JP3496357B2 - Performance monitor calculation method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a performance monitor calculation method used, for example, in monitoring transmission quality.

In Synchronous Digital Hierarchy (SDH),
The transmission information for error monitoring is divided into, for example, every 8 bits, the divided transmission information is subjected to parity calculation, and the calculation result is inserted into the B1 byte of the overhead, and between the repeaters,
Alternatively, error monitoring is performed between the repeater and the transmission terminal device. As a result, the performance (transmission quality) of the above section can be known.

The operation result is recorded as an error history including the time of occurrence, and when the transmission quality exceeds a threshold value, it is reported as an alarm. In recent years, there has been a change in regulations for monitoring transmission quality, and it is required to monitor transmission quality with higher accuracy.

However, the conventional performance monitor calculation method has a low precision in the calculation result and is insufficient to satisfy the above requirements. Therefore, it is necessary to change the calculation method to improve the accuracy of calculation data.

[0005]

2. Description of the Related Art FIG.
FIG. 6 is an example of a main part configuration diagram for realizing FIG. 5, and FIG. 7 is an explanatory diagram of a conventional performance monitor calculation method (part 1)
Where (a) is an example of collected CV values corresponding to the passage of time, and (b) is C
V item calculation explanatory diagram, (c) ES item calculation explanatory diagram, (d) SES
Item calculation explanatory diagram, (e) UAS item calculation explanatory diagram, (f) SE
It is an FS item calculation explanatory drawing.

FIG. 8 is an explanatory view of a conventional performance monitor calculation method (No. 2), (a) is an example of collected CV values corresponding to the passage of time, (b) is a CV item calculation explanatory diagram, c)
Shows ES item calculation explanatory diagram, (d) SES item calculation explanatory diagram, (e)
UAS item calculation explanatory diagram, (f) is a SEFS item calculation explanatory diagram.

Hereinafter, FIGS. 5 to 8 will be described. First, the items necessary for monitoring the transmission quality and the calculation method of these items are determined as follows. That is, Coding Violatio
n: abbreviated as CV) The number of errors that occurred in 1 second. While an error is occurring, it is counted regardless of other calculation items.
(Unit: Pieces) ・ Errored Second (abbreviated as “Ereored Second: ES”) 1 second in which 1 or more CVs occur is counted as 1 ES. (Unit: seconds) ・ Severely Ereo Second
red Second: Abbreviated as SES) More than the specified CV value (the number of errors above a certain level)
1 second in which is generated is counted as 1 SES.
(Unit: seconds) ・ UnAvailable Second:
(It is abbreviated as UAS.) SES is counted for 10 seconds when it continues for 10 seconds, and counting is started until Non-SES continues for 10 seconds. (Unit: seconds) ・ Civilii errored framing seconds
(Severely Ereored Flaming Second: Abbreviated as SEFS) One second in which one or more synchronization deviations occur is counted as one SEFS.

(Calculation element is independent of CV)
(Unit: seconds) ・ Threshold crossing alert (Threshh
old Crossing Alert: Abbreviated as TCA report) This is a report notifying that the calculated data exceeds the fixed value (TCA value) determined for each calculated item.

When the performance monitor is calculated, which item is used for calculation follows the procedure shown in FIG. That is, when the calculation items are obviously decided, the decided calculation items are calculated (added) and the calculation data is held.
(See steps S1-Y, S2).

However, if the calculation items are not fixed, the calculation is performed (added) on all the target items to hold the uncertain calculation data (see steps S1-N and S3). Then, whether the calculated data exceeds a certain value,
For example, it is checked at intervals of 1 second, and if it exceeds the limit, the TCA report is transmitted, and if it does not exceed, the process returns to step S1 and repeats the calculation (step S4).

In order to perform the above calculation, a CPU 11 as shown in FIG. 6 and a program ROM storing the procedure shown in FIG.
12b, memory (normal buffer) 14 for storing the calculated data for all items in the corresponding areas, interface parts INF ₁ and IN for interfacing with the outside
F ₂ and RAM 13 used for calculation are provided.

As a result, the CPU has the interface portion IN
The calculation data is stored in the normal buffer 14 by repeating the calculation according to the procedure stored in the program ROM 12b for the number of errors input via F ₁ and INF ₂ , but when the calculation data exceeds a certain value, TCA Send the report.

