Matching absorber for reducing damage of bridge tap to cable transmission performance

A technology for bridging taps and cable transmission is applied in the field of matching absorbers, which can solve the problems of high reconstruction cost and difficult implementation, and achieve the effects of short installation time, lower end face reflection coefficient, and lower end face reflection.

Active Publication Date: 2012-04-18
CHINA TELECOM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering that the complete removal of bridge taps has high transformation costs, difficult implementation, and does not adapt to the rapid changes in business requirements, it is a better choice to use other means to reduce the impact of bridge taps

Method used

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  • Matching absorber for reducing damage of bridge tap to cable transmission performance
  • Matching absorber for reducing damage of bridge tap to cable transmission performance
  • Matching absorber for reducing damage of bridge tap to cable transmission performance

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Embodiment Construction

[0026] Specific implementations of the matching absorber of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the same or similar reference numerals represent the same or similar components.

[0027] Now, refer to figure 2 The principle and application of the matched absorber used to eliminate the influence of the bridge tap in the present invention will be described in detail. As shown in the figure, the matching absorber 4 based on the LRC circuit of the present invention is mainly composed of an inductor 1 , a resistor 2 and a capacitor 3 . The inductor 1 , the resistor 2 and the capacitor 3 are connected in series, and the two ends connected in series are connected to the line of the bridge tap 14 .

[0028] According to the previous introduction, in order to eliminate the absorption peak at the center frequency f0 that has the most serious impact on the system, the impedance of the LRC matching circuit shou...

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Abstract

This invention relates to a match absorber used in reducing harm of cable transmission performance by bridge taps including an impedance match circuit matching the total impedance with the cable bridged on the circuit of the tap for absorbing the electromagnetic signal of a specific frequency coupled in the tap, optionally, said absorber includes a serial structure of inductor, resistor and a capacitor and adjusts capacitance value according to the length of the tap by an adjustable capacitor to suit taps of different lengths, when an electromagnetic wave signal coupled to the tap is transmitted to the end of the tap, the absorber can absorb a wave of specific frequency, reduce its reflection rate and interference generated by the wave reflecting to the primary loop, improve its frequencyresponse character and increase the transmission ability of the DSL system.

Description

technical field [0001] The invention relates to a telecommunication access network system, in particular to a matched absorber. Background technique [0002] With the rapid development of the Internet and the development of new services and applications such as IPTV, higher requirements are placed on access bandwidth, and broadband access networks have become the focus of telecom operators' network construction and business development. In order to make full use of existing copper wire resources and provide users with broadband access services at a lower cost, telecom operators at home and abroad generally adopt Digital Subscriber Loop (DSL) technology, including ADSL / ADSL2+, VDSL, SHDSL, HDSL Wait. Among them, ADSL is currently the most important broadband access method, with more than 100 million lines used worldwide, and more than 15 million lines in China. All kinds of DSL technologies utilize the unused high-frequency frequency bands in ordinary telephone copper wires...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B3/23
Inventor 姚良沈成彬沈世锦傅志仁
Owner CHINA TELECOM CORP LTD
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