CN100492998C - Method for testing asymmetric digital user outgoing rate - Google Patents
Method for testing asymmetric digital user outgoing rate Download PDFInfo
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- CN100492998C CN100492998C CNB2005100276506A CN200510027650A CN100492998C CN 100492998 C CN100492998 C CN 100492998C CN B2005100276506 A CNB2005100276506 A CN B2005100276506A CN 200510027650 A CN200510027650 A CN 200510027650A CN 100492998 C CN100492998 C CN 100492998C
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- adsl
- digital subscriber
- telephone numbers
- subscriber line
- asymmetric digital
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Abstract
The invention comprises a management PC terminal for making overall analysis and process as well as its relevant software, an asymmetrical digital subscriber loop (ADSL) test apparatus and a digital subscriber line access multiplexer (DSLAM) at ADSL office side. The ADSL test apparatus is used to test the DSLAM at ADSL office side and to send the test parameters to the management PC terminal to make process and calculation.
Description
Technical field
The present invention relates to a kind of method of testing of asymmetric digital subscriber line line activation rate, can carry out test analysis to domestic asymmetric digital subscriber line (ADSL) circuit of promoting the use of at present, solve problems such as telecommunication bureau's relevant asymmetric digital subscriber line (ADSL) route selection and maintenance, belong to communication technical field.
Background technology
Along with asymmetric digital subscriber line (ADSL) power system capacity enlarges rapidly, traffic carrying capacity is sharply increased sharply, and in the installation of asymmetric digital subscriber line (ADSL) new equipment, existing equipment were safeguarded, the line test problem was outstanding day by day.Lead in the same strand of cable of user residence in telecommunication bureau, be configured asymmetric digital subscriber line (ADSL) business of some, continue to develop asymmetric digital subscriber line (ADSL) business? still lay new cable? become the urgent problem that solves of telecom operation.And for example, before opening asymmetric digital subscriber line (ADSL) business, how to select asymmetric digital subscriber line (ADSL) external cable circuit? can circuit be opened asymmetric digital subscriber line (ADSL) business? how many be transmission rates of circuit? which does the reason that influences transmission quality have? and after opening asymmetric digital subscriber line (ADSL) business, in asymmetric digital subscriber line (ADSL) circuit regular maintenance, problems such as the line fault of appearance, transmission quality decline, fluctuation of service need in time deal with.
Same burst of cable outlet rate of asymmetric digital subscriber line (ADSL) is a focus of paying close attention to aspect operation maintenance and circuit assessment in the industry always.
Crosstalking of asymmetric digital subscriber line (ADSL) cable is to influence one of main factor that asymmetric digital subscriber line (ADSL) takes up rate.
As shown in Figure 1, be near-end cross and far-end cross talk schematic diagram, the interchannel of Ge Liing is crosstalked owing to the electromagnetic coupled effect will produce directly physically.Near-end cross NEXT interference source line is gone up to adjacent disturbed line through NEXT coupling channel couples the macro-energy signal that is sent to received signal, and the NEXT crosstalk energy direction of propagation is opposite with interference source transmission signal propagation direction.And the far-end FEXT crosstalk energy direction of propagation is identical with interference source transmission signal propagation direction, and the right received signal of crosstalk signal and disturbed line has all been passed through the decay of channel.
Right title Digital Subscriber Line (ADSL), NEXT is the main noise source.
NEXT：
To a plurality of interference source situations, its mode is:
|H
NEXT(f)|
2＝2.7925×10
-9*f(kHz)
3/2＝8.8306×10
-14*f(Hz)
3/2
When the interference source number is n, n≤49 o'clock, the χ value is χ=χ
n=χ
49* n
0.6/ 10, χ
49Be the constant coefficient in the following formula.
FEXT：
FEXT under many interference sources square transfer function is
|H
FEXT(d，f)|
2＝ψf
2d|H(d，f)|
2＝ψf
2de
-2α(f)d
D is a cable length in the formula, and α (f) is the real part (following formula) of Channel Transmission constant, and (d f) is channel transfer function (following formula) to H, and ψ is a stochastic variable.
More than be under simplified condition, to the analysis of NEXT, FEXT coupling channel.In the reality, the right combinations of services situation of all twisted-pair feeders is relevant in the concrete property of NEXT, FEXT noise and the PIC cable.
Remove outside the direct coupling crosstalk noise, also having with third party is the indirect coupling crosstalk noise of intermediary, also can produce certain influence to systematic function.
