CN101487872B - Network cable test method and device - Google Patents
Network cable test method and device Download PDFInfo
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- CN101487872B CN101487872B CN2009101180528A CN200910118052A CN101487872B CN 101487872 B CN101487872 B CN 101487872B CN 2009101180528 A CN2009101180528 A CN 2009101180528A CN 200910118052 A CN200910118052 A CN 200910118052A CN 101487872 B CN101487872 B CN 101487872B
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Abstract
The invention provides a network cable test method and a corresponding test device. The test method used for judging the twisting standard of twisted-pair cables is not based on that the intensity of a response signal must reach a certain fixed specific value of the intensity of an input signal, namely a certain absolute voltage value, but adopts comparison of relative intensity of response signals to judge whether the cables are twisted, so the method is a relative comparison method. Compared with the prior cable test method (absolute comparison method), the relative comparison method can judge the cable pair twisting condition in the twisted-pair cables more accurately and effectively, and also has wide application range. In addition, the direct current voltage excited by square wave in the method has a stable value after the response signal is subjected to AC/DC conversion; and compared with step signal excitation, and exponential descending sampling and maintenance, the sampling stability is much higher. The method for judging the twisted-pair cables is simple and reliable, has high accuracy, can effectively improve accuracy of judgment, and reduces error for judging the twisted-pair cables with short length. Simultaneously, the method also increases test for frogging cables, and the whole test device has more perfect function.
Description
Affiliated technical field
The present invention relates to a kind of method and corresponding device thereof of test network cable.
Background technology
The cable that is used to connect computer network is generally category-5 cable, six class lines, seven class lines etc., i.e. T568A/B line.The inside of these cables is essentially 4 pairs of twisted-pair feeders; The outside that has has screen layer, and what have does not have.The two ends of cable is connecting the RJ45 joint.Usually, the 1-2 of RJ45 joint, 3-6,4-5,7-8 terminal are connecting a pair of twisted-pair feeder respectively, and two endings of cable have two kinds: one, direct-through line: the two ends connection is the same, and (as the T568A/B cable) sees Fig. 9; Two, cross spider: two endings are different, and wherein 1 of an end, 2 terminals are received 3,6 terminals of the other end; 3,6 terminals are then received 1,2 terminals of the other end, intercourse, and see Figure 10.
The network cable common faults has short circuit, opens circuit misconnection, reversal connection (opposite in the order of connection of two ends with a pair of line).In addition, the fault of a kind of in addition " line is to separating " (sprit pair), " line is to separating " refers to has two pairs of lines (to exchange) line of line centering separately mutually at the connection terminal while at two ends wrong in the twisted-pair cable, as shown in Figure 8." line to separate " this fault can cause that network transmission performance descends, the circuit problems such as increase of crosstalking., having the direct current characteristic of the cable of this fault is the same with normal cable, can't find with general means test, often thinks normal.It is a key factor that causes circuit hidden danger, influences communication quality.
At present, whether most of network cable measuring instruments of Xiao Shouing exist the fault of short circuit, open circuit, reversal connection in can the decision network cable on the market, and whether screen layer have the fault of short circuit, broken string, but can't judge the fault of " line is to separating ".
The method of a kind of judgement that United States Patent (USP) discloses for No. 6002247 " line is to separating " (that is: whether twisted-pair feeder is to twisting mutually) is as follows:
A. select pair of terminal to test earlier;
B. whole ground connection of all the other terminals.
C. step voltage pumping signal of input on the terminal in selected pair of terminal is observed response signal on another terminal.
D. the intensity of response signal and input signal relatively judges whether two selected lines twist around together, or with other line twist around.
E. the standard of Pan Dinging is: the intensity of response signal must reach 5% or 10% of input signal intensity.
F. repeatedly each terminal of cable is presumed to line to testing.
There is following defective in this method:
What one, adopt when judging " line is to separating " is the step voltage signal excitation, and load is the RC differentiating circuit, its response signal voltage intensity Vo=e
-(t/RC)Response signal graph is exponential decay, and (referring to Fig. 4) wherein C is tested excitation line and the distributed capacitance between the line of response; Under general situation, the distributed capacitance between Jiao two lines is than the distributed capacitance much bigger (being approximately about 1.5～2 times) between two lines that do not twist mutually mutually; Utilize this characteristics, can distinguish twisting mutually with the relation of not twisting mutually between the line.But in fact, distributed capacitance C is a function that becomes with cable length.The twisted-pair feeder distributed capacitance of different length differs greatly, and the intensity of their caused response signals differs greatly.In this case, if all use the intensity level (5%--10% of input signal strength) of same response signal to judge the erroneous judgement that is easy to cause.Such as: length is that its distributed capacitance of twisted-pair feeder that 100 meters twisted-pair feeder and length are 2 meters differs 50 times, and its response signal voltage also will differ tens of times.Suppose that its input response signal of 100 meters long twisted-pair feeders is 36% of an input signal strength, then 2 meters its response signals of long twisted-pair feeder have just almost leveled off to zero.Therefore, if judge according to the intensity criterion (greater than the 5%--10% of input signal strength) of given response signal misjudgment will appear.This problem more in short-term, just seems outstanding especially in the length of tested twisted-pair feeder.