Next, the performance monitor calculation (hereinafter, abbreviated as PM calculation) will be described in detail. The "number of errors above a certain level" in the above SES item
Is, for example, 5 or more, which is an area above the dotted line of (a) in FIGS. 7 and 8. One scale on the horizontal axis differs from 5 seconds in FIG. 7 and 1 second in FIG. There is. In addition, the above five items are the criteria for determining the calculation item by the threshold value.

In FIG. 7, the part (a)-is the collected CV.
Since the value (number of errors) is less than the threshold value, the CPU in Fig. 6 calculates CV items and ES items, which are confirmed calculation items, but the calculation data of CV items is predetermined by this calculation. TC when the value exceeds the value (for example, 100) (↓ in the figure)
While sending the A report, the operation (addition) is continued and the operation data is stored in the corresponding area in the normal buffer (see Figure 5-S1-Y, S2, S4).

In (a)-, since the collected CV values are 5 or more, calculation data (cumulative error number and cumulative time) is calculated by calculating CV item, ES item, and SES item, and the calculated data is calculated. Add to the operation data of the corresponding area in the corresponding normal buffer.

Note that the UAS item is not calculated because the duration above the threshold is 10 seconds or less (see S1-N, S3 and S4 in FIG. 5-). As in (a)-(b), since the CV value is above the threshold as in the above part, the CV item, ES item, and SES item are calculated, but for the UAS item, the SES item is calculated for 10 seconds. The calculation is started with the time at which it continued as 1 second.

The part (b) of (a)-is the CV item, ES
The items and SES items are calculated, but the reason why the SES item calculates the time even when the CV value is below the threshold value is as follows. In other words, in (a)-(b) part, the CV value became smaller than the threshold value for 5 seconds, but since it was within the specified 10 seconds, it was judged that the part (b) continued. is there.

Further, since the CV value in the part (c) becomes 0 for 5 seconds continuously, the CV value is 0 in the CV item, ES item and SES item.
However, the UCA item continues the computation until the SES item computation stops for 10 seconds, and when the computed data exceeds a predetermined value, the TCA
Send the report.

Here, the counting period of the UAS item is shown in FIG.
As shown in (e), it is shifted to the right by 10 seconds from the SES item. Further, the operation data obtained in the portions (a) to (c) of (a)-is added to the operation data of the corresponding area in the normal buffer.

(A)-(b) part is CV item, ES item, (b) part is CV item, ES item, SES item, (c)
The part of C is the CV item, the ES item, the part of (d) is the CV item, the ES item, the SES item, and the part of (e) is the CV item, the ES item, and the SES item. It is added to the operation data of the corresponding area in the buffer.

The reason why the SES item is not calculated in the part (c) is that the CV value in the part (b) has fallen below the threshold value within 10 seconds, and it is judged to be a disconnection. Also,
The reason why the SES item continued to operate for 10 seconds in (e) is C
It was checked whether or not the V value continued to decrease for 10 seconds, and it was confirmed that it continued, and the calculation was completed.

Furthermore, since the SES item continued for 10 seconds in the UAS item, the calculation was started with the time at this point as 1 second,
The calculation time is until the point (e) continues for 10 seconds,
The operation data is added to the corresponding area of the regular buffer. In this case, the computation stop time of the SES item and the UAS item matched.

Further, the SEFS item indicates that there are four 1-second (circle) portions in which the synchronization is lost one or more times. In FIG. 8, (a) in the figure shows the number of errors (CV value) collected in 1 second. For example, the number of errors is 0 from the start of collection to 2 seconds, 3 in the next 1 second,
Further, it indicates that there were 6 in the next 1 second.

The CV items in (b) in the figure are (a) to (a) to (a).
The operation data obtained by adding the number of errors per second in the portion (h) is shown. For example, the operation data obtained by adding 30 seconds is 129, and this value is stored in the corresponding area of the normal buffer.

Further, the ESE items, SES items of (c) to (e),
Of the UAS items, the ES item has 27 seconds of calculated data that adds 1 second when the number of errors is 1 or more, and the SES item has 16 seconds of calculated data that adds 1 second that has the number of errors of 5 or more. This value is stored in the corresponding area of the regular buffer.

In addition, the UAS item starts addition for 1 second with the time "12" when the SES item continues for 10 seconds as 1 second, and when the SES item stops addition "16" for 10 seconds continuously. The calculated data obtained by adding 1 second up to is 17 seconds, and this value is stored in the corresponding area of the normal buffer.

