CN110531180A - A kind of method and device for testing crosstalk between big logarithm cable cable - Google Patents
A kind of method and device for testing crosstalk between big logarithm cable cable Download PDFInfo
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- CN110531180A CN110531180A CN201810500578.1A CN201810500578A CN110531180A CN 110531180 A CN110531180 A CN 110531180A CN 201810500578 A CN201810500578 A CN 201810500578A CN 110531180 A CN110531180 A CN 110531180A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The present invention provides the method and device that crosstalk between a kind of big logarithm cable cable is tested, method includes that cable under test is marked, the processing of straight line bunchy is done to the cable after label, forms cable group, the cable group includes a center cable and the peripheral cable that is evenly distributed on around middle line cable；By every group of line at the both ends for the cable under test handled well to proximally and distally wiring guide groove is respectively connected to, wherein the line of cable under test proximal end and the cable in distal lugs guide groove corresponds sequence；It is proximally and distally respectively connected to tester by every cable under test of switching, realizes the crosstalk test of cable under test；The present invention can carry out under the premise of not changing existing equipment, crosstalk is tested between realizing the cable between any two cables, under the premise of can guarantee that test data is accurate, the cost performance of logarithm test equipment can be greatly improved, test frequency can reach 1G and meet 7A testing standard.
Description
Technical field
The present invention relates to wire and cable field more particularly to a kind of methods and dress for testing crosstalk between big logarithm cable cable
It sets.
Background technique
With the rapid development of computer technology and network technology, the high speed of data transmission, security reliability are more and more
It being valued by people, the demand driving in market data transmit main carriers --- further development of optical cable, due to
The fast development of symmetrical category cables more and more extensive use and local area network itself in a local network is to communication cable
The harsh performance requirement of proposition, makes cable manufacturer more and more pay attention to the detection means of cable.And increasingly increased intelligence
The number of information terminal produces the increase in demand to big pair count cable.Big logarithm cable for digital communication has paving with respect to optical cable
If the advantages that convenient, cable-management is succinct, at low cost, therefore many comprehensive wiring systems are at present or big logarithm is selected in preparation
Transmission medium of the cable for digital communication as riser backbone subsystem.The high speed development of information digitalization has expedited the emergence of big logarithm digital communication
The appearance of cable.And will continue to develop to the direction of high-speed, big logarithm from now in digital cable, meanwhile, to its performance
It also proposed high requirement, the performance of big pair count cable is often the bottleneck for limiting data transmission.
Currently, the cable manufacturer of world's most countries is all proposed big pair count cable product.Domestic manufacturer
Largely introduce such production line or spontaneous development such production line.In the development and manufacture of big pair count cable, only pass through and
When, the correct every actual performance index for grasping cable, and adjusting process can just produce qualified big logarithm number electricity in time
Cable.This just needs advanced test product that can be competent at the test of big logarithm digital cable, but such test product state at present
Inside and outside big logarithm test equipment is at high price, and is tested using the method that method of substitution etc. less standardizes, and undoubtedly will affect
The quality of produced cable also has a adverse impact to the technological progress of domestic cable industry.Therefore, it is necessary to a kind of new to be
Technological means can reduce as far as possible the cost of test equipment under the premise of guaranteeing measuring accuracy to improve cost performance,
To drive symmetrical category cables industry to develop to higher level direction, to General Promotion China symmetrical category cables
The integral level of industry plays positive impetus.
Summary of the invention
In view of the foregoing deficiencies of prior art, the present invention provides a kind of side for testing crosstalk between big logarithm cable cable
Method, to solve the above technical problems.
The method of crosstalk between the big logarithm cable cable of test provided by the invention, comprising:
Cable under test is marked,
The processing of straight line bunchy is done to the cable after label, forms cable group, the cable group include center cable with
And it is evenly distributed on the peripheral cable around middle line cable；
By every group of line at the both ends for the cable under test handled well to proximally and distally wiring guide groove is respectively connected to, wherein to be measured
The line of cable in cable proximal end and distal lugs guide groove corresponds sequence；
It is proximally and distally respectively connected to tester by every cable under test of switching, realizes that the crosstalk of cable under test is surveyed
Examination.