Two, the sampling holding signal is an instantaneous value, and sampling error is bigger.
Three, comprise in the decision method selected terminal all is arranged to ground connection to (line to) outer all the other terminals; And constantly repeatedly each terminal of cable is presumed to line to step such as testing.The judgement time is long, and test speed is slow.
Four, it can only test direct-through line, can not test cross spider.
Summary of the invention
The present invention is directed to the defective that existing network wireline test method exists, propose a kind of network cable test method and corresponding testing device.It judges that the right method of twisted-pair cable is simple, and reliable, the accuracy height can effectively improve the accuracy of judgement, reduces the decision error of length than short twisted-pair cable.It both can measure " direct-through line ", also can be used for measuring " cross spider ".
The technical solution adopted for the present invention to solve the technical problems is:
A kind of network cable test method has short circuit, opens circuit, and misconnection, reversal connection and " line is to separating " decision-making function is characterized in that: when judging " line is to separating ":
A. at first select in the cable a line as the input (response) line;
B. remaining line is as the excitation line;
C. after input (response) signal converts direct current signal to through the AC/DC converter, convert digital quantity to by A/D converter and be stored on the register;
D. successively the square wave excitation signal is added in turn on remaining each bar excitation line, and their response is stored on the relevant register;
The size of response when each the bar line that e. compares encourages; Wherein response is maximum and just be judged to be and import the twisted-pair feeder that (response) line twists mutually greater than second largest 1.5 times of pairing excitation lines of numerical value of response;
Be enough to condition if f. all responses are all discontented, then do not exist the line that twists mutually right;
G. according to 1,3,4,7 order respectively with the line of RJ45 port respective terminal as incoming line, and judge with it the terminal of strand mutually;
During the test direct-through line, selector switch S3 connects electronegative potential; During the test cross spider, selector switch S3 connects noble potential, and MCU is according to the variation of gating switch current potential, and 1. the terminal that will connect main frame by internal processes exchanges with definition 3., 2. with 6..
A kind of network cable proving installation is made of main frame and distal component 10 two parts; It is characterized in that: main frame is electrically connected in proper order by square wave signal generator 1, multi-way switch 2, AC/DC converter 3, A/D converter 4, register 5, comparer 6, display 11, selector switch 7, RJ45 socket; Distal component 10 is made up of diode, resistance and RJ45 interface; Be connected tested cable between main frame and the distal component;
Square wave signal generator 1, multi-way switch 2, AC/DC converter 3, A/D converter 4, register 5, comparer 6 all are made of same MCU;
When judging " line is to separating ", a line in the tested cable of multi-way switch elder generation selection is as input (response) line, remaining line is as the excitation line, successively the square wave excitation signal is added in turn on remaining each bar line by MCU control, input (line of response) is connected to pull-up resistor 8 and AD/DC converter 3, A/D converter 4, register 5, comparer 6; Write down respectively and the size of response during each bar line excitation relatively, wherein response is maximum and surpass the twisted-pair feeder that the excitation line is exactly and input (response) line twists mutually of 1.5 times of second largest numerical value;
With the RJ45 port according to 1,3,4,7 order respectively with the line of respective terminal as incoming line, and judge with it the terminal of strand mutually;
During the test direct-through line, selector switch 7 is connected noble potential; During the test cross spider, the selector switch earthing potential.
The invention has the beneficial effects as follows:
The present invention is used to judge that the standard whether twisted-pair cable twists mutually is not the some fixing ratio that must reach input signal strength according to the intensity of response signal, i.e. certain absolute magnitude of voltage; But adopting the relative size that compares response signal to judge whether mutually strand of cable, this is a kind of relatively method.This relatively method can judge more accurate, more effectively that compared with original wireline test method (absolute relative method) line in the twisted-pair cable is to the situation of strand mutually.Also has the wideer scope of application.It can accomplish 0.3 meter to length than effective judgement scope of short network cable.In addition, the square wave excitation that this method adopts is a stable response through the DC voltage after the AC/DC conversion; The method that the response curve of exponential form decline is sampled, kept is compared with the step signal excitation with the sort of, sample effect stability of the present invention is much higher.This method has also increased the test to cross cable simultaneously, and the cable kind that whole testing device can be tested is more perfect.
