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參數(shù)資料
| 型號： | 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)： | 8/14頁 |
| 文件大?。?/td> | 191K |
| 代理商： | LXT9784 |
LXT9784 Octal 10/100 Transceiver Hardware Integrity Function Overview
8
Application Note
The System return loss performance is determined by three elements:
The transmitter return loss
The cable characteristic impedance and return loss
The receiver return loss
IEEE 802.3 specifies that the receiver and transmitter return loss must meet the following criteria:
.
There are additional factors that may affect the accuracy of the return loss measurement which are:
Connectors and patch panels
CAT5 UTP cable impedance can vary
±
15
All this means that setting a threshold of 6db return loss in a system return loss measurement
should cover transmitter, receiver connector and cable impedance variances and should trigger a
cable problem or anomaly indication. In other words, a good indication for a problem or an
anomaly in a cable is when the return wave is equal to or greater than one-half of the incident wave.
52
10
-0.316
33.3
6
-0.5
0 (short load)
0
-1
Figure 1. Forward and Return Waves
Table 1. Typical CAT5 Return Loss
Load Impedance
(
)
Return Loss
(dB)
V-/V+
Forward Wave
Return Wave
R
RJ45
Load Impedance Z
L
Cable Impedance Z
0
Load
Table 2. Tx and Rx Return Loss
Frequency
(MHz)
I/O Minimum Return Loss (dB)
2-30
16
30-60
16 to 10 by 16-20log(f/30 MHz)
60-100
10
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| LXT9784BC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN TRANSCEIVER|OCTAL|BGA|324PIN|PLASTIC |
| LXT9784BE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN TRANSCEIVER|OCTAL|BGA|324PIN|PLASTIC |
| LXT9785 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Advanced 8-Port 10/100 Mbps PHY Transceivers |
| LXT9785BC | 制造商:Intel 功能描述:DATACOM, ETHERNET TRANSCEIVER, PBGA241 |
| LXT9785BC.D0 | 制造商:Cortina Systems Inc 功能描述:DATACOM, INTERFACE CIRCUIT, PBGA241 |
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