CN101322324B - Method and apparatus for testing longitudinal balance degree of link - Google Patents
Method and apparatus for testing longitudinal balance degree of link Download PDFInfo
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- CN101322324B CN101322324B CN2007800004142A CN200780000414A CN101322324B CN 101322324 B CN101322324 B CN 101322324B CN 2007800004142 A CN2007800004142 A CN 2007800004142A CN 200780000414 A CN200780000414 A CN 200780000414A CN 101322324 B CN101322324 B CN 101322324B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/30—Reducing interference caused by unbalanced currents in a normally balanced line
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Abstract
Method and device for testing degree of line longitudinal balance is to solve problem of long testing time in the prior art one and problem of non-line imbalance factor having great influence on testing result in the prior art two. The method includes the following steps: determining reliable common mode amplitude of each frequency point to be tested; grouping every frequency point into one group based on characteristic of line to be tested and said reliable common mode amplitude, and respectively computing degree of line longitudinal balance of each frequency point in every group. According to present invention, testing time is reduced, and real balance status of line is well and truly reflected.
Description
Technical field
The present invention relates to field of telecommunication networks, particularly relate to a kind of method and device of testing longitudinal balance degree of link.
Background technology
In the telecommunication service field; Operator is through local cable (normally twisted-pair feeder); To the user broad band telecommunication service and arrowband telecommunication service are provided simultaneously; Professional like ADSL over POTS (plain old telephone increase ADSL), ADSL over ISDN (ISDN establishes ADSL newly), VDSL over POTS (plain old telephone increase VDSL), VDSL over ISDN (ISDN establishes VDSL newly) etc., it is quite general that such is applied in home and overseas.(among this paper, ADSL, VDSL being referred to as xDSL)
As shown in Figure 1; XDSL signal and POTS/ISDN signal coexistence are in a user outline; In the local side side, the separator (SPL) in the interoffice broadband device (DSLAM) comes wide, narrow traffic differentiation, is sent to broadband services plate (xDSL business board) respectively and narrowband service board (POTS/ISDN business board) is handled; And distolateral the user, the separator in the interoffice broadband device then is sent to user side RTU and phone with isolated wide, narrow band service.
In this type of professional operation and maintenance process; If there is the user to declare fault, then often need measure (as: line voltage distribution parameter, line resistance parameter, line capacitance parameter, line frequency response, circuit background noise, the line-to-ground degree of balance etc.) to the subscriber's line parameter.According to these supplemental characteristics, can judge the quality and the failure condition of circuit.
In the maintenance process of this system, longitudinal balance degree is used for weighing circuit longitudinal balance performance, i.e. the uneven performance of line-to-ground.The circuit longitudinal balance degree is an important indicator weighing line quality when circuit is used for high speed data transfer; This mainly be because: the line-to-line that it is right that the line-to-ground imbalance possibly cause line exists potential to ground poor; And then in line-to-line formation electromotive force loop; Produce loop current, thereby cause extra interference.Because the existence in electromotive force loop can form electromagnetic field around circuit, cause a large amount of external interference to be coupled in the circuit, influences proper communication.At present, stipulated to open the professional requirement of ADSL in the national standard: professional for ADSL, in the 26kHz-1104kHz scope, longitudinal conversion loss is not less than 50dB, allows greater than 40dB under special circumstances.
Longitudinal balance degree Bm-1 is defined as:
Bm-1＝20lg(E1/Em)(dB)
Em in the above-mentioned formula is called lateral voltage, and referring to shown in Figure 2, the electrical potential difference between promptly circuit TIP and RING line end give is also claimed the differential mode amplitude.E1 is called longitudinal voliage, cause by TIP, the unbalanced to ground of RING line end, E1 equal R1 left end potential to ground difference and R2 left end potential to ground difference vector and 1/2, also claim the common mode amplitude.
Referring to shown in Figure 2, the computing formula of longitudinal balance degree is in theory:
Generally speaking, need carry out longitudinal balance degree test, need comprise but be not limited to the longitudinal balance degree of each tone frequency each frequency of ADSL whole frequency.The frequency that promptly need measure longitudinal balance degree includes but not limited to the center frequency point of each tone.
Because the existence of noise and other logicalnot circuit unbalanced factors causes circuit V
cTest in fact might be much larger than the differential mode amplitude that causes owing to the circuit imbalance.If the differential mode amplitude that the circuit imbalance causes is V
c', the differential mode amplitude that logicalnot circuit unbalanced factor (like noise etc.) causes is V
n, then the longitudinal balance degree computing formula of actual track is:
In actual track, can be similar to and think V
nInfluence fluctuates in a fixed interval to longitudinal balance degree.
