Network cable test method and device
A network cable and test method technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of inability to test cross lines, large sampling errors, long judgment time, etc., achieve high stability of sampling effects, and increase testing , the effect of perfect variety
Active Publication Date: 2011-10-19
徐先
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Problems solved by technology
[0014] 2. The sample and hold signal is a transient value, and the sampling error is large
Long judgment time and slow test speed
[0016] 4. It can only test straight-through lines, not crossover lines
Method used
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[0046] figure 1 Middle: square wave generator 1, multi-way switch 2, AC / DC converter 3, A / D converter 4, register 5, comparator 6, selection switch 7, load resistor 8, cable under test 9, terminal matcher 10.
[0047]Among them: square wave generator 1, multi-way switch 2, A / D converter 4, register 5, and comparator 6 are all composed of the same MCU, and the MCU uses PIC16C712; S1 and S2 are two multi-way strobe switches, which can It is composed of the I / O port of the MCU; when making twisted-pair phase-twisting judgment, the MCU generates a 1KHz square wave excitation signal through program control, which is output to the excited terminal by the multi-channel strobe switch S1, due to the distributed capacitance between the lines The presence of the multi-way strobe switch S2 will receive an input (response) signal from the connected terminal; this response signal is converted into a DC signal by the AC / DC converter 3, and then converted into a digital signal by the A / D co...
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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 inthe 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
Technical field [0001] The invention relates to a method and a corresponding device for testing network cables. Background technique [0002] The cables used to connect to the computer network are usually Category 5, Category 6, Category 7, etc., that is, T568A / B cables. The interior of these cables is essentially 4 twisted pairs; some are shielded and some are not. Both ends of the cable are connected to RJ45 connectors. Usually, the 1-2, 3-6, 4-5, and 7-8 terminals of the RJ45 connector are respectively connected to a pair of twisted pairs. Same, (such as T568A / B cable) see Figure 9 ; 2. Crossover cable: the connection methods at both ends are different. Terminals 1 and 2 at one end are connected to terminals 3 and 6 at the other end; terminals 3 and 6 are connected to terminals 1 and 2 at the other end. Figure 10 . [0003] Common faults of network cables include short circuit, open circuit, wrong connection, and reverse connection (the same pair of wires are connec...
Claims
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IPC IPC(8): G01R31/02G01R31/04
Inventor 徐先
Owner 徐先