number giving means 2 outputs an output according to the routing information of the header part of the ATM cell. A monitoring number is assigned to each port. Next, the ATM switch outputs the ATM cell input from each input port to an appropriate output port according to the routing information in the header of the ATM cell. Then, the monitoring number checking means 3 causes the AT
Based on the input port information to the ATM switch about the ATM cell written in the header of the M cell,
The monitoring number is checked for each input port (claim 3).

Further, when a separating device having one input port and a plurality of output ports is used as the signal processing means 1, the monitoring number giving means 2 outputs according to the routing information of the header part of the ATM cell. A monitoring number is assigned to each port. Next, the separating device separates and outputs the ATM cell input from the input port to an appropriate output port according to the routing information in the header of the ATM cell. Then, the monitoring number checking means 3 checks the monitoring number assigned as described above (claim 4).

Further, when a multiplexer having a plurality of input ports and one output port is used as the signal processing means 1, the monitoring number giving means 2 gives a monitoring number to the header portion of the ATM cell. The ATM cells input from the respective input ports are multiplexed by the multiplexer and output from the output port. Then, the monitoring number checking means checks the monitoring number for each input port based on the input port information to the ATM switch regarding the ATM cell written in the header portion of the ATM cell (claim 5).

When no ATM cell is input, the monitoring cell generated by the cell generation means can be switched to the signal processing means as an ATM cell by the switching means to monitor the flow of cells. (Claim 6).

[0022]

Embodiments of the present invention will be described below with reference to the drawings. (A) Description of First Embodiment FIG. 2 is a block diagram showing a monitoring device in an ATM transmission device according to a first embodiment of the present invention. In FIG. 2, 11A is an ATM switch as a signal processing means. The ATM switch 11A has, for example, four input ports (#a to #d) and four output ports (#A to #).
D), and outputs an ATM cell input from each input port to an appropriate output port according to the routing information in the header of the ATM cell.

Further, reference numerals 12A to 12D are sequence number assigning units as monitoring number assigning means, and these sequence number assigning units 12A to 12D are provided to the input ports #a to #d of the ATM switch 11A, respectively. A
A sequence number (a continuous natural number sequence of 1, 2, 3, ...) Is given as a monitoring number for each output port according to the routing information of the header portion of the ATM cell sequentially input to the TM switch 11A. Therefore, the configuration is as shown in FIG.

That is, in FIG. 3, reference numeral 12c is a header data latch unit, and this header data latch unit 12
The c is for temporarily storing (latching) the header portion of the ATM cell input to the ATM switch 11A. Also,
Reference numeral 12d is a routing tag decoding unit, and this routing tag decoding unit 12d of the ATM switch 11A that should output an ATM cell from the routing tag (routing information) of the data latched by the header data latch unit 12c. It is for decoding the output port information.

Further, 12f is a logical product circuit, and the logical product circuit 12f outputs a logical product of a cell head pulse as a timing at which the head of the ATM cell is input and a cell enable signal as valid cell information. To do. Here, as shown in FIG. 13, the cell enable signal rises when the input ATM cell includes valid data to be transmitted, and the logical product of the cell enable signal and the cell head pulse is ANDed. Circuit 12
By obtaining it at f, the cell head pulse of the effective cell can be identified.

The logical product circuit section 12g is composed of, for example, four logical product circuits 12gA to 12gD, and output port information from the routing tag decoding section 12d and valid cell cells from the logical product circuit 12f, respectively. The top pulse information is input and the logical product of these is output. That is, the logical product circuits 12gA to 12g
The output of gD rises when a valid cell whose output destination is output ports #A to #D is input.

Further, 12a is a sequence number giving counter unit, and the sequence number giving counter unit 12a has four counters 12a corresponding to the output ports.
A to 12aD, and these counters 12a
A to 12aD are logical product circuits 12gA to 12g, respectively.
When the logical product information from gD is received and the logical product information rises, the count value is counted up, and the count value, that is, the sequence number of the natural number sequence is output as the monitoring number.

