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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"><font size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF37931"><font size="2"><b>failure domain</b></font></a></font></p> <dl> <dd><font size="2" face="Arial">Area in which a failure has occurred in a Token Ring, defined by the information contained in a beacon. When a station detects a serious problem with the network (such as a cable break), it sends a beacon frame that includes the station reporting the failure, its NAUN, and everything in between. Beaconing in turn initiates a process called autoreconfiguration. See also <a href="a.html#REF38778"><i>autoreconfiguration</i></a>, <a href="b.html#REF27381"><i>beacon</i></a>, and <a href="n.html#REF23527"><i>NAUN</i></a>.</font></dd> </dl> <p><font size="2" face="Arial"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>fan-out unit</b></font> <dl> <dd><font size="2" face="Arial">Device that allows multiple devices on a network to communicate using a single network attachment.</font></dd> </dl> <p><font size="2" face="Arial"><img border="0" src="../../images/bullet.gif" width="17" height="12"><a name="REF30424"><b>fantail</b></a></font> <dl> <dd><font size="2" face="Arial">Panel of I/O connectors that attaches to an equipment rack, providing easy access for data connections to a LightStream 2020 ATM switch. See also <a href="a.html#REF33348"><i>applique</i></a>.</font></dd> </dl> <p><font size="2" face="Arial"><img border="0" src="../../images/bullet.gif" width="17" height="12"><a name="REF35339"><b>Fast Ethernet</b></a></font> <dl> <dd><font size="2" face="Arial">Any of a number of 100-Mbps Ethernet specifications. Fast Ethernet offers a speed increase ten times that of the 10BASE-T Ethernet specification, while preserving such qualities as frame format, MAC mechanisms, and MTU. Such similarities allow the use of existing 10BASE-T applications and network management tools on Fast Ethernet networks. Based on an extension to the IEEE 802.3 specification. Compare with <a href="e.html#REF16746"><i>Ethernet</i></a>. See also <a href="nums.html#REF23235"><i>100BASE-FX</i></a>, <a href="nums.html#REF28491"><i>100BASE-T</i></a>, <a href="nums.html#REF26857"><i>100BASE-T4</i></a>, <a href="nums.html#REF29724"><i>100BASE-TX</i></a>, <a href="nums.html#REF34945"><i>100BASE-X</i></a>, and <a href="i.html#REF32637"><i>IEEE 802.3</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><b><font size="2" face="Arial">Fast Ethernet Interface Processor</font></b> <dl> <dd><font size="2" face="Arial">See <a href="f.html#REF12246"><i>FEIP</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><b><font size="2" face="Arial">Fast Sequenced Transport</font></b> <dl> <dd><font size="2" face="Arial">See <a href="f.html#REF13245"><i>FST</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><b><font size="2" face="Arial">Fast Serial Interface Processor</font></b> <dl> <dd><font size="2" face="Arial">See <a href="f.html#REF12319"><i>FSIP</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF39943"><b><font size="2" face="Arial">fast switching</font></b></a> <dl> <dd><font size="2" face="Arial">Cisco feature whereby a route cache is used to expedite packet switching through a router. Contrast with <a href="s.html#REF30856"><i>slow switching</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF10091"><b><font size="2" face="Arial">fault management</font></b></a> <dl> <dd><font size="2" face="Arial">One of five categories of network management defined by ISO for management of OSI networks. Fault management attempts to ensure that network faults are detected and controlled. See also <a href="a.html#REF19062"><i>accounting management</i></a>, <a href="c.html#REF29377"><i>configuration management</i></a>, <a href="p.html#REF16731"><i>performance management</i></a>, and <a href="s.html#REF29406"><i>security management</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF26477"><b><font size="2" face="Arial">FCC</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Federal Communications Commission</font></strong><font size="2">. U.S. government agency that supervises, licenses, and controls electronic and electromagnetic transmission standards.</font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF29200"><b><font size="2" face="Arial">fcload</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Function card load</font></strong><font size="2">. Low-level software module in the LightStream 2020 ATM switch that is invoked by higher-level modules to load software from the NP to a function card.</font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF25354"><b><font size="2" face="Arial">FCS</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Frame check sequence</font></strong><font size="2">. Refers to the extra characters added to a frame for error control purposes. Used in HDLC, Frame Relay, and other data link layer protocols.