In with a branch of cable, NEXT and FEXT noise that other ADSL system in ISDN system, HDSL system, T1/E1 system and the same bunch of cables produces have been formed ADSL system interference source
According to U.S. mark T1E1.413, Europe superscript ETSI G.996.1, the various power of crosstalking of asymmetric digital subscriber line (ADSL) circuit are as shown in table 1, should at first analyze the situation of crosstalk noise when beginning.
The table 1 adsl line power of crosstalking
Summary of the invention
The objective of the invention is to realize a kind of method of testing that can rapidly, accurately test out asymmetric digital subscriber line (ADSL) line activation rate.This method is conceived to application practice, aims to provide the actual effective ways of opening operation to operator.Because the circuit of different region operator differs greatly, this method can provide the personalizing parameters of this region according to the variation of difference, provides method in common thereby can open for the broadband of this region.
For realizing above purpose, technical scheme of the present invention provides the method for testing of asymmetric digital subscriber line line activation rate, it is characterized in that, carries out test and the speed limit test that takes up rate that takes up rate of Circuit Quality Test, full rate, and its method is:
1. at first carrying out circuit chooses: choose the relatively more typical circuit in locality, if because line quality differs greatly, choose quality each one group in circuit and relatively poor circuit preferably respectively, to be connected the test that takes up rate of base unit that twisted-pair feeder forms with asymmetric digital subscriber line (ADSL) broadband local side DSLAM digital subscriber line by 20-30 right title Digital Subscriber Line (ADSL) integral test systems;
2. then to the base unit of forming by the 25 pairs of twisted-pair feeders Circuit Quality Test that takes up rate:
(1) on the twisted-pair feeder institute respective user port/descending maximum feasible speed, on/descending present rate, on/descending noise redundancy, on/four physical layer transmission performance parameters of downstream attenuation inquire about, the right quantity of isdn user's line in the record cable;
(2) data query of statistical test quadrinomial parameter is found out/functional relation of descending maximum feasible speed and other three parameters and asymmetric digital subscriber line (ADSL), isdn user's demand pairs;
(3) analyze the mutual influence of above-mentioned parameters, utilize the functional relation of having set up to calculate maximum feasible rate variation trend;
(4) foundation is with the functional relation of right distribute telephone numbers percentage and maximum feasible speed of asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable;
(5) set up the functional relation that speed is set with asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable right distribute telephone numbers percentage and present rate, port;
(6) utilize the functional relation of the percentage=F that distributes telephone numbers (present rate, speed is set) to calculate this, estimate actual asymmetric digital subscriber line (ADSL) subscribers feeder the maximum quantity of can distributing telephone numbers with the right percentage specific volume surplus of distributing telephone numbers of asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable;
(7) calculate with on right average of each asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable/whether descending noise redundancy less than port is provided with speed, minimum expectation noise redundancy value when distributing telephone numbers percentage specific volume surplus satisfying;
(8) if on average/descending noise redundancy is not less than satisfying that port is provided with speed, minimum expectation noise redundancy value when distributing telephone numbers percentage specific volume surplus, then calculate with on right average of each asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable/descending present rate whether less than satisfy that port is provided with speed, on minimum when distributing telephone numbers percentage specific volume surplus/descending present rate desired value;
(9), then calculate with right actual of current asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable and distribute telephone numbers quantity whether less than setting under the port speed maximum quantity of can distributing telephone numbers if not slight port is provided with speed in satisfying, on minimum when distributing telephone numbers percentage specific volume surplus/descending present rate desired value;
(10) if, illustrate with the right actual quantity of distributing telephone numbers of current asymmetric digital subscriber line (ADSL) subscribers feeder in the thigh cable too much less than setting under the port speed maximum quantity of can distributing telephone numbers;
(11) if be not less than and setting under the port speed maximum quantity of can distributing telephone numbers, preserve and output line to a crosstalk analysis result.
The principal element that influences asymmetric digital subscriber line (ADSL) line activation rate has:
1. circuit hardware factor: as line length, decay, loading, line footpath, bridge joint etc., save according to second before professional and described these factors are got rid of opening asymmetric digital subscriber line (ADSL), can effectively improve the circuit transmission performance, promote the route selection rate.
2. logicalnot circuit factor: this mainly is the line speed collocation method.To the place that part circuit situation can't be changed, adopt the different strategies of opening, can effectively improve the route selection rate.For example, to circuit ambient noise rugged environment, improve the transmission signal to noise ratio thereby reduce transmission rate.Can improve the route selection rate by reducing transfer rate; The circuit abominable to part, it is very high to crosstalking of All other routes generation,
3. the abominable circuit of part, it is very high to crosstalking of producing of All other routes, gets rid of these circuits and can effectively reduce and crosstalk, thereby improve taking up rate of whole cable.