Reference numeral 12e is a delay section, which delays the ATM cell input to the ATM switch 11A for a predetermined time, and the header cell is latched by the header data latch section 12c. Can be input to the MUX unit 12b simultaneously with the output from the sequence number giving counter unit 12a.

The MUX unit (writing means) 12b includes a delay unit 1
An ATM cell including a data section delayed by 2e, a header section latched by a header data latch section 12c,
The count value as the sequence number from the sequence number giving counter section 12a is inputted, and these pieces of information are multiplexed and outputted. This MUX section 12b
As a result, the count value as the sequence number is overwritten in the header portion of the ATM cell.

Now, in FIG. 2, 13A to 13D are sequence number checking units as monitoring number checking means, and these sequence number checking units 13A to 1D are provided.
The 3Ds are respectively provided to the output ports #A to #D of the ATM switch 11A, and refer to the sequence numbers assigned by the sequence number assigning units 12A to 12D to the headers of the ATM cells sequentially output from the ATM switch 11A. Then, it is checked whether or not the sequence number is in a predetermined number sequence (natural number sequence), and if the sequence number is not in the predetermined number sequence, it is determined to be abnormal.
It is configured as shown in.

In FIG. 4, 13c is a header data latch unit, and this header data latch unit 13c is
The header of the ATM cell received from the ATM switch 11A is latched. 13e is an AND circuit, and this AND circuit 13e is used in the ATM switch 11
It outputs a logical product of a cell head pulse as a timing at which the head of the ATM cell received from A is input and a cell enable signal as valid cell information. Like the AND circuit 12f described above, the cell of the valid cell is output. It is for identifying the head pulse.

Further, the routing tag decoding unit 13d
Is input port information (the ATM cell is the ATM switch 1) from the data latched in the header data latch unit 13c.
It is written in the header when passing 1A.
The information indicating from which input port the TM cell is input) is decoded. AND circuit section 13f
Is composed of, for example, four logical product circuits 13fa to 13fd, and the input port information from the routing tag decoding unit 13d and the cell head pulse information of the effective cell from the logical product circuit 13e are input to these, respectively. It outputs a logical product. That is, the AND circuit 1
The outputs of 3fa to 13fd are input port #a, respectively.
It is adapted to rise when a valid cell whose input source is ~ # d is input.

Further, 13a is a sequence number checking counter unit, and this sequence number checking counter unit 13a has four counters 13aa to 13ad corresponding to the input ports, and these four counters 13aa to 13ad. Respectively receives the logical product information from the logical product circuits 13fa to 13fd, and counts up the count value when the logical product information rises.

In this embodiment, four sequence number assigning sections 12A to 12 are provided for each input port of the ATM switch 11A.
D is provided, and sequence number check units 13A to 13D are provided for each output port of the ATM switch 11A.
Therefore, there are 16 counters 12aA to 12aD on the input port side and 16 counters on the output port side.
Although there are individual counters 13aa to 13ad,
The counters 12aA to 12aD on the input port side and the counters 13aa to 13ad on the output port side perform the counting operation in synchronization unless the ATM cells are discarded or mis-distributed.

That is, the four counters 12aA to 12aD in the sequence number assigning unit 12A are the same as the counters 13 in the sequence number checking units 13A to 13D.
4 in the sequence number assigning unit 12B in synchronization with aa
The one counter 12aA to 12aD is synchronized with the counter 13ab in each sequence number check unit 13A to 13D, and the four counters 12aA to 12aD in the sequence number assigning unit 12C are synchronized with the counter 13ac in each sequence number check unit 13A to 13D. The four counters 12aA to 12aD in the sequence number assigning unit 12D are adapted to synchronize with the counter 13ad in each of the sequence number checking units 13A to 13D.

Further, 13h is a selector, and this selector 13h, based on the input port information from the routing tag decoding unit 13d, corresponds to the counter 13a.
The count value information from a to 13ad is selected and output to the comparator (comparing means) 13b. The comparator 13b compares the sequence number in the header section latched by the header data latch section 13c with one output selected by the selector 13h among the four counters 13aa to 13ad, and outputs an alarm signal if they do not match. To do.