Description of drawings
The present invention is further described (with reference to appended drawing) below in conjunction with drawings and Examples.
Fig. 1 is a theory diagram of the present invention
Fig. 2 judges the circuit theory diagrams of twisted-pair feeder to whether twisting mutually
The schematic diagram of No. 6002247 wireline test methods of Fig. 3 United States Patent (USP)
The oscillogram of No. 6002247 wireline test methods of Fig. 4 United States Patent (USP).
When Fig. 5 is encouraged by step voltage, the response curve that cable length is different.
Fig. 6 the present invention tests the response curve of the twisted-pair cable of different length.
Fig. 7 terminator cap
The twisted-pair cable of Fig. 8 " line is to separating ".
Fig. 9 direct-through line
Figure 10 cross spider
Embodiment
Among Fig. 1: square-wave generator 1, multi-way switch 2, AC/DC converter 3, A/D converter 4, register 5, comparer 6, selector switch 7, pull-up resistor 8, tested cable 9, terminator cap 10.
Wherein: square-wave generator 1, multi-way switch 2, A/D converter 4, register 5, comparer 6 all are made of same MCU, and MCU adopts PIC16C712; S1, S2 are 2 multi-channel gating switch, can constitute with the I/O mouth of MCU; Carrying out twisted-pair feeder twists when judging mutually, make MCU produce the square wave excitation signal of 1KHz by programmed control, output to the terminal that is energized by multi-channel gating switch S1, because the existence of distributed capacitance between line, multi-channel gating switch S2 can receive an input (response) signal by the terminal that connects; This response signal converts direct current signal to by AC/DC converter 3, is deposited with on the register 5 of MCU inside after converting digital signal to by A/D converter 4 again.
Test is when " line is to separating ", and multi-way switch S2 at first selects a terminal (line) as input (response) line; S1 successively then remaining each terminal of gating and the square wave excitation signal of 1KHz injected as the excitation line; A terminal AC/DC of the every gating of S1 converter just produces a direct current signal, is converted to by A/D converter to be deposited with after the digital form on the inner relevant register of the MCU unit; The size that compares the response signal of being deposited on each register cell; Wherein response signal value is maximum and obviously greater than pairing that excitation line of second largest numerical value, and the twisted-pair feeder that twists mutually together with the selected line of response of S2 is right exactly.Wherein obviously greater than definition can select greater than more than 1.5 times, if all responses of testing result all do not satisfy this condition, then decidable: do not exist the twisted-pair feeder of strand mutually right.Change multi-way switch S2 and insert end points, according to 1,3,4,7 order respectively with the line of respective terminal on the RJ45 joint as incoming line, and by multi-way switch S2 with remaining each terminal as the excitation line, determine with it the terminal of strand mutually according to the method described above respectively.
During the test direct-through line, selector switch S3 connects electronegative potential; During the test cross spider, selector switch S3 connects noble potential, and MCU is according to the variation of gating switch current potential, and 1. the terminal that will connect main frame by internal processes exchanges with definition 3., 2. with 6., just can judge correctly that the twisted-pair feeder of strand is right mutually.
Pull-up resistor 8 is loads of line of response, and its value can be at 5K-50K, and AC/DC converter 3 can adopt the active rectifier that has operational amplifier; Display 11 is used for showing testing result, can adopt LED also can adopt LCD.
Far-end adaptation 10 the different terminal of numbering between used different resistance values, can allow MCU identify corresponding terminal at an easy rate.
Claims (6)
1. a network cable test method has " line is to separating " decision-making function, it is characterized in that: when judging " line is to separating ":
A. at first select in the cable a line as the input line of response;
B. remaining line is as the excitation line;
C. after importing response signal and converting direct current signal to, convert digital quantity to by A/D converter and be stored on the register through the AC/DC converter;
D. successively the square wave excitation signal is added in turn on remaining each bar excitation line, and their response is stored on the relevant register;
The size of response when e. relatively each bar line encourages; Wherein response is maximum and just be judged to be and import the twisted-pair feeder that line of response is twisted mutually greater than second largest 1.5 times of pairing excitation lines of numerical value of response;
Be enough to condition if f. all responses are all discontented, then do not exist the line that twists mutually right;
G. according to 1,3,4,7 order respectively with the line of RJ45 joint respective terminal as the input line of response, and judge with it the terminal of strand mutually.
