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<html> <head> <meta content="en-us" http-equiv="Content-Language"> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> <link type="text/css" rel="stylesheet" href="../../../../../css/ccna.css"> <script src="../../../../../js/framesetHelper.js" language="JavaScript"></script><script language="JavaScript"> window.scrollTo(0,0); function newPage(pageID) { alert("COMMING SOON!!\nThis feature is currently in development."); } function launchMoreInfo(oid) { dash = oid.indexOf('-'); sub1 = oid.substring(0,dash); sub2 = oid.substring(dash+1); // this is an URL base on the // system that generated the static // download of the curriculum. httpref = "http://nomar.sdf.cisco.com/servlet/org.cli.delivery.rendering.servlet.MIServlet/Static=true,LMSID=DTUI,Engine=dynamic,Theme=cnamstheme,Style=ccna,Language=en,Version=2,RootID=knet-v214aCV47051/CHAPID=null/RLOID=null/RIOID=null/"; newref = httpref + sub1 +"/"+ sub2 +"/moreinfoframeset.html"; //alert("new newref :\n" + newref); window.open(newref,'MoreInfo','toolbar=no,status=yes,menubar=no,location=no,scrollbars=yes,height=442,width=756,left=20,top=20,resizable=yes') } function launchContentResource(contentID) { top.currentSupport = 0; 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Rather than delay the introduction of the topic, it is presented early so it can be used in various discussions of networking media and LAN technologies. The fundamental unit of bandwidth is a unit of information, such as a bit, per unit of time,such as a second, is the bit per second, a rate, a flow.</p> </span></td> </tr> </table> </td> </tr> </table> </td> </tr> </table><p>LANs and WANs have always had one thing in common, that is the use of the term bandwidth to describe their capabilities. This term is essential for understanding networks but can be confusing at first. We will take a detailed look at this concept before we get too far into networking. </p><p>Bandwidth is the measure of how much information can flow from one place to another in a given amount of time. There are two common uses of the word bandwidth: one deals with analog signals, and the other with digital signals. You will work with digital bandwidth, called simply bandwidth for the remainder of the text.</p><p>The most basic unit of information is the bit and the basic unit of time is the second. So if we are trying to describe the AMOUNT of information flow in a SPECIFIC period of time, we could use the units "bits per second" to describe this flow.</p><p> <i>Bits per second</i> is a unit of bandwidth. Of course, if communication happened at this rate, 1 bit per 1 second, it would be very slow. Imagine trying to send the ASCII code for your name and address - it would take minutes! Fortunately, much faster communications are now possible. The chart summarizes the various units of bandwidth.</p><table cellpadding="0" cellspacing="4" width="63%" border="0" xmlns:java="http://xml.apache.org/xslt/java"> <tr> <td valign="middle" width="8%"><img height="23" width="23" src="../../../../../images/ccna/common/icon2.gif"></td><td valign="middle" width="92%"><span class="cstitle">Web Links</span></td> </tr> <tr> <td valign="middle" width="8%"> </td><td valign="middle" width="92%"><span class="smtext"><a target="_blank" href="http://www.rad.com/networks/1995/digcom/digcom.htm">Digital Communications</a></span></td> </tr> </table></td> </tr> </table> </td> </tr></table> <p> </p> <table width="100%" cellspacing="0" cellpadding="2" border="0" valign="bottom"> <tr> <td></td> </tr> </table> </body></html>⌨️ 快捷键说明
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