Further, 13j is a logical product circuit unit, and the logical product circuit unit 13j is configured to have four logical product circuits 13ja to 13jd corresponding to the input ports, and these logical product circuits 13ja to 13jd are formed. , Which outputs the logical product of the input port information from the routing tag decoding unit 13d and the alarm signal from the comparator 13b obtained via the mask circuit 13i described later. #A
It is possible to output whether an abnormality occurs in the ATM cells from #d to #d.

Reference numeral 13g is a comparison start determination unit, and this comparison start determination unit 13g is a header data latch unit 13
The sequence number information from c and the input port information from the routing tag decoding unit 13d are input, and, for example, the sequence number of the ATM cell from each input port is masked until "all0" as an initial value is input. The circuit 13i controls not to generate the alarm signal from the comparator 13b, and the counter 1
3aa to 13ad are controlled to be in a disabled state.

The operation of the monitoring device in the ATM transmission device according to the first embodiment of the present invention having the above-described configuration will be described with reference to FIG.
-By using FIG. 5, it demonstrates below. That is, the ATM cell transmitted via the ATM switch 11A in FIG. 2 is input to any of the four sequence number assigning units 12A to 12D before being input to the ATM switch 11A. The ATM cell input to the sequence number assigning unit is latched at the header portion of the cell in the header data latch unit 12c in FIG.

If the cell is a valid cell, the routing tag decoding unit 12d decodes the output port information from the routing tag in the latched data, and the sequence number assigning counter unit 12a prepares for each output port. The corresponding one of the counters 12aA to 12aD is counted up. And M
In the UX unit 12b, the counted-up count value (sequence number) is overwritten on the header portion of the ATM cell as a monitoring number and output to the ATM switch 11A.

The ATM cell output in this way has a header portion, as shown in FIG.
A sequence number is added to the routing information.
For example, in the sequence number assigning unit 12A connected to the input port “#a” of the ATM switch, ATM cells having routing information (output port information) of A, A, C, B, ... However, by adding a sequence number to the header part of this ATM cell, A1, A2, C
The data is output to the ATM switch 11A in a format such as 1, B1, ...

The ATM cell input to the ATM switch 11A is output from the output port based on the routing information in the header of the ATM cell. For example, A1, from the sequence number assigning unit 12A described above,
A having routing information of A2, C1, B1, ...
The TM cells are output to the output ports "#A", "#A", "#C", "#B", ... Of the ATM switch 11A, respectively.

From this ATM switch 11A to AT
When the M cell is output to the output port, the output port information owned at the time of input is rewritten to the input port information. The ATM cells output from the output ports #A to #D of the ATM switch 11A are input to the sequence number check units 13A to 13D, respectively, and the header data latch unit 13c in FIG. It If the cell is a valid cell, of the latched data, the routing tag decoding unit 13d decodes the input port information from the routing tag, and the sequence number checking counter unit 13a prepares it for each input port information. The corresponding counter among the counters 13aa to 13ad is counted up.

The comparator 13b compares the counted-up count value with the sequence number stored in the header portion of the received ATM cell, and outputs an alarm signal from the comparator 13b if they do not match. . In addition, any of the input ports #a to #d
Whether or not the alarm signal is output for the ATM cell from the logical product circuit 13ja-
It can be recognized by which output of 13jd rises.

As described above, the monitoring device in the ATM transmission device according to the first embodiment of the present invention includes the sequence number assigning units 12A to 12D, the sequence number checking units 13A to 13D, and the ATM switch 11A. Therefore, in the ATM switch 11A, there is an advantage that a communication abnormality due to cell discard, cell misdelivery, etc. can be detected without increasing the amount of cell information.

In the first embodiment described above, the case where the device of the present invention is applied to the ATM switch 11A having four input ports and four output ports has been described. It is not limited to. (B) Description of Second Embodiment FIG. 6 is a block diagram showing a monitoring device in an ATM transmission device according to a second embodiment of the present invention. In FIG. 6, 11B is a separating device as a signal processing means, and this separating device 11B has one input port and four output ports (#A to #D) and is inputted from the input port. The ATM cell is separated and output to an appropriate output port according to the routing information in the header of the ATM cell.

