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參數資料
| 型號： | MF602F |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Mirco Filter For ADSL CPE Side |
| 中文描述： | Mirco過濾器對于ADSL終端側 |
| 文件頁數： | 8/11頁 |
| 文件大小： | 56K |
| 代理商： | MF602F |
Product Specification
MF602F
Data sheet subject to change without notice
RDPS-MF017(R1)03/04/2002
SHEET 8 OF 11
4.4.2 : 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
Z
L
+ Z
M
/ Z
L
- Z
M
dB
Where Z
L
= the reference impedance Z
M
= the measured impedance
The test setup is shown in drawing below:
ZL
LPF
Equipment
ZL
Phone
Line
Load#1 LPF
Load#4 LPF
Remote POTS Splitter
Return loss reference
impedance
Test
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