CPF906G Ver la hoja de datos (PDF) - YCL Electronics

Número de pieza

componentes Descripción

Fabricante

CPF906G

Asymmetric Digital Subscriber Line

YCL Electronics  

Product Specification

CPF906G

4.4.2. Filter return loss test :

4.4.2.1. Description :

Return loss is essentially defined as the ratio of the power incident upon a given

transmission system to the power reflected caused by an impedance mismatch with

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

loss is generally expressed in decibels. General Return Loss equation as below:

Return loss = 20 log  ZR + Z M / ZR - Z M  dB

ZR = the reference impedance is shown in Fig. 6

Z M = the measured impedance is shown in Fig. 7

4.4.2.2. Test equipment :

a : HP 16047A Transformer Test Fixture

b : HP HP 4192A Analyzer or equivalent

c : Complex load ZL = 220ohm +820ohm //115nF

4.3.2.3. Test setup : is shown in below

4.3.2.4. Test procedure :

a : Set the measurement Frequency of interest

b : Calibrating the HP4192A L.C.Z. impedance Analyzer via the short . open, load

c : Connecting the Analyzer to the Line side of splitter with the complex load

220ohm+820ohm//115nf across the POTS(ISDN) side. While ZADSL load can

be terminated with ZADSL load or open.

d : Measure the impedance value R +jX and calculate the Return loss expressed in

decibel from the equation Return loss = 20 log ZR + Z M / ZR – Z M  dB

e : Change another frequency of interest, then repeat step b~e.

Fig. 6

Note : ZADSL load can be terminated with ZADSL load or open

Data sheet subject to change without notice

Fig. 7

RDPS-POTS344(R0)04/03/2002

SHEET 11 OF 16

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