Further, 12A is a sequence number assigning section, and this sequence number assigning section 12A is the same as that in the first embodiment. Therefore, this sequence number assigning section 12A also has the function shown in FIG. Since the configuration is as shown in the block diagram, the description is omitted. Further, 14A to 14D are sequence number checking units as a monitoring number checking unit, and the sequence number checking units 14A to 14D are assigned by the sequence number assigning unit 12A to the header portion of the ATM cells sequentially output from the separating device 11B. Referenced sequence number,
It is determined whether or not the sequence number is a predetermined number sequence (natural number sequence), and if the sequence number is not the predetermined number sequence, it is determined to be abnormal.
Is shown as a block diagram of.

In FIG. 7, 14c is a header data latch unit, and this header data latch unit 14c is
The header of the ATM cell received from the separating device 11B is latched. 14d is a logical product circuit, and this logical product circuit 13e outputs a logical product of a cell head pulse as a timing at which the head of the ATM cell received from the separating device 11B is input and a cell enable signal as valid cell information. This AND circuit 13
The output from e rises when a valid cell is input.

Further, 14a is a sequence number checking counter, and this sequence number checking counter 14a receives the logical product information from the logical product circuit section 14d, and when this logical product information rises, the count value is changed. It is supposed to count up. Reference numeral 14b is a comparator (comparing means).
In b, the sequence number in the header section latched in the header data latch section 14c is compared with the output from the sequence number check counter 14a, and if they do not match, an alarm signal is output.

The operation of the monitoring device in the ATM transmission apparatus according to the second embodiment of the present invention having the above-mentioned structure will be described below with reference to FIGS. 3, 6, 7 and 8. That is, the ATM cell transmitted via the separating device 11B in FIG. 6 is input to the sequence number assigning unit 12A before being input to the separating device 11B. The ATM cell input to the sequence number assigning unit 12A is as shown in FIG.
The header portion of the cell is latched in the header data latching portion 12c in FIG.

If the cell is a valid cell, the routing tag decoding unit 12d decodes the output port information from the routing tag in the latched data, and the sequence number assigning counter unit 12a prepares for each output port. The corresponding one of the counters 12aA to 12aD is counted up. And M
In the UX unit 12b, the counted-up count value (sequence number) is overwritten on the header portion of the ATM cell as the monitoring number and output to the separation device 11B.

When the header portion of the output ATM cell is focused on, for example, as shown in FIG.
A sequence number is added to the routing information.
In the sequence number assigning unit 12A shown in FIG. 8, an ATM cell having routing information D, D, C, C, ... Is input in chronological order. A sequence number is assigned to the header part of this ATM cell. By doing so, D1, D2, C1, C2, ...
Is output to the separating device 11B in a format such as.

The ATM input to the separating device 11B
The cell is adapted to be output from the output port based on the routing information in the header part. For example, D1, D2, and
The ATM cells having the routing information of C1, C2, ...
D ","#D","#C","#D", ...

Then, the output port #A of the separating device 11B
~ # D ~ The output ATM cells are input to the sequence number check units 14A to 14D, respectively, and the header data latch unit 14c in Fig. 7 latches the header portions of the cells. If the cell is a valid cell, the AND circuit 14d causes the sequence number check counter 14
Count up the value of a. In addition, the comparator 1
In 4b, the sequence number in the data latched by the header data latch section 14c is compared with the value from the sequence number check counter 14a, and if they do not match, an alarm signal is output from this comparator 14b.

As described above, according to the monitoring device in the ATM transmission apparatus according to the second embodiment of the present invention, the sequence number assigning unit 12A and the sequence number checking units 14A to 14A.
Since 14D and the separating device 11B are provided, there is an advantage that an abnormality in communication due to cell discarding, erroneous cell distribution, etc. can be detected in the separating device 11B without increasing the amount of cell information.

