CN101106444A - Method for real test of error code class in data transfer circuit - Google Patents
Method for real test of error code class in data transfer circuit Download PDFInfo
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- CN101106444A CN101106444A CNA2006100896772A CN200610089677A CN101106444A CN 101106444 A CN101106444 A CN 101106444A CN A2006100896772 A CNA2006100896772 A CN A2006100896772A CN 200610089677 A CN200610089677 A CN 200610089677A CN 101106444 A CN101106444 A CN 101106444A
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Abstract
The invention discloses a method for real-time testing the error level in data transmission circuit, including: (1) in the designated time interval, measure the total bit mount of the valid data frames transmitted in the data transmission circuit, and simultaneously measure the error bit mount of the dummy frames transmitted in the designated time interval; (2) according to the designated time interval, the total transmission rate of the data transmission circuit and the measured total bit mount of the valid data frames, calculate the total bit mount of the dummy frames transmitted in the designated time interval; (3) according to the bit mount in the dummy frames and the calculated total bit mount transmitted in the dummy frames, calculate the quotient thereof to obtain the error rate at bit level in the data transmission circuit. The invention reduces the complexity of data processing, and the testing accuracy is high. The invention can realize the on-line monitoring of the error level of data circuit.
Description
Technical field
The present invention relates to the method for testing of the error rate in a kind of transfer of data, relate in particular to the method for real test of error code class in a kind of data transmission circuit, monitor in real time to realize on-line monitoring.
Background technology
In digital communication, the error rate is a main standard of check data transmission equipment and channel work quality thereof, is to weigh the data index of transfer of data accuracy at the appointed time.In the conventional data communications circuit, custom waits with Packet Error Ratio (PER) carries out the circuit transmission quality evaluation.Though Packet Error Ratio also can not satisfy the requirement of client that quality test is had relatively high expectations to transmission circuit as the index of weighing the circuit transmission quality.
At present in the wired data communication system, HDLC (the High Level Data LinkControl that adopt more, High-Level Data Link Control) agreement, SDLC (Synchronous Data LinkControl, synchronous data-link control) agreement, PPP (Point to Point Protocol, point-to-point protocol) or frame relay protocol etc.Be to use Packet Error Ratio to wait to the estimation approach of the performance of the data transmission circuit that adopts above-mentioned agreement and estimate,, be difficult to it and traditional BIT error code equivalence because length of data package is unfixing.Bit error rate is meant the wrong amount of information that receives shared ratio in transmitting informational capacity, also is the amount of information probability that quilt is lost in transmission system of code element.And present data circuit, particularly the grade of service of big customer's data circuit is represented by the BIT error code class.Therefore, present service provider can not provide real-time online error code class data well, does not satisfy user's requirement.
At present, test for bit error rate in the data transmission circuit, all data volumes of transmission that adopt are added up more, and be the examination of broken string drive test, can not on-line testing, can't deny that such method of testing measuring accuracy is higher, but the rapid lifting that test mode can not provide online real-time testing to cause testing cost, this also is the main cause that the service provider is reluctant to provide BIT error code class parameter.
Summary of the invention
At existing problem and shortage in the test method for bit error rate in the above-mentioned available data transmission circuit, the purpose of this invention is to provide a kind of method that realizes real test of error code class in simple, the lower-cost data transmission circuit.
The present invention is achieved in that the method for real test of error code class in a kind of data transmission circuit, may further comprise the steps:
(1) in the time interval of setting, measures the total bit amount of the valid data frame that transmits in the described data transmission circuit, measure bit amount wrong in the empty Frame that transmits in the time interval of this setting simultaneously;
(2) according to setting-up time at interval, the overall transmission rate of data transmission circuit and the total bit amount of valid data frame measured calculate the total bit amount of transmission of empty Frame in time interval of described setting;
(3) according to the total bit amount of the transmission of the empty Frame that calculates in wrong bit amount and the step (2) in the empty Frame of measuring in the step (1), calculate its merchant and promptly draw the bit level error rate in the data transmission circuit.
Wherein, the total bit amount of the transmission of described step (2) hollow Frame obtains by following steps:
A, according to the average transmission rate of the total bit of the Frame of measuring in the step (1) amount calculated data frame and total speed of described data transmission circuit, calculate the ratio of this two speed, promptly draw the average channel occupancy of Frame in described data transmission circuit;
B, determine the average channel occupancy of empty Frame according to the channel seizure ratio that calculates in the steps A, and the average channel occupancy of calculating clearancen Frame, calculate the long-pending average transmission rate that promptly calculates the clearancen Frame of the average channel occupancy of total speed of described data transmission circuit and empty Frame again, calculate the total bit amount of transmission of empty Frame again according to the time interval amount of setting.
