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Impedance blocking filter circuit

A filter and circuit technology, applied in the direction of impedance network, coupling substation interface circuit, electrical components, etc., can solve problems such as ADSL interference of terminal equipment

Inactive Publication Date: 2005-08-24
PULSE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since one or more telephone terminal equipment, such as a telephone, fax machine and / or voice mail, is also connected to the same incoming telephone line through the house line, terminal equipment that significantly limits or reduces the data rate will cause ADSL interference problem

Method used

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Examples

Experimental program
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Embodiment Construction

[0100] Referring now to the accompanying drawings in detail, figure 1 is a generalized block diagram showing a telecommunications system 10 interconnecting a telephone company's central office (CO) 12 with customer premises 14 via a transmission medium such as conventional twisted pair telephone lines 16 .

[0101] Telecommunications system 10 employs a plurality of impedance blocking filter circuits, each contained within a module housing 18, constructed in accordance with the principles of the present invention.

[0102] Central office 12 includes a central office switch 20 and an Internet service provider (ISP) 22 . The central office switch 20 sends the voice signal to the telephone line 16 through a low pass filter 24 and a surge protector 26 . ISP 22 transmits the ADSL data signal to modem 28 , and then to telephone line 16 through high pass filter 30 and surge protector 26 . It should be understood that voice signals from the central office switch 20 and ADSL data si...

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Abstract

An impedance blocking filter circuit is provided for use in telecommunication systems for interconnecting between incoming telephone lines and customer's terminal equipment so as to unconditionally block impedances above 20 KHz due to the customer's terminal equipment from an ADSL network unit and / or home networking interface unit. The filter circuit includes first, second, and third inductors (L5,L3,L1) connected in series between a first input terminal(66) and a first common point(A). A first resistor (R1) has its one end connected also to the first common point and its other end connected to a first output terminal. Fourth, fifth and sixth inductors (L6,L4,L2), are connected in series between a second input terminal(68) and a second common point(B). A second resistor (R2) has its one end also connected to the second common point and its other end connected to a second output terminal. A capacitor (C1) has its ends connected across the first and second common points. In other aspects, the filter circuit also includes switching means (K1,K2) for eliminating shunt additive capacitance and / or correction circuit means (TC1,TC2) reducing significantly return loss.

Description

[0001] The present invention is a divisional application of the application whose application number is 00122790.4, the application date is August 9, 2000, and the invention name is "impedance blocking filter circuit". [0002] Cross References to Related Applications [0003] This invention is based on a continuation-in-part of prior application Ser. No. 09 / 195,522. The earlier application was filed on November 19, 1998 and is entitled "Impedance Blocking Filter Circuit". technical field [0004] This invention relates generally to telecommunications systems, and more particularly to an impedance blocking filter circuit for use in a telecommunications system for connecting an incoming telephone line from a telephone company central office (C.O.) to a subscriber, such as a telephone, located in the subscriber's premises Or customer telephone equipment connected to unconditionally block the telephone impedance above 20KHz. Background technique [0005] By searching the subj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/52H03G7/00H03G11/00H03H1/00H03H7/01H03H7/06H04M1/24H04M11/04H04M11/06
CPCH03H1/0007H03H7/1766H03H7/427H03H7/0115H03G11/00H03G7/00H03H2001/005H04M11/062H03H7/06H03H9/52
Inventor F·J·基科
Owner PULSE ELECTRONICS