Usually the hardware designs that adopts at present is to send out common-mode signal, error of measurement mould signal.Referring to shown in Figure 3; Digital signal processing module DSP produces modulation signal and gives D/A, and the D/A device sends on the practical differential circuit after converting the common mode analog signal into, because the existence of circuit unbalanced factor; The differential lines virtual voltage is unequal; Have electrical potential difference, this differential signal becomes the standard deviation sub-signal through differential transformers, behind A/D device transform sampling, handles sampled data to DSP again; DSP carries out the frequency domain differential demodulation amplitude that FFT (FFT) handled and calculated each corresponding frequency to the sampled data that receives, thereby realizes the calculating of longitudinal balance degree.
Based on the above-mentioned longitudinal balance degree theory of testing, and use above-mentioned testing hardware device, testing longitudinal balance degree of link has two kinds of schemes at present.
Existing scheme one: single-frequency point sends method one by one.Referring to shown in Figure 4, comprise following concrete steps:
The common mode amplitude of X11, transmission 1 single-frequency point is to differential line;
The data that signal on X12, the monitoring differential line and record monitor;
X13, calculate this single-frequency point frequency domain differential demodulation amplitude;
X14, calculate the longitudinal balance degree of this single-frequency point;
X15, judge whether all frequencies send,, then return step X11 if do not send; If send execution in step X16;
X16, drafting and reported result.
This technology is owing to adopt the mode of once only sending a frequency processing; The energy of tested frequency can be provided with bigger; Have higher signal to noise ratio, noise resisting ability is more intense, makes the longitudinal balance degree that tests out can accurately reflect the real balance situation of circuit basically.Referring to the longitudinal balance degree computing formula of above-mentioned actual track, this scheme can make common mode amplitude V
dEnough big, the differential mode amplitude is similar to the differential mode amplitude V ' that the circuit imbalance causes
c, promptly this moment V
nLess to the line balance influence.But because the method that adopts single-frequency point to send one by one, the entire process overlong time, can not fine satisfied test to " sensitivity " requirement of time.
Existing scheme two: all frequencies to be measured once send method.Referring to shown in Figure 5, comprise following concrete steps:
X21, all frequencies to be measured are generated the modulating wave common-mode signal;
X22, send to this modulation signal on the circuit;
The data that signal on X23, the monitoring differential line and record monitor;
X24, calculate each frequency frequency domain differential demodulation amplitude;
X25, calculate the longitudinal balance degree of each frequency;
X26, drafting and reported result.
This scheme has the fast advantage of computational speed; But consider the ability to cope with the exigency of hardware circuit; The energy sum of combinations of modulation ripple can not surpass the ability to cope with the exigency of hardware circuit, and each energy demand of sending frequency reduces at double, because measurement circuit noise etc. influence the existence of longitudinal balance degree factor; Make the signal to noise ratio of each frequency less; Each frequency signal anti-noise ability is relatively poor, causes noise etc. bigger to result's influence of longitudinal balance degree, makes test result can't reflect the real balance situation of circuit really.Referring to the longitudinal balance degree computing formula of above-mentioned actual track, this scheme can make common mode amplitude V
dEnough little, under the more satisfactory situation of line balance, the differential mode amplitude is similar to V
n, promptly this moment V
nLine balance is had the greatest impact.
Summary of the invention
The embodiment of the invention provides a kind of method and device of testing longitudinal balance degree of link, and in order to long problem of solution one testing time of prior art, and the logicalnot circuit unbalanced factor influences bigger problem to test result in the solution prior art two.
The inventive method comprises: the reliable common mode amplitude of confirming each frequency to be measured; According to test line characteristic and said reliable common mode amplitude each frequency is divided into groups; And be unit with the group, calculate the longitudinal balance degree of each frequency in each group respectively.
The device of testing longitudinal balance degree of link of the present invention comprises: the frequency generation module is used for frequency to be sent is merged the modulation signal that generates exciting signal source, and sends on the test line; The longitudinal balance degree computing module is used for according to the modulation signal on the test line, calculates the longitudinal balance degree of each corresponding frequency; Reliable amplitude determination module is used for confirming the reliable common mode amplitude of each frequency; Grouping module is used for according to the reliable common mode amplitude of test line characteristic and the output of reliable amplitude determination module each frequency being divided into groups, and is unit with the group, outputs to said frequency generation module one by one.