In the second embodiment described above, the case where the device of the present invention is applied to the separation device 11B having one input port and four output ports has been described. It is not limited to. (C) Description of Third Embodiment FIG. 9 is a block diagram showing a monitoring device in an ATM transmission device according to a third embodiment of the present invention. In FIG. 9, 11C is a multiplexing (MUX) as a signal processing means.
This multiplexer 11C has four input ports (#a to #d) and one output port, and multiplexes ATM cells input from each input port and outputs the multiplexed ATM cells from the output port. Is.

Further, 15A to 15D are sequence number giving units, and the sequence number giving units 15A to 15D.
Are provided for each input port, and the multiplexer 1
A sequence number (monitoring number) according to the routing information (output port information) of the header portion of the ATM cells sequentially input to 1C is added, and is functionally shown as in the block diagram of FIG. Be done.

In FIG. 10, reference numeral 15c is a logical product circuit. The logical product circuit 15c has a cell head pulse as a timing at which the head of an ATM cell output to the multiplexer 11C is input, and valid cell information. It outputs a logical product with the cell enable signal, and when a valid cell is input, it outputs an H (high) level signal to the sequence number assigning counter 15a and the cell control signal generation unit 15d. ing.

The sequence number giving counter 15a
When the H level signal from the AND circuit 15c is received, the count value is incremented. Also,
The cell control signal generation unit 15d includes the AND circuit unit 15 described above.
When the H level signal from c is input, a predetermined control signal is output to the MUX unit 15b.

When the MUX section (writing means) 15b receives the control signal from the cell control signal generating section 15d, the count value (sequence number) from the sequence number assigning counter 15a is transferred to the delay section (delay) 15e. The header portion of the ATM cell input via the above is overwritten. The delay unit 15e converts the ATM cell input to the MUX unit 15b into a sequence number assigning counter 15a.
It is delayed by the period of the counting operation by.

By the way, 13A in FIG. 9 is a sequence number check unit, but this sequence number check unit 13A is the same as that in the first embodiment, and therefore, this sequence number check unit 13A is also shown in FIG. Since it is configured as in the functional block diagram shown in FIG. The operation of the monitoring device in the ATM transmission device according to the third embodiment of the present invention having the above-described configuration will be described with reference to FIGS.
This will be described below.

That is, the multiplexing device 11C in FIG.
Before being input to the multiplexer 11C, the ATM cell transmitted via the is input to any of the sequence number assigning units 15A to 15D according to the input port. The ATM cells input to the sequence number assigning units 15A to 15D are delayed by a predetermined time by passing through the delay unit 15e in FIG. 10 and input to the MUX unit 15b.

When the H level signal (valid cell information) is output from the AND circuit 15c, the monitoring number assigning counter 15a is incremented, and the control signal from the cell control signal generator 15d is received. , MUX
In the unit 15b, the counted-up value (sequence number) is overwritten on the header portion of the ATM cell as the monitoring number.

When the signal output from the AND circuit 15c is at the L (Low) level, the monitoring number assigning counter 15a does not count up, and the MUX unit 15b also outputs this count value to the cell header. Do not overwrite the department. Therefore, no sequence number is given. Then, the ATM cell in which the count value is overwritten in the header portion of the cell in the MUX unit 15b is output to the multiplexing device 11C. Further, when paying attention to the header portion of this ATM cell, a sequence number is added to the routing information as shown in FIG. 11, for example.

For example, paying attention to the sequence number assigning section 15A, sequence numbers of 1 and 2 are assigned in time series order. The respective sequence number assigning units 15A to 15D are output to the multiplexing device 11C in a format in which the sequence number is overwritten on such a header portion. When the ATM cells in which the sequence numbers are overwritten in the sequence number assigning units 15A to 15D are input to the multiplexer 11C, the multiplexer 11C
These ATM cells are multiplexed and output from one output port to the sequence number check unit 13A. At this time, the ATM cell is provided with input port information regarding from which input port the ATM cell was input.

In the multiplexer 11C, focusing on the header of the multiplexed signal, the input port information "A", "B", "C", "D" is given a sequence number. As shown in FIG. 11, “A
1 ”,“ B1 ”,“ C1 ”,“ D1 ”,“ A2 ”,“ B
Information such as "2", "C2", and "D2" is added to the header of each ATM cell.

