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Method and device for testing network cable failure

A fault testing and cable technology, applied in fault location, selection device, electrical components, etc., to achieve the effect of high test resolution, high cost performance and simple operation

Inactive Publication Date: 2008-02-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the current network cables mostly use Category 5 or Super Category 5 cables, and the transmission signals are groundless differential signals.
However, the transmission pulse used by the pulse reflection method is a narrow pulse signal referenced to the ground, so it is not suitable to use the pulse reflection method based on a narrow pulse to test the length of network cables.

Method used

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  • Method and device for testing network cable failure
  • Method and device for testing network cable failure

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Embodiment Construction

[0036] The following examples further illustrate the present invention in detail, but do not limit the scope of the present invention in any way.

[0037] The detection pulse generation and transmission can be selected according to the required test range. If the detection pulse width is unreasonably selected, the transmitted pulse and the reflected echo will not form a superposition, which increases the difficulty of detection, and it is impossible to distinguish whether it is a short circuit. The fault is still a short-circuit fault. The formation of the detection pulse (completed by a high-speed timer) recommends the use of high-performance programmable logic devices (FPGA) to ensure the sharp rising edge characteristics of the detection pulse. Use a high-speed single-ended-differential converter to convert the single-ended probe pulse into a differential probe pulse, and then send it to the cable under test after being driven by a high-speed buffer and impedance matching. The ...

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Abstract

The utility model provides a fault testing proposal over network cables. Wider differential detection pulses are sent out from a testing end. When encountering a break point on the cable, the detection pulses are reflected, and the reflected pulses are transmitted back to the sending end along the cable. The sending signal and the reflected signal are mutually superposed, and the time interval between the sending and reflected signals is calculated by measuring the time width of the superposed part; then the position and cause of the failure can be analyzed out. The proposal in the utility model also provides a relevant network cable tester. Four pairs of twisted network cables can be tested just by connecting any end of the network cable with the tester. The tester in the utility model has advantages of simple operation, high resolution and negligible environmental impact. Beside application in network cable fault testing, the testing proposal and device in the utility model can be also used in coaxial cable fault testing.

Description

Technical field [0001] The present invention relates to the field of network cable testing, in particular to a technical method and device capable of effectively testing the length of a network cable. Background technique [0002] With the development and popularization of computer networks, network security is particularly important for various industries. However, some network failures due to design reasons or improper maintenance often bring huge economic losses and catastrophic consequences. In the middle, faults caused by network cables accounted for a large part. The damage or wrong connection of the network cable will lead to chaos in data transmission, and the network will be blocked, which will seriously affect the use and safety of the computer communication network. [0003] The network cable tester can verify the twisted pair. It can measure the length of the twisted pair, find the location and reason of the breakpoint, and test the wiring diagram (short circuit, open...

Claims

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Application Information

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IPC IPC(8): H04Q1/20G01R31/08
Inventor 王厚军田书林肖寅东刘科李飞雄
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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