Here, the SEFS item shown in (f) indicates that there are 5 times of one second in which one or more out-of-sync occurrences occur. The calculation factor is independent of CV. In other words, with the conventional performance monitor calculation method, 1
Since only one normal buffer was used for one item, the calculations shown in FIGS. 7 and 8 were performed.

Therefore, for example, at point (g) in FIG. 7 (a),
Originally, the calculation of the UAS item should start, but it will be the time when the calculation of the SES item starts. This is the time when the calculation of the UAS item was started from a later point of view, but it was unknown when the calculation of the SES item was started, and the time when 10 seconds continued was the time when the calculation of the UAS item was started.

On the other hand, at the point (h) in FIG. 7 (a), the SES item has already been cleared to 0, but the point at which the SES item has been cleared to 0 for 10 consecutive seconds is the end point of the UAS item calculation. Therefore, a time lag of, for example, 10 seconds occurs.

Further, in order to continue the calculation of CV item, ES item, and SES item during the calculation of UAS item, ES item and SES item
The calculation data of UAS items do not match. Also, the TCA report shown by ↓ in the UAS item also has a time lag, and the results do not match as with the calculated data.

[0031]

As described above, there is a time lag between the actual calculation start time and the actual calculation end time, and the performance monitor calculation data for monitoring the line quality in real time contains an error, and There is a problem that the TCA report also occurs at the wrong time.

An object of the present invention is to improve the accuracy of calculation data and the like.

[0033]

FIG. 1 is an explanatory view of the principle processing flow of the present invention. First, in the first aspect of the present invention, a normal buffer and a spare buffer for storing the calculation data of each calculation item are provided.

When the calculation item is fixed, the calculation data of the fixed item is directly stored in the regular buffer, but when the calculation item is not fixed, the calculation data of the preset item is stored in the corresponding spare buffer. The calculated data of the confirmed item is added to the corresponding regular buffer from the spare buffer, and the calculated data stored in all the spare buffers is cleared to zero.

The second aspect of the present invention is directed to operation item coding.
The violation is such that the computation is stopped while the above-mentioned Sivialii Unavailable Second and Unavailable Second are in the computation state.

In the third aspect of the present invention, the calculation item errored seconds and civially unavailable seconds are arranged so that the calculation is stopped while the unavailable seconds are in the calculation state.

According to a fourth aspect of the present invention, the calculation item unavailable seconds is such that, when the above-mentioned serially unavailable seconds are continuously in the calculation state for a predetermined time, the civilian When the operation data 0 of the available seconds continues for the predetermined time, the operation is performed up to a time point before the predetermined time.

Next, the principle of the first to fourth aspects of the present invention will be described with reference to FIG. 1. In the present invention, CV, ES, SES, UAS, SEFS
A spare buffer is provided in addition to the regular buffer for each item of
When the calculation item is uncertain, the calculation data is temporarily stored in the spare buffer.

Then, when the calculation items are fixed, the calculation data of the fixed items are added from the spare buffer to the corresponding normal buffer, and then the calculation data stored in all the spare buffers are cleared to zero.

Now, the quality of the transmission line is monitored,
The number of errors (CV value) is 0 or a very small value if no failure (transmission line disconnection, device failure, etc.) occurs.
This value increases if a failure occurs.

Therefore, how much the failure affects the line quality is periodically judged and processed according to the flow of FIG. That is, the CV obtained in step S1 of FIG.
Compare the value with the preset threshold value, and if the CV value is smaller than the threshold value, the calculation item is CV as in the conventional example.
And ES, and the spare buffer is not used. Then, based on the operation data, it is determined whether or not to generate the TCA report (see steps S1-Y, S2, S6).

However, if the CV value is larger than the threshold value, each item of ES, SES, and UAS becomes the calculation factor. Which of the three items becomes the calculation target at the time of failure occurrence? Is not confirmed.

Therefore, the operation data is added to the spare buffers of these items, and the operation data of the item determined when the operation item is determined is added from the spare buffer to the corresponding regular buffer to save all the spare buffers. Clear 0 (see steps S3 to S5).

Then, similarly to the CV item, it is determined whether or not to send the TCA report. Also, as a performance monitor calculation method, CV items are SES items, USA
When the item is calculating, it does not calculate (count), and ES and SES items do not calculate when the UAS item is calculating.

