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来自「ccna」· HTM 代码 · 共 65 行
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<td width="90%"><font face="Arial" size="3"><font color="#008080"><b><img border="0" src="../../images/arrow_down.gif" width="19" height="12"></b></font></font><b><font face="Arial" color="#008080" size="3">Pair-to
Pair ELFEXT and FEXT loss parameters</font></b> <font color="#CCCC00" size="3" face="Arial"><b>::</b></font></td>
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<p align="right"><font face="Arial" size="3" color="#008080"><b>33/55</b></font></td>
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<td><font face="Arial" size="2"><img border="0" src="../../images/transdot.gif" width="45" height="1"></font></td>
<td><font face="Arial" size="2">FEXT loss is a measure of the unwanted
signal coupling from a transmitter at the near-end into another pair
measured at the far-end. Pair-to-pair ELFEXT is expressed in dB as the
difference between the measured FEXT loss and the insertion loss of the
disturbed pair. PSELFEXT is a computed ratio that takes into account the
combined crosstalk on a receive pair from all the far-end disturbers
operating simultaneously. FEXT loss or pair-to-pair ELFEXT shall be
measured for all pair combinations for components and cabling, in
accordance with ASTM D4566 FEXT measurement procedure and in accordance
with Annex D of ANSI/TIA/EIA-568-B.2.</font>
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<td width="90%"><img border="0" src="../../images/arrow_up.gif" width="19" height="12"><b><font face="Arial" color="#008080" size="3">Pair-to
Pair ELFEXT and FEXT loss parameters</font></b> <font face="Arial" size="3"><b><font color="#CCCC00">::</font></b></font></td>
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<p align="right"><font face="Arial" size="3" color="#008080"><b>33/55</b></font></td>
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