Then, the sequence number check unit 13A
As for the ATM cell input to, the header portion of the cell is latched by the header data latch portion 13c in FIG. 4, as in the case of the first embodiment described above. If the cell is a valid cell, of the latched data, the routing tag decoding unit 13d decodes the input port information from the routing tag, and the sequence number checking counter unit 13a prepares it for each input port information. The corresponding counter among the counters 13aa to 13ad is counted up.

Then, the comparator 13b compares the counted-up count value with the sequence number stored in the header of the received ATM cell, and outputs an alarm signal from the comparator 13b if they do not match. . In addition, any of the input ports #a to #d
Whether the alarm signal has been output for the ATM cells from the logical AND circuits 13ja to 13j of the logical product circuit 13j.
It can be recognized by which output of 3jd rises.

As described above, the monitoring device in the ATM transmission device according to the third embodiment of the present invention includes the sequence number assigning units 15A to 15D, the sequence number checking unit 13A, and the multiplexing device 11C. In the multiplexer 11C, there is an advantage that a communication abnormality due to cell discard, cell misdelivery, etc. can be detected without increasing the amount of cell information.

In the third embodiment described above, the case where the apparatus of the present invention is applied to the multiplexer 11C having four input ports and one output port has been described. It is not limited to this. (D) Description of Other Embodiments In the above-described embodiments, ATM as signal processing means is used.
The switch 11A, the demultiplexer 11B, and the multiplexer 11C perform monitoring when valid cells are flowing. In the devices as the signal processing means, when no valid cells are flowing, the sequence is performed. By generating a numbered monitoring cell,
You may check the unused paths.

In this case, as shown in FIG. 12, in front of the sequence number assigning units 12A to 12D, a monitoring cell generating unit 16 which receives a control signal from a control block (not shown) and generates a monitoring cell, A FIFO memory 17 for storing valid cells, a FIFO memory 18 for storing monitoring cells, and a selector 19 for selecting one of an ATM cell and a monitoring cell from a user.
And a capacity monitoring unit 20 for selecting one of the cells stored in the FIFO memory 17 and the FIFO memory 18 and inputting it to the sequence number assigning units 12A to 12D.

With this configuration, the monitoring cell generator 16 is set by a control block (not shown).
A routing tag is added to periodically generate monitoring cells. In the capacity monitoring unit 20, the FIFO memory 17 and the FI
If the FIFO memory 17 is empty and the FIFO memory 18 stores the monitoring cell while monitoring the number of ATM cells stored in the FO memory 18, the selector 19
To the FIFO memory 1 by outputting a control signal to
Sequence number assigning unit 1 by selecting a monitoring cell from 8
2A to 12D.

Therefore, since the monitoring cell can be generated when no valid cell is flowing, it is possible to monitor whether or not the path before setting is normal without affecting the flow of the user cell. It has become. Furthermore, in each of the above-described embodiments, the sequence number assigning unit 1
The sequence numbers given in 2A to 12D are given so as to be a natural number sequence, but the present invention is not limited to this.

[0074]

As described in detail above, the first aspect of the present invention
According to the monitoring device in the ATM transmission device as described above, the monitoring device in the ATM transmission device is provided with a signal processing means for transmitting an ATM cell having routing information in a header portion based on the routing information. In the header portion of the ATM cells sequentially input to the signal processing means,
A monitoring number assigning means for sequentially assigning a predetermined number of monitoring numbers in accordance with the input order of each ATM cell is provided, and the monitoring number assigning means assigns to the header portion of the ATM cells sequentially output from the signal processing means. A monitoring number check means for checking whether or not the monitoring number is in the predetermined number sequence by referring to the monitoring number and determining an abnormality when the monitoring number is not in the predetermined number sequence is provided. Therefore, there is an advantage that it is possible to detect a communication abnormality due to cell discarding, cell misdistribution, etc. without increasing the amount of cell information.

