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<html><head><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>New Page 3</title><base target="_self"></head><body background="../../images/bgindex.gif" bgcolor="#F7DB7B" leftmargin=20 topmargin=10 marginwidth="20" marginheight="10"> <table border="0" width="420" cellspacing="0" cellpadding="2"> <tr> <td valign="top"> <p align="left"><font face="Arial" size="2"> <a name="REF14558"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UART</b></a><br> </font></p> <dl> <dd><font face="Arial" size="2"><strong>Universal Asynchronous Receiver/Transmitter</strong>. Integrated circuit, attached to the parallel bus of a computer, used for serial communications. The UART translates between serial and parallel signals, provides transmission clocking, and buffers data sent to or from the computer.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF24535"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UB Net/One</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Ungermann-Bass Net/One</strong>. Routing protocol, developed by UB Networks, that uses hello packets and a path-delay metric, with end nodes communicating using the XNS protocol. There are a number of differences between the manner in which Net/One uses the XNS protocol and the usage common among other XNS nodes.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF22663"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UBR</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Unspecified bit rate</strong>. QOS class defined by the ATM Forum for ATM networks. UBR allows any amount of data up to a specified maximum to be sent across the network, but there are no guarantees in terms of cell loss rate and delay. Compare with <i><a href="a.html#REF22745">ABR</a> (available bit rate)</i>, <a href="c.html#REF35909"><i>CBR</i></a>, and <a href="v.html#REF34801"><i>VBR</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF34459"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UDP</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>User Datagram Protocol</strong>. Connectionless transport layer protocol in the TCP/IP protocol stack. UDP is a simple protocol that exchanges datagrams without acknowledgments or guaranteed delivery, requiring that error processing and retransmission be handled by other protocols. UDP is defined in RFC 768.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF17113"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UL</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Underwriters Laboratories</strong>. Independent agency within the United States that tests product safety.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF31421"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>ULP</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Upper-layer protocol</strong>. Protocol that operates at a higher layer in the OSI reference model, relative to other layers. ULP is sometimes used to refer to the next-highest protocol (relative to a particular protocol) in a protocol stack.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>unbalanced configuration</b><br> </font> <dl> <dd><font size="2" face="Arial">HDLC configuration with one primary station and multiple secondary stations.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>Underwriters Laboratories</b><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="u.html#REF17113"><i>UL</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF31769"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>Ungermann-Bass Net/One</b></a><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="u.html#REF24535"><i>UB Net/One</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF29467"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>UNI</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>User-Network Interface</strong>. ATM Forum specification that defines an interoperability standard for the interface between ATM-based products (a router or an ATM switch) located in a private network and the ATM switches located within the public carrier networks. Also used to describe similar connections in Frame Relay networks. See also <a href="n.html#REF15922"><i>NNI</i></a>, <a href="q.html#REF10330"><i>Q.920/Q.921</i></a> and <i><a href="s.html#REF31401">SNI</a> (Subscriber Network Interface)</i>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF27561"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>unicast</b></a><br> </font> <dl> <dd><font size="2" face="Arial">Message sent to a single network destination. Compare with <a href="b.html#REF35201"><i>broadcast</i></a> and <a href="m.html#REF22504"><i>multicast</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF16583"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>unicast address</b></a><br> </font> <dl> <dd><font size="2" face="Arial">Address specifying a single network device. Compare with <a href="b.html#REF42058"><i>broadcast address</i></a> and <a href="m.html#REF36519"><i>multicast address</i></a>. See also <a href="u.html#REF27561"><i>unicast</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>uninsured traffic</b><br> </font> <dl> <dd><font size="2" face="Arial">Traffic within the excess rate (the difference between the insured rate and maximum rate) for a VCC. This traffic can be dropped by the network if congestion occurs. See also <a href="c.html#REF41149"><i>CLP</i></a>, <a href="i.html#REF30162"><i>insured rate</i></a>, and <a href="m.html#REF16085"><i>maximum rate</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF15927"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>unipolar</b></a><br> </font> <dl> <dd><font size="2" face="Arial">Literally meaning one polarity, the fundamental electrical characteristic of internal signals in digital communications equipment. Contrast with <a href="b.html#REF15051"><i>bipolar</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>unity gain</b><br> </font>⌨️ 快捷键说明
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