Further, crosstalk test includes near-end cross test and far-end cross talk test, by near-end cross test and
Far-end cross talk test obtains test parameter, and the test parameter includes outer portion near end crosstalk attenuation, outer distal end crosstalk attenuation, outer
Portion distal end attenuation to crosstalk ratio, outer portion near end and outer distal end crosstalk attenuation power and outer portion near end crosstalk volume and and outside
Far-end crosstalk power and.
Further, using the peripheral cable as main string cable, using the center cable as by string cable, peripheral cable
It is equidistantly fixed between center cable.
Further, cable group progress is subjected to circulation laying within the scope of preset spacing threshold, or in the electricity
The periphery setting support cable of cable group, makes cable group form the overall structure for being easy to wind by support cable, is wound paving
If.
Further, by successively by the cable proximal end of same label wired local interface docked into tester,
Distal end wired remote interface docked into tester, obtain wired pair of attenuation test result；
By successively by the p-wire of each peripheral cable proximal end to the local interface for being connected to tester, by center cable
The p-wire of proximal end obtains the near-end cross talk crosstalk measuring of peripheral cable center line cable to the remote interface for being linked into tester
As a result；
By successively by the p-wire of each peripheral cable proximal end to the local interface for being connected to tester, by center cable
The p-wire of distal end obtains the far-end cross talk crosstalk measuring of peripheral cable center line cable to the remote interface for being linked into tester
As a result.
Further, non-tested one end access terminal matching impedance of the tested cable of test equipment, the terminal will be accessed
Matching impedance is equal with the nominal characteristic impedance modulus value of line pair.
Further, the quantity of the peripheral cable be 6, it is described support cable quantity be 2, the support cable and
Peripheral cable forms parallelogram sturcutre.
The present invention also provides crosstalk devices between a kind of big logarithm cable cable of test, comprising:
Fixed cell forms cable group, the cable group includes one for doing the processing of straight line bunchy to the cable after label
Root center cable and the peripheral cable being evenly distributed on around middle line cable；
Test cell, for testing for the cable under test to access；
Fixture, including proximally and distally, the line at the both ends for the cable under test for being respectively used to and handling well to connection, wherein to
The line for surveying the cable in cable proximal end and distal lugs guide groove corresponds sequence；
It is proximally and distally respectively connected to test cell by every cable under test in switching fixture, completes cable under test
Crosstalk test.
Further, further include balance converter, carry out nominal impedance matching for balance ports impedance and to tested cable
Beneficial effects of the present invention: the method for crosstalk between the big logarithm cable cable of test in the present invention can not change
It is carried out under the premise of existing equipment, crosstalk is tested between realizing the cable between any two cables, can guarantee that test data is accurate
Under the premise of, the cost performance of logarithm test equipment can be greatly improved, test frequency can reach 1G and meet 7A testing standard, lead to
Crossing the present invention can drive symmetrical category cables industry to develop to higher level direction, to General Promotion China symmetrical figure
The integral level of communication cable industry has positive impetus.
Detailed description of the invention
Fig. 1 be the embodiment of the present invention test outer portion near end cross-talk between big logarithm cable cable in the method for crosstalk test it is former
Manage schematic diagram.
Fig. 2 be the embodiment of the present invention test outer distal end cross-talk between big logarithm cable cable in the method for crosstalk test it is former
Manage schematic diagram.
Fig. 3 is the section signal for the bunched cables that the embodiment of the present invention is tested between big logarithm cable cable in the method for crosstalk
Figure.
Fig. 4 is the test scene cloth for the bunched cables that the embodiment of the present invention is tested between big logarithm cable cable in the method for crosstalk
Set schematic diagram.
Fig. 5 is that the bunched cables that the embodiment of the present invention is tested between big logarithm cable cable in the method for crosstalk are placed on drum
Test scene arrangement schematic diagram.
Fig. 6 is the structural schematic diagram that the embodiment of the present invention tests crosstalk device between big logarithm cable cable.
