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參數(shù)資料
| 型號(hào)： | LXT9784 |
| 廠商： | Intel Corp. |
| 英文描述： | Transceiver Hardware Integrity Function Overview |
| 中文描述： | 收發(fā)器硬件完整性函數(shù)概述 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 191K |
| 代理商： | LXT9784 |
LXT9784 Octal 10/100 Transceiver Hardware Integrity Function Overview
Application Note
7
2.0
Transmission Lines and Return Wave Theory
All transmission lines have two coexisting waves propagating through the media at the same time.
The main wave is the forward wave propagating from the transmitter to the receiver. The second
wave is a return wave created by an imperfect line or load and propagates from the load to the
source (or transmitter).
2.1
Cable Terminations and Return Loss
A perfectly terminated line is defined as a line with no attenuation and an impedance that is equal
to the source
’
s impedance and with a load that is equal to the line impedance as well. For a
perfectly terminated line the return wave is zero. In that case the load receives all the forward wave
energy.
In an open line, meaning there is no load connected to its end, the return wave amplitude is equal to
the forward wave amplitude. The same applies for a short circuit line.
The reflection coefficient is defined as:
Reflected wave
Forward wave=
Where
Z
L is the load impedance
Z
0 is the cable impedance
The return loss in (dB) is defined as:
Figure 1
illustrates the forward and return waves within a cable system.
Table 1
describes the
Return Loss as a function of Load Impedance for cable with characteristic impedance of 100
(typical CAT5 UTP cable impedance).
T
L
=
V-
V+
=Z
L
- Z
0
Z
L
+ Z
0
RL(db) = 20log
10
|1/T
L
| = 20log
10
Z
L
+ Z
0
Z
L
-
Z
0
Table 1. Typical CAT5 Return Loss
Load Impedance
(
)
Return Loss
(dB)
V-/V+
∞
(open load)
0
1
300
6
0.5
192
10
0.316
138
16
0.158
100 (perfectly terminated
load)
∞
0
73
16
-0.158
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