4.T1/E1 special line: traditional T1/E1 special line adopts the ami line coding, owing to occur early, do not adopt advanced DSL technology, but realize the 2M transmission by strengthening through-put power, therefore it is very high to crosstalking of DSL business, and the ANSI prediction compares the professional high 15.5dB that crosstalks (ANSI T1.413-1995 Annex B.3) that produces of common asymmetric digital subscriber line (ADSL).Therefore T1/E1 must transmit in different cables with asymmetric digital subscriber line (ADSL) is professional, otherwise right title Digital Subscriber Line (ADSL) takes up rate very low.
5. the circuit model of cable wire logarithm: ITU and ansi standard all is to adopt 25 lines to analyzing with 50 existing right cable models, draw cable noise, cross-talk models, thereby make standard, if the right quantity of cable center line is greater than 50 pairs, then corresponding ambient noise and crosstalking all will increase.According to calculation of crosstalk formula (ANSI T1.413-1995 Annex B.1), under the same case, what the 100 pairs of twisted-pair feeders produced crosstalks than 50 couples of about 1.8dB of twisted-pair feeder.Therefore line pair count is big more in the cable, and it is just low more to take up rate accordingly.
The present invention adopts the method for testing of asymmetric digital subscriber line (ADSL) line activation rate and system can effectively overcome the principal element that influences asymmetric digital subscriber line (ADSL) line activation rate, can rapidly, accurately test out asymmetric digital subscriber line (ADSL) line activation rate.
Advantage of the present invention is rapidly, accurately to test out asymmetric digital subscriber line (ADSL) line activation rate.
Description of drawings
NEXT and FEXT schematic diagram in Fig. 1 PIC cable between the different user loop;
Fig. 2 test system structure schematic diagram;
Fig. 3 asymmetric digital subscriber line (ADSL) integral test system structural representation;
Same strand of cable center line of Fig. 4 is to a flow chart of crosstalk analysis system;
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 2, be the test system structure schematic diagram, the test macro of asymmetric digital subscriber line (ADSL) line activation rate, it is characterized in that, by comprehensive analysis processing office terminal PC computer and software thereof, at least one asymmetric digital subscriber line (ADSL) integral test system and at least one ADSL broadband local side DSLAM digital subscriber line are formed, comprehensive analysis processing office terminal PC computer connects asymmetric digital subscriber line (ADSL) integral test system and ADSL broadband local side DSLAM equipment simultaneously, and every asymmetric digital subscriber line (ADSL) integral test system is connected with an ADSL broadband local side DSLAM digital subscriber line.Broadband local side DSLAM digital subscriber line and ADSL integral test system are delivered to comprehensive analysis processing office terminal PC Computer Processing with the parameter of test simultaneously and are calculated.
As shown in Figure 3, be asymmetric digital subscriber line (ADSL) integral test system structural representation, described asymmetric digital subscriber line (ADSL) integral test system had been applied for patent, the applying date is in June, 2003, the patent No. is ZL03232612.2, this equipment is by operational administrative terminal 1, controller module 2,12 parameters and ADSLMODEM. energising identification test module 3, the user terminal 4 of user side, subscriber's line 5, the outside line right by survey line inserts 6, by survey line to 7, inserted 8 by the interior lines that survey line is right, local side DSLA equipment 9, ATU-C and ATU-R physical layer performance simulation test module 10, ping testing module 11 is formed operational administrative terminal 1 and is connected with controller module 2, controller module 2 is discerned test module 3 with 12 parameters and ADSLMODEM. energising respectively, ATU-C is connected with ping testing module 11 with ATU-R physical layer performance simulation test module 10, ping testing module 11 connects being cut 7 by survey line from the local side subscriber line ports, by to 8 tests of interior lines side and 6 tests of outside line side, realize three part usability testings, wherein, outside line 6 connects user terminal 4 through subscriber's line 5, and interior lines 8 connect local side DSLAM Digital Subscriber Line access and multiplexing device 9.