According to the second aspect of the present invention, the monitoring number assigning means counts up each time an ATM cell is input to the signal processing means, and the monitoring number assigning counter. And a writing means for writing the count value of the giving counter as a monitoring number of the predetermined sequence in the header portion of the ATM cell, and the monitoring number checking means transfers the ATM cells from the signal processing means. It has a monitor number check counter that is incremented each time it is output, and a comparison means for comparing the count value of the monitor number check counter with the monitor number given to the header of the ATM cell. Since it has been
There is an advantage that it is possible to detect communication anomalies due to cell discarding, erroneous cell distribution, etc. without increasing the amount of cell information.

Further, in the present invention according to claim 3, the signal processing means has a plurality of input ports and a plurality of output ports, and an ATM cell input from each input port is transferred to a header portion of the ATM cell. Is an ATM switch for outputting to an appropriate output port according to the routing information, and the monitoring number assigning means is provided for each input port, and the monitoring number checking means is provided for each output port, and the monitoring number assigning means is provided. Assigns the monitoring number to each output port according to the routing information of the header part of the ATM cell, and the monitoring number check means causes the ATM switch for the ATM cell written in the header part of the ATM cell. Since the monitoring number is checked for each input port based on the input port information to the cell, the cell information is checked in the ATM switch. Without increasing the amount, an advantage of detecting the abnormality of communication by cell loss, cell miscarriage like.

Further, according to the present invention of claim 4, the signal processing means has one input port and a plurality of output ports, and an ATM cell input from the input port is transferred to the ATM cell of the ATM cell. A separation device for separating and outputting to an appropriate output port according to the routing information of the header part, wherein the monitoring number assigning means is provided on the input port side, and the monitoring number checking means is provided for each output port. Since the monitoring number assigning means assigns the monitoring number to each output port according to the routing information of the header part of the ATM cell, the cell discard or the cell error is prevented in the separating device without increasing the cell information amount. There is an advantage that an abnormality in communication due to distribution or the like can be detected.

Further, according to the invention of claim 5,
The signal processing means has a plurality of input ports and one output port, and is a multiplexing device for multiplexing ATM cells input from the respective input ports and outputting the multiplexed ATM cells from the output ports.
The monitoring number assigning means is provided for each input port, the monitoring number checking means is provided on the output port side, and the monitoring number checking means is provided for the ATM cell written in the header portion of the ATM cell. Since the monitoring number is checked for each input port based on the input port information to the multiplexing device of
There is an advantage that it is possible to detect communication anomalies due to cell discarding, erroneous cell distribution, etc. without increasing the amount of cell information.

Further, according to the present invention as defined in claim 6, the cell generating means for generating the monitoring cell and the AT monitoring cell from the cell generating means when the ATM cell is not input.
Since switching means for switching and inputting to the signal processing means is provided as an M cell, there is an advantage that it is possible to monitor whether or not the path before setting is normal without affecting the flow of the user cell.

[Brief description of drawings]

FIG. 1 is a principle block diagram of the present invention.

FIG. 2 is a block diagram showing a first embodiment of the present invention.

FIG. 3 is a functional block diagram showing a sequence number assigning unit in the first embodiment of the present invention.

FIG. 4 is a functional block diagram showing a sequence number check unit in the first embodiment of the present invention.

FIG. 5 is a diagram for explaining the operation of the first embodiment of the present invention.

FIG. 6 is a block diagram showing a second embodiment of the present invention.

FIG. 7 is a functional block diagram showing a sequence number check unit in the second embodiment of the present invention.

FIG. 8 is a diagram for explaining the operation of the second embodiment of the present invention.

FIG. 9 is a block diagram showing a third embodiment of the present invention.

FIG. 10 is a functional block diagram showing a sequence number assigning unit in the third embodiment of the present invention.

FIG. 11 is a diagram for explaining the operation of the third embodiment of the present invention.

FIG. 12 is a block diagram showing another embodiment of the present invention.

