参数资料
型号: MF600SWI
厂商: Electronic Theatre Controls, Inc.
英文描述: Mirco Filter For ADSL CPE Side
中文描述: Mirco过滤器对于ADSL终端侧
文件页数: 9/11页
文件大小: 119K
代理商: MF600SWI
Product Specification
MF600SWI
Data sheet subject to change without notice
RDPS-MF051(R1)10/01/2002
SHEET 9 OF 11
5.5.2. 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 LCR impedance analyzer being selected in impedance mode.
Return loss is general expressed in decibels. General return loss equation is as follows.
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.
5.5.2.1. Complex* return loss with ATU-R :
Figure 3.
5.5.2.2. 600 ohm return loss with ATU-R :
Figure 4.
ZNL-r definition:
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