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Test device and method for telephone line

A technology of telephone lines and testing devices, which is applied in the field of capacitance measurement and insulation resistance, and can solve problems such as the influence of resistance and capacitance, and achieve the effects of simple device, fast measurement, and cost-saving measurement

Inactive Publication Date: 2004-07-28
南通国邦科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of the mutual influence of resistance and capacitance in the external line test in the past, and provide a fast, high-precision and low-cost external line test device and method

Method used

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  • Test device and method for telephone line
  • Test device and method for telephone line
  • Test device and method for telephone line

Examples

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Embodiment Construction

[0030] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0031] The present invention establishes a circuit model consisting of resistance and capacitance for the user's outside line (including telephone set), such as figure 1 shown. In this model, there are a total of 6 components, the insulation resistance and capacitance between the A and B lines, the A line to ground, and the B line to ground, respectively expressed as R1, C1, R2, C2, R3, C3 (ie: AB The insulation resistance between the lines is represented by R1, and the capacitance is represented by C1; the insulation resistance between the A line and the ground is represented by R2, and the capacitance is represented by C2; the insulation resistance between the B line and the ground is represented by R3, and the capacitance is represented by C3), as shown in Fig. The resistances in are represented by conductance, which are G...

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PUM

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Abstract

The invention method is used to measure insulation resistance and capacitance between two outside lines on telephone, line, and which between each outside line to the ground. The measuring method is to measure ground resistance and capacitance after two outside lines are shortted and to measure ground resistance and capacitance of the outside line which is ungrounded after one outside line being grounded, then to calculate the unmeasured insulation resistance. The measuring device consists of constant-current source, data collecting unit, data processing and controlling unit, switching unit. Said invention method can protect the mutual influences of resistance and capacitance in outside line measuring and realize the outside line measuring with high speed, high precision and low cost.

Description

technical field [0001] The invention relates to the performance test of telephone subscriber lines, in particular to the measurement of the insulation resistance and capacitance between two external lines on the telephone line and the insulation resistance and capacitance of the two external lines to the ground respectively. Background technique [0002] In the maintenance of the existing telephone network, due to the wide distribution of user lines and the harsh environment, maintenance is very difficult. Short circuit, disconnection, ground gas, poor insulation, etc. will cause the user to be unable to communicate or the voice quality to decline. Therefore, rapid testing of external line parameters and fault location is of great significance for improving the quality of telecommunication services and reducing work intensity. [0003] According to the postal and telecommunications standards, the performance test and fault location of telephone subscriber lines mainly inclu...

Claims

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Application Information

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IPC IPC(8): H04M3/22
Inventor 胡春生熊杰俞义方
Owner 南通国邦科技发展有限公司