Furthermore, regarding the method of calculating UAS items, see SE
When the S item is continuously calculated for a predetermined time (for example, 10 seconds), the SES item 0
The UAS calculation period is set to the first 0 seconds when the clearing continues for a predetermined time (for example, 10 seconds).

That is, by using the calculation method using the spare buffer, the calculated data is added to the spare buffer until the calculation item is determined, and when the calculation item is confirmed, the calculated data of the confirmed item is handled from the spare buffer. Added to the regular buffer.

Therefore, there is no time lag between the actual calculation start time and the actual calculation end time, and the accuracy of real-time data and TAC report can be improved as compared with the conventional example.

[0048]

FIG. 2 is an example of a main part configuration diagram of each part for realizing FIG. 1, FIG. 3 is an explanatory view (part 1) of first to fourth embodiments of the present invention, and FIG. It is explanatory drawing (the 2) of the Example of 1st-4th this invention.

2 to 4, the parts described in detail above will be briefly described, and the parts of the present invention will be described in detail. In addition, the definition of the calculation items corresponding to the new regulation and the mutual relation and the definition of TCA are as follows.・ CV The number of errors that occurred in 1 second. However, SES
It does not count when the UAS is calculating the time.
(Unit: pieces) ・ ES 1 counts 1 second when a CV value of 1 or more occurs as 1 ES. However, it is not counted when the UAS is calculating the time. (Unit: seconds) ・ SES Counts one second when a specified CV value or more (the number of errors above a certain level) occurs as 1 SES. However, it does not count when the UAS is counting time. (Unit: seconds) ・ 10 when the UAS SES has counted the time continuously for 10 seconds.
The UAS counting period is from 1 second before the second to the first 0 seconds when the SES 0 count continues for 10 seconds.
(Unit: seconds) ・ SEFS 1 second with 1 or more synchronization deviations
Count as 1 SEFS. (Calculation factor is independent of CV)
(Unit: seconds) ・ TCA report Same as the description of the conventional example Here, since the CV value is calculated even when the signal is disconnected,
It deviates from the actual value. Therefore, in the example, CV item, ES
In order to make the values of items and SES items as close as possible to the actual values, the above proviso has been added.

First, the calculation of the embodiment in the performance monitor will be specifically described. The above-mentioned "number of errors above a certain level" is, for example, 5 or more.
(a), the area above the dotted line in FIG. 4 (a), and the scale on the horizontal axis is 5 seconds in the case of FIG. 3 and 1 second in the case of FIG.

In FIG. 2, a spare buffer 15 is newly provided for the part different from the example of the main part configuration diagram of the conventional example shown in FIG.
The calculation data is added to the spare buffer until the item to be calculated is fixed, and when the item is fixed, the calculation data is added to the corresponding regular buffer 14 from the spare buffer and the calculation is started. It was made so that there would be no time lag between the time and the end of calculation.

The procedure shown in FIG. 1 is stored in the program ROM 12a shown in FIG. In FIG. 3, the upward arrow indicates that the item to be calculated is determined and the calculated data (that is, the count value) in the spare buffer is added to the normal buffer. The count value of the regular buffer at that time is a value obtained by adding the count value of the spare buffer to the current count value.

That is, the normal buffer portion adds the operation data of the confirmed operation items, and the spare buffer portion adds the operation data of the related items while the operation items are in an indeterminate state. When the item is fixed, the calculated data of the fixed item is added from the spare buffer to the corresponding normal buffer, and the calculated data of all the spare buffers are cleared to 0 to prepare for the next calculation.

A specific calculation method will be described below with reference to FIG.・ In the case of Figure 3 (a) (CV value that does not exceed the threshold value occurs continuously for 15 seconds) Since the collected CV value is smaller than the threshold value, only the CV item and ES item are confirmed as calculation items. , Without going through the spare buffer,
The CV value and ES value are directly stored in the normal buffer.

In addition, ↓ shows the calculated data of the CV value at that time.
Indicates that the TCA report was sent because the TCA value was exceeded.
(See steps S1, S2, S6 in Figure 1).・ In the case of Fig.3 (a)-(CV value exceeding the threshold value occurs continuously for 5 seconds) Since the collected CV value is larger than the threshold value, ES item, SES
Items and UAS items are calculated items, and the items to be calculated have not been decided. Therefore, the calculation data is added to the spare buffer of the related item until the item to be calculated is determined.

