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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><a name="REF21500"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">E1</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of 2.048 Mbps. E1 lines can be leased for private use from common carriers. Compare with <a href="t.html#REF37233"><i>T1</i></a>. See also <a href="d.html#REF37635"><i>DS-1</i></a>.<br> </font></dd> </dl> <p><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">E.164</font></b><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">ITU-T recommendation for international telecommunication numbering, especially in ISDN, BISDN, and SMDS. An evolution of standard telephone numbers.<br> </font></dd> </dl> <p><a name="REF22781"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">E3</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of 34.368 Mbps. E3 lines can be leased for private use from common carriers. Compare with <a href="t.html#REF13187"><i>T3</i></a>. See also <a href="d.html#REF14051"><i>DS-3</i></a>.<br> </font></dd> </dl> <p><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">early token release</font></b><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">Technique used in Token Ring networks that allows a station to release a new token onto the ring immediately after transmitting, instead of waiting for the first frame to return. This feature can increase the total bandwidth on the ring. See also <a href="t.html#REF12464"><i>Token Ring</i></a>.<br> </font></dd> </dl> <p><a name="REF25908"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EARN</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><strong><font size="2" face="Arial">European Academic Research Network</font></strong><font size="2" face="Arial">. European network connecting universities and research institutes. EARN merged with RARE to form TERENA. See also <a href="r.html#REF14847"><i>RARE</i></a> and <a href="t.html#REF30407"><i>TERENA</i></a>.<br> </font></dd> </dl> <p><a name="REF29356"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EBCDIC</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><strong><font size="2" face="Arial">Extended binary coded decimal interchange code</font></strong><font size="2" face="Arial">. Any of a number of coded character sets developed by IBM consisting of 8-bit coded characters. This character code is used by older IBM systems and telex machines. Compare with <a href="a.html#REF39403"><i>ASCII</i></a>.<br> </font></dd> </dl> <p><a name="REF28784"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">ECC</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><strong><font size="2" face="Arial">Edge card control</font></strong><font size="2" face="Arial">. Process on the NP of a LightStream 2020 ATM switch that performs per-card processing for an edge card. Such processing includes protocol management (ATM connection management) and media-specific (Ethernet and FDDI) management tasks, internetworking operations such as packet forwarding and filtering, and network management tasks. See also <a href="e.html#REF16668"><i>edge card</i></a>, <a href="l.html#REF27758"><i>LCC</i></a>, and <a href="n.html#REF34385"><i>NP card</i></a>.<br> </font></dd> </dl> <p><a name="REF13125"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">E channel</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><strong><font size="2" face="Arial">Echo channel</font></strong><font size="2" face="Arial">. 64-kbps ISDN circuit-switching control channel. The E channel was defined in the 1984 ITU-T ISDN specification, but was dropped in the 1988 specification. Compare with <a href="b.html#REF30981"><i>B channel</i></a>, <a href="d.html#REF13664"><i>D channel</i></a>, and <a href="h.html#REF33937"><i>H channel</i></a>.<br> </font></dd> </dl> <p><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">echo channel</font></b><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="e.html#REF13125"><i>E channel</i></a>.<br> </font></dd> </dl> <p><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">echoplex</font></b><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">Mode in which keyboard characters are echoed on a terminal screen upon return of a signal from the other end of the line indicating that the characters were received correctly.<br> </font></dd> </dl> <p><a name="REF35157"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">ECMA</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><strong><font size="2" face="Arial">European Computer Manufacturers Association</font></strong><font size="2" face="Arial">. Group of European computer vendors who have done substantial OSI standardization work.<br> </font></dd> </dl> <p><a name="REF16668"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">edge card</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">Line card on the LightStream 2020 ATM switch that is configured to communicate with devices outside the ATM network. Edge cards offer Ethernet, FDDI, frame forwarding, Frame Relay, OC-3c, and UNI interfaces. See also <a href="t.html#REF31238"><i>trunk card</i></a>.<br> </font></dd> </dl> <p><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">edge card control</font></b><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">See <a href="e.html#REF28784"><i>ECC</i></a>.<br> </font></dd> </dl> <p><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">edge device</font></b><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">Network entity such as a LAN segment, host, or router that connects to a LightStream 2020 ATM switch via an edge card. Edge devices send and receive the data that passes through the ATM network.<br> </font></dd> </dl> <p><a name="REF22933"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EDI</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><strong><font size="2" face="Arial">Electronic data interchange</font></strong><font size="2" face="Arial">. The electronic communication of operational data such as orders and invoices between organizations.<br> </font></dd> </dl> <p><a name="REF39645"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EDIFACT</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><strong><font size="2" face="Arial">Electronic Data Interchange for Administration, Commerce, and Transport</font></strong><font size="2" face="Arial">. Data exchange standard administered by the United Nations to be a multi-industry EDI standard.<br> </font></dd> </dl> <p><a name="REF24343"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EEPROM</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><strong><font size="2" face="Arial">Electrically erasable programmable read-only memory</font></strong><font size="2" face="Arial">. EPROM that can be erased using electrical signals applied to specific pins. See also <a href="e.html#REF40747"><i>EPROM</i></a>.<br> </font></dd> </dl> <p><a name="REF19752"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EGP</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><strong><font size="2" face="Arial">Exterior Gateway Protocol</font></strong><font size="2" face="Arial">. Internet protocol for exchanging routing information between autonomous systems. Documented in RFC 904. Not to be confused with the general term <i>exterior gateway protocol</i>. EGP is an obsolete protocol that has been replaced by BGP. See also <a href="b.html#REF13487"><i>BGP</i></a>.<br> </font></dd> </dl> <p><a name="REF23184"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EIA</font></b></a><font size="2" face="Arial"><br> </font></p> <blockquote> <p><strong><font size="2" face="Arial">Electronic Industries Association</font></strong><font size="2" face="Arial">. Group that specifies electrical transmission standards. The EIA and TIA have developed numerous well-known communications standards, including EIA/TIA-232 and EIA/TIA-449. See also <a href="t.html#REF26847"><i>TIA</i></a>.<br> </font></p> </blockquote> <p><a name="REF42296"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EIA-530</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">REFers to two electrical implementations of EIA/TIA-449: RS-422 (for balanced transmission) and RS-423 (for unbalanced transmission). See also <a href="r.html#REF16492"><i>RS-422</i></a>, <a href="r.html#REF19503"><i>RS-423</i></a>, and <a href="e.html#REF35734"><i>EIA/TIA-449</i></a>.<br> </font></dd> </dl> <p><a name="REF35209"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EIA/TIA-232</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">Common physical layer interface standard, developed by EIA and TIA, that supports unbalanced circuits at signal speeds of up to 64 kbps. Closely resembles the V.24 specification. Formerly known as <i>RS-232</i>.<br> </font></dd> </dl> <p><a name="REF35734"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EIA/TIA-449</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">Popular physical layer interface developed by EIA and TIA. Essentially, a faster (up to 2 Mbps) version of EIA/TIA-232 capable of longer cable runs. Formerly called <i>RS-449</i>. See also <a href="e.html#REF42296"><i>EIA-530</i></a>.<br> </font></dd> </dl> <p><a name="REF41680"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b><font size="2" face="Arial">EIA/TIA-568</font></b></a><font size="2" face="Arial"><br> </font> <dl> <dd><font size="2" face="Arial">Standard that describes the characteristics and applications for various grades of UTP cabling. See also <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⌨️ 快捷键说明
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