Wherein, the total bit amount of the transmission of described step (2) hollow Frame also can obtain by following steps:
A, to setting-up time at interval, the overall transmission rate quadrature of data transmission circuit, draw setting-up time at interval in total bit transmission quantity of data transmission circuit;
B, total bit transmission quantity of data transmission circuit and the total bit amount of valid data frame are made the total bit amount of transmission that difference promptly obtains the sky Frame.
Wherein, described data transmission circuit comprises the data transmission circuit of having used High level data link control, synchronous data link control, point-to-point protocol or frame relay protocol.
Wherein, the step that wrong bit measures in the total bit of measured data frame amount and the empty Frame in described data transmission circuit in the described step (1) is as follows:
A, be set in the time of measuring in the described data transmission circuit, simultaneously the data of transmitting in the described data transmission circuit judged,, then enter step B, otherwise enter step C if continuous OX7E byte occurs;
B, each byte in the byte stream of transmission is compared with OX7E respectively, measure bit wrong in the byte of transmission, the statistics that adds up finished up to the setting measurement time;
The quantity of the Frame in C, the measurement transmission data, the total bit that calculates transmission measures, and the statistics that adds up finished up to the setting measurement time.
When the BIT error rate of data transmission circuit was tested, the empty frame that sends when the present invention is directed to channel idle was added up, and utilized the BIT error rate in the empty frame transmission course as the transmission quality index of data transmission circuit.So just significantly reduced the complexity of data processing, and measuring accuracy is basic and the BIT error rate equivalence of valid data or whole data test.Present invention can be implemented in the error code class of line Monitoring Data circuit, business is not disconnected the back test and do not need to resemble traditional method, this method also can be used for the interrupting service test simultaneously.The present invention realizes simply, testing cost is lower.
Description of drawings
Fig. 1 is a BIT error rate test flow chart of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention includes following steps:
At first, calculate the Mean Speed V_use=N_use/T_test of valid data according to the Measuring Time T_test that sets and total bit flow N_use of valid data frame.
Calculate the average occupancy P_use of data of valid data frame again according to the setting speed V of data transmission circuit, then P_use=V_use/V.The average occupancy of empty Frame then be 1-P_use, and V * (1-P_use) then is that the total bit of empty data frame transfer measures.
Suppose that the mistake bit quantity that records in the Measuring Time T is N_errall, then mistake bit leads P_err=N_errall/ (V * (1-P_use)) in the data transmission circuit.
The bit error rate of the present invention also can be calculated by following method:
P_err=N_errall/ (N_all-N_use), wherein, N_errall is the total bit error code number in the testing time, and N_all is the total Bit data number in the testing time, and N_use is the total valid data frame Bit data number in the testing time.Wherein, the calculating of N_all has two kinds of methods:
1, accurate counting method is come actual count to the total bit in the testing time with counting module; Its advantage is that counting is accurate, and shortcoming is to increase some costs, needs count all BIT in the data transmission circuit, and this needs the overhead of processor.
2, the estimation technique is because the precision of existing track data speed still than higher, can be estimated with the product of testing time and line speed.Be N_all=V * T_test.Wherein T_test is the testing time, and V is the known speed of circuit.Advantage be implementation more simply, shortcoming be low precision a bit.
Be the computational methods that mistake bit leads P_err in the example description of step 108 with the E1 circuit below.
Suppose that the N_err that records is 5, Measuring Time T is 1 second unit interval, and total bit flow N_use of the valid data frame that records is 2,000,000bit, and the speed of E1 circuit is 2M/s, P_use=2 then, 000,000 ÷ 2,048,000;
P_err＝5÷(2048000×(1-2,000,000÷2,048,000))
＝1.04E-4。
Perhaps, directly calculate by following formula:
P_err＝5÷(2048000-2,000,000)＝1.04E-4
The E1 circuit-line error rate of above-mentioned measurement is 1.04E-4, and error code class is-4.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those skilled in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (5)
1. the method for real test of error code class in the data transmission circuit is characterized in that this method may further comprise the steps:
(1) in the time interval of setting, measures the total bit amount of the valid data frame that transmits in the described data transmission circuit, measure bit amount wrong in the empty Frame that transmits in the time interval of this setting simultaneously;
(2) according to setting-up time at interval, the overall transmission rate of data transmission circuit and the total bit amount of valid data frame measured calculate the total bit amount of transmission of empty Frame in time interval of described setting;
(3) according to the total bit amount of the transmission of the empty Frame that calculates in wrong bit amount and the step (2) in the empty Frame of measuring in the step (1), calculate its merchant and promptly draw the bit level error rate in the data transmission circuit.
