名词解释：100BASE-X

译自wikipedia，http://is.gd/ksTYG

      100BASE-X（或者100BASE-T），有时又可称为Fast Ethernet，是现有以太

网标准的一个扩展。它使用UTP（非屏蔽双绞线，Unshielded Twisted Pair）或光纤

传输数据，使用CSMA/CD技术，拓扑结构与10BaseT相似，使用星型总线拓扑结构。

同时，它向下兼容10BASE-T系统，可以从10BASE-T系统以即插即用的方式升级。

坊间另一种理解是，100BASE-T与100BASE-X分别对应"FX"与"TX"的子细则。

     媒介类型标识符中的"100"传输速率为100Mbps；BASE是指传输的是基带信

号，即仅有以太网信号于媒介中传播。后缀"TX"、"FX"和"T4"均是指传播介

质。具体符号与介质对应关系如下：

        。TX：Two twisted-pairs of CAT 5 UTP or STP

        。FX：Fiber-optic cabling using 2-strand cable

        。T4：Four twisted-pairs of CAT 3, 4, or 5 UTP

 

原文如下：

The 100BASE-X standard, 100BASE-X is sometimes referred to as Fast Ethernet or 100BASE-T, is an extension of the existing Ethernet standard. It runs on UTP data or optical fiber cable and uses CSMA/CD in a star wired bus topology, similar to 10BaseT where all cables are attached to a hub. And, it provides compatibility with existing 10BASE-T systems and thus enables plug-and-play upgrades from 10BASE-T. Another saying said that it is actual 100BASE-T, 100BASE-X refers to the "FX" and "TX" sub-specs.

The "100" in the media type designation refers to the transmission speed of 100 Mbps. The "BASE" refers to baseband signalling, which means that only Ethernet signals are carried on the medium. The "TX", "FX"and "T4" refer to the physical medium that carries the signal.
It incorporates three media specifications:

posted on 2011-01-10 13:47  freshair_cn  阅读(3527)  评论(0)  编辑  收藏  举报

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