Fig. 7 is that the embodiment of the present invention tests signal between big logarithm cable cable in crosstalk method to unshielded cable processing
Figure.
Fig. 8 is that the embodiment of the present invention is tested between big logarithm cable cable in crosstalk method to the schematic diagram of total shielded cable.
Fig. 9 is that the embodiment of the present invention is tested between big logarithm cable cable in crosstalk method to the schematic diagram of total score shielded cable.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in schema then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
As shown in Figure 1, between the big logarithm cable cable of test in the present embodiment crosstalk method, comprising:
Cable under test is marked,
The processing of straight line bunchy is done to the cable after label, forms cable group, the cable group include center cable with
And it is evenly distributed on the peripheral cable around middle line cable；
By every group of line at the both ends for the cable under test handled well to proximally and distally wiring guide groove is respectively connected to, wherein to be measured
The line of cable in cable proximal end and distal lugs guide groove corresponds sequence；
It is proximally and distally respectively connected to tester by every cable under test of switching, realizes that the crosstalk of cable under test is surveyed
Examination.
In the present embodiment, first well in advance should be needed to mark on every cable before test, these cables should be using the same as all one's life
Produce batch, the both ends of cable under test should be fanned out to, be fanned out to length should no more than 1m, measurement should in frequency range as defined in cable into
Row.Test principle is that 1 as main string cable around center of peripheral 6 cables carries out (hereinafter referred to as 1+6) by string cable.
Main string cable is successively tested with centrally located by string cable in order.It may be implemented to go here and there between the cable between any two cables
Test is disturbed, by the replacement of different cables, the test of crosstalk between 4*7 (1000M) cable is finally realized, exports crosstalk between complete cable
Test report.
In the present embodiment, the crosstalk test includes near-end cross test and far-end cross talk test, passes through near-end cross
Test and far-end cross talk test obtain test parameter, and the test parameter includes outer portion near end crosstalk attenuation, outer distal end cross-talk
Decaying, outer distal end attenuation to crosstalk ratio, outer portion near end and outer distal end crosstalk attenuation power and outer portion near end crosstalk volume and with
And outer distal end crosstalk volume and.
Outer portion near end crosstalk attenuation (AFEXT) be expressed as respectively in different cables it is main get lines crossed to the proximal end got lines crossed pair
Crosstalk attenuation is indicated by following formula:
Wherein, ANEXT is outer portion near end crosstalk attenuation, and unit is decibel (dB)；The input work got lines crossed based on P1N to proximal end
Rate, unit are milliwatt (mW)；P2N is being the cross-talk output power got lines crossed to proximal end, and unit is milliwatt (mW)；Note: main to get lines crossed pair
From got lines crossed to need to be distributed in two different cables.
The difference that outer distal end attenuation to crosstalk ratio (AACR-F) is being expressed as outer distal end crosstalk attenuation and is being got lines crossed to decaying,
It is indicated by following formula:
Wherein, AFEXT is outer distal end crosstalk attenuation, and unit is decibel (dB)；The input work got lines crossed based on P1N to proximal end
Rate, unit are milliwatt (mW)；P2F is being the cross-talk output power got lines crossed to distal end, and unit is milliwatt (mW).
The difference that outer distal end attenuation to crosstalk ratio (AACR-F) is being expressed as outer distal end crosstalk attenuation and is being got lines crossed to decaying,
It is indicated by following formula:
AACR-F=AFEXT- α × l (formula 3)
Wherein, AACR-F is outer distal end attenuation to crosstalk ratio, and unit is decibel (dB)；AFEXT is that outer distal end cross-talk declines
Subtract, unit is decibel (dB)；α is being the attenuation constant got lines crossed pair, and unit is dB/ unit length；α × l is being to be got lines crossed to declining
Depreciation, unit are decibel (dB).
It outer portion near end and outer distal end crosstalk attenuation power and is indicated by following formula:
PSAX-talkj be line to the alien crosstalk power of j and, unit is decibel (dB)；
AX-talki, j, l be specified cable line to the line of j and adjacent cable to the crosstalk attenuation between i, unit is point
Shellfish (dB)；J is being the number got lines crossed pair；The number got lines crossed based on i pair；The number of string cable based on l；That gets lines crossed based on n pair is total
Quantity；The total quantity of string cable based on N.
