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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"> </font><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b><font face="Arial" size="2">V.24</font></b><font face="Arial" size="2"><br> </font></p> <dl> <dd><font size="2" face="Arial">ITU-T standard for a physical layer interface between DTE and DCE. V.24 is essentially the same as the EIA/TIA-232 standard. See also <a href="e.html#REF35209"><i>EIA/TIA-232</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF12108"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>V.25bis</b></a><br> </font> <dl> <dd><font size="2" face="Arial">ITU-T specification describing procedures for call setup and tear down over the DTE-DCE interface in a PSDN.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF11472"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>V.32</b></a><br> </font> <dl> <dd><font size="2" face="Arial">ITU-T standard serial line protocol for bidirectional data transmissions at speeds of 4.8 or 9.6 Kbps. See also <a href="v.html#REF20606"><i>V.32bis</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF20606"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>V.32bis</b></a><br> </font> <dl> <dd><font size="2" face="Arial">ITU-T standard that extends V.32 to speeds up to 14.4 Kbps. See also <a href="v.html#REF11472"><i>V.32</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>V.34</b><br> </font> <dl> <dd><font size="2" face="Arial">ITU-T standard that specifies a serial line protocol. V.34 offers improvements to the V.32 standard, including higher transmission rates (28.8 Kbps) and enhanced data compression. Compare with <a href="v.html#REF11472"><i>V.32</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>V.35</b><br> </font> <dl> <dd><font size="2" face="Arial">ITU-T standard describing a synchronous, physical layer protocol used for communications between a network access device and a packet network. V.35 is most commonly used in the United States and in Europe, and is recommended for speeds up to 48 Kbps.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF16814"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>V.42</b></a><br> </font> <dl> <dd><font size="2" face="Arial">ITU-T standard protocol for error correction using LAPM. See also <a href="l.html#REF31268"><i>LAPM</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>variable bit rate</b><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="v.html#REF34801"><i>VBR</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>variable-length subnet mask</b><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="v.html#REF15690"><i>VLSM</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF34801"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>VBR</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Variable bit rate</strong>. QOS class defined by the ATM Forum for ATM networks. VBR is subdivided into a real time (RT) class and non-real time (NRT) class. VBR (RT) is used for connections in which there is a fixed timing relationship between samples. VBR (NRT) is used for connections in which there is no fixed timing relationship between samples, but that still need a guaranteed QOS. Compare with <i><a href="a.html#REF22745">ABR</a> (available bit rate), <a href="c.html#REF35909">CBR</a></i>, and <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>VC</b><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="v.html#REF20904"><i>virtual circuit</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF25710"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>VCC</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Virtual channel connection</strong>. Logical circuit, made up of VCLs, that carries data between two end points in an ATM network. Sometimes called a <i>virtual circuit connection</i>. See also <a href="v.html#REF22540"><i>VCI</i></a>, <a href="v.html#REF37410"><i>VCL</i></a>, and <a href="v.html#REF18826"><i>VPI</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF22540"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>VCI</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Virtual channel identifier</strong>. 16-bit field in the header of an ATM cell. The VCI, together with the VPI, is used to identify the next destination of a cell as it passes through a series of ATM switches on its way to its destination. ATM switches use the VPI/VCI fields to identify the next network VCL that a cell needs to transit on its way to its final destination. The function of the VCI is similar to that of the DLCI in Frame Relay. Compare to <a href="d.html#REF22170"><i>DLCI</i></a>. See also <a href="v.html#REF37410"><i>VCL</i></a> and <a href="v.html#REF18826"><i>VPI</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF37410"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>VCL</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Virtual channel link</strong>. Connection between two ATM devices. A VCC is made up of one or more VCLs. See also <a href="v.html#REF25710"><i>VCC</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF19756"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>VCN</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Virtual circuit number</strong>. 12-bit field in an X.25 PLP header that identifies an X.25 virtual circuit. Allows DCE to determine how to route a packet through the X.25 network. Sometimes called<i> LCI (logical channel identifier) </i>or <i>LCN (logical channel number)</i>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>vector</b><br> </font> <dl> <dd><font size="2" face="Arial">Data segment of an SNA message. A vector consists of a length field, a key that describes the vector type, and vector-specific data.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>VERS</b><br> </font> <dl> <dd><font size="2" face="Arial">Version number field with in an IP datagram<br> .</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>Versatile Interface Processor</b><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="v.html#REF14635"><i>VIP</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="vertcab"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>vertical cabling</b></a><br> </font> <dl> <dd><font size="2" face="Arial">Backbone cabling. See <a href="b.html#bbonec"><i>backbone cabling</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF31096"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>VINES</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Virtual Integrated Network Service</strong>. NOS developed and marketed by Banyan Systems.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF14635"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>VIP</b></a><br> </font> <dl> <dd><font size="2" face="Arial">1.) <strong>Versatile Interface Processor</strong>. Interface card used in Cisco 7000 and Cisco 7500 series routers. The VIP provides multilayer switching and runs the Cisco IOS software. See also <a href="c.html#REF15423"><i>Cisco 7000</i></a> and <a href="c.html#REF33379"><i>Cisco 7500</i></a>.<br> 2.) <strong>Virtual IP</strong>. Function that enables the creation of logically separated switched IP workgroups across the switch ports of a Catalyst 5000 running Virtual Networking Services software. See also <a href="v.html#REF25500"><i>Virtual Networking Services</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>virtual address</b><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="n.html#REF28504"><i>network address</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>virtual channel</b><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="v.html#REF20904"><i>virtual circuit</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>virtual channel connection</b><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="v.html#REF25710"><i>VCC</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>virtual channel identifier</b><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="v.html#REF22540"><i>VCI</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>virtual channel link</b><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="v.html#REF37410"><i>VCL</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF20904"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>virtual circuit</b></a><br> </font> <dl> <dd><font size="2" face="Arial">Logical circuit created to ensure reliable communication between two network devices. 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