</font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF38987"><b><font size="2" face="Arial">FDDI</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Fiber Distributed Data Interface</font></strong><font size="2">. LAN standard, defined by ANSI X3T9.5, specifying a 100-Mbps token-passing network using fiber-optic cable, with transmission distances of up to 2 km. FDDI uses a dual-ring architecture to provide redundancy. Compare with <a href="c.html#REF42376"><i>CDDI</i></a> and <a href="f.html#REF40409"><i>FDDI II</i></a>.</font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF40409"><b><font size="2" face="Arial">FDDI II</font></b></a> <dl> <dd><font size="2" face="Arial">ANSI standard that enhances FDDI. FDDI II provides isochronous transmission for connectionless data circuits and connection-oriented voice and video circuits. Compare with <a href="f.html#REF38987"><i>FDDI</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><b><font size="2" face="Arial">FDDI Interface Processor</font></b> <dl> <dd><font size="2" face="Arial">See <a href="f.html#REF19817"><i>FIP</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF27029"><b><font size="2" face="Arial">FDM</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Frequency-division multiplexing</font></strong><font size="2">. Technique whereby information from multiple channels can be allocated bandwidth on a single wire based on frequency. Compare with <a href="a.html#REF40304"><i>ATDM</i></a>, <a href="s.html#REF33995"><i>statistical multiplexing</i></a>, and <a href="t.html#REF10889"><i>TDM</i></a>.</font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF33053"><b><font size="2" face="Arial">FECN</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Forward explicit congestion notification</font></strong><font size="2">. Bit set by a Frame Relay network to inform DTE receiving the frame that congestion was experienced in the path from source to destination. DTE receiving frames with the FECN bit set can request that higher-level protocols take flow-control action as appropriate. Compare with <a href="b.html#REF12789"><i>BECN</i></a>.</font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><b><font size="2" face="Arial">Federal Communications Commission</font></b> <dl> <dd><font size="2" face="Arial">See <a href="f.html#REF26477"><i>FCC</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><b><font size="2" face="Arial">Federal Networking Council</font></b> <dl> <dd><font size="2" face="Arial">See <a href="f.html#REF15210"><i>FNC</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF12246"><b><font size="2" face="Arial">FEIP</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Fast Ethernet Interface Processor</font></strong><font size="2">. Interface processor on the Cisco 7000 series routers. The FEIP supports up to two 100-Mbps 100BASE-T ports.</font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF14115"><b><font size="2" face="Arial">FEP</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Front-end processor</font></strong><font size="2">. Device or board that provides network interface capabilities for a networked device. In SNA, typically an IBM 3745 device.</font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><b><font size="2" face="Arial">FF</font></b> <dl> <dd><font size="2" face="Arial">See <a href="f.html#REF13169"><i>frame forwarding</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><b><font size="2" face="Arial">Fiber Distributed Data Interface</font></b> <dl> <dd><font size="2" face="Arial">See <a href="f.html#REF38987"><i>FDDI</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF39151"><b><font size="2" face="Arial">fiber-optic cable</font></b></a> <dl> <dd><font size="2" face="Arial">Physical medium capable of conducting modulated light transmission. Compared with other transmission media, fiber-optic cable is more expensive, but is not susceptible to electromagnetic interference, and is capable of higher data rates. Sometimes called <i>optical fiber</i>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><b><font size="2" face="Arial">fiber-optic interrepeater link</font></b> <dl> <dd><font size="2" face="Arial">See <a href="f.html#REF29259"><i>FOIRL</i></a>.</font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF30959"><b><font size="2" face="Arial">FID0</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Format indicator 0</font></strong><font size="2">. One of several formats that an SNA TH can use. An FID0 TH is used for communication between an SNA node and a non-SNA node. See also <a href="t.html#REF22292"><i>TH</i></a>.</font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF36857"><b><font size="2" face="Arial">FID1</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Format indicator 1</font></strong><font size="2">. One of several formats that an SNA TH can use. An FID1 TH encapsulates messages between two subarea nodes that do not support virtual and explicit routes. See also <a href="t.html#REF22292"><i>TH</i></a>.</font></font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"></font><a name="REF31842"><b><font size="2" face="Arial">FID2</font></b></a> <dl> <dd><font face="Arial"><strong><font size="2">Format indicator 2</font></strong><font size="2">. One of several formats that an SNA TH can use. An FID2 TH is used⌨️ 快捷键说明
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