CPF104IG 데이터 시트보기 (PDF) - YCL Electronics

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CPF104IG

ISDN Filter for ADSL

YCL Electronics  

Product Specification

4.3.3. Filter Return Loss test for POTS port :

CPF104IG

Return loss measure the amount of energy that is lost due to reflection which resulted from

impedance mismatching at the interface. Return loss is essentially defined as the ratio of the

power incident upon a given transmission system to the power reflected caused by impedance

mismatch with respect to reference impedance at the interface between source and device.

Return loss figure are a function of the impedance of the circuit involved and are therefore

frequency dependent. These impedance must be closely maintained in order to reduce the

possibility of undesirable reflection and echoes which in long distance circuit the telephone user

or destroy the data being sent. To perform the return loss test ,open ,short, load calibration must

be done prior measurement while the LCZ impedance Analyzer being selected in impedance

mode. Return loss is general expressed in decibels.

General Return loss equation as below:

Return loss = 20 log ZLoad + ZM / ZLoad - ZMdB

Where ZLoad = the reference impedance ZM = the measured impedance

The test setup is shown in drawing below :

ZADSL

Data sheet subject to change without notice

RDPS-POTS434(R0)10/16/2002

SHEET 9 OF 11

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