The no longer direct common mode amplitude with single-frequency point of the inventive method embodiment sends on the differential line one by one tests, and sends on the circuit also no longer with all frequencies generation modulating wave common-mode signals to be measured, and with this modulation signal and tests.
The inventive method embodiment has considered the noise jamming of actual track; And according to the noise differential mode amplitude of each frequency to be measured; Obtain the reliable common mode amplitude of each frequency to be measured, and then each frequency is divided into groups according to test line characteristic and said reliable common mode amplitude.Be unit at last with the group, calculate the longitudinal balance degree of each frequency in each group respectively.
Obviously with respect to prior art one, the inventive method is once sent a more than frequency to be measured, has reduced the transmission number of times, thereby has practiced thrift the testing time; And, also inherited the effect that prior art one can accurately reflect the real balance situation of circuit according to above-mentioned grouping strategy.
With respect to prior art two, the inventive method is once sent several but not every frequency to be measured.According to above-mentioned grouping strategy, make the energy of each frequency increase, but can satisfy line load, so can reach the effect of the real balance situation of accurate reflection circuit; And owing to adopt grouping strategy, so also inherited prior art two test speeds effect faster.
The embodiment of the invention also provides a kind of device of testing longitudinal balance degree of link.
Description of drawings
Fig. 1 is the professional schematic diagram of existing xDSL;
Fig. 2 is the circuit theory diagrams of existing differential mode amplitude, common mode amplitude;
Fig. 3 is the hardware configuration sketch map of existing test longitudinal balance degree;
Fig. 4 sends the flow chart of steps of method one by one for existing single-frequency point;
Fig. 5 once sends the flow chart of steps of method for existing all frequencies to be measured;
Fig. 6 is the hardware configuration sketch map of embodiment of the invention test longitudinal balance degree;
Fig. 7 is the inventive method embodiment flow chart of steps.
Embodiment
For when the longitudinal balance degree of measurement circuitry, can both guarantee test speed, guarantee test mass again, the embodiment of the invention provides a kind of device of testing longitudinal balance degree of link, is applied to adsl line, also can be applicable to other xDSL circuit.Referring to shown in Figure 6, it comprises: the reliable amplitude determination module, grouping module, frequency generation module and the longitudinal balance degree computing module that link to each other successively.
Said reliable amplitude determination module is used for calculating the noise differential mode amplitude of each frequency of test line, and confirms the reliable common mode amplitude of each frequency.
Said grouping module is used for according to the reliable common mode amplitude of test line characteristic and the output of reliable amplitude determination module each frequency being divided into groups, and is unit with the group, outputs to said frequency generation module one by one.
Said frequency generation module is used for frequency to be sent is merged the modulation signal that generates exciting signal source, and sends on the test line.
Said longitudinal balance degree computing module is used for according to the modulation signal on the test line, calculates the longitudinal balance degree of each corresponding frequency.
The function that said frequencies generation module and longitudinal balance degree computing module are had is identical with the function of existing longitudinal balance degree testing apparatus shown in Figure 3.
The embodiment of the invention provides a kind of method of testing longitudinal balance degree of link, and referring to shown in Figure 7, the method instance comprises following concrete steps:
S1, confirm the requirement of longitudinal balance degree test result, and confirm each frequency to be measured in the frequency range waiting to ask.
The longitudinal balance degree test result requires to be predefined for: noise power spectral density bigger (as-100dbm or-90dbm) time, the circuit longitudinal balance degree of testing after the noise effect is more than 60db.With noise power spectral density for-90dbm is an example.
For adsl line, frequency range to be asked is 0 to 2.2MHz, and other circuit is decided according to related protocol.
Generally speaking, need carry out longitudinal balance degree test, need comprise but be not limited to the longitudinal balance degree of each tone frequency each frequency of ADSL whole frequency.The frequency that promptly need measure longitudinal balance degree includes but not limited to the center frequency point of each tone.If only calculate the center frequency point of each tone, then need to measure, the frequency of longitudinal balance degree is f
i=(4312.5i) Hz ... (i=6,7,8 ... 511,512).
The noise differential mode amplitude of each frequency in S2, the calculating test line.
According to the noise power analysis of spectrum, be for the noise power spectral density PSD that with ADSL signal unit Tone is the random noise signal of unit bandwidth:
V wherein
kFor waiting that asking the pairing frequency domain energy of frequency, N is that Z is counted in FFT calculating
fBy being asked the impedance of frequency characteristic of correspondence on the transmission line, BW is the width of tone, f
sBe sample frequency.