2. network cable test method according to claim 1, it is characterized in that: during the test direct-through line, selector switch S3 connects electronegative potential; During the test cross spider, selector switch S3 connects noble potential, and MCU is according to the variation of selector switch S3 current potential, and 1. the terminal that will connect main frame by internal processes exchanges with definition 3., 2. with 6..
3. a network cable proving installation is made of main frame and distal component (10) two parts; It is characterized in that: main frame is electrically connected by square wave signal generator (1), multi-way switch (2), AC/DC converter (3), A/D converter (4), register (5), comparer (6), display (11) order, main frame also comprises selector switch (7) and RJ45 socket, and wherein the RJ45 socket is electrically connected with multi-way switch (2); Distal component (10) is made up of diode, resistance and RJ45 interface; Be connected tested cable between main frame and the distal component.
4. the described network cable proving installation of claim 3, it is characterized in that: square wave signal generator (1), multi-way switch (2), A/D converter (4), register (5), comparer (6) all are made of same MCU.
5. the described network cable proving installation of claim 3, it is characterized in that: when judging " line is to separating ", a line in the tested cable of multi-way switch elder generation selection is as the input line of response, remaining line is as the excitation line, successively the square wave excitation signal is added in turn on remaining each bar line by MCU control, the input line of response is connected to pull-up resistor (8) and AC/DC converter (3), and AC/DC converter (3), A/D converter (4), register (5), comparer (6) are linked in sequence; Write down respectively and the size of response during each bar line excitation relatively, wherein maximum the and excitation line that surpass 1.5 times of second largest numerical value of response is exactly and imports the twisted-pair feeder that line of response is twisted mutually; With the RJ45 port according to 1,3,4,7 order respectively with the line of respective terminal as the input line of response, and judge with it the terminal of strand mutually.
6. the described network cable proving installation of claim 3 is characterized in that: during the test direct-through line, selector switch (7) is connected earth potential; During the test cross spider, selector switch (7) connects noble potential.
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| CN2009101180528A CN101487872B (en) | 2009-02-17 | 2009-02-17 | Network cable test method and device |
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| CN2009101180528A CN101487872B (en) | 2009-02-17 | 2009-02-17 | Network cable test method and device |
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| CN101487872B true CN101487872B (en) | 2011-10-19 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT11168U3 (en) * | 2009-10-22 | 2010-12-15 | Avl List Gmbh | METHOD AND ARRANGEMENT FOR MEASURING DATA MEASURING WITH VERIFYING THE WIRING |
| CN101833889B (en) * | 2010-04-27 | 2013-11-06 | 广州市唯康通信技术有限公司 | Digital display twisted-pair termination detecting device |
| CN102269791B (en) * | 2011-04-27 | 2013-09-04 | 兰州交通大学 | Online monitoring and positioning method of railway signal cable disconnection fault |
| KR101315416B1 (en) * | 2011-12-21 | 2013-10-07 | (주)갑진 | Connecter misconnecting detection system |
| CN105676051A (en) * | 2016-01-21 | 2016-06-15 | 北京荣达千里科技有限公司 | Integrated line sequence testing device and method |
| CN106646135B (en) * | 2016-12-27 | 2023-10-10 | 浙江电力变压器有限公司温州昌泰电力开关分公司 | Dedicated test box of prepackage type quick connector, cable |
| CN114172539B (en) * | 2022-02-10 | 2022-04-19 | 北京国科天迅科技有限公司 | Detection method, detection circuit, computer device and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6002247A (en) * | 1996-08-07 | 1999-12-14 | Watkins; Lee A. | Method for determining correct pairing of bundled twisted wire pair circuitry |
| CN1050199C (en) * | 1994-11-11 | 2000-03-08 | 韩佰锋 | Cable signal detecting and measuring apparatus |
| CN2552009Y (en) * | 2001-12-26 | 2003-05-21 | 徐先 | Network cable fault measurer |
-
2009
- 2009-02-17 CN CN2009101180528A patent/CN101487872B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050199C (en) * | 1994-11-11 | 2000-03-08 | 韩佰锋 | Cable signal detecting and measuring apparatus |
| US6002247A (en) * | 1996-08-07 | 1999-12-14 | Watkins; Lee A. | Method for determining correct pairing of bundled twisted wire pair circuitry |
| CN2552009Y (en) * | 2001-12-26 | 2003-05-21 | 徐先 | Network cable fault measurer |
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Application publication date: 20090722 Assignee: Zhangzhou Dongnan Electronic Technology Research Institute Co., Ltd. Assignor: Xu Xian Contract record no.: 2013350000133 Denomination of invention: Network cable test method and device Granted publication date: 20111019 License type: Exclusive License Record date: 20130815 |
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