<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>The length limits are to ensure a collision is detected on a half duplex network if two distant nodes send the smallest allowed packet at exactly the same time. </div><div><br></div><div>When you have a full duplex switched network (no coax, repeaters or hubs) the lengths are no longer critical. Then it's down to the electrical characteristics of the cable and getting the bits from TX to RX reliably. </div><div><br><div>John Lindsay</div></div><div><br>On 5 Mar 2014, at 8:51 am, "Beeson, Ayden" <<a href="mailto:ABeeson@csu.edu.au">ABeeson@csu.edu.au</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta name="Generator" content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">IIRC the standard maximum channel length is 100m, but they allow for up to 5m patch leads on each end, hence the 90m permanent link limit.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks,<o:p></o:p></span></p><p class="MsoNormal"><b><span style="font-family:"Arial","sans-serif";color:#333333">Ayden Beeson</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> AusNOG [<a href="mailto:ausnog-bounces@lists.ausnog.net">mailto:ausnog-bounces@lists.ausnog.net</a>] <b>On Behalf Of </b>David Beveridge<br><b>Sent:</b> Wednesday, 5 March 2014 9:12 AM<br><b>To:</b> Steve Smalley<br><b>Cc:</b> <a href="mailto:ausnog@lists.ausnog.net">ausnog@lists.ausnog.net</a><br><b>Subject:</b> Re: [AusNOG] Cable length limits?<o:p></o:p></span></p><p class="MsoNormal"><o:p> </o:p></p><div><p class="MsoNormal"><o:p> </o:p></p><div><p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p><div><p class="MsoNormal">On Tue, Mar 4, 2014 at 9:37 PM, Steve Smalley <<a href="mailto:SSmalley@trimblenetworks.com.au" target="_blank">SSmalley@trimblenetworks.com.au</a>> wrote:<o:p></o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt">Back when I was learning the ropes I recall being told something similar... 100m limit for cat5 (I don't think c5e was around at the time). And due to this I tend to stick to it but can't for the sake of me remember exactly who what where when or why.<o:p></o:p></p><div><p class="MsoNormal">Hmm, My recollection is 300ft, which works out to just 91.44 meters. <o:p></o:p></p></div></div></div></div></div>
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