CPF101NW View Datasheet(PDF) - YCL Electronics

Part Name

Description

Manufacturer

CPF101NW

Product type: ISDN/POTS splitter. System application: asymmetric digital sudscriber line.

YCL Electronics  

Product Specification

CPF101NW

4.3.4. Filter Return Loss Test For POTS Function:

4.3.4.1. 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. 5

Z M = the measured impedance is shown in Fig. 6

4.4.2.2. Test Equipment :

a : HP 16047A Transformer Test Fixture

b : HP HP 4192A Analyzer or equivalent

c : Complex load ZL = 270ohm +750ohm //150nF

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 POTS(ISDN) side of splitter with the complex

load 270ohm+750ohm//150nf across the Line 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.

ZL

Load

ZR

Fig. 5

ISDN/Phone

ZM

ZL Load

line

Fig. 6

ADSL

ZADSL

Data sheet subject to change without notice

RDPS-POTS321(R1)03/15/2002

SHEET 10 OF 13

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