JPH01112833A - Error rate measuring instrument - Google Patents

Abstract

PURPOSE:To more quickly decide an error rate having changed even if the error rate changes in a short time by counting an error occurring within respective counting time divided into definite intervals, and storing it in order, and deciding the error rate from a result that the definite number of errors are added in order from the latest error, at every termination of the counting of the error. CONSTITUTION:An error count circuit 1, which is set at zero by an initialize signal 02 from a counting time setting circuit 2 at the time of the start of error counting, counts the error, occurring within the respective counting time of 1/n of a traditional one, by an error signal 01. After the counting is finished, the number of errors 04 is stored in an error storage circuit 3 by a store instruction 03. Further, this operation is repeated for every counting time, and the error storage circuit 3 always stores n-pieces of the number of errors 05 in turn from the latest one. Every time the stored number of errors 05 is changed at every termination of the counting time, they are added by an addition circuit 4. Next, an error rate decided result 07 is obtained by an error rate decision circuit 5 from the added result 06.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an error rate measuring device for a digital transmission device.

[Conventional technology]

An example of a conventional error rate measuring device is shown in FIG. 2 and will be described.

In the figure, 11 is an error counting circuit that counts error signals 001, and 12 is an initial setting signal 00 to this error counting circuit 11.
2 is a counting time setting circuit that supplies 1, and 13 is an error counting circuit 1.
This is an error rate determination circuit that receives an output of 1 as an input.

Then, the error counting circuit 11 counts errors occurring within each counting time divided by the counting time setting circuit 12,
The error rate determination circuit 13 directly obtains the error rate determination result 004 from the number of individual errors 003. [Problems to be solved by the invention] is low, that is, when the set counting time is long, it is impossible to determine the error rate after determining the error rate from the number of counted errors until the next error/event determination. Therefore, there is a problem in that when an actual error event changes in a short time, there is a large delay in determining the changed error event.

[Means for solving problems]

The error measuring device of the present invention is used to measure errors in a digital transmission system, and includes an error counting circuit that counts error signals, a counting time setting circuit that supplies an initial setting signal to this error counting circuit, and a counting time setting circuit that supplies an initial setting signal to this error counting circuit. An error storage circuit that receives a storage command from the setting circuit and stores the number of errors from the error counting circuit; an addition circuit that adds the outputs of the error storage circuit; and a judgment based on the addition result obtained by this addition circuit. It is equipped with an error/occurrence judgment circuit that obtains results, counts errors that occur within nine counting times divided at regular intervals, stores them in order, and stores them in order from the newest one every time counting of errors is completed. By determining an erroneous event based on the result of adding up a fixed number of erroneous errors, even if the erroneous event changes in a short period of time, the changed erroneous event can be determined more quickly.

[Operation] In the present invention, when the number of errors to be measured is low, the number of errors per counting time of conventional B is calculated in order from the newest one to n.
Errors are determined from the result of adding them each time the error count is completed.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing an embodiment of an error measuring device according to the present invention.

In the figure, 1 is an error counting circuit that counts error signals 01, 2 is a counting time setting circuit that supplies an initial setting signal 02 to this error counting circuit 1, and 3 is an error counter that receives a storage command 03 from this counting time setting circuit 2. An error storage circuit that stores the error number 04 from the counting circuit 1; 4 an adder circuit that adds the output of the error storage circuit 3; 5 an error storage circuit that obtains a judgment result based on the addition result obtained by the adder circuit 4; This is an event judgment circuit. Note that 05 indicates n false counts in descending order, 06 indicates the sum of n false counts, and 07 indicates the false event determination result.

Then, the errors that occur within each counting time divided at regular intervals are counted and stored in order, and each time the counting of errors is completed, a fixed number of errors are added in order from the newest one. By determining an error, even if the error occurs in a short period of time, the changed error rate can be determined quickly.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

First, the error counting circuit 1 is set to zero by the initial setting signal 02 from the counting time setting circuit 2 when error counting starts.
The error signal 01 counts the errors that occur within each counting period of 1/, and after the counting is completed, the error count 04 is stored in the error storage circuit 3 according to the storage command 03. Furthermore, this operation is repeated for each counting time, and the error storage circuit 3 always stores the n number of errors 05 in order from the newest one.
Every time the erroneous number 05 stored at the end of each counting time is changed, these are added by an adding circuit 4.

Next, from the addition result 06 (sum of n false counts), the error rate determination circuit 5 obtains the error rate determination result 07.

〔Effect of the invention〕

As explained above, (1) the present invention is capable of detecting errors in a digital transmission system when the number of errors to be measured is low in this measuring instrument, the number of errors per measurement time (4) in order from the newest to Kn. Error 5 is determined by memorizing the error count and adding it up each time the error count is completed.
Even if 4 changes in a short period of time, the resulting error can be determined quickly (compared to the conventional 4 time interval).

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an error measuring device according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional error measuring device. 1: Miscellaneous error counting circuit, 2nd eye: counting time setting circuit,
3... Incorrect) Memory circuit, 4... Addition circuit, 5...
...Error detection circuit.

Claims (1)

[Claims] In error rate measurement of a digital transmission system, there is an error counting circuit that counts error signals, a counting time setting circuit that supplies an initial setting signal to this error counting circuit, and an error counting circuit that receives a storage command from this counting time setting circuit. an error storage circuit that stores the number of errors from the error storage circuit; an addition circuit that adds the outputs of the error storage circuit; and an error rate determination circuit that obtains a determination result based on the addition result obtained by the addition circuit. , the errors that occur within each counting time divided at regular intervals are counted and stored in order, and each time the counting of errors is completed, the error rate is calculated from the result of adding a certain number of errors in order from the newest one. An error rate measuring device characterized in that by determining the error rate, even if the error rate changes in a short time, the changed error rate can be determined more quickly.