M in the following formula is defined as:
Wherein: establish FFT points N=16K, Z
f=100 ohm, actual measurement noise power spectral density maximum-90dbm (given in step S1).
Be 10log (ρ
Tone)+30=-90; ρ then
Tone=10
-12
Being located at frequency f place noise differential mode amplitude is V
f, m=6, then:
And then can calculate: | V
f|=2.68*10
-4(V), promptly the differential mode amplitude that causes of noise is 2.68*10
-4(V).
S3, confirm the reliable common mode amplitude of each frequency to be measured.
According to designing requirement: order
(given in step S1), can know:
The amplitude V of frequency f
d=V
f* 10
3=2.68*10
-1(V)=268 (MV).
According to above-mentioned formula, calculate the amplitude of other frequency more respectively.
The influence that consideration of noise is measured the circuit longitudinal balance degree, if will make circuit noise under the situation of-90dbm, circuit has good longitudinal balance degree, the reliable common mode amplitude of then confirming should be less than the amplitude of arbitrary frequency.Suppose that reliable common mode amplitude is 300MV (in actual treatment, sends the needed reliable common mode amplitude of each frequency and not necessarily equate, that is to say that reliable common mode amplitude can satisfy the amplitude that is not less than arbitrary frequency but need only for a plurality of).
S4, each frequency is divided into groups.
The maximum voltage amplitude of supposing signal on the synchronization circuit of single plate hardware performance decision can not surpass 3V, and is that 300MV can know according to the reliable common mode amplitude that step S3 tries to achieve:
The maximum transmission of synchronization frequency number is 3V/300MV=10, and promptly every group of transmission frequency points is 10 at most in the present embodiment.Succinct for this instance, setting each frequency points of sending is 10 (also can unequally dividing into groups).
According to formula f
i=(4312.5i) Hz ... (i=6,7,8 ... 511,512) can know that frequency points to be measured is 512-6+1, in conjunction with 10 frequencies of each transmission of setting, then transmission group number is (512-6+1)/10=51 group.
S5, be unit, calculate the longitudinal balance degree of each frequency in each group respectively with the group.
Can know that through aforementioned calculation it is 300MV that frequency to be measured sends amplitude, every group is sent 10 frequencies, sends altogether 51 times.With respect to prior art one, send number of times and be kept to 51 times from 507 times, obviously practiced thrift the testing time; With respect to prior art two, the transmission amplitude of frequency to be measured is increased to 300MV, can satisfy test request.
Afterwards, according to order of packets, each frequency in a group to be measured is merged the modulation signal that generates exciting signal source, and send on the measurement circuit.For the every group of frequency that sends to circuit, DSP samples to the time-domain information on the circuit, and calculates the corresponding frequency domain differential demodulation amplitude of each frequency in this group through methods such as FFT, is designated as V
Cf
Can calculate in this group each frequency according to formula gets longitudinal balance degree and is:
After testing one group of frequency, judge whether to also have the group of not testing,, next group frequency is merged the modulation signal that generates exciting signal source, and send to completion test on the measurement circuit if having; Otherwise, report test result.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1. the method for a testing longitudinal balance degree of link is characterized in that, comprises the following steps:
With the common mode amplitude that is not less than arbitrary frequency amplitude reliable common mode amplitude as each frequency;
Maximum amplitude and said reliable common mode amplitude that test line can bear are divided by, obtain the quantity of every group of frequency,, calculate frequency group number, each frequency is divided into groups according to the quantity of frequency quantity to be measured and every group of frequency;
And be unit with the group, calculate the longitudinal balance degree of each frequency in each group respectively, comprising:
According to order of packets, each frequency in a group to be measured is merged the modulation signal that generates exciting signal source;
The modulation signal that obtains exciting signal source is sent on the measurement circuit;
Through to the signal sampling on the measurement circuit, and sampled data carried out fast fourier transform, obtain the corresponding frequency domain differential demodulation amplitude of each frequency in this group;
Calculate the longitudinal balance degree of each frequency in this group based on the frequency domain differential demodulation amplitude that each frequency is corresponding in this group;
Judge whether to also have the not group of test,,, each frequency in a group to be measured is merged the modulation signal that generates exciting signal source, and carry out subsequent step then according to order of packets if having; Otherwise, report test result.
2. the method for claim 1 is characterized in that, also to comprise before the reliable common mode amplitude of common mode amplitude that is not less than arbitrary described frequency amplitude as said each frequency:
-waiting to ask definite each frequency to be measured in the frequency range;
The noise differential mode amplitude of each frequency in the-calculating test line;
-confirm the requirement of longitudinal balance degree test result.