As shown in Fig. 2, 7 cables are carried out the straight line bunchy in whole length in the present embodiment, the structure of 1+6 is formed.
Cable should keep straight during bunchy, not reverse, and uniformly be carried out equidistantly with insulating tape or other similar bands
It ties up, the overall structure of cable must not be destroyed, while the appropriateness between cable and cable being kept to be bonded again, it is preferable that the present embodiment
In tie up between be divided into 200mm.After cable sample ties up bunchy, it should be placed by defined requirement before test, under setting has
State two kinds:
Mode one: circulation laying is carried out by the scene requirement of Fig. 4, circulation minimum spacing should be not less than 100mm, be laid with place
It should select nonmetallicly.
Mode two: bundles of cable is wrapped in diameter and is at least on 1.2 meters of wood strip disk, as shown in figure 5, this mode
Need the cable of 9 same production batch.Wherein center cable is surrounded by 1#-6# cable, i.e., tested cross-talk cable.7#, 8# electricity
Cable is test support cable.When winding, by 8#, 5#, 4# are as first layer, and 6#, V#, 3# is as the second layer, 1#, 2#, 7# conduct
Third layer, 9 cables are wound shoulder to shoulder as a whole.
In the present embodiment, it is also necessary to to unshielded cable (UTP), total shielded cable (FTP) and total separated-shielding electricity
Beginning, the end of cable (STP) carry out corresponding access processing: sheath are peelled off, as shown in Fig. 7,8,9, it is preferable that the protection peelled off
Cover 3.8~4.2cm；The insulation 4cm or so for peelling off twisted pair again guarantees that shielded layer is not destroyed for there is shielded cable.
In the present embodiment, the cable twisted pair handled well is inserted into the wiring guide groove of proximal end and distal end in order respectively,
Bare wire is fixed on fixture insertion.The line of proximal end and distal end will correspond (i.e. if a, b of proximal end 1# slot sequence
End is respectively connected to white, blue line pair, then the end a, b of corresponding distal end 1# slot also accordingly connects white, blue line pair the other end).
In the present embodiment, as shown in fig. 6, in the present embodiment, by successively by the institute of the cable proximal end of same label
The local interface of wired pair of access tester, distal end wired remote interface docked into tester, obtain institute it is wired right
Attenuation test result；
By successively by the p-wire of each peripheral cable proximal end to the local interface for being connected to tester, by center cable
The p-wire of proximal end obtains the near-end cross talk crosstalk measuring of peripheral cable center line cable to the remote interface for being linked into tester
As a result；
By successively by the p-wire of each peripheral cable proximal end to the local interface for being connected to tester, by center cable
The p-wire of distal end obtains the far-end cross talk crosstalk measuring of peripheral cable center line cable to the remote interface for being linked into tester
As a result.
Correspondingly, the present embodiment also provides a kind of crosstalk device between testing big logarithm cable cable, comprising:
Fixed cell forms cable group, the cable group includes one for doing the processing of straight line bunchy to the cable after label
Root center cable and the peripheral cable being evenly distributed on around middle line cable；
Test cell, for testing for the cable under test to access；
Fixture, including proximally and distally, the line at the both ends for the cable under test for being respectively used to and handling well to connection, wherein to
The line for surveying the cable in cable proximal end and distal lugs guide groove corresponds sequence；
It is proximally and distally respectively connected to test cell by every cable under test in switching fixture, completes cable under test
Crosstalk test.
Further include balance converter in the present embodiment, carries out nominal impedance for balance ports impedance and to tested cable
The test cell of matching, the present embodiment uses vector network analyzer, when test equipment does not have balanced signal processing function,
Balance ports are converted by the uneven port of test equipment by balance converter, while realizing balance ports impedance and being tested
The matching of cable nominal impedance.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (9)
1. a kind of method for testing crosstalk between big logarithm cable cable characterized by comprising
Cable under test is marked；
The processing of straight line bunchy is done to the cable after label, forms cable group, the cable group is including a center cable and
The even peripheral cable being distributed in around middle line cable；
By every group of line at the both ends for the cable under test handled well to proximally and distally wiring guide groove is respectively connected to, wherein cable under test
The line of cable in proximal end and distal lugs guide groove corresponds sequence；
It is proximally and distally respectively connected to tester by every cable under test of switching, realizes the crosstalk test of cable under test.