In this case, since the CV value became 0 in 5 seconds,
The ES item and the SES item are determined, the operation data from the spare buffers of these items are added to the corresponding normal buffer, and the spare buffers of the above three items are cleared to 0 to prepare for the next operation.・ In the case of Figure 3 (a)-(After exceeding the threshold value continuously for 10 seconds or more, it becomes below the threshold value for 5 seconds, but the CV value above the threshold value for 5 seconds occurs again) Since the CV value in (b) exceeds the threshold value, ES item, SES
Calculation data is added to the spare buffer of items and UAS items, but since this state continues for 10 seconds or longer, the UAS item is confirmed as the calculation item.

As a result, the UAS item adds the operation data from the spare buffer to the normal buffer, and clears the spare buffer of the above three items to zero. After that, UAS items are added to the regular buffer without using the spare buffer. However, the calculation item became uncertain because the CV value was below the threshold in the part (b). In this case, the CV item, ES item, and UAS item are calculated items (the same as in the conventional example), so the spare buffer for these items is used.

The reason why the UAS item becomes a calculation item is
Since the UAS item is only restored temporarily and the UAS item is restored only after 10 consecutive seconds, in this case, the UAS item is not considered to be restored and the UAS item is continuing. In other words, in this case, the UAS item is 5 seconds (for restoration of 10 seconds or less)
Therefore, the UAS item becomes a calculated item.

However, after 5 seconds, the CV value again exceeded the threshold value, so the operation data in the spare buffer of the UAS item is added to the normal buffer, the spare buffers of the three items are cleared to 0, and the next calculation is performed. Prepare for

Although ↓ has sent the TCA report of the UAS item at that time, it is 95 seconds later in FIG. 7 of the conventional example, whereas it is 10 seconds shorter than 85 seconds in FIG. Also,
In the part (c), the data in the UAS item spare buffer is added to the normal buffer, but the CV value collected after 5 seconds became 0. Therefore, add 10 seconds of data in the spare buffer and completely set it to 0. Check that it has become.

As a result, from the definition of the UAS item, the counting period of the UAS item is from 65 seconds to 105 seconds, as shown in FIG.
Match the time domain of.・ In the case of Fig. 3 (a)-(a), the operation data of CV items and ES items are added to the normal buffer as in the case of, but the part of (b) is the same as in the case of , ES item, SES item, UAS item, and the operation data is added to the corresponding spare buffer.

Since the value becomes less than or equal to the threshold value in the part (c), the operation data is added to the normal buffer in the CV item, and the operation data in the spare buffer is added to the normal buffer in the ES item and the SES item. , Clear the spare buffer to 0. The UAS item clears the spare buffer to 0.

After that, the threshold value was exceeded in part (d).
Until the CV value exceeds 10 seconds, the calculation data is added to the ES, SES, and UAS item spare buffers.However, when the CV value exceeds 10 seconds, the UAS item is confirmed and the UAS item spare buffer data is normalized. Add to the buffer and clear the ES item and the spare buffer of the SES item to 0.

Then, while the portion (d) exceeds the threshold value, the data is added to the normal buffer of the UAS item. However, since the portion (e) becomes less than the threshold value, the CV item,
The calculation data is added to the spare buffer of the ES item and UAS item, but when the time exceeds 10 seconds, the calculation item is confirmed as the CV item and ES item, and the calculation data of the spare buffer is added to the corresponding regular buffer, and The spare buffers for these three items are cleared to 0. In addition, CV items and ES items are stored in the regular buffer.
Add the operation data of (e).

In FIG. 4, when the collected CV values are as shown in FIG. 4 (a), since the part (a) is below the threshold value, the confirmed CV item and ES item are directly in the normal buffer, Add the calculation data.

Since the portion (b) is above the threshold value, the calculation item is not determined, and the ES item, SES item, and UAS item are added with the corresponding calculation data in the spare buffer. (C)
Since the part of is below the threshold value, the confirmed CV item is the normal buffer, and the operation data of part (c) is added to the operation data of part (b), and the ES item is the operation data of the spare buffer in the normal buffer. And add the time in the regular buffer. The ES item, SES item, and UAS item clear the corresponding spare buffer to 0.

As in the case of (b), the calculation items are not fixed in the part (d), so the calculation data is added in the spare buffer for the ES item, SES item, and UAS item, but it is confirmed that it continues for 10 seconds or more. At that time, the spare buffers of the ES item and SES item are cleared to 0, the spare buffer of the UAS item is added to the normal buffer, and then the operation data is added in the normal buffer.

