content.htm

来自「ccna」· HTM 代码 · 共 110 行

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<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>Content</title>
<base target="contents">
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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" size="3" color="#008080">Recognized
            horizontal twisted-pair cables</font></b><font face="Arial" size="3"><b><font color="#008080">
            </font><font color="#CCCC00">::</font></b></font></td>
          <td width="10%">
            <p align="right"><font face="Arial" size="3" color="#008080"><b>2/55</b></font></td>
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      <img border="0" src="../../images/transdot.gif" width="1" height="15"></td>
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    <td><img border="0" src="../../images/transdot.gif" width="45" height="1"></td>
    <td><font size="2" face="Arial">Two types of cables are recognized and
      recommended for use in the horizontal cabling system. These cables are:</font>
      <ol>
        <li><font size="2" face="Arial">four-pair 100 Ohm unshielded 
          twisted-pair (UTP) or screened twisted-pair (ScTP) cables, 0.51 mm (24 
          AWG) to 0.64 mm (22 AWG) in diameter.</font></li> 
      </ol>
      <blockquote>
        <p><font face="Arial" size="1">NOTE: Performance requirements for cables
        specified in ANSI/TIA/EIA-568-B.2.</font></p>
        <p><font size="2" face="Arial">The recognized categories of UTP cabling
        are:</font></p>
        <ul>
          <li><font size="2" face="Arial">Category 5e: This designation applies 
            to 100 Ohm UTP cables and associated connecting hardware whose 
            transmission characteristics are specified up to 100 MHz.</font></li> 
          <li><font size="2" face="Arial">Category 3: This designation applies 
            to 100 Ohm UTP cables and associated connecting hardware whose 
            transmission characteristics are specified up to 16 MHz.</font></li> 
          <li><font size="2" face="Arial">Categories 1, 2, 4 and 5 cables and
            connecting hardware are not recognized as part of ANSI/TIA/EIA-568-B.1
            and ANSI/TIA/EIA-568-B.2, therefore their transmission
            characteristics are not specified.</font></li>
        </ul>
      </blockquote>
      <img border="0" src="a.gif" align="right" width="200" height="102">
      <ol start="2">
        <li><font size="2" face="Arial">two or more cores of optical fiber multimode cable, either 62.5/125 祄 or 
          50/125 祄 cables.</font></li> 
      </ol>
      <blockquote>
        <p><font face="Arial" size="1">NOTE: Performance requirements for cables
        specified in ANSI/TIA/EIA-568-B.3. See a later section in this document
        for fiber performance.</font></p>
      </blockquote>
      <p><b><font size="2" face="Arial">Requirements</font></b></p>
      <p><font size="2" face="Arial">Recognized cables, associated connecting
      hardware, jumpers, patch cords, equipment cords, and work area cords shall
      meet all applicable requirements specified in ANSI/TIA/EIA-568-B.2 and
      ANSI/TIA/EIA-568-B.3.</font></p>
      <p><font size="2" face="Arial">When bundled and hybrid cables are used for
      horizontal cabling, each cable type shall be recognized and meet the
      transmission performance and color-code specifications for that cable type
      given in ANSI/TIA/EIA-568-B.2 and ANSI/TIA/EIA-568-B.3.</font></p>
      <blockquote>
        <p><font face="Arial" size="1">NOTE: 1 - Hybrid cables and bundled
        cables are those cables that are assembled prior to installation,
        sometimes referred to as loomed, speed-wrap, or whip cable
        constructions.</font></p>
        <p><font face="Arial" size="1">NOTE: 2 - There are a number of other
        application specific horizontal cable types that have been used in <img border="0" src="b.gif" align="right" width="200" height="100">telecommunications.
        Although these cables are not part of the requirements of the ANSI/TIA/EIA-568-B.1,
        ANSI/TIA/EIA-568-B.2 and ANSI/TIA/EIA-568-B.3 standards, they may be
        used in addition to the minimum requirements described above.</font></p>
        <p><font face="Arial" size="1">NOTE: 3 - Hybrid cables consisting of
        optical fiber cores and copper conductors are sometimes referred to as
        composite cables.</font></p>
      </blockquote>
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td colspan="2">
      <table border="0" width="100%" cellspacing="0" cellpadding="0">
        <tr>
          <td width="90%"><img border="0" src="../../images/arrow_up.gif" width="19" height="12"><b><font face="Arial" size="3" color="#008080">Recognized
            horizontal twisted-pair cables </font></b><font face="Arial" size="3"><b><font color="#CCCC00">::</font></b></font></td>
          <td width="10%">
            <p align="right"><font face="Arial" size="3" color="#008080"><b>2/55</b></font></td>
        </tr>
      </table>
    </td>
  </tr>
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