<li><a title="Category 1="1" cable" href="http://en.wikipedia.org/wiki/Category_1_cable"><b>Cat 1</b></a>: <font color="red">Currently unrecognized by TIA/EIA.</font> Previously used for <a title="Plain old="old" telephone="telephone" service" href="http://en.wikipedia.org/wiki/Plain_old_telephone_service">POTS</a> telephone communications, ISDN and doorbell wiring.
<li><a title="Category 2="2" cable" href="http://en.wikipedia.org/wiki/Category_2_cable"><b>Cat 2</b></a>: <font color="red">Currently unrecognized by TIA/EIA.</font> Previously was frequently used on 4 Mbit/s <a title="Token ring" href="http://en.wikipedia.org/wiki/Token_ring">token ring</a> networks.
<li><a title="Category 3="3" cable" href="http://en.wikipedia.org/wiki/Category_3_cable"><b>Cat 3</b></a>: <font color="green">Currently defined in <a title="TIA/EIA-568-B" href="http://en.wikipedia.org/wiki/TIA/EIA-568-B">TIA/EIA-568-B</a>,</font> used for data networks using frequencies up to 16 MHz. Historically popular for 10 Mbit/s <a title="Ethernet" href="http://en.wikipedia.org/wiki/Ethernet">Ethernet</a> networks.
<li><a title="Category 4="4" cable" href="http://en.wikipedia.org/wiki/Category_4_cable"><b>Cat 4</b></a>: <font color="red">Currently unrecognized by TIA/EIA.</font> Defined up to 20 MHz, and was frequently used on 16 Mbit/s token ring networks.
<li><strong class="selflink"><b>Cat 5</b></strong>: <font color="red">Currently unrecognized by TIA/EIA.</font> Defined up to 100 MHz, and was frequently used on 100 Mbit/s Ethernet networks. May be unsuitable for 1000BASE-T gigabit ethernet.
<li><a title="Category 5="5" cable" href="http://en.wikipedia.org/wiki/Category_5_cable#Category_5"><b>Cat 5e</b></a>: <font color="green">Currently defined in <a title="TIA/EIA-568-B" href="http://en.wikipedia.org/wiki/TIA/EIA-568-B">TIA/EIA-568-B</a>.</font> Defined up to 100 MHz, and is frequently used for both 100 Mbit/s and 1000BASE-T Gigabit Ethernet networks.
<li><a title="Category 6="6" cable" href="http://en.wikipedia.org/wiki/Category_6_cable"><b>Cat 6</b></a>: <font color="green">Currently defined in <a title="TIA/EIA-568-B" href="http://en.wikipedia.org/wiki/TIA/EIA-568-B">TIA/EIA-568-B</a>.</font> Defined up to 250 MHz, more than double category 5 and 5e.
<li><a title="Category 6="6" cable" href="http://en.wikipedia.org/wiki/Category_6_cable#Category_6a"><b>Cat 6a</b></a>: <font color="green">Currently defined in <a class="new" title="ANSI/TIA/EIA-568-B.2-10 (page does="does" not="not" exist)" href="http://en.wikipedia.org/w/index.php?title=ANSI/TIA/EIA-568-B.2-10&action=edit&redlink=1">ANSI/TIA/EIA-568-B.2-10</a> and <a title="ISO/IEC 11801" href="http://en.wikipedia.org/wiki/ISO/IEC_11801">Amendment 1 and 2 of ISO/IEC 11801</a>.</font> Defined up to 500 MHz, double that of category 6. Suitable for <a class="mw-redirect" title="10 gigabit="gigabit" Ethernet" href="http://en.wikipedia.org/wiki/10_gigabit_Ethernet#10GBASE-T">10GBase-T</a>.
<li><a title="Category 7="7" cable" href="http://en.wikipedia.org/wiki/Category_7_cable"><b>Cat 7</b></a>: <font color="green">Currently defined in <a title="ISO/IEC 11801" href="http://en.wikipedia.org/wiki/ISO/IEC_11801">ISO/IEC 11801</a> Class F cabling.</font> Defined up to 600 MHz. This standard specifies four individually-shielded pairs (S/FTP) inside an overall shield.
<li><a title="Category 7="7" cable" href="http://en.wikipedia.org/wiki/Category_7_cable#Category_7a"><b>Cat 7a</b></a>: <font color="green">Currently defined in <a title="ISO/IEC 11801" href="http://en.wikipedia.org/wiki/ISO/IEC_11801">Amendment 1 and 2 of ISO/IEC 11801</a> Class FA cabling.</font> Defined up to 1,000 MHz. Cable constructions is S/FTP. </li>
<p> </p>
<p> </p>
<p>没有5B这种线~ E表示为 “超”。</p> |
liaozixiang
发表于 2010-6-30 15:42:00
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