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ccna

        <dl>
          <dd><font size="2" face="Arial">In broadband networks, the balance
            between signal loss and signal gain through amplifiers.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>Universal Asynchronous
        Receiver/Transmitter</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">See <a href="u.html#REF14558"><i>UART</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>Universal Resource Locator</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">See <a href="u.html#REF34027"><i>URL</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UNIX</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">Operating system developed in 1969 at
            Bell Laboratories. UNIX has gone through several iterations since
            its inception. These include UNIX 4.3 BSD (Berkeley Standard
            Distribution), developed at the University of California at
            Berkeley, and UNIX System V, Release 4.0, developed by AT&amp;T.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UNIX-to-UNIX Copy Program</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">See <a href="u.html#REF24875"><i>UUCP</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>unnumbered frames</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">HDLC frames used for various control
            and management purposes, including link startup and shutdown, and
            mode specification.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>unshielded twisted-pair</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">See <a href="u.html#REF38586"><i>UTP</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>unspecified bit rate</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">See <a href="u.html#REF22663"><i>UBR</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UPC</b><br>
        </font>
        <dl>
          <dd><font face="Arial" size="2"><strong>Usage parameter control</strong>.
            See <a href="t.html#REF19347"><i>traffic
            policing</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>upper-layer protocol</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">See <a href="u.html#REF31421"><i>ULP</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UPS</b><br>
        </font>
        <dl>
          <dd><font face="Arial" size="2"><strong>Uninterruptable power supply</strong>.
            Backup device designed to provide an uninterrupted power source in
            the event of a power failure. They are commonly installed on all
            file servers and wiring hubs.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>Urgent Pointer</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">Indicates the end of the urgent data.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><a name="REF34027"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>URL</b></a><br>
        </font>
        <dl>
          <dd><font face="Arial" size="2"><strong>Universal Resource Locator</strong>.
            Standardized addressing scheme for accessing hypertext documents and
            other services using a WWW browser. See also <a href="w.html#REF31186"><i>WWW
            browser</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>usage parameter control</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">See <a href="t.html#REF19347"><i>traffic
            policing</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>USENET</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">Initiated in 1979, one of the oldest
            and largest cooperative networks, with over 10,000 hosts and a
            quarter of a million users. Its primary service is a distributed
            conferencing service called news.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>User Datagram Protocol</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">See <a href="u.html#REF34459"><i>UDP</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>User-Network Interface</b><br>
        </font>
        <dl>
          <dd><font size="2" face="Arial">See <a href="u.html#REF29467"><i>UNI</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><a name="REF38586"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UTP</b></a><br>
        </font>
        <dl>
          <dd><font face="Arial" size="2"><strong>Unshielded twisted-pair</strong>.
            Four-pair wire medium used in a variety of networks. UTP does not
            require the fixed spacing between connections that is necessary with
            coaxial-type connections. There are five types of UTP cabling
            commonly used: <a href="c.html#REF20266"><i>Category
            1 cabling</i></a>, <a href="c.html#REF33612"><i>Category
            2 cabling</i></a>, <a href="c.html#REF34835"><i>Category
            3 cabling</i></a>, <a href="c.html#REF19524"><i>Category
            4 cabling</i></a>, and <a href="c.html#REF24442"><i>Category
            5 cabling</i></a>. Compare with <a href="s.html#REF42356"><i>STP</i></a>.
            See also <a href="e.html#REF41680"><i>EIA/TIA-586</i></a>
            and <a href="t.html#REF16539"><i>twisted
            pair</i></a>.<br>
            </font></dd>
        </dl>
        <p><font face="Arial" size="2"><a name="REF24875"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UUCP</b></a><br>
        </font>
        <dl>
          <dd><font face="Arial" size="2"><strong>UNIX-to-UNIX Copy Program</strong>.
            Protocol stack used for point-to-point communication between UNIX
            systems.</font></dd>
        </dl>
      </td>
    </tr>
  </table>

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