As shown in Figure 4, for strand cable center line is to a flow chart of crosstalk analysis system together, the method for testing of asymmetric digital subscriber line (ADSL) line activation rate is characterized in that, carry out test and the speed limit test that takes up rate that takes up rate of Circuit Quality Test, full rate, its method is:
1. at first carrying out circuit chooses:
Choose the relatively more typical circuit in locality, if because line quality differs greatly, can choose quality each one group in circuit and relatively poor circuit preferably respectively, for the ease of comparing, according to the definition of " copper core polyolefin insulating plastic-aluminum composite sheath city communication cable " YD/T 322-1996, to the base unit of forming by the 25 pairs of twisted-pair feeders test that takes up rate;
2. then to the base unit of forming by the 25 pairs of twisted-pair feeders Circuit Quality Test that takes up rate
(1) to on each line institute respective user port in strand cable/descending maximum feasible speed, on/descending present rate, on/descending noise redundancy, on/four physical layer transmission performance parameters of downstream attenuation inquire about the right quantity of isdn user's line in the record cable;
(2) data query of statistical test quadrinomial parameter, find out/functional relation of descending maximum feasible speed and other three parameters and asymmetric digital subscriber line (ADSL), isdn user's demand pairs: maximum feasible speed=F, it is noise redundancy, decay, present rate, asymmetric digital subscriber line (ADSL) demand pairs, the isdn line logarithm;
(3) analyze the mutual influence of above-mentioned parameters, utilize the functional relation of having set up to calculate maximum feasible rate variation trend;
(4) foundation is with the functional relation of right distribute telephone numbers percentage and maximum feasible speed of asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable: the percentage=F that distributes telephone numbers (maximum feasible speed);
(5) set up the functional relation that speed is set with asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable right distribute telephone numbers percentage and present rate, port: the percentage=F that distributes telephone numbers (present rate, speed is set);
(6) utilize the functional relation of the percentage=F that distributes telephone numbers (present rate, speed is set) to calculate this, estimate actual asymmetric digital subscriber line (ADSL) subscribers feeder the maximum quantity of can distributing telephone numbers with the right percentage specific volume surplus of distributing telephone numbers of asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable;
(7) satisfy that port is provided with speed, under the situation when distributing telephone numbers percentage specific volume surplus, calculate with on right average of each asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable/whether descending noise redundancy less than minimum expectation noise redundancy value; If on average/descending noise redundancy less than satisfy that port is provided with speed, minimum expectation noise redundancy value explanation when distributing telephone numbers percentage specific volume surplus with strand each line of cable to the circuit that causes because of crosstalking on/downstream attenuation is excessive;
(8) if on average/descending noise redundancy is not less than satisfying that port is provided with speed, minimum expectation noise redundancy value when distributing telephone numbers percentage specific volume surplus, then calculate with on right average of each asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable/descending present rate whether less than satisfy that port is provided with speed, on minimum when distributing telephone numbers percentage specific volume surplus/descending present rate desired value;
If on average/descending present rate less than satisfy that port is provided with speed, on minimum when distributing telephone numbers percentage specific volume surplus/descending present rate desired value, illustrate with strand each line of cable to make because of crosstalking/descending present rate decline is too low;
(10), then calculate with right actual of current asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable and distribute telephone numbers quantity whether less than setting under the port speed maximum quantity of can distributing telephone numbers if not slight port is provided with speed in satisfying, on minimum when distributing telephone numbers percentage specific volume surplus/descending present rate desired value;
(11) if, illustrate with the right actual quantity of distributing telephone numbers of current asymmetric digital subscriber line (ADSL) subscribers feeder in the thigh cable too much less than setting under the port speed maximum quantity of can distributing telephone numbers;
(12) if be not less than set under the port speed that maximum can distribute telephone numbers that quantity is preserved and output line to a crosstalk analysis result.
Below be certain DSLAM test performance index and beginning performance index:
Table 2 utilizes DLS400 circuit emulation instrument test performance index:
In beginning is used because be subjected to crosstalking between line quality, line, the influence of factor such as impulsive noise, actual open with stable operation speed will be far below last table.Following table is to the summary of various places beginning performance index (noise immunity 6dB), it should be noted that the performance index of different regions beginning differ greatly.
Table 3 adsl equipment beginning performance index:
| Distance (Km) | Maximum downstream rate (Kbps) | Maximum upstream rate (Kbps) | Average downstream rate (kbps) | Average upstream rate (kbps) |
| 0 | 8128 | 896 | 8128 | 896 |
| 0.5 | 8128 | 896 | 8128 | 896 |
| 1.0 | 8128 | 800 | 6032 | 800 |
| 1.5 | 8128 | 800 | 4096 | 800 |
| 2.0 | 8128 | 800 | 3360 | 640 |
| 2.5 | 8128 | 800 | 2528 | 576 |
| 3.0 | 6032 | 640 | 1024 | 512 |
| 3.5 | 4096 | 512 | 800 | 480 |
| 4.0 | 1920 | 128 | 512 | 352 |
| 4.5 | 1024 | 128 | 352 | 128 |
| 5.0 | 512 | 64 | 192 | 64 |
Maximum downstream and upstream rate are that average descending and upstream rate is the result who combines various places beginning to the quality data that record of circuit preferably in the last table, and common circuit meets above situation.
