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Low-pass filtering device for coupling xDSL channels

A low-pass filter and device technology, applied in the field of xDSL technology, can solve the problems of high filter cost and short cycle

Inactive Publication Date: 2005-07-13
LABE EUROEN ADSL LECOM FASTNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the conclusion is: on the one hand, considerable costs are required to manufacture this filter, and on the other hand, due to drastic changes in the ferrite market, there are sometimes severe periods of shortage

Method used

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  • Low-pass filtering device for coupling xDSL channels
  • Low-pass filtering device for coupling xDSL channels
  • Low-pass filtering device for coupling xDSL channels

Examples

Experimental program
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Embodiment Construction

[0047] Figure 6 The general structure of the low-pass filtering device 600 of the present invention is shown. The situation when it is placed on the subscriber side A of the line will be explained below. However, it can also be placed on the telephone exchange side. In this figure there is a conventional telephone line L comprising a first transmission line 601 called thin line A or line TIP and a second transmission line 602 called thin line B or line RING. On each transmission line 601 and 602, there are inductances 603 and 604, respectively. These two inductances have the same value due to the symmetry of the telephone line. Typically, this value is around 17.5mH (millihenry). On each transmission line there is an active component 605 of ASIC type connected in series with an inductor 603, 604 respectively. Likewise, then the two ASICs are identical.

[0048] The impedance of the ASIC inserted in the device of the present invention varies according to the frequency of...

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PUM

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Abstract

The invention concerns a low-pass filtering device (600) used on a telephone line (L) consisting of a first transmission line (601) and a second transmission line (602), capable of circulating simultaneously, between a telephone exchange (202) and a subscriber (A) equipped with at least a telephone (209), first signals corresponding to analog and / or digital narrow band services, and second signals corresponding to broadband services, the low-pass filter (600) comprising an active ASIC-type element (605; 606), arranged in series on each transmission line (601; 602) and preceded, on the line side (L), by an inductance type passive element (603; 604), likewise arranged in series on each transmission line (601; 602) of the line (L) and a capacitance (610) arranged between the two transmission lines (601; 602) of the line.

Description

technical field [0001] The present invention generally relates to the technical field known as xDSL technology. Among these technologies, for example, ADSL (Asymmetric Digital Subscriber Line) technology, VDSL (Very High Rate Digital Subscriber Line) technology, and HDSL or SDSL technology have been found. The present invention will be described in detail through examples under the framework of ADSL. However, the invention can also be applied in conjunction with other xDSL technologies. These techniques can actually be applied in the local loop of the existing telephone network formed by the intermediary of the network between the central telephone and the subscriber telephones. An essential purpose of these techniques is to realize the simultaneous transmission of different types of signals on the local loop of the former telephone network: on the one hand, these signals relate to the usual conversation between two users, these first signals include speech-related signals a...

Claims

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Application Information

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IPC IPC(8): H03H11/04H03H11/34
CPCH03H7/1766H03H7/427
Inventor 埃里克·贝尔托埃尔韦·德迪厄
Owner LABE EUROEN ADSL LECOM FASTNET