3. method as claimed in claim 2 is characterized in that, for adsl line, frequency range said to be asked is 0 to 2.2MHz.
4. method as claimed in claim 2 is characterized in that, said each frequency to be measured is confirmed through following formula:
f
i＝(4312.5i)Hz......(i＝6，7，8...511，512)。
5. method as claimed in claim 2 is characterized in that, obtains the noise differential mode amplitude of each frequency in the said test line according to the spectrum density of noise power.
6. like claim 1,2,4,5 each described methods, it is characterized in that said test line is DSL ADSL, VDSL circuit.
7. the device of a testing longitudinal balance degree of link comprises:
The frequency generation module is used for frequency to be sent is merged the modulation signal that generates exciting signal source, and sends on the test line;
The longitudinal balance degree computing module is used for according to the modulation signal on the test line, calculates the longitudinal balance degree of each corresponding frequency;
It is characterized in that said device also comprises:
Reliable amplitude determination module is used for the common mode amplitude that the is not less than arbitrary described frequency amplitude reliable common mode amplitude as said each frequency;
Grouping module is used for according to the reliable common mode amplitude of test line characteristic and the output of reliable amplitude determination module each frequency being divided into groups, and is unit with the group, outputs to said frequency generation module one by one.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007800004142A CN101322324B (en) | 2006-04-05 | 2007-01-18 | Method and apparatus for testing longitudinal balance degree of link |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100671919A CN100454939C (en) | 2006-04-05 | 2006-04-05 | Method and apparatus for testing vertical balance of line |
| CN200610067191.9 | 2006-04-05 | ||
| PCT/CN2007/000197 WO2007112631A1 (en) | 2006-04-05 | 2007-01-18 | Method and device for testing degree of line longitudinal balance |
| CN2007800004142A CN101322324B (en) | 2006-04-05 | 2007-01-18 | Method and apparatus for testing longitudinal balance degree of link |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101322324A CN101322324A (en) | 2008-12-10 |
| CN101322324B true CN101322324B (en) | 2012-08-29 |
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|---|---|---|---|
| CNB2006100671919A Expired - Fee Related CN100454939C (en) | 2006-04-05 | 2006-04-05 | Method and apparatus for testing vertical balance of line |
| CN2007800004142A Expired - Fee Related CN101322324B (en) | 2006-04-05 | 2007-01-18 | Method and apparatus for testing longitudinal balance degree of link |
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| CNB2006100671919A Expired - Fee Related CN100454939C (en) | 2006-04-05 | 2006-04-05 | Method and apparatus for testing vertical balance of line |
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|---|---|
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| WO (1) | WO2007112631A1 (en) |
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| EP2550752B1 (en) * | 2010-03-26 | 2018-11-21 | Telefonaktiebolaget LM Ericsson (publ) | Estimating pair symmetry status for a communication line |
| CN114355086B (en) * | 2022-01-05 | 2024-06-07 | 北京航空航天大学 | Antenna port intermodulation conduction sensitivity measurement method based on packet test |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1571521A (en) * | 2003-07-12 | 2005-01-26 | 华为技术有限公司 | A testing system of digital subscriber line and testing method |
| CN1588966A (en) * | 2004-09-27 | 2005-03-02 | 新太科技股份有限公司 | Method for detecting ADSC line parameter |
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| KR0143113B1 (en) * | 1995-08-18 | 1998-08-01 | 김광호 | Power sensing circuit in the repeated line |
| US6167259A (en) * | 1998-06-19 | 2000-12-26 | Ericsson Inc. | System and method of quantifying the degree of balance on forward link and reverse link channels |
| CN1257622C (en) * | 2002-01-24 | 2006-05-24 | 中兴通讯股份有限公司 | Method for detecting receive link of CDMA base station |
-
2006
- 2006-04-05 CN CNB2006100671919A patent/CN100454939C/en not_active Expired - Fee Related
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2007
- 2007-01-18 CN CN2007800004142A patent/CN101322324B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1571521A (en) * | 2003-07-12 | 2005-01-26 | 华为技术有限公司 | A testing system of digital subscriber line and testing method |
| CN1588966A (en) * | 2004-09-27 | 2005-03-02 | 新太科技股份有限公司 | Method for detecting ADSC line parameter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100454939C (en) | 2009-01-21 |
| CN1968309A (en) | 2007-05-23 |
| WO2007112631A1 (en) | 2007-10-11 |
| CN101322324A (en) | 2008-12-10 |
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