Claims (1)
1. the method for testing of asymmetric digital subscriber line line activation rate is characterized in that, carries out test and the speed limit test that takes up rate that takes up rate of Circuit Quality Test, full rate, and its method is:
1.1 at first carrying out circuit chooses: choose the relatively more typical circuit in locality, if because line quality differs greatly, choose quality each one group in circuit and relatively poor circuit preferably respectively, to the base unit of forming by 20-30 right title Digital Subscriber Line (ADSL) test that takes up rate;
1.2 then to the base unit of forming with each line in strand cable by the 25 pairs Circuit Quality Test that takes up rate: (1) to on each line institute respective user port in strand cable/descending maximum feasible speed, on/descending present rate, on/descending noise redundancy, on/four physical layer transmission performance parameters of downstream attenuation inquire about, and write down the right quantity of isdn user's line in the cable;
(2) data query of statistical test quadrinomial parameter is found out/functional relation of descending maximum feasible speed and other three parameters and asymmetric digital subscriber line (ADSL), isdn user's demand pairs;
(3) analyze the mutual influence of above-mentioned parameters, utilize the functional relation of having set up to calculate maximum feasible rate variation trend;
(4) foundation is with the functional relation of right distribute telephone numbers percentage and maximum feasible speed of asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable;
(5) set up the functional relation that speed is set with asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable right distribute telephone numbers percentage and present rate, port;
(6) utilize the functional relation of the percentage=F that distributes telephone numbers (present rate, speed is set) to calculate this, estimate actual asymmetric digital subscriber line (ADSL) subscribers feeder the maximum quantity of can distributing telephone numbers with the right percentage specific volume surplus of distributing telephone numbers of asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable;
(7) calculate with on right average of each asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable/whether descending noise redundancy less than port is provided with speed, minimum expectation noise redundancy value when distributing telephone numbers percentage specific volume surplus satisfying;
(8) if on average/descending noise redundancy is not less than satisfying that port is provided with speed, minimum expectation noise redundancy value when distributing telephone numbers percentage specific volume surplus, then calculate with on right average of each asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable/descending present rate whether less than satisfy that port is provided with speed, on minimum when distributing telephone numbers percentage specific volume surplus/descending present rate desired value;
(9) if be not less than satisfy that port is provided with speed, on minimum when distributing telephone numbers percentage specific volume surplus/descending present rate desired value, then calculate with right actual of current asymmetric digital subscriber line (ADSL) subscribers feeder in strand cable and distribute telephone numbers quantity whether less than setting under the port speed maximum quantity of can distributing telephone numbers;
(10) if, illustrate with the right actual quantity of distributing telephone numbers of current asymmetric digital subscriber line (ADSL) subscribers feeder in the thigh cable too much less than setting under the port speed maximum quantity of can distributing telephone numbers;
(11) if be not less than and setting under the port speed maximum quantity of can distributing telephone numbers, preserve and output line to a crosstalk analysis result.
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| CNB2005100276506A CN100492998C (en) | 2005-07-11 | 2005-07-11 | Method for testing asymmetric digital user outgoing rate |
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| CN100492998C true CN100492998C (en) | 2009-05-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101072047B (en) * | 2007-06-11 | 2010-07-28 | 江苏省电信有限公司南京分公司 | DSLAN port fast detecting device |
| CN101232306B (en) * | 2008-02-19 | 2012-09-19 | 中兴通讯股份有限公司 | Crosstalk test approach of second generation ultra-high speed numeral user loop switch-in user |
| EP2628087B1 (en) * | 2010-10-15 | 2015-04-22 | ST-Ericsson SA | Methods and systems for testing electrical behavior of an interconnect having asymmetrical links |
| WO2012171167A1 (en) * | 2011-06-13 | 2012-12-20 | 华为技术有限公司 | Service quality monitoring device, working method and system thereof |
| CN103051495B (en) * | 2012-12-19 | 2015-06-17 | 瑞斯康达科技发展股份有限公司 | Method and system for determining carrying capacity of network service |
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Non-Patent Citations (2)
| Title |
|---|
| 中兴DSLAM在线测试实例简介. 闫强，张晰.邮电设计技术，第3期. 2003 |
| 中兴DSLAM在线测试实例简介. 闫强，张晰.邮电设计技术，第3期. 2003 * |
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