FIG. 13 is a diagram illustrating identification of a leading pulse of a valid cell.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 signal processing means 2 monitoring number giving means 2a monitoring number giving counter 2b writing means 3 monitoring number checking means 3a monitoring number checking counter 3b comparing means 11A ATM switch 11B separating device 11C multiplexing device 12A to 12D, 15A to 15D Sequence number assigning unit 12a Sequence number assigning counter unit 12aA to 12aD, 13aa to 13ad counter 12b, 15b MUX unit 12c, 13c, 14c Header data latch unit 12d, 13d Routing tag decoding unit 12e, 15e Delay unit 12f, 12gA to 12gD , 13e, 13fa-13
fd OR circuit 12g, 13f, 13j OR circuit section 13A to 13D, 14A to 14D Sequence number check section 13a, 14a Sequence number check counter section 13b, 14b Comparator 13g Comparison start determination section 13h, 19 Selector 13i Mask circuit 13ja ˜13jd, 14d, 15c OR circuit 15a Sequence number assigning counter 15d Cell control signal generating unit 16 Monitoring cell generating unit 17, 18 Waiting cell storage unit 20 Capacity monitoring unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location H04Q 3/00 9076-5K (72) Inventor Ryuichi Kondo 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Within the corporation

Claims (6)

[Claims] 1. An AT having routing information in a header section
A monitoring device in an ATM transmission device comprising signal processing means (1) for transmitting M cells based on the routing information, the header of ATM cells being sequentially input to the signal processing means (1). The section is provided with monitoring number assigning means (2) for sequentially assigning a predetermined number of monitoring numbers in accordance with the input order of each ATM cell, and the header portion of the ATM cells sequentially output from the signal processing means (1). By referring to the monitoring number assigned by the monitoring number assigning means (2), it is checked whether or not the monitoring number is in the predetermined number sequence, and if the monitoring number is not in the predetermined number sequence, it is abnormal. AT having a monitoring number check means (3) for judging
Monitoring device in M transmission device. 2. A monitoring number assigning counter (2a) which is incremented each time an ATM cell is input to the signal processing means (1) by the monitoring number assigning means (2).
And a writing means (2b) for writing the count value of the monitoring number assigning counter (2a) into the header portion of the ATM cell as the monitoring number of the predetermined sequence, and the monitoring number check The means (3) counts up the monitor number (3) every time an ATM cell is output from the signal processing means (1).
a) and a comparing means (3b) for comparing the count value of the monitoring number check counter (3a) with the monitoring number given to the header of the ATM cell. The monitoring device in the ATM transmission device according to claim 1. 3. The signal processing means (1) has a plurality of input ports and a plurality of output ports, and an ATM cell input from each input port is appropriately selected according to routing information in a header portion of the ATM cell. AT output to output port
M switch, the monitoring number assigning means (2) is provided for each input port, the monitoring number checking means (3) is provided for each output port, and the monitoring number assigning means (2) is The monitoring number is assigned to each output port according to the routing information of the header part of the ATM cell, and the monitoring number check means (3) is used for the AT of the ATM cell written in the header part of the ATM cell.
The monitoring device in an ATM transmission device according to claim 1, wherein the monitoring number is checked for each input port based on input port information to the M switch. 4. The signal processing means (1) has one input port and a plurality of output ports, and an ATM cell input from the input port is appropriately selected according to routing information in a header portion of the ATM cell. A separation device for separating / outputting to / from an output port, wherein the monitoring number assigning means (2) is provided on the input port side, and the monitoring number checking means (3) is provided for each output port. The monitoring device in an ATM transmission device according to claim 1 or 2, wherein the assigning means (2) assigns the monitoring number to each output port according to the routing information of the header portion of the ATM cell. 5. A multiplexing device, wherein the signal processing means (1) has a plurality of input ports and one output port, and multiplexes ATM cells input from each input port and outputs the multiplexed ATM cells from the output port. Yes, the monitoring number assigning means (2) is provided for each input port, the monitoring number checking means (3) is provided on the output port side, and the monitoring number checking means (3) is 3. The ATM transmission according to claim 1, wherein the monitoring number is checked for each input port based on the input port information to the multiplexer for the ATM cell written in the header section. Monitoring equipment in equipment. 6. A cell generating means for generating a monitoring cell, and a switching means for switching and inputting a monitoring cell from the cell generating means as an ATM cell to the signal processing means when no ATM cell is input. The monitoring device in an ATM transmission device according to any one of claims 1 to 5, wherein the monitoring device is provided.