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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="REF40509"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SAC</b></a><br> </font></p> <dl> <dd><font face="Arial" size="2"><strong>Single-attached concentrator</strong>. FDDI or CDDI concentrator that connects to the network by being cascaded from the master port of another FDDI or CDDI concentrator.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>safety ground wire</b><br> </font> <dl> <dd><font face="Arial" size="2">Circuit wire that connects to a local earth ground and the chassis of an electrical appliance or device via an electrical outlet and plug. It is used to ensure that no voltage potential exists between the chassis of the electrical device and the earth ground.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="sag"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>sag</b></a><br> </font> <dl> <dd><font face="Arial" size="2">Any decrease of below 80% in the normal voltage carried by a power line. A sag is sometimes referred to as a brownout. See <i><a href="s.html#surge">surge</a>, <a href="s.html#spike">spike</a>, and <a href="o.html#oscill">oscillation</a></i>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>sampling rate</b><br> </font> <dl> <dd><font face="Arial" size="2">Rate at which samples of a particular waveform amplitude are taken.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF42205"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SAP</b></a><br> </font> <dl> <dd><font face="Arial" size="2">1.) <strong>Service access point</strong>. Field defined by the IEEE 802.2 specification that is part of an address specification. Thus, the destination plus the DSAP define the recipient of a packet. The same applies to the SSAP. See also <a href="d.html#REF11761"><i>DSAP</i></a> and <a href="s.html#REF12300"><i>SSAP</i></a>.<br> 2.<i>) </i><strong>Service Advertisement Protocol</strong>. IPX protocol that provides a means of informing network clients, via routers and servers, of available network resources and services. See also <a href="i.html#REF16740"><i>IPX</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF19026"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SAR</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Segmentation and reassembly</strong>. One of the two sublayers of the AAL CPCS, responsible for dividing (at the source) and reassembling (at the destination) the PDUs passed from the CS. The SAR sublayer takes the PDUs processed by the CS and, after dividing them into 48-byte pieces of payload data, passes them to the ATM layer for further processing. See also <a href="a.html#REF21608"><i>AAL</i></a>, <a href="a.html#REF22960"><i>ATM layer</i></a>, <a href="c.html#REF37984"><i>CPCS</i></a>, <a href="c.html#REF31937"><i>CS</i></a>, and <a href="s.html#REF27066"><i>SSCS</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF16664"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SAS</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Single attachment station</strong>. Device attached only to the primary ring of an FDDI ring. Also known as a <i>Class B station</i>. Compare with <a href="d.html#REF12280"><i>DAS</i></a>. See also <a href="f.html#REF38987"><i>FDDI</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>satellite communication</b><br> </font> <dl> <dd><font face="Arial" size="2">Use of orbiting satellites to relay data between multiple earth-based stations. Satellite communications offer high bandwidth and a cost that is not related to distance between earth stations, long propagation delays, or broadcast capability.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SBus</b><br> </font> <dl> <dd><font face="Arial" size="2">Bus technology used in Sun SPARC-based workstations and servers. The SBus specification has been adopted by the IEEE as a new bus standard.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF23462"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SCR</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Sustainable cell rate</strong>. Parameter defined by the ATM Forum for ATM traffic management. For VBR connections, SCR determines the long-term average cell rate that can be transmitted. See also <a href="v.html#REF34801"><i>VBR</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF17306"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SCTE</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Serial clock transmit external</strong>. Timing signal that DTE echoes to DCE to maintain clocking. SCTE is designed to compensate for clock phase shift on long cables. When the DCE device uses SCTE instead of its internal clock to sample data from the DTE, it is better able to sample the data without error even if there is a phase shift in the cable. See also <a href="p.html#REF32108"><i>phase shift</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF17960"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SDH</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Synchronous Digital Hierarchy</strong>. European standard that defines a set of rate and format standards that are transmitted using optical signals over fiber. SDH is similar to SONET, with a basic SDH rate of 155.52 Mbps, designated at STM-1. See also <a href="s.html#REF10849"><i>SONET</i></a> and <a href="s.html#REF39326"><i>STM-1</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF24030"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SDLC</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Synchronous Data Link Control</strong>. SNA data link layer communications protocol. SDLC is a bit-oriented, full-duplex serial protocol that has spawned numerous similar protocols, including HDLC and LAPB. See also <a href="h.html#REF37169"><i>HDLC</i></a> and <a href="l.html#REF12763"><i>LAPB</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SDLC broadcast</b><br> </font> <dl> <dd><font face="Arial" size="2">Feature that allows a Cisco router that receives an all-stations broadcast on a virtual multidrop line to propagate the broadcast to each SDLC line that is a member of the virtual multidrop line.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF40950"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SDLC Transport</b></a><br> </font> <dl> <dd><font face="Arial" size="2">Cisco router feature with which disparate environments can be integrated into a single, high-speed, enterprise-wide network. Native SDLC traffic can be passed through point-to-point serial links with other protocol traffic multiplexed over the same links. Cisco routers can also encapsulate SDLC frames inside IP datagrams for transport over arbitrary (non-SDLC) networks. Replaces proxy polling. See also <a href="p.html#REF40474"><i>proxy polling</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SDLLC</b><br> </font> <dl> <dd><font face="Arial" size="2">Feature that performs translation between SDLC and IEEE 802.2 type 2.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SDSU</b><br> </font> <dl> <dd><font face="Arial" size="2"><strong>SMDS DSU</strong>. DSU for access to SMDS via HSSIs and other serial interfaces.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF11606"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SDU</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Service data unit</strong>. Unit of information from an upper-layer protocol that defines a service request to a lower-layer protocol.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF17933"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>SEAL</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Simple and efficient AAL</strong>. Scheme used by AAL5 in which the SAR sublayer segments CS PDUs without adding additional fields. See also <a href="a.html#REF21608"><i>AAL</i></a>, <a href="a.html#REF33256"><i>AAL5</i></a>, <a href="c.html#REF31937"><i>CS</i></a>, and <a href="s.html#REF19026"><i>SAR</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>secondary</b><br> </font> <dl> <dd><font face="Arial" size="2">See <a href="s.html#REF22468"><i>secondary station</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF29508"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>secondary ring</b></a><br> </font> <dl> <dd><font face="Arial" size="2">One of the two rings making up an FDDI or CDDI ring. The secondary ring is usually reserved for use in the event of a failure of the primary ring. Compare to <a href="p.html#REF42292"><i>primary ring</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF22468"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>secondary station</b></a><br> </font> <dl> <dd><font face="Arial" size="2">In bit-synchronous data link layer protocols such as HDLC, a station that responds to commands from a primary station. Sometimes referred to simply as a <i>secondary</i>. See also <a href="p.html#REF20041"><i>primary station</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF29406"><img border="0" src="../../images/bullet.gif" width="17" height="12"> <b>security management</b></a><br> </font> <dl> <dd><font face="Arial" size="2">One of five categories of network management defined by ISO for management of OSI networks. Security management subsystems are responsible for controlling access to network resources. See also <a href="a.html#REF19062"><i>accounting management</i></a>, <a href="c.html#REF29377"><i>configuration⌨️ 快捷键说明
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