2. the method for crosstalk between the big logarithm cable cable of test according to claim 1, it is characterised in that: the crosstalk test
Including near-end cross test and far-end cross talk test, test parameter, institute are obtained by near-end cross test and far-end cross talk test
Stating test parameter includes outer portion near end cross-talk, outer distal end cross-talk, outer portion near end crosstalk attenuation ratio, outer distal end crosstalk attenuation
Than and outer portion near end sound decaying specific power and outer distal end crosstalk attenuation specific power and outer portion near end crosstalk volume and and outer
Portion's far-end crosstalk power and.
3. the method for crosstalk between the big logarithm cable cable of test according to claim 1, it is characterised in that: by the periphery electricity
Cable is equidistantly fixed between peripheral cable and center cable as main string cable using the center cable as by string cable.
4. the method for crosstalk between the big logarithm cable cable of test according to claim 3, it is characterised in that: by the cable group
It is laid within the scope of preset spacing threshold, or in the periphery setting support cable of the cable group, passes through cable group
It supports cable to form parallelogram sturcutre, is wound laying.
5. the method for crosstalk between the big logarithm cable cable of test according to claim 2, it is characterised in that:
By successively by the cable proximal end of same label wired local interface docked into tester, distal end institute it is wired
To the remote interface of access tester, obtain wired pair of attenuation test result；
By successively by the p-wire of each peripheral cable proximal end to the local interface for being connected to tester, by center cable proximal end
P-wire to the remote interface for being linked into tester, obtain the near-end cross talk crosstalk measuring knot of peripheral cable center line cable
Fruit；
By successively by the p-wire of each peripheral cable proximal end to the local interface for being connected to tester, by center cable distal end
P-wire to the remote interface for being linked into tester, obtain the far-end cross talk crosstalk measuring knot of peripheral cable center line cable
Fruit.
6. the method for crosstalk between the big logarithm cable cable of test according to claim 5, it is characterised in that: tester will be accessed
Non- tested one end access terminal matching impedance of the tested cable of device, the nominal characteristic impedance of the terminal coupling impedance and line pair
Modulus value is equal.
7. the method for crosstalk between the big logarithm cable cable of test according to claim 4, it is characterised in that: the peripheral cable
Quantity be 6, it is described support cable quantity be 2, the support cable and peripheral cable formation parallelogram sturcutre.
8. crosstalk device between a kind of big logarithm cable cable of test characterized by comprising
Fixed cell forms cable group, the cable group includes in one for doing the processing of straight line bunchy to the cable after label
N-conductor cable n and the peripheral cable being evenly distributed on around middle line cable；
Test cell, for testing for the cable under test to access；
Fixture, including proximally and distally, the line at the both ends for the cable under test for being respectively used to and handling well is to connection, wherein electricity to be measured
The line of cable in cable proximal end and distal lugs guide groove corresponds sequence；
It is proximally and distally respectively connected to test cell by every cable under test in switching fixture, completes the string of cable under test
Disturb test.
9. crosstalk device between the big logarithm cable cable of test according to claim 7, which is characterized in that further include balanced transformation
Device carries out nominal impedance matching for balance ports impedance and to tested cable.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810500578.1A CN110531180A (en) | 2018-05-23 | 2018-05-23 | A kind of method and device for testing crosstalk between big logarithm cable cable |
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|---|---|---|---|
| CN201810500578.1A CN110531180A (en) | 2018-05-23 | 2018-05-23 | A kind of method and device for testing crosstalk between big logarithm cable cable |
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| CN201810500578.1A Pending CN110531180A (en) | 2018-05-23 | 2018-05-23 | A kind of method and device for testing crosstalk between big logarithm cable cable |
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Application publication date: 20191203 |