Since (e) and (f) are below the threshold, U
Since the AS item checks for the possibility of deviation from the calculation item, the CV item and ES item are the calculation item targets, so add the calculation data in the spare buffer respectively.

Since the part (g) exceeds the threshold value, the UAS item judges that the part (d) is continued and adds the operation data of the spare buffer to the normal buffer, but the CV item and the ES item Is not counted during UAS item calculation, so clear buffer (by definition) to 0.

Since the portion (h) becomes less than the threshold value, the CV value and the ES value are added with the operation data in the spare buffer. When the UAS item detects that the threshold value or less continues for 10 seconds, it clears the backup buffer to 0, so the counting period of the UAS item is between the two ▽ s in Figure 4- (e).
In addition, in response to clearing 0 in the reserve buffer of the UAS item,
For CV items and ES items, the calculated data in the spare buffer is added to the normal buffer.

That is, by using the calculation method using the spare buffer, the calculated data is added to the spare buffer until the calculation items are fixed, and when the data is fixed, each spare buffer is added to the normal buffer. There is no time lag between the count start time and the count end time, and the accuracy of real-time data and TAC reports can be improved compared to the conventional example.

[0072]

As described in detail above, according to the present invention, it is possible to improve the accuracy of calculation data and the like.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a principle processing flow of the present invention.

FIG. 2 is an example of a main part configuration diagram for realizing FIG.

FIG. 3 is an explanatory diagram (1) of the first to fourth embodiments of the present invention.

FIG. 4 is an explanatory view (No. 2) of the first to fourth embodiments of the present invention.

FIG. 5 is an explanatory diagram of a calculation processing flow of a conventional example.

6 is an example of a main part configuration diagram for realizing FIG. 5;

FIG. 7 is a diagram (part 1) for explaining the performance monitor calculation method of the conventional example, where (a) is an example of collected CV values corresponding to the passage of time, (b) is a CV item calculation explanatory diagram, and (c) is ES. Item calculation explanatory diagram, (d) SES item calculation explanatory diagram, (e) is UAS item calculation explanatory diagram, (f) is a SEFS item calculation explanatory diagram.

FIG. 8 is a diagram (part 2) for explaining a conventional performance monitor calculation method, where (a) is an example of collected CV values corresponding to the passage of time, (b) is a CV item calculation explanatory diagram, and (c) is ES. Item calculation explanatory drawing, (d) SES item calculation explanatory drawing, (e) is UAS item calculation explanatory drawing, (f) is a SEFS item calculation explanatory drawing.

[Explanation of symbols]

11 CPU 12a, 12b Program ROM 13 RAM 14 Normal buffer 15 Spare buffer

   ─────────────────────────────────────────────────── ─── Continued front page       (56) Reference JP-A-2-118739 (JP, A)                 JP-A-58-14641 (JP, A)                 JP-A-5-153243 (JP, A)                 JP-A-10-51446 (JP, A)                 Japanese Patent Laid-Open No. 10-303867 (JP, A)

Claims (4)

(57) [Claims] 1. A performance item using a calculation item determination standard, the number of errors collected per unit time, and a coding violation of a preset calculation item, an errored second, a serially unavailable second, and an unavailable second. In a transmission quality management system that performs monitor calculation and manages transmission quality using the obtained calculation data, when a calculation item is confirmed by providing a regular buffer and a spare buffer that store the calculation data of each calculation item Stores the calculation data of the confirmed item directly in the regular buffer, but when the calculation item is uncertain, the calculation data of the preset item is stored in the corresponding spare buffer, and the item is confirmed when the item is confirmed. After adding the calculated data of from the spare buffer to the corresponding regular buffer, Performance Monitor calculation method is characterized in that the operation data stored in the pre-buffer the manner cleared to zero. 2. The calculation item coding violation is the above-mentioned Sicily Unavailable.
The performance monitor calculation method according to claim 1, wherein the calculation is stopped while the second and the unavailable seconds are in the calculation state. 3. The performance according to claim 1, wherein the operation item errored seconds and civially unavailable seconds are arranged to suspend the operation while the unavailable seconds are in the operation state.・ Monitor calculation method. 4. The calculation item unavailable second is a calculation of a serially unavailable second from a point before the predetermined time when the serially unavailable second is in a calculation state continuously for a predetermined time. A performance monitor calculation method, wherein when data 0 continues for the predetermined time, the data up to the time before the predetermined time is calculated.