2. definite method of error code class is characterized in that in the data transmission circuit according to claim 1, and the total bit amount of the transmission of described step (2) hollow Frame obtains by following steps:
A, according to the average transmission rate of the total bit of the Frame of measuring in the step (1) amount calculated data frame and total speed of described data transmission circuit, calculate the ratio of this two speed, promptly draw the average channel occupancy of Frame in described data transmission circuit;
B, determine the average channel occupancy of empty Frame according to the channel seizure ratio that calculates in the steps A, and the average channel occupancy of calculating clearancen Frame, calculate the long-pending average transmission rate that promptly calculates the clearancen Frame of the average channel occupancy of total speed of described data transmission circuit and empty Frame again, calculate the total bit amount of transmission of empty Frame again according to the time interval amount of setting.
3. definite method of error code class is characterized in that in the data transmission circuit according to claim 1, and the total bit amount of the transmission of described step (2) hollow Frame obtains by following steps:
A, to setting-up time at interval, the overall transmission rate quadrature of data transmission circuit, draw setting-up time at interval in total bit transmission quantity of data transmission circuit;
B, total bit transmission quantity of data transmission circuit and the total bit amount of valid data frame are made the total bit amount of transmission that difference promptly obtains the sky Frame.
4. according to definite method of error code class in claim 2 or the 3 described data transmission circuits, it is characterized in that described data transmission circuit comprises the data transmission circuit of having used High level data link control, synchronous data link control, point-to-point protocol or frame relay protocol.
5. according to the method for real test of error code class in claim 2 or the 3 described data transmission circuits, it is characterized in that the step that wrong bit measures in the total bit of measured data frame amount and the empty Frame in described data transmission circuit in the described step (1) is as follows:
A, be set in the time of measuring in the described data transmission circuit, simultaneously the data of transmitting in the described data transmission circuit judged,, then enter step B, otherwise enter step C if continuous OX7E byte occurs;
B, each byte in the byte stream of transmission is compared with OX7E respectively, measure bit wrong in the byte of transmission, the statistics that adds up finished up to the setting measurement time;
The quantity of the Frame in C, the measurement transmission data, the total bit that calculates transmission measures, and the statistics that adds up finished up to the setting measurement time.
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| CN2006100896772A CN101106444B (en) | 2006-07-11 | 2006-07-11 | Method for real test of error code class in data transfer circuit |
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| CN2006100896772A CN101106444B (en) | 2006-07-11 | 2006-07-11 | Method for real test of error code class in data transfer circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995500A (en) * | 2009-08-12 | 2011-03-30 | 特克特朗尼克公司 | Test and measurement instrument with bit-error detection |
| CN102594470A (en) * | 2012-03-12 | 2012-07-18 | 哈尔滨工业大学 | Method for obtaining data communication bit error rate in a real-time online manner |
| CN104579531A (en) * | 2014-12-26 | 2015-04-29 | 中国电子科技集团公司第二十研究所 | Data link unrepeatered networking method |
| CN106788675A (en) * | 2016-12-05 | 2017-05-31 | 中国资源卫星应用中心 | Using the method for null frame data statistics satellite in orbit initial data error code |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US3824548A (en) * | 1973-01-15 | 1974-07-16 | Us Navy | Satellite communications link monitor |
| JP3123975B2 (en) * | 1998-04-23 | 2001-01-15 | 埼玉日本電気株式会社 | Bit error rate measuring method, measuring circuit, and receiving apparatus |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995500A (en) * | 2009-08-12 | 2011-03-30 | 特克特朗尼克公司 | Test and measurement instrument with bit-error detection |
| CN101995500B (en) * | 2009-08-12 | 2014-09-17 | 特克特朗尼克公司 | Test and measurement instrument with bit-error detection |
| CN102594470A (en) * | 2012-03-12 | 2012-07-18 | 哈尔滨工业大学 | Method for obtaining data communication bit error rate in a real-time online manner |
| CN102594470B (en) * | 2012-03-12 | 2014-01-08 | 哈尔滨工业大学 | Method for obtaining data communication bit error rate in a real-time online manner |
| CN104579531A (en) * | 2014-12-26 | 2015-04-29 | 中国电子科技集团公司第二十研究所 | Data link unrepeatered networking method |
| CN104579531B (en) * | 2014-12-26 | 2017-08-29 | 中国电子科技集团公司第二十研究所 | The non-relay network-building method of Data-Link |
| CN106788675A (en) * | 2016-12-05 | 2017-05-31 | 中国资源卫星应用中心 | Using the method for null frame data statistics satellite in orbit initial data error code |
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