MF600SWE Ver la hoja de datos (PDF) - YCL Electronics

Número de pieza

componentes Descripción

Fabricante

MF600SWE

Asymmetric Digital Subscriber Line

YCL Electronics  

Product Specification

MF600SWE

4.5.2. Return loss :

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 ZL + ZM / ZL - ZMdB

Where ZL = the reference impedance ZM = the measured impedance

The test setup is shown in drawing below:

Data sheet subject to change without notice

RDPS-MF054(R0